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Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Typical units
FEATURES
n Standard quarter-brick package/pinout n cost; Low profile, 0.4" (10.2mm) Low n or 48V nominal input 24V n Outputs: 1.2V to 12V n Interleaved synchronous-rectifier topology * Ultra high efficiency * No output reverse conduction n Outstanding thermal performance n On/off control, trim & sense functions n isolated, 2250Vdc (BASIC) Fully n Output overvoltage protection n I/O protected; Thermal shutdown Fully n Designed to meet UL/EN/IEC60950-1 safety approvals n Qual/HALT/EMI tested
+VIN (3)
PRODUCT OVERVIEW
For applications requiring improved electrical and thermal performance at reduced cost, consider DATEL's new UCQ series "quarter brick" DC/DC power converters. These compact units measure just 1.45" x 2.3" x 0.4" (36.8 x 60.9 x 10.2 mm) and fit the industry-standard footprint. Available outputs range between 1.2V @ 30 Amps to 12V @ 8.3 Amps and accept a wide input range. The UCQ's interleaved, synchronous-rectifier topology offers high efficiency (up to 93%), tight line and load regulation, low noise and fast step response. A single-board optimized open-frame design contributes to impressive thermal operation. UCQ's will operate up to +70C and 100 LFM airflow with no derating. The UCQ's feature full isolation to 2250Vdc meeting BASIC insulation requirements of UL/EN/IEC 60950-1. Input filters reduce propagated switching noise back to input sources. Also included is a remote On/Off switch control (with positive or negative polarity), output trim adjustable over nominal and output sense functions to reduce power lead losses. Extensive protection items avoid damage from out of limit voltages, currents and temperatures. Protection faults automatically recover using the hiccup technique. Besides safety testing to 60950-1, certifications for the UCQ include application for EMC compliance (to FCC class B), qualification testing (including HALT) and CE marking.
+SENSE (7) +VOUT (8)
SWITCH CONTROL -VOUT (4)
-VIN (1)
-SENSE (5) PWM CONTROLLER OPTO ISOLATION REFERENCE & ERROR AMP
VOUT TRIM (6)
REMOTE ON/OFF CONTROL* (2)
INPUT UNDERVOLTAGE, INPUT OVERVOLTAGE, AND OUTPUT OVERVOLTAGE COMPARATORS
* Can be ordered with positive (standard) or negative (optional) polarity.
Typical topology may vary between units. Figure 1. Simplified Schematic
For full details go to www.murata-ps.com/rohs
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MDC_UCQ Models.B07 Page 1 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Performance Specifications and Ordering Guide
ORDERING GUIDE Output R/N (mVp-p) Root Models UCQ-1.2/40-D24P-C UCQ-1.2/30-D48N-C UCQ-1.5/25-D48N-C UCQ-1.5/40-D48N-C UCQ-1.8/30-D48N-C UCQ-2.5/40-D24P-C UCQ-2.5/30-D48N-C UCQ-3.3/35-D24P-C UCQ-3.3/20-D48N-C UCQ-3.3/30-D48N-C UCQ-5/20-D24P-C UCQ-5/20-D48N-C UCQ-5/25-D48N-C UCQ-8/12-D24P-C UCQ-12/8.3-D48N-C UCQ-15/6.7-D24P-C Vout Iout Power (Volts) (Amps) (Watts) Typ. Max. Regulation (Max.) Line Load Vin Nom. (Volts) Range (Volts) Iin no load (mA) Input Iin full load (Amps) Efficiency Min. Typ.
1.2 1.2 1.5 1.5 1.8 2.5 2.5 3.3 3.3 3.3 5 5 5 8 12 15
40 30 25 40 30 40 30 35 20 30 20 20 25 12 8.3 6.7
48 36 37.5 60 54 100 75 115.5 66 99 100 100 125 96 99.6 100.5
50 50 50 100 80 50 30 50 50 50 35
100 80 100 TBD 120 100 50 80 80 60 55
Please contact Murata Power Solutions for further information. 0.125% 0.25% 48 36-75 30 0.90 0.125% 0.25% 48 36-75 50 0.94 0.125% 0.25% 48 36-75 50 1.45 0.125% 0.25% 48 36-75 45 1.31 0.125% 0.25% 24 18-36 120 4.96 0.2% 0.25% 48 36-75 50 1.80 0.125% 0.25% 24 18-36 130 5.41 0.125% 0.25% 48 36-75 50 1.53 0.2% 0.25% 48 36-75 50 2.3 0.125% 0.25% 24 18-36 160 4.55 0.125% 0.25% 48 36-75 80 2.24 Please contact Murata Power Solutions for further information.
