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PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
200-W 48-V INPUT, 8-V OUTPUT, SEMI-REGULATED, ISOLATED DC-DC BUS CONVERTER
FEATURES
* * * * * * * * * * * * * * * 200-W Output Input Voltage Range: 36 V to 75 V Meets 100 V, 100 ms Input Transient 6:1 Input-to-Output DC Conversion Ratio: 36 V to 55 V Input 10.5 V Output Voltage Limit: > 55 V Input 93% Efficiency 1500 VDC Isolation On/Off Control Overcurrent Protection Over-Temperature Shutdown Undervoltage Lockout SmartSync External Clock Drive (Optional) AutoTrackTM Power-Up Sequencing (Optional) Standard 1/4-Brick Bus Converter Footprint UL Safety Agency Approval (Pending)
DESCRIPTION
The PTQB425080 power module is single-output isolated DC/DC converter, housed in an industry standard quarter-brick package. The module is nominally rated up to 200 W with a maximum load current of 25 A. It will deliver an output voltage of 1/6th the input voltage for an input voltage range of 36 V to 55 V, while limiting the output voltage to 10.5 V for an input voltage greater than 55 V. The PTQB425080 operates from a standard 48-V telecom central office (CO) supply and occupies only 3.3 in2 of PCB area. The module offers OEMs a compact and flexible high-output power source in an industry standard footprint. It is suitable for distributed power applications in both telecom and computing environments that utilize an intermediate bus architecture (IBA), and may be used for powering downstream point-of-load (POL) devices such as the second generation PTH series of products (T2). Features include a remote On/Off control with optional logic polarity, and an undervoltage lockout (UVLO). Protection features include output over-current protection (OCP) and over-temperature protection (OTP). To compliment T2-POL products, optional features include a SmartSync compatible clock drive and a AutoTrackTM power-up sequencing manager The module is fully integrated for stand-alone operation, and require no additional components. STANDARD APPLICATION
+VO
+VI +
1 CI (Optional)
+VI PTQB425080N
+VO
7 + CO (Optional) Point-of-Load Power Module Inputs
-VI
3
-VI Remote On/Off 2
-VO
4
-VO
UDG-06086
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright (c) 2006-2007, Texas Instruments Incorporated
PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TI website at www.ti.com.
PART NUMBERING SCHEME
Input Voltage PTQB 4 4 = 48 V Output Current 25 25 = 25A Output Voltage 080 080 = 8 V Enable N N = Negative P = Positive Electrical Options 2 2 = Standard 3 = SmartSync Clock Drive and AutoTrackTM Enable A Pin Style D D = Through-hole, Pb-free
ABSOLUTE MAXIMUM RATING
UNIT TA VI,
MAX
Operating Temperature Range Maximum Input Voltage Maximum Output Power Storage Temperature Mechanical Shock Mechanical Vibrarion Weight Flammability
Over VI Range Continuous voltage Peak voltage for 100 ms duration VI = 48 V
-40C to 85C (1) 75 V 100 V 200 W -40C to 125C
PO,
MAX
TS
Per Mil-STD-883, Method 2002.3 1 ms, 1/2 Sine, mounted Per Mil-STD-883, Method 2007.2 20-2000 Hz, PCB mounted Meets UL 94V-O
AD Suffix AD Suffix
250 G 15 G 30 grams
(1)
See SOA curves or consult factory for appropriate derating.
