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| 型號(hào)： | TPS40303DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁(yè)數(shù)： | 5/31頁(yè) |
| 文件大?。?/td> | 1798K |
| 代理商： | TPS40303DRCT |
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www.ti.com
SLUS964 – NOVEMBER 2009
Power Good
The TPS4030x provides an indication that output is good for the converter. This is an open drain signal and pulls
low when any condition exists that would indicate that the output of the supply might be out of regulation. These
conditions include the following:
VFB is more than ±12.5% from nominal
Soft-start is active
A short circuit condition has been detected
NOTE
When there is no power to the device, PGOOD is not able to pull close to GND if an
auxiliary supply is used for the power good indication. In this case, a built in resistor
connected from drain to gate on the PGOOD pull down device makes the PGOOD pin
look approximately like a diode to GND.
Thermal Shutdown
If the junction temperature of the device reaches the thermal shutdown limit of 145°C, the PWM and the oscillator
are turned off and HDRV and LDRV are driven low. When the junction cools to the required level (125°C typical),
the PWM initiates soft start as during a normal power-up cycle.
Copyright 2009, Texas Instruments Incorporated
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