81% 81% 85% 83% 82% 85% 87% 88.5% 90% 88% 89%
83% 83% 86% 86% 84% 87% 89% 90% 91% 91.5% 93%
100
150
0.2% 0.25% 48 36-75 80 2.28 Please contact Murata Power Solutions for further information.
90%
91%
Please refer to the part number structure for additional ordering part numbers and options. All specifications are at nominal line voltage and full load, +25 deg.C unless otherwise noted. See detailed specifications. Output capacitors are 1 F ceramic || 10 F electrolytic. I/O caps are necessary for our test equipment and may not be needed for your application. Outline dimensions: 2.3 x 1.45 x 0.39 inches 58.4 x 36.8 x 9.9 mm Pinout: P32 (all models)
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MDC_UCQ Models.B07 Page 2 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
PART NUMBER STRUCTURE
Output Configuration: Unipolar, single output
U CQ - 3.3 / 35 - D48 N B
H -C
RoHS Hazardous Materials compliance
C = RoHS-6 (no lead), standard Y = RoHS-5 (with lead), optional, special order
Quarter-Brick Package Nominal Output Voltage Maximum Rated Output : Current in Amps Input Voltage Range: D24 = 18-36 Volts (24V nominal) D48 = 36-75 Volts (48V nominal) Conformal coating (optional) Blank = no coating, standard H = coating added, optional special order Baseplate (optional) Blank = No baseplate, standard B = Baseplate installed, optional special order On/Off Control Polarity P = Positive polarity (standard for D24, optional for D48) N = Negative polarity (standard for D48, optional for D24)
Note: Some model combinations may not be available. Contact Murata Power Solutions for availability.
MECHANICAL SPECIFICATIONS
0.40 (10.2)
UCQ with Optional Baseplate
2.30 (58.4) A
2.30 (58.4) B B 1.860 (47.2)
A A
1.45 (36.8)
1.03 (26.2)
0.18 (4.6)
PINS 1-3, 5-7: 0.040O 0.001 (1.016 0.025) PINS 4, 8: 0.060O 0.001 (1.524 0.025)
0.015 minimum clearance between standoffs and highest component A B
#M3 THD. X 0.15 DEEP TYPICAL 4 PL. SCREW LENGTH MUST NOT GO THROUGH BASEPLATE
2.00 (50.8)
B
1 2 3
4 1.45 (36.8) 5 6 7 8
B
0.50 (12.7)
0.600 (15.2)
Case C67
BOTTOM VIEW
0.300 (7.6)
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
0.600 (15.24) 4 EQ. SP. @ 0.150 (3.81)
0.18 (4.6)
PINS 1-3, 5-7: 0.040O 0.001 (1.016 0.025) PINS 4, 8: 0.060O 0.001 (1.524 0.025)
Component locations may vary between units.
I/O Connections
Tolerances (unless otherwise specified): .XX 0.02 (0.5) .XXX 0.010 (0.25) Angles 2 Components are shown for reference only.
Pin 1 2 3 4
Function P32 -Input Remote On/Off +Input -Output
Pin 5 6 7 8
Function P32 -Sense Output Trim +Sense +Output
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MDC_UCQ Models.B07 Page 3 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Performance Specifications and Ordering Guide
UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 Input Input voltage range Start-up threshold, Volts Undervoltage shutdown, V Overvoltage shutdown Reflected (back) ripple current, mA pk-pk Input Current Full load conditions Inrush transient, A2sec Output short circuit, mA No load, mA Low line (Vin = min.), Amps Standby mode, mA (Off, UV, OT shutdown) Internal input filter type Reverse polarity protection Remote On/Off Control Positive logic (P model suffix) Negative logic (N model suffix) Current, mA Output Voltage output range Voltage output accuracy Adjustment range, % of Vnom. Temperature coefficient Minimum loading Remote sense compensation Ripple/noise (20 MHz bandwidth) Line/Load regulation Efficiency Maximum capacitive loading, F low ESR <0.02 max., resistive load 1,000 10,000 max. 10,000 10% -20 + 10 10% See ordering guide. 1% of Vnom., (50% load) 10% 0.02% of Vout range per C No minimum loading. +10% See ordering guide. See ordering guide. See ordering guide. 4,700 10,000 10,000 max. 10,000 -20 + 10 -20 + 10 10% OFF = Ground pin to +0.8V ON = Open or +3.5 to +13.5V max OFF = Open or +3.5 to +13.5V ON = Ground pin to +1V max 1 Pi-type L-C Pi-type 1.23 1.26 1.96 See ordering guide. 0.05 50-200, model dependent 30-160, model dependent 1.74 1-10, model dependent Pi-type See notes. L-C L-C L-C 6.69 2.39 7.21 34 33 34 32 34 32.5 See ordering guide. 34 32.5 none 10-30, model dependent 16.8 15 34 32 17 15
Specs are typical unless noted.