2
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PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
ELECTRICAL CHARACTERISTICS PTQB425080
(Unless otherwise stated, TA =25C, VI = 48 V, VO = 8 V, CO = 10 F, and IO = IOmax
PARAMETER IO VI VO tol Regline Regload VR ITRIP OTP fs UVLO Output Current Input Voltage Range Output Voltage Tolerance Line Regulation Load Regulation Efficiency VO Ripple (pk-pk) Overcurrent Threshold Over Temperature Protection Switching Frequency Undervoltage Lockout Over VI range Over IO range Over VI and IO range 36 VI 55 V 55 < VI 75 V, VO = 9.5 V Over IO range IO = IOmax 20 MHz bandwidth Shutdown, followed by auto-recovery Temperature Measurement at thermal sensor. Hysteresis = 10C nominal. Over VI range VOFF VHYS VI decreasing, IO = 10 A Hysteresis 2.4 -0.2 -0.3 4.5 -0.2 -0.5 Output disabled (pin 2 status set to Off) Between +VI and -VI Between +VO and -VO Input-to-output and input-to-case Input-to-output Input-to-output TTL Output signal for synchronizing POL modules Signal Amplitude Signal Frequency 10 5 275 0 0 1500 500 3 100 3000 Open (1) 0.8 35 125 275 32.5 1.5 Open (1) 0.8 TEST CONDITIONS MIN 0 36 5.4 0.17 10 40 93% 100 mVpp A C kHz V 48 TYP MAX 25 75 10.5 UNIT A V V V/V % mV/A
On/Off Input: Negative Enable VIH VIL IIL VIH VIL IIL IISB CI CO Input High Voltage Input Low Voltage Input Low Current Input High Voltage Input Low Voltage Input Low Current Standby Input Current External Input Capacitance External Output Capacitance Isolation Voltage Isolation Capacitance Isolation Resistance fss SmartSync Clock Drive (pin 5) Referenced to -VI V mA
On/Off Input: Positive Enable Referenced to -VI V mA mA F F Vdc pF M Vpk-pk kHz
(1)
The Remote On/Off input has an internal pull-up and may be controlled with an open collector (drain) interface. An open circuit correlates to a logic high. Consult the application notes for interface considerations.
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PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
TERMINAL FUNCTIONS
TERMINAL NAME +VI (1) -VI (1) Remote On/Off NO. 1 3 2 DESCRIPTION The positive input for the module with respect to -VI. When powering the module from a negative input voltage, this input is connected to the input source ground. The negative input supply for the module, and the 0-V reference for the enable input. When powering the module from a positive source, this input is connected to the input source return. This input controls the On/Off status of the output voltage. It is either driven low (-VI potential), or left open-circuit. For units identified with the N (negative logic) option, applying a logic low to this pin will enable the output. And for units identified with the P (positive logic) option, the output will be disabled. This is the positive power output with respect to -VO. It is isolated from the input power pins and produces a valid output voltage approximately 80 ms before the voltage at the Track terminal is allowed to rise. This provides the required standby power source to any downstream nonisolated modules in power-up sequencing applications. This is the output power return for both the +VOoutput voltage. This terminal should be connected to the common of the load circuit. This terminal is used in power-up sequencing applications to control the output voltage of Auto-Track compatible modules, powered from the converter +VO output. The converter Track control has an internal, open-collector transistor, which holds the voltage close to -VO potential for approximately 80 ms after the +VO output is in regulation. Following this delay, the Track voltage rises simultaneously with the output voltages of all other modules controlled by Auto-Track. See Application Information for more details. This terminal signal a 275kHz clock signal that can be used to synchronize multiple downstream point-of-load power modules. Frequency synchronization eliminates beat frequencies and reduces the external filtering requirement. See Application Information for more details.
+VO -VO AutoTrackTM Enable (Optional) SmartSync Clock Drive (Optional) (1)
7 4
6
5
These functions indicate signals electrically common with the input.
PTQB425080x3
1 2 3 +VO Track SmartSync -VO 7 6 5 4 1 2 3
PTQB425080x2
+VO 7
+VI On/Off -VI
+VI On/Off -VI
-VO
4
4
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PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
TYPICAL CHARACTERISTICS PTQB425080
All data listed in the graphs below have been developed from actual products tested at 25C. This data is considered typical data for the DC-DC Converter. SOA curves represent operating conditions at which internal components are at or below manufacturer's maximum rated operating temperature. For Figure 3 Safe Operating Area, VI = 48 V.
