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BTCPower
Technical Specification
S15-48-12
TM
Broadband TelCom Power, Inc.
Redefining "Current" Limits In Power Conversion
48Vin 12Vout 1.25A
Description
The S15 family of high efficiency, low power DC/DC converters offer power levels that exceed other bricks with similar footprints. They are targeted specifically at the telecommunication, industrial electronics, mobile telecommunication and distributed power markets. With a wide input voltage range of 36-75V they are available with output voltages of either 1. 5, 1.8, 2.5, 3.3, 5 or 12 Volts. All models feature an input filter, input undervoltage lockout, overtemperature protection, output current limiting and short circuit protection. The fully enclosed, encapsulated construction with aluminum heat spreader design achieves very efficient heat transfer with no hot spots. The use of patented design concepts facilitate maximum power delivered with the highest efficiency up to 90%. The converters combine creative design concepts with highly derated power devices to achieve very high reliability, high performance and low cost solution to systems designers requiring maximum power in small footprints.
Features
* * * * * * * * * * * * * * * * * * * * Delivers up to 15W in 1" x 1.6" format High power density up to 28.5W/inch3 Synchronous rectification topology No airflow or heat sink required No minumum load required Low profile of only 0.35 inch High output current in small footprint 1.5V, 1.8V, 2.5V, 3.3V, 5V, 12V or +/-12V models Wide input operating range 36-75V -40C to +100C ambient operation Input undervoltage lockout Output current limit and short circuit protection On/Off pin Output adjustment +/-10% range 1500V, 10M input-to-output isolation Enclosed construction with heat spreader for low temperature rise Enclosed six-sided metal shield construction for low EMI/RFI UL 60950 recognized, TUV EN60950 and CSA C22.2 No. 60950-00 Certified Meets conducted limits of FCC Class B and CEI IEC61204-3 Class B with external filter MTBF of 850,000 hours @ 50C (MIL-HDBK-217F)
Applications
* * * * * * * Telecommunications Data Communications Wireless Communications Networking Gear Servers, Switches and Data Storage Semiconductor Test Equipment Distributed Power Architecture
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 48Vin 12Vout 1.25A
BTCPower
TM
CONVERTER SELECTION
Typical @ Ta=+25C under nominal line voltage and full load conditions.
Input Voltage (Volts) Model S15-48-12 Nominal 48 Range 36-75 Current (A) No load 0.025 Full load 0.36 Output Voltage (Volts) 12.0 Current (Amps) 1.25 Efficiency 75% Load (%) 89
Consult factory for other output voltage configurations.
Outline Information and Summary Specifications
Pin Connection (Function) Pin# Single Output Dual Output 1 On/Off On/Off 2 Vin Vin 3 Vin + Vin + 4 Vout + Vout + 5 Trim Common 6 Vout Vout All dimensions are in inches [mm] All pins are dia. 0.040 [1.02] Pin material: Brass Pin finish: Gold plated Insulator pad around pins: Silicone rubber Case: Aluminum material with anodized finish Weight: 25.2g (0.9oz) Tolerance Inches Millimeters *XX 0.020 *X 0.5 *XXX 0.010 *XX 0.25 Pin: 0.002 0.05 Note: Pin 5 is NC.
Thermal derating for vertical orientation, Vin=54V Output Output Current at 40C (Amps) Output Current at 60C (Amps) Voltage Free Air 200 LFM 300 LFM Free Air 200 LFM 300 LFM (Volts) 12.0 1.25 1.25 1.25 1.25 1.25 1.25
Output Current at 80C (Amps) Free Air 0.6 200 LFM 1.0 300 LFM 1.25
The information and specifications contained in the specification are believed to be accurate and reliable at the time of publication. Specifications are subject to change without notice.
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 2 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 48Vin 12Vout 1.25A
BTCPower
TM
Electrical Specifications
Ta=25C, Vin=48V unless otherwise noted.