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MDC_UCQ Models.B07 Page 4 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Performance Specifications and Ordering Guide
UCQ-3.3/20-D48 UCQ-3.3/30-D48 Input Input voltage range Start-up threshold, Volts Undervoltage shutdown, V Overvoltage shutdown Reflected (back) ripple current, mA pk-pk Input Current Full load conditions Inrush transient, A2sec Output short circuit, mA No load, mA Low line (Vin = min.), Amps Standby mode, mA (Off, UV, OT shutdown) Internal input filter type Reverse polarity protection Remote On/Off Control Positive logic (P model suffix) Negative logic (N model suffix) Current, mA Output Voltage output range Voltage output accuracy Adjustment range, % of Vnom. Temperature coefficient Minimum loading Remote sense compensation Ripple/noise (20 MHz bandwidth) Line/Load regulation Efficiency Maximum capacitive loading, F low ESR <0.02 max., resistive load 10,000 10,000 See ordering guide. 1% of Vnom., (50% load) -10 to + 10% 0.02% of Vout range per C. No minimum loading. +10% See ordering guide. See ordering guide. See ordering guide. 10,000 10,000 10,000 OFF = Ground pin to +0.8V ON = Open or +3.5 to +13.5V max OFF = Open or +3.5 to +13.5V ON = Ground pin to +1V max 1 L-C L-C 2.04 3.05 See ordering guide. 0.05 50-200, model dependent 30-160, model dependent 6.04 1-10, model dependent L-C See notes. L-C L-C 3.02 3.04 35 34 35 34 See ordering guide 17 16 none 10-30, model dependent. 35 34 35 34 UCQ-5/20-D24 UCQ-5/20-D48 UCQ-12/8.3-D48
Specs are typical unless noted.
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MDC_UCQ Models.B07 Page 5 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Performance Specifications and Ordering Guide
UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 Isolation Voltage Input to Output, Volts min. Input to baseplate, Volts min. Baseplate to output, Volts min. Isolation resistance, M Isolation capacitance, pF Isolation safety rating Miscellaneous Current limit inception (98% of Vout, after warmup), Amps Short circuit protection method Short circuit current, Amps Short circuit duration Overvoltage protection, Volts (via magnetic feedback) Dynamic characteristics Dynamic load response 200 Sec to 1% 200 Sec to 1% 50 Sec to 1% of 100 Sec to 1% 200 Sec to 1% 200 Sec to 1% 100 Sec to 1% (50-75-50% load step) of final value of final value final value of final value of final value of final value of final value Start-up time Vin to Vout regulated, mSec Remote On/Off to Vout regulated, mSec Switching frequency, KHz Environmental Calculated MTBF Operating temperature range See Derating curves. Operating case temperature, C" (no derating) Storage temperature range, C Thermal protection/ shutdown, C Relative humidity -40 to +110 TBD 2.2M hours -40 to +85, with derating TBD 50 50 350 20 50 50 440 40 50 50 400 40 50 50 400 50 50 480 50 50 450 30 2 3 350 10 1.8 1.8 35 35 49 36 46 37 45 2250 1500 1500 10-100, model dependent 1000 Basic insulation
Current limiting, hiccup autorestart. Remove overload for recovery. 5 Continuous, output shorted to ground. No damage. 1.95 2.7 V max 2.95 2.95 4
-40 to +120 -55 to +125 110-125, model dependent To +85C/85%, non-condensing
-40 to +110
Specs are typical unless noted.
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MDC_UCQ Models.B07 Page 6 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Performance Specifications and Ordering Guide
UCQ-3.3/20-D48 UCQ-3.3/30-D48 Isolation Voltage Input to Output, Volts min. Input to baseplate, Volts min. Baseplate to output, Volts min. Isolation resistance, M Isolation capacitance, pF Isolation safety rating Current limit inception (98% of Vout, after warmup), Amps Short circuit protection method Short circuit current, Amps Short circuit duration Overvoltage protection, Volts (via magnetic feedback) Dynamic characteristics Dynamic load response 200 Sec to 1% 200 Sec to 1% 200 Sec to 1% 200 Sec to 1% 200 Sec to 1% (50-75-50% load step) of final value of final value of final value of final value of final value Start-up time Vin to Vout regulated, mSec Remote On/Off to Vout regulated, mSec Switching frequency, KHz Environmental Calculated MTBF Operating temperature range See Derating curves. Operating case temperature, C" (no derating) Storage temperature range, C Thermal protection/ shutdown, C Relative humidity TBD -40 to +85, with derating 50 50 330 40 50 max. 50 max. 330 40 4 4 400 24 10 max. 10 max. 315 30 50 50 330 40 4.6 max. 24 min. 33 min. 2250 1500 1500 10-100, model dependent 1000 Basic insulation 26 22 min. 10 UCQ-5/20-D24 UCQ-5/20-D48 UCQ-12/8.3-D48
Current limiting, hiccup autorestart. Remove overload for recovery. 5 Continuous, output shorted to ground. No damage. 4 max. 6.25 TBD 14.4
-40 to +110 -55 to +125 110-125, model dependent To +85C/85%, non-condensing
Specs are typical unless noted.
