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参数资料
| 型号： | PTQB425080N3AD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 200 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-7 |
| 文件页数： | 13/14页 |
| 文件大小： | 466K |
| 代理商： | PTQB425080N3AD |
2
Remote On/Off
3
Q1
BSS138
1 = Disable
PTQB425080P
VI
UDG06085
t Time 4 ms/div
VO (2 V/div)
Q1 VGS (2 V/div)
Simultaneous Power-Up Sequencing Using AutoTrack Control (Optional Feature)
SLTS269B – DECEMBER 2006 – REVISED NOVEMBER 2007........................................................................................................................................ www.ti.com
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 varies 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.
Figure 7. Power Up
The PTQB425080 bus converter provides 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
Copyright 2006–2007, Texas Instruments Incorporated
Product Folder Link(s): PTQB425080
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