PARAMETER
Absolute maximum rating Input voltage Operating case temperature Storage temperature Humidity Input characteristics Operating input voltage range Turn on voltage threshold Turn off voltage threshold Transient withstand Maximum input current Off converter input current Output characteristics Output voltage set point Output voltage line regulation Output voltage load regulation Output voltage total regulation Output voltage overall drift rate Output voltage ripple and noise Output over power protection Over-voltage protection Over-temperature protection Temperature coefficient Capacitive Load Output dynamic characteristics Startup time Transient recovery time
NOTES
MIN
0 -40 -55
TYP
MAX
80 100 125 95
UNIT
V C C % V V V V A mA V % % % % mV(pk-pk) %
36
48 35
75 34 100 0.5 31
Transient duration: 100ms 100% load , 36Vin 48Vin 11.7 36~75 Vin 10%-100%Load 1 2 50 120 N/A N/A 12
20Mz bandwidth, 100% Load, 48Vin 100
12.3 0.3 0.5 2 3 100 140
0 5% to 95% of the output voltage 25% load change 50
0.04 10,000 100 800 2 89 2000 1100 1100
%/C F ms s %Vo % VDC VDC VDC M pF KHz V V V V % Hrs g(oz)
Transient peak deviation 25% load change Efficiency (see efficiency curve) 100% load efficiency 48 Vin Isolation characteristics Isolation voltage (primary to secondary ) 1minute Isolation voltage (primary to case) 1minute Isolation voltage (secondary to case) 1minute Isolation resistance 500VDC, Primary to secondary Isolation capacitance Primary to secondary Feature Characteristics Switching frequency ON/OFF control (Positive logic) S15-48-12 Converter On Converter Off ON/OFF control (Negative logic) Converter On S15-48-12N Converter Off Output voltage trim range Percentage of normal output Calculated MTBF Bellcore @ 50C Weight
10 1000 225 3 -1 -1 3 -8 1,100,000 20.7(0.7) 250 275 7 1.2 1.2 7 +10
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 3 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 48Vin 12Vout 1.25A
BTCPower
Remote Sense
The unit does NOT have remote sense pins.
TM
Basic Operation And Functions
S15-48-12/S15-48-12N is a high efficiency, isolated DC/DC converter. Neither heat sink nor airflow is required when the unit operates at ambient temperature of 25C. The unit has basic control, output adjustment and protection functions.
Trim Pin
S15-48-12 Brick does not have Trim pin. S15-48-12N Brick has Trim pin.
Input (Pin 2, Pin 3)
Input power Vin(+) must be connected to Positive input pin 3; Input power Vin(-) must be connected to Negative input pin2.
Output (Pin 4, Pin 6)
Output power Vout(+) must be connected to Positive output pin 4; Output power Vout(-) must be connected to Negative output pin6.
Output Trim (Pin 5)
Permits the user to adjust the output voltage up or down to achieve the custom voltage or to make the output voltage margining. The unit's output voltage can be adjusted up 10% or down 8% relative to the rated output voltage by adding an external resistor between pin 5 and one of the output pins (pin 4 and 6). To increase the output voltage, a trim resistor should be connected between pin 5(Trim) and pin 6 (Vout-), as shown in Fig 2. To decrease the output voltage, a trim resistor should be connected between pin 5 (Trim) and pin 4 (Vout+), as shown in Fig 3. The recommended trim resistor values can be found in the trim table (Table 1) and charts (Fig 4 and 5).
ON/OFF (Pin 1)
Permits the user to maintain unit On/Off, in order to properly sequence different power supplies and reduce power consumption during the standby condition. There are two ON/OFF control options: positive logic (S15-48-12) and negative logic (S15-48-12N). Both are referenced to Vin-. Pin 1 is the "Enable" pin, connecting a TTL compatible pin. A TTL control signal to this pin, according to the specification, turns the unit on or off. The positive logic unit turns on when the pin is at logic high or open, and turns off at logic low. The negative logic unit turns on when the pin is at logic low, and turns off at logic high state. Typical ON/OFF connection is shown in Fig 1.
Fig 2. Configuration for increasing the output voltage Fig 1. Recommended ON/OFF circuit configuration
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 4 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 48Vin 12Vout 1.25A
BTCPower
TM
60 Trim-dn resistor (K) 50 40 30 20 10 0 2 3 4 5 6 7 8
Fig 3. Configuration for decreasing the output voltage
Trim -dn voltage change (%)
240 Trim-up Resistor (K)
Fig 5 Trim-down output vs. trim resistance
180
Trim-up volt. Trim-up resistor +2% 240 154 90 56 41 27 21 13 10 +3% +4% +5% +6% +7%
Trim-dn volt. -2% -3% -4% -5% -6% -7% -8%
Trim-dn resistor 51 33 22 13 7.5 3 0.1
120
60
0 2 3 4 5 6 7 8 9 10 Trim-up voltage change (%)
+8% +9% +10%
Fig 4 Trim-up output vs. trim resistance
Table 1 Output voltage trim vs. trim resistor value
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 5 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 48Vin 12Vout 1.25A
BTCPower
TM
Protection Features
Input under voltage lockout (UVL)
The input voltage must be at least 35V for the unit to turn on. Once the unit has been turned on, it will shut off when the input voltage drops below 34V.