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MDC_UCQ Models.B07 Page 7 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Performance Specifications and Ordering Guide
UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24 Physical Outline dimensions Pin material Pin diameter Pin finish Weight, ounces Weight, grams Electromagnetic interference Safety 1.06 30 1.06 30 See mechanical specs. Copper alloy 0.04/0.062 inches (1.016/1.524 mm) Nickel underplate with gold overplate 0.9 25 0.9 25 1.06 30 1.06 30 1.02 29
FCC part 15, class B, EN55022 (Conducted and radiated. External filter required) UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
UCQ-3.3/20-D48 UCQ-3.3/30-D48 Physical Outline dimensions Pin material Pin diameter Pin finish Weight, ounces Weight, grams Electromagnetic interference Safety 0.7 20
UCQ-5/20-D24
UCQ-5/20-D48
UCQ-12/8.3-D48
See mechanical specs. Copper alloy 0.04/0.062 inches (1.016/1.524 mm) Nickel underplate with gold overplate TBD TBD 1.06 30 TBD TBD 1.13 32
FCC part 15, class B, EN55022 (Conducted and radiated. External filter required) UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
Caution: This product is not internally fused. To comply with safety agency certifications and to avoid injury to personnel or equipment, the user must supply an external fast-blow fuse to the input terminals. See fuse information.
Specification Notes
(1) All models are tested and specified with external 1||10 F ceramic/tantalum output capacitors no external input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test equipment and may not be required to achieve specified performance in your applications. All models are stable and regulate within spec under no-load conditions. All specifications are typical unless noted. General conditions for Specifications are +25 deg.C, Vin and Vout = nominal, full load. Adequate airflow must be supplied for extended testing under power. (2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin = 33 F, 100V tantalum, Cbus = 220 F, 100V electrolytic, Lbus = 12 H. (3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves are presented at sea level altitude. Be aware of reduced power dissipation with increasing density altitude. (4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed conditions, Tpcboard = +25 deg.C, full output load, natural air convection. (5) The On/Off Control is normally controlled by a switch or open collector or open drain transistor. But it may also be driven with external logic or by applying appropriate external voltages which are referenced to Input Common. (6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. (7) The outputs are not intended to sink appreciable reverse current. This may damage the outputs. (8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduction. (9) All models are fully operational and meet published specifications, including "cold start" at -40 C. (10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) Output accuracy is dependent on user-supplied trim resistors. To achieve high accuracy, use 1% or better tolerance metal-film resistors mounted close to the converter. (12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is removed, the converter will immediately recover. (13) Do not exceed maximum power specifications when adjusting the output trim. (14) At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load. (15) Input Fusing: If reverse polarity is accidentally applied to the input, a body diode will become forward biased and will conduct considerable current. To ensure reverse input protection with full output load, always connect an external input fast-blow fuse in series with the +Vin input. Use approximately twice the full input current rating with nominal input voltage. (16) "Hiccup" overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation.
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MDC_UCQ Models.B07 Page 8 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Absolute Maximum Ratings
Input Voltage Continuous Transient (100msec) On/Off Control Input Reverse Polarity Protection Output Overvoltage Output Current Operating Temperature Storage Temperature Lead Temperature (soldering 10 sec. max.)
