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参数资料
| 型号： | PTH05T210WAZT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, PLASTIC, DIP-14 |
| 文件页数： | 14/31页 |
| 文件大小： | 1135K |
| 代理商： | PTH05T210WAZT |
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Output On/Off Inhibit
1 Inhibit/
UVLO
GND
2, 6
GND
3,4
7,8
VI
1 = Inhibit
Q1
BSS 138
PTH05T210W
CI
Overcurrent Protection
www.ti.com ...................................................................................................................................................... SLTS263I – AUGUST 2007 – REVISED MARCH 2009
For applications requiring output voltage on/off control, the PTH05T210W incorporates an output Inhibit control
pin. The inhibit feature can be used wherever there is a requirement for the output voltage from the regulator to
be turned off.
The power modules function normally when the Inhibit pin is left open-circuit, providing a regulated output
whenever a valid source voltage is connected to VI with respect to GND.
Figure 14 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit input
has its own internal pull-up to a potential of 5 V. The input is not compatible with TTL logic devices and should
not be tied to VI. An open-collector (or open-drain) discrete transistor is recommended for control.
Figure 14. On/Off Inhibit Control Circuit
Figure 15. Power-Up Response from Inhibit Control
Turning Q1 on applies a low voltage to the Inhibit control pin and disables the output of the module. If Q1 is then
turned off, the module executes a soft-start power-up sequence. A regulated output voltage is produced within 25
ms. Figure 15 shows the typical rise in both the output voltage and input current, following the turn-off of Q1. The
turn off of Q1 corresponds to the rise in the waveform, VINH. The waveforms were measured with a 20-A resistive
load.
NOTE: When applying a low voltage (
≤0.6 V) to the Inhibit control pin to turn off the module, the low side
FET will immediately discharge any capacitance on the output bus. Depending on the amount and type
of capacitors, this may induce a negative voltage transient that can momentarily go below GND potential.
If turn-off control is desired, the Auto-Track pin can be used to the control ramp up and ramp down of
the output voltage.
For protection against load faults, all modules incorporate output overcurrent protection. Applying a load that
exceeds the regulator's overcurrent threshold causes the regulated output to shut down. Following shutdown, a
module periodically attempts to recover by initiating a soft-start power-up. This is described as a hiccup mode of
operation, whereby the module continues in a cycle of successive shutdown and power up until the load fault is
removed. During this period, the average current flowing into the fault is significantly reduced. Once the fault is
removed, the module automatically recovers and returns to normal operation.
Copyright 2007–2009, Texas Instruments Incorporated
21
Product Folder Link(s): PTH05T210W
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