Safety Requirements (SR)
The unit meets UL/CSA/TUV safety requirements per UL60950, TUV EN60950 and CSA C22.2 No.60950-00. Basic insulation is provided between input and output. Caution:
The unit does NOT have a fuse inside. The safety agencies require an external normal-blow fuse to be used at the input side to achieve maximum safety. The recommended fuse rating is 2A/100V.
Output Over-Current Protection (OCP)
The unit is protected against over current or short circuit on the output. When sensing an over current condition, the unit will enter constant current operation and reduce the output voltage. Upon short-circuit condition, the unit will shut down. After over-current or short circuit condition is removed, the unit will resume normal operation automatically.
Output Over Voltage Protection (OVP)
This unit does NOT have OVP function.
Over Temperature Protection (OTP)
This unit does NOT have OTP function.
Application Considerations
Input source Impedance
The unit has been designed to be stable with no external capacitor when used in a low inductance input and output circuit. However in many applications, the inductance with the distribution from the power source to the input of the unit can affect the stability of the unit. An external capacitor will improve the stability of the unit. Also in many applications, the user has to use decoupling capacitors at the output load, to ensure the hold up time for the load.
If the input source is non-SELV (ELV or a hazardous voltage greater than 60 Vdc and less than or equal to 75 Vdc), for the unit output to be considered meeting the requirements of safety extra low voltage (SELV), all of the following must be met: * The input source is to be provided with reinforced insulation from any hazardous voltage, including the ac main. * The input pins of the unit are not operator accessible. * For the whole system, for safety agencies requirements, and for the combination of the unit input side (primary side) and the output side (secondary side), verify that under a single fault, hazardous voltages do not appear at the unit output side (secondary side). * Never ground either of the input pins of the unit without grounding one of the output pins. This may allow a non-SELV voltage to appear between the output pin and ground.
Electromagnetic Compatibility (EMC)
The unit's conducted emission meets the requirement of EN55022 Class B Specifications, so no external input filter is needed unless a stricter conducted EMI/EMC limitation is required to satisfy or user has its own requirement on the input.
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 6 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12
Fig 6 shows the measured conducted EMC. Six-sided metal shields for zero radiated emission.
BTCPower
48Vin 12Vout 1.25A
TM
Characterization
General information
This unit has many operational characterized aspects including thermal derating, efficiency, start up and overshoot, output ripple & noise, dynamic response, over current protection curve and etc. The following pages contain specific plots or waveforms associated with the unit. Additional comments for specific data are provided below.
Test Conditions
All data presented were taken with the unit soldered to a test board, which is a 0.060" thick printed circuit board. No heat sink was used during all measurements. No airflow was used except in de-rating rest. For the input line, a 1F /100V ceramic has been used during the test. On the output side, a 10F tantalum capacitor with Esr < 0.12 and 1F ceramic capacitor have been used. Both input and output capacitors were put close to the unit. NOTE: It is important to make sure that the components on the unit do not exceed their rating.
Fig 6. Conducted EMC (150KHz-30MHz) test result, the upper trace is the limit of EN55022 Class B specification
Fig 6A. The external filter circuit C0 = 1.0 uF 250Vdc film capacitor C1 = 1.0 uF 100Vdc ceramic capacitor L1 = 2.2 mH Common mode choke
Start up
The startup scenarios are explained in Fig 7 and 8. The measured waveforms showing the turn on transient are given in Fig 9, for positive logic control units.
Input Transient Withstand (ITW)
The unit can withstand input transient voltage with 100V/100ms pulse and never be damaged.
Efficiency
Efficiency vs. load current curve at different inputs of 36V, 48V and 75V is given in Fig 10. The ambient temperature is 25C.
Efficiency with nominal input (48V) at different ambient temperatures (25C, 40C and 55C) is also given in Fig 11.