24V Models 0 to +36 Volts +50 Volts
48V Models 0 to +75 Volts +100 Volts
0V min. to +13.5V max. See Fuse section TBD Current-limited. Devices can withstand sustained short circuit without damage. -40 to +100C -55 to +125C +280C
The On/Off Control to VOUT start-up time assumes the converter has its nominal input voltage applied but is turned off via the On/Off Control pin. The specification defines the interval between the point at which the converter is turned on (released) and the fully loaded output voltage enters and remains within its specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off Control to VOUT start-up time is also governed by the internal soft start circuitry and external load capacitance. The difference in start up time from VIN to VOUT and from On/Off Control to VOUT is therefore insignificant. Input Source Impedance The input of UCQ converters must be driven from a low ac-impedance source. The DC/DC's performance and stability can be compromised by the use of highly inductive source impedances. The input circuit shown in Figure 2 is a practical solution that can be used to minimize the effects of inductance in the input traces. For optimum performance, components should be mounted close to the DC/DC converter. I/O Filtering, Input Ripple Current, and Output Noise All models in the UCQ Series are tested/specified for input reflected ripple current and output noise using the specified external input/output components/circuits and layout as shown in the following two figures. External input capacitors (CIN in Figure 2) serve primarily as energy-storage elements, minimizing line voltage variations caused by transient IR drops in conductors from backplane to the DC/DC. Input caps should be selected for bulk capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The switching nature of DC/DC converters requires that dc voltage sources have low ac impedance as highly inductive source impedance can affect system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your specific system configuration may necessitate additional considerations.
TO OSCILLOSCOPE
These are stress ratings. Exposure of devices to any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied, nor recommended.
Input Fusing Certain applications and/or safety agencies may require the installation of fuses at the inputs of power conversion components. Fuses should also be used if the possibility of sustained, non-current-limited, input-voltage polarity reversals exists. For DATEL UCQ series DC/DC converters, we recommend the use of a time delay fuse, installed in the ungrounded input supply line. As a rule of thumb however, we recommend the use of a normal-blow or slow-blow fuse with a typical value about twice the maximum input current, calculated at low line with the converter's minimum efficiency. All relevant national and international safety standards and regulations must be observed by the installer. For system safety agency approvals, the converters must be installed in compliance with the requirements of the end- use safety standard, i.e. IEC/EN/UL60950-1. Input Reverse-Polarity Protection If the input voltage polarity is accidentally reversed, an internal diode will become forward biased and likely draw excessive current from the power source. If this source is not current limited or the circuit appropriately fused, it could cause permanent damage to the converter. Input Under-Voltage Shutdown and Start-Up Threshold Under normal start-up conditions, devices will not begin to regulate properly until the ramping-up input voltage exceeds the Start-Up Threshold Voltage. Once operating, devices will not turn off until the input voltage drops below the Under-Voltage Shutdown limit. Subsequent re-start will not occur until the input is brought back up to the Start-Up Threshold. This built in hysteresis prevents any unstable on/off situations from occurring at a single input voltage. Start-Up Time The VIN to VOUT Start-Up Time is the time interval between the point at which the ramping input voltage crosses the Start-Up Threshold and the fully loaded output voltage enters and remains within its specified accuracy band. Actual measured times will vary with input source impedance, external input capacitance, and the slew rate and final value of the input voltage as it appears at the converter. The UCQ Series implements a soft start circuit to limit the duty cycle of its PWM controller at power up, thereby limiting the input inrush current.
CURRENT PROBE LBUS
3
+INPUT
+ VIN - CBUS
CIN 1
-INPUT
CIN = 33F, ESR < 700m @ 100kHz CBUS = 220F, ESR < 100m @ 100kHz LBUS = 12H
Figure 2. Measuring Input Ripple Current
In critical applications, output ripple/noise (also referred to as periodic and random deviations or PARD) may be reduced below specified limits using filtering techniques, the simplest of which is the installation of additional external output capacitors. They function as true filter elements and should be selected for bulk capacitance, low ESR and appropriate frequency response. All external capacitors should have appropriate voltage ratings and be located as close to the converter as possible. Temperature variations for all relevant parameters should also be taken carefully into consideration. The most effective combination of external I/O capacitors will be a function of line voltage and source impedance, as well as particular load and layout conditions.
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MDC_UCQ Models.B07 Page 9 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
In Figure 3, the two copper strips simulate real-world PCB impedances between the power supply and its load. In order to minimize measurement errors, scope measurements should be made using BNC connectors, or the probe ground should be less than 1/2 inch and soldered directly to the fixture.