EFFICIENCY vs LOAD CURRENT
100 VI = 48 V 95 90 85 80 75 70 65 60 0 5 10 15 IO - Output Current - A 20 25 V VII 36 V 48 V 75 V
POWER DISSIPATION vs LOAD CURRENT
20 18 PD - Power Dissipation - W 16 14 12 10 8 6 4 2 0 0 5 VI = 36 V 10 15 IO - Output Current - A 20 25 VVI I 36 V 48 V 75 V VI = 48 V VI = 75 V TA - Ambient Temperature - C 90
AMBIENT TEMPERATURE vs LOAD CURRENT
600 LFM
80
200 LFM
- Efficiency - %
70 100 LFM 60 Natural Convection
VI = 75 V
VI = 36 V
50
40
30
LFM 0 100 200 400 600 0 5 10
400 LFM
20 15 20 25 IO - Output Current - A
Figure 1. LINE REGULATION
12 IO = 12 A 10
Figure 2. LOAD REGULATION
12 VI = 75 V 10 VO - Output Voltage - V VI = 60 V
Figure 3.
IO = 0 A VO - Output Voltage - V 8
8
6
6
4
IO = 30 A IO
4 VI = 36 V VI = 48 V VI 36 V 48 V 60 V 75 V 0 5 10 15 IO - Output Current - A 20 25
2
0A 12 A 30 A 42 48 54 60 66 72 78
2
0 36
0
VI - Input Voltage - V
Figure 4.
Figure 5.
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PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
APPLICATION INFORMATION Operating Features and System Considerations for the PTQB425080 Series of DC/DC Converters
Overcurrent Protection To protect against load faults, these converters incorporate output overcurrent protection. Applying a load to the output that exceeds the converter's overcurrent threshold (see applicable specification) will cause the output voltage to momentarily fold back, and then shut down. Following shutdown the module will periodically attempt to automatically recover by initiating a soft-start power-up. This is often described as a hiccup mode of operation, whereby the module continues in the cycle of successive shutdown and power up until the load fault is removed. Once the fault is removed, the converter automatically recovers and returns to normal operation. Overtemperature Protection Overtemperature protection is provided by an internal temperature sensor, which closely monitors the temperature of the converter's printed circuit board (PCB). If the sensor exceeds a temperature of approximately 125C, the converter will shut down. The converter will then automatically restart when the sensed temperature drops back to approximately 95C. When operated outside its recommended thermal derating envelope (see data sheet SOA curves), the converter will typcially cycle on and off at intervals from a few seconds to one or two minutes. This is to ensure that the internal components are not permanently damaged from excessive thermal stress. Undervoltage Lockout The Undervoltage lockout (UVLO) is designed to prevent the operation of the converter until the input voltage is at the minimum input voltage. This prevents high start-up current during normal power-up of the converter, and minimizes the current drain from the input source during low input voltage conditions. The UVLO circuitry also overrides the operation of the Remote On/Off control. Primary-Secondary Isolation The converter incorporates electrical isolation between the input terminals (primary) and the output terminals (secondary). All converters are production tested to a withstand voltage of 1500 VDC. This specification complies with UL60950 and EN60950 and the requirements for operational isolation. This allows the converter to be configured for either a positive or negative input voltage source. The data sheet Pin Descriptions section provides guidance as to the correct reference that must be used for the external control signals. Input Current Limiting The converter is not internally fused. For safety and overall system protection, the maximum input current to the converter must be limited. Active or passive current limiting can be used. Passive current limiting can be a fast acting fuse. A 125-V fuse, rated no more than 10 A, is recommended. Active current limiting can be implemented with a current limited Hot-Swap controller. Thermal Considerations Airflow may be necessary to ensure that the module can supply the desired load current in environments with elevated ambient temperatures. The required airflow rate may be determined from the Safe Operating Area (SOA) thermal derating chart (see typical characteristics).