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 7 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 48Vin 12Vout 1.25A
BTCPower
TM
Dynamic Response
The dynamic response of the unit at load step is shown in Fig 12. The output load current change from 50% to 75% and return to 50% at the slew of 0.1A/s. The input is 48V and a filter of 10F tantalum capacitor and 1F ceramic capacitor is used parallel to the output.
Ripple and Noise
The output voltage waveform has been measured at full load condition, with 10F tantalum capacitor plus 1F Ceramic capacitor closely parallel to the unit's output. Fig 13 shows the output ripple and noise waveform.
Thermal De-rating
For thermal de-rating, output current vs. ambient temperature and airflow rates has been tested, and the test results are given in Fig 14. Ambient temperature varies between 55C and 90C with the airflow of 0, 100 and 200LFM (0, 0.5m/s and 1m/s).
Others
Other curve and waveforms presented include output voltage vs. current curve (Fig 15) and input current ripple waveform at full load condition (Fig 16).
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 8 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 48Vin 12Vout 1.25A
BTCPower
TM
Start up Information
Scenario #1: Initial Start up from power supply On/Off function enabled, the unit starts via input voltage Vin, see Fig 7.
Time t0 Comments On/Off pin is On: system front-end power is switched on, Vin to unit begins to rise. t1 Vin crosses Under Voltage Lockout protection circuit threshold: the unit enabled to be on t2 The unit begins to turn on ( unit turn-on delay). t3 Unit output voltage reaches 100% of normal voltage. For this example, the unit total start up time (t3- t1) is typically 200us.
Scenario #2: Initial Start up using On/Off Pin With Vin previously powered, the unit starts via On/Off pin, see Fig 8.
Time t0 t1 Comments Vin at nominal value. Arbitrary time when On/Off pin is enabled (Unit enabled) t2 End of unit turn-on delay t3 Unit Vout reaches 100% of nominal voltage. For this example, the unit total start up time (t3- t1) is typically 300us. Fig 7 Start up waveform
Fig 8. Start up using On/Off pin
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 9 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 Turn-On Transient Waveforms 48Vin 12Vout 1.25A Efficiency Curves 90
Efficiency
BTCPower
TM
80 70 60 50 0.25 0.50 0.75 1.00 1.25
Output current (A)
36V 48V 75V
Fig 9. Startup under positive logic control at Vin=48v, Iout =3A. Ch2: ON/OFF signal (1V/div) , Ch1: Output voltage (2V/div), Co=10F tantalum capacitor + 1F Ceramic capacitor, time scale: 200s/div
Fig 10. Efficiency vs. output current at various Input voltage. The ambient temperature is 25C
90
Efficiency
80 70 60 50 0.25
25C 40C 55C
0.50
0.75
1.00
1.25
Output current (A)
Fig 11. Efficiency at nominal input (48V) vs. load at different ambient temperatures of 25C, 40C, 55C without air flow, the input voltage is 48V.
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 10 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 48Vin 12Vout 1.25A
BTCPower
TM
Dynamic Response Waveform
Thermal De-Rating Curve
2
Output current(A)
1
0LFM 100FM(0.5m/s) 200LFM(1m/s)
0 50 55 60 65 70 75 80
Ambient Temperature(C)
Fig 12. Dynamic response of load step at Vin=48v, Ch1: output voltage change(100mv/div), Ch2: output current step of 50%-75%-50% (0.5A/div). Current slew rate:0.1A/s, Co=10F tantalum capacitor + 1F Ceramic capacitor, time scale: 1ms/div
Fig 14. Maximum output current vs. temperature. Both the input and output voltages are nominal.
Output Ripples and Noise Waveform
Over Current Protection Curve
Fig 15. Output voltage vs current showing current limit point and converter shut down point Fig13. Output voltage Ripple & Noise at Vin=48v, Iout=1.25A Co=10F tantalum capacitor + 1F Ceramic capacitor, ch1: 20mV/div, time scale: 1s/div.
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 11 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
Technical Specification
S15-48-12 Input Current Ripple Waveform 48Vin 12Vout 1.25A
BTCPower
TM
Fig 16. Input current ripple with full output load at 48V input (10mA/div), time scale: 1s/div
Broadband TelCom Power, Inc. - 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 12 of 12
Tel.: 714-259-4888 * Fax: 714-259-0840 * www.btcpower.com * Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05

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