7 8 COPPER STRIP
commonly referred to as power limiting. Current limit inception is defined as the point at which the full-power output voltage falls below the specified tolerance. See Performance/Functional Specifications. If the load current, being drawn from the converter, is significant enough, the unit will go into a short circuit condition as described below. Short Circuit Condition When a converter is in current-limit mode, the output voltage will drop as the output current demand increases. If the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period, the PWM will restart causing the output voltage to begin ramping to their appropriate value. If the short-circuit condition persists, another shutdown cycle will be initiated. This on/off cycling is referred to as "hiccup" mode. The hiccup cycling reduces the average output current, thereby preventing internal temperatures from rising to excessive levels. The UCQ Series is capable of enduring an indefinite short circuit output condition. Remote Sense Note: The Sense and VOUT lines are internally connected through low-value resistors. Nevertheless, if the sense function is not used for remote regulation the user should connect the +Sense to +VOUT and -Sense to -VOUT at the DC/ DC converter pins. UCQ series converters employ a sense feature to provide point of use regulation, thereby overcoming moderate IR drops in PCB conductors or cabling. The remote sense lines carry very little current and therefore require minimal cross-sectional-area conductors. The sense lines, which are capacitively coupled to their respective output lines, are used by the feedback control-loop to regulate the output. As such, they are not low impedance points and must be treated with care in layouts and cabling. Sense lines on a PCB should be run adjacent to dc signals, preferably ground. [VOUT(+)-VOUT(-)] - [Sense(+)-Sense(-)] 10%VOUT
+SENSE +OUTPUT
C1 4 5
C2
SCOPE
RLOAD
-OUTPUT -SENSE
COPPER STRIP
C1 = 1F CERAMIC C2 = 10F TANTALUM LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple/Noise (PARD)
Floating Outputs Since these are isolated DC/DC converters, their outputs are "floating" with respect to their input. Designers will normally use the -Output (pin 4) as the ground/return of the load circuit. You can however, use the +Output (pin 8) as ground/return to effectively reverse the output polarity. Minimum Output Loading Requirements UCQ converters employ a synchronous-rectifier design topology and all models regulate within spec and are stable under no-load to full load conditions. Operation under no-load conditions however might slightly increase the output ripple and noise. Thermal Shutdown The UCQ converters are equipped with thermal-shutdown circuitry. If environmental conditions cause the temperature of the DC/DC converter to rise above the designed operating temperature, a precision temperature sensor will power down the unit. When the internal temperature decreases below the threshold of the temperature sensor, the unit will self start. See Performance/Functional Specifications. Output Over-Voltage Protection The UCQ output voltage is monitored for an over-voltage condition using a comparator. The signal is optically coupled to the primary side and if the output voltage rises to a level which could be damaging to the load, the sensing circuitry will power down the PWM controller causing the output voltage to decrease. Following a time-out period the PWM will restart, causing the output voltage to ramp to its appropriate value. If the fault condition persists, and the output voltage again climbs to excessive levels, the over-voltage circuitry will initiate another shutdown cycle. This on/off cycling is referred to as "hiccup" mode. Current Limiting As soon as the output current increases to approximately 130% of its rated value, the DC/DC converter will go into a current-limiting mode. In this condition, the output voltage will decrease proportionately with increases in output current, thereby maintaining somewhat constant power dissipation. This is
Figure 4. Remote Sense Circuit Configuration
In cables and discrete wiring applications, twisted pair or other techniques should be used. Output over-voltage protection is monitored at the output voltage pin, not the Sense pin. Therefore, excessive voltage differences between VOUT and Sense in conjunction with trim adjustment of the output voltage can
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MDC_UCQ Models.B07 Page 10 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
cause the over-voltage protection circuitry to activate (see Performance Specifications for over-voltage limits). Power derating is based on maximum output current and voltage at the converter's output pins. Use of trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the converter's specified rating, or cause output voltages to climb into the output over-voltage region. Therefore, the designer must ensure: (VOUT at pins) x (IOUT) rated output power Trimming Output Voltage UCQ converters have a trim capability (pin 6) that enables users to adjust the output voltage (refer to the trim equations and trim graphs that follow). Adjustments to the output voltage can be accomplished via a trim pot (Figure 5) or a single fixed resistor as shown in Figures 6 and 7. A single fixed resistor can increase or decrease the output voltage depending on its connection. Resistors should be located close to the converter and have TCR's less than 100ppm/C to minimize sensitivity to changes in temperature. If the trim function is not used, leave the trim pin open.
Figure 7. Trim Connections To Decrease Output Voltages Using Fixed Resistors
A single resistor connected from the Trim pin (pin 6) to the +Sense (pin 7) will increase the output voltage. A resistor connected from the Trim Pin (pin 6) to the -Sense (pin 5) will decrease the output voltage.
(For all models except the UCQ-1.2/40-D24 and -1.2/30-D48) Trim Down Connect trim resistor between trim pin and -Sense RTrimDn (k ) = 5.11 - 10.22 Trim Up Connect trim resistor between trim pin and +Sense RTrimUp (k ) = 5.11 x VNOM x (1+ - 5.11 - 10.22 1.225 x
Trim Equations
Where, VNOM - VOUT) / VNOM VNOM is the nominal, untrimmed output voltage. VOUT is the desired new output voltage.