6
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PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
Using the Remote On/Off Function on the PTQB425080 Series of DC/DC Converters
For applications requiring output voltage On/Off control, the PTQB425080 series of DC/DC converters incorporate a Remote On/Off control (pin 2). This feature can be used to switch the module off without removing the applied input source voltage. When placed in the Off state, the standby current drawn from the input source is typically reduced to 3 mA. Negative Output Enable (N Option) Models using the negative enable option, the Remote On/Off (pin 2) control must be driven to a logic low voltage for the converter to produce an output. This is accomplished by either permanently connecting pin 2 to -VI (pin 3), or driving it low with an external control signal. Table 1 shows the input requirements of pin 2 for those modules with the NEN option. Table 1. On/Off Control Requirements for Negative Enable
PARAMETER VIH VIL Vo/c II Disable Enable Open-Circuit Pin 2 at -VI MIN 2.4 V -0.2 V 9V TYP MAX 20 V 0.8 V 15 V -0.75 mA
Positive Output Enable (P Option) For those models with the positive enable option, leaving pin 2 open circuit, (or driving it to an equivalent logic high voltage), will enable the converter output. This allows the module to produce an output voltage whenever a valid input source voltage is applied to +VI with respect to -VI. If a logic-low signal is then applied to pin 2 the converter output is disabled. Table 2 gives the input requirements of pin 2 for modules with the PEN option. Table 2. On/Off Control Requirements for Positive Enable
PARAMETER VIH VIL Vo/c II Enable Disable Open-Circuit Pin 2 at -VI MIN 4.5 V -0.2 V 5V TYP MAX 20 V 0.8 V 7V -0.5 mA
Notes: 1. The Remote On/Off control uses -VI (pin 3) as its ground reference. All voltages are with respect to -VI. 2. An open-collector device (preferably a discrete transistor) is recommended. A pull-up resistor is not required. If one is added the pull-up voltage should not exceed 20 V. Caution:Do not use a pull-resistor to +VI (pin 1). The remote On/Off control has a maximum input voltage of 20 V. Exceeding this voltage will overstress, and possibly damage, the converter. 3. The Remote On/Off pin may be controlled with devices that have a totem-pole output. This is provided the output high level voltage (VOH) meets the module's minimum VIH specified in Table 1. If a TTL gate is used, a pull-up resistor may be required to the logic supply voltage. 4. The converter incorporates an undervoltage lockout (UVLO). The UVLO keeps the converter off until the input voltage is close to the minimum specified operating voltage. This is regardless of the state of the Remote On/Off control. Consult the product specification for the UVLO input voltage thresholds.
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PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
PTQB425080P 2 1 = Disable Q1 BSS138 Remote On/Off
-VI 3 -VI
UDG-06085
Figure 6. Recommended Control for Remote On/Off Input Turn-On: With a valid input source voltage applied, the converter produces a regulated output voltage within 75 ms of the output being enabled. Figure 7 shows the output response of the PTQB425080P following the removal of the logic-low signal from the Remote On/Off (pin 2); see Figure 6. This corresponds to the drop in Q1 VGS in Figure 7. Although the rise-time of the output voltage is short (<10 ms), the indicated delay time will vary depending upon the input voltage and the module's internal timing. The waveforms were measured with 48 VDC input voltage, and a 10-A resistive load.
VO (2 V/div)
Q1 VGS (2 V/div)
t - Time - 4 ms/div
Figure 7. Power Up
Simultaneous Power-Up Sequencing Using AutoTrackTM Control (Optional Feature)
The PTQB425080 bus converter will provide the input power and coordinate the power-up sequencing to two or more non-isolated, Auto-Track compliant power modules. Figure 8 shows the PTQB425080 converter (U1) configured to provide both the input source and the power-up sequence timing to two wide-nput non-isolated modules. The example shows a simplified block diagram of two PTH08T220W modules (U2 and U3), each rated for up to 16 A of output current. In this case, the number of downstream modules, and their respective output voltage and load current rating, is only limited by the amount of current available at the +VO output (25 A maximum). In this example, they are set to 3.3 V (R2 = 1.21 k) and 1.8 V (R3 = 4.78 k), respectively. Figure 9 shows the power-up waveforms from when the Track control of all three modules are simply connected together. The PTQB425080 converter (U1) provides the required intermediate voltage from the +VObus output to power the downstream modules, while holding the common Track control at ground potential. After allowing times for U2 and U3 to initialize, U1 removes the ground from the Track control, allowing this voltage to rise. The outputs from the two nonisolated modules then rise simultaneously to their respective set-point voltages.
