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參數(shù)資料
| 型號(hào)： | TPS65167RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.9 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, QFN-40 |
| 文件頁數(shù)： | 8/41頁 |
| 文件大小： | 1270K |
| 代理商： | TPS65167RHAT |
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Start-Up Sequencing
EN
GDLY
Vs
POUT
VIN
VLOGIC
Vaux
VGL
VGH
withCTRL=high
AVIN = UVLO
AVIN =UVLO-
Vhys
td
GD
SLVS760C – APRIL 2007 – REVISED MARCH 2008
Boost converter Vs: A short circuit is detected when the voltage on SUP, that is connected to the output falls
typically below 4.5V. Then the isolation switch is opened by pulling GD high. After a delay of typically 60mS the
isolation switch is closed again and restarts the output automatically. See Figure 6.
Buck converter Vlogic: During a short circuit even the output current is typically limited to the buck converter
switch current limit of 3.5A and the switching frequency is reduced.
Negative charge pump VGL: As the output falls below the power good limit threshold the output current is limited
to the softstart current limit of the negative charge pump.
Positive charge pump output VGH: As the output POUT falls below its power good threshold then the internal
gate voltage shaping switch opens disconnecting the load from POUT. As the output POUT exceeds the power
good threshold again the internal switch of the gate voltage shaping block is closed again. The VGH output
cycles as long as the short circuit event remains.
LDO controller VAUX: During a short circuit event the maximum output current is given by the gain of the
external transistor. Depending on the selected output transistor the power dissipation of the external transistor
might be exceeded during a short circuit event. Using a base series resistor protects the IC during a short circuit
event.
The device has an adjustable start-up sequencing to provide correct sequencing as required by LCD. When the
input voltage exceeds the undervoltage lockout threshold, then the step-down converter and LDO controller
start-up at the same time. As the enable signal (EN) goes high, the negative charge pump starts up followed by
the boost converter Vs starting at the same time as the positive charge pump. See the typical curves shown in
Figure 23. Power Up Sequencing
16
Copyright 2007–2008, Texas Instruments Incorporated
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