Figure 5. Trim Connections Using A Trimpot
Do not exceed the specified trim range or maximum power ratings when adjusting trim. Use 1% precision resistors mounted close to the converter on short leads. (For the UCQ-1.2/40-D24 and -1.2/30-D48) Trim Down Connect trim resistor between trim pin and -Sense RTrimDn (k ) = 5.11 2 - 2 Trim Up Connect trim resistor between trim pin and +Sense RTrimUp (k ) = 5.11 x VNOM x (1+ 1.225 x
Trim Equations
Figure 6. Trim Connections To Increase Output Voltages Using Fixed Resistors
Trim adjustments greater than the specified range can have an adverse affect on the converter's performance and are not recommended. Excessive voltage differences between VOUT and Sense, in conjunction with trim adjustment of the output voltage, can cause the over-voltage protection circuitry to activate (see Performance Specifications for over-voltage limits). Temperature/ power derating is based on maximum output current and voltage at the converter's output pins. Use of the trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the converter's specified rating, or cause output voltages to climb into the output over-voltage region. Therefore: (Vout at pins) x (Iout) rated output power
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MDC_UCQ Models.B07 Page 11 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Typical Performance Curves
The Trim pin (pin 6) is a relatively high impedance node that can be susceptible to noise pickup when connected to long conductors in noisy environments. In such cases, a 0.22F capacitor between trim and -Vout can be added to reduce this long lead effect. On/Off Control The input-side, remote On/Off Control function (pin 2) can be ordered to operate with either polarity: Positive (no suffix): standard models are equipped with Positive-polarity and are enabled when pin 2 is left open (or is pulled high, applying +3.5V to +13.5V with respect to -Input, pin 1) as per Figure 8. Positive-polarity devices are disabled when pin 2 is pulled low (0 to 0.8V with respect to -Input).
Figure 8. Driving the Negative Polarity On/Off Control Pin
Negative ("N" suffix): Optional Negative-polarity devices are off when pin 2 is left open (or pulled high, applying +3.5V to +13.5V), and on when pin 2 is pulled low (0 to 1V) with respect to -Input as shown in Figure 9.
Figure 9. Driving the Negative Polarity On/Off Control Pin
Dynamic control of the remote on/off function is best accomplished with a mechanical relay or an open-collector/open-drain drive circuit (optically isolated if appropriate). The drive circuit should be able to sink appropriate current (see Performance Specifications) when activated and withstand appropriate voltage when deactivated. Applying an external voltage to pin 2 when no input power is applied to the converter can cause permanent damage to the converter.
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MDC_UCQ Models.B07 Page 12 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Typical Performance Curves
UCQ-1.2/30-D48 Efficiency vs Line Voltage and Load Current @25 C 95 90 85
Output Current (Amps) UCQ-1.2/30-D48 Maximum Current Temperature Derating No baseplate, VIN = 48V (at sea level), longitudinal airflow 35 30 25 20 15 100 lfm 10 5 0 30 35 40 45 50 55 60 65 70 75 80 Ambient Temperature (C) 300 lfm 200 lfm
80 Efficiency (%) 75 70 65 60 55 50 45 40 3 6 9 12 15 18 21 24 27 75 30 VIN = 75V VIN = 48V VIN = 36V
400 lfm
Load Current (Amps)
UCQ-1.5/25-D48 Efficiency vs Line Voltage and Load Current @25 C
90 88 86 84 82 80 78 76 74 72 70 68 66 64 62 60 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
UCQ-1.5/25-D48 Maximum Current Temperature Derating No baseplate, VIN = 48V (at sea level), longitudinal airflow
30
25
Output Current (Amps)
Efficiency (%)
20
VIN = 75V VIN = 48V VIN = 36V
15
10 300 lfm 5 200 lfm 100 lfm
400 lfm
0 30 35 40 45 50 55 60 65 70 75 80
Load Current (Amps)
UCQ-1.8/30-D48 Efficiency vs Line Voltage and Load Current @25 C 90 88 86
Output Current (Amps) 30 28 26 24 22