8
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PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
Track +VI
6 10
1
+VI +VO U1 PTQB425080N 7 VO Bus (8 V) + 2
U2 VI
Track PTH08T220W Inhibit GND 3,4 VO 5
VPOL1 (3.3 V)
+ CI 100 F 2
VOAdj 8 R2 1.21 k C4 470 F
On/Off
C2 100 F
C3 470 F
11
-VI 3 -VI -VO 4 10 U3 2 VI
Track PTH08T220W GND 3,4 VO 5
VPOL2 (1.8 V)
Inhibit 11 C5 470 F
VOAdj 8 R3 4.78 k C6 470 F
UDG-06088
Figure 8. Power-Up Sequencing Using AutoTrackTM Control
VO Bus (U1) (5 V/div)
VO Track (1 V/div)
VPOL1 (U2) (1 V/div)
VPOL2 (U3) (1 V/div) Delay Time
t - Time - 40 ms/div
Figure 9. AutoTrackTM Control Waveform
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PTQB425080
www.ti.com
SLTS269A - DECEMBER 2006 - REVISED JANUARY 2007
Synchronizing Multiple POL Modules using SmartSync Clock Drive
The PTQB425080 provides a 275 kHz SmartSync clock signal that may be used to synchronize multiple downstream non-isolated modules to a common frequency. Figure 10 shows a simplified block diagram of the PTQB425080 clock signal driving the SmartSync input of two PTH08T220W modules. Synchronizing modules powered from the same bus, eliminates beat frequencies reflected back to the input supply, and also reduces EMI filtering requirements. These are the benefits of Smart Sync. Power modules can also be synchronized out of phase to minimize source current loading and minimize input capacitance requirements. Figure 10 also shows module U2 synchronized 180 out of phase with module U3 using an inverter circuit.
fCLK = 275 kHz Inverter
SmartSync +VI 1 +VI
5
1 U2 VO Bus (8 V) + CI 100 F 2 On/Off +VO U1 PTQB425080N 7 + C2 100 F C3 470 F 2 SmartSync PTH08T220W Inhibit GND 11 3,4 VOAdj 8 R2 1.21 k C4 470 F 5 VPOL1 (3.3 V)
-VI
3
-VI
-VO
4 1 U3 2 SmartSync PTH08T220W Inhibit 11 C5 470 F GND 3,4 VOAdj 8 R3 12.1 k C6 470 F 5 VPOL2 (1.2 V)
UDG-06087
Figure 10. Synchronizing Modules Powered from the Same Bus
10
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PACKAGE OPTION ADDENDUM
www.ti.com
15-Jan-2007
PACKAGING INFORMATION
Orderable Device PTQB425080N2AD PTQB425080N3AD PTQB425080P2AD PTQB425080P3AD
(1)
Status (1) ACTIVE ACTIVE ACTIVE ACTIVE
Package Type DIP MOD ULE DIP MOD ULE DIP MOD ULE DIP MOD ULE
Package Drawing EBY EBY EBY EBY
Pins Package Eco Plan (2) Qty 5 7 5 7 9 9 9 9 Pb-Free (RoHS) Pb-Free (RoHS) Pb-Free (RoHS) Pb-Free (RoHS)
Lead/Ball Finish Call TI Call TI Call TI Call TI
MSL Peak Temp (3) N / A for Pkg Type N / A for Pkg Type N / A for Pkg Type N / A for Pkg Type
The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
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