Ambient Temperature (C)
UCQ-1.8/30-D48 Maximum Current Temperature Derating No baseplate, VIN = 48V (at sea level), longitudinal airflow 32
Efficiency (%)
84 82 80 78 76 74 72 70 4 6 8 10 12
VIN = 36V VIN = 48V VIN = 75V
400 lfm 300 lfm 200 lfm 100 lfm Natural convection
20 18
14
16
18
20
22
24
26
28
30
30
35
40
45
50
55
60
65
70
75
80
Load Current (Amps)
Ambient Temperature (C)
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MDC_UCQ Models.B07 Page 13 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Typical Performance Curves
UCQ-2.5/30-D48 Efficiency vs Line Voltage and Load Current @25 C 95 90 85 80 Efficiency (%)
UCQ-2.5/30-D48 Maximum Current Temperature Derating No baseplate, VIN = 24V (at sea level) 35 30 Output Current (Amps) 25 20 15 10 5 200 lfm 100 lfm 400 lfm 300 lfm
75 70 65 60 55 50 45 40 1 3 6 9 12 15 18 21 24 27 30 VIN = 75V VIN = 48V VIN = 36V
0 30 35 40 45 50 55 60 65 70 75 80 Ambient Temperature (C)
Load Current (Amps)
UCQ-2.5/40-D24 Efficiency vs Line Voltage and Load Current @25 C 95 90 85
UCQ-2.5/40-D24 Maximum Current Temperature Derating No baseplate, VIN = 24V (at sea level) 35 30 Output Current (Amps)
Efficiency (%)
80 75 70 65 60 55 50 3 6 9 VIN = 35V
VIN = 24V VIN = 18V
25 20 15 10 5 100 lfm 300 lfm 200 lfm
400 lfm
12
15
18
21
24
27
30
33
36
39 40
0 30 35 40 45 50 55 60 65 70 75 80 Ambient Temperature (C)
Load Current (Amps)
UCQ-3.3/30-D48 Efficiency vs Line Voltage and Load Current @25C 95
UCQ-3.3/30-D48 Maximum Current Temperature Derating No baseplate, VIN = 48V (at sea level) 40 35
90
Output Current (Amps)
30 25 20 100 lfm 15 200 lfm 10 300 lfm 5 400 lfm 0
Efficiency (%)
85 VIN = 36V 80 VIN = 50V VIN = 75V
75
70
25
30
35
40
45
5
10
15
20
25
30
65 60 55 50 Ambient Temperature (C)
70
75
80
85
Load Current (Amps)
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MDC_UCQ Models.B07 Page 14 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Typical Performance Curves
UCQ-3.3/30-D48 Maximum Current Temperature Derating With baseplate, VIN = 48V (at sea level) 40 35 Output Current (Amps) 30 25 20 100 lfm 15 200 lfm 10 300 lfm 5 400 lfm 0 UCQ-3.3/35-D48 Maximum Current Temperature Derating With baseplate, VIN = 48V (transverse air flow at sea level) 36 34 32 Output Current (Amps) 30 28 26 24 22 20 200 lfm 300 lfm 400 lfm Natural Convection 100 lfm
25
30
35
40
45
65 60 55 50 Ambient Temperature (C)
70
75
80
85
18
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (C)
UCQ-3.3/35-D24 Maximum Current Temperature Derating No baseplate, VIN = 48V (at sea level), longitudinal airflow 35 30 Output Current (Amps) 25 20 15 10 200 lfm 5 0 100 lfm 400 lfm 300 lfm
UCQ-3.3/35-D24 Efficiency vs Line Voltage and Load Current @25 C 92 90 88 86 Efficiency (%) 84 82 80 78 76 74 72 70 3 5 7 9 11 15 17 19 21 23 25 27 29 31 33 35 Load Current (Amps) VIN = 18V VIN = 36V VIN = 24V
30
35
40
45
50
55
60
65
70
75
80
Ambient Temperature (C)
UCQ-5/20-D48 Efficiency vs Line Voltage and Load Current @25C 95
90
Efficiency (%)
85
VIN = 36V
80
VIN = 50V VIN = 75V
75
70
4
6
8
10
12
14
16
18
20
Load Current (Amps)
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MDC_UCQ Models.B07 Page 15 of 16
Single Output UCQ Models
Low-Profile, Quarter Brick, 8.3-40 Amp Isolated DC/DC Converters
Typical Performance Curves
UCQ-12/8.3-D48 Efficiency vs Line Voltage and Load Current @25 C 96 94 92 VIN = 75V VIN = 48V VIN = 36V
Output Current (Amps) 8 7 6 5 4 3 2 1 0 0 100 lfm 300 lfm 200 lfm 400 lfm UCQ-12/8.3-D48 Maximum Current Temperature Derating No baseplate, VIN = 48V (at sea level), longitudinal airflow 9
90 Efficiency (%) 88 84 82 80 78 76 74 72 70 0.8 1.6 2.4 3.2 4 4.8 5.6 6.4 7.2 8.3
30
35
40
45
50
55
60
65
70
75
80
Load Current (Amps)
Ambient Temperature (C)
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
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Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2008 Murata Power Solutions, Inc.
08/19/08 05/09/08
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