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參數(shù)資料
| 型號： | 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)： | 10/41頁 |
| 文件大?。?/td> | 1270K |
| 代理商： | TPS65167RHAT |
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750kHz
Oszillator
VFB
1.154V
Comparator
GM Amplifier
Sawtooth
Generator
VFB
1.154
AVIN
RHVS
SW
PGND
M1
GM Amplifier
LowGain
Currentlimit
and
SoftStart
M2
SUP
Vref
Overvoltage
Comparator
OVP
ControlLogic
SUP
Softstart
70 W
EN
GD
HVS
5 kW
IDLY
SS
COMP
FB
Softstart (Boost Converter)
High Voltage Stress Test (Boost converter and positive charge pump)
HVS
FB
R1 + R2//R3
Vs
= V
= 1.146V
R2//R3
HSV
FB
R1 x R2
R3 =
Vs
1
x R2 - R1
V
-
÷
è
(3)
SLVS760C – APRIL 2007 – REVISED MARCH 2008
Figure 24. Block Diagram Boost Converter
The main boost converter has an internal softstart to prevent high inrush current during start-up. The device
incorporates a digital softstart increasing the current limit in digital current limit steps. See Figure 2 for the typical
softstart timing.
The TPS65167 and TPS65167A incorporates a high voltage stress test where the output voltage of the boost
converter Vs and the positive charge pump POUT is set to a higher voltage compared to the nominal
programmed output voltage. The High Voltage Stress test is enabled by pulling the HVS pin to high. With HVS =
high, the voltage on POUT, respectively VGH, remains unchanged with the TPS65167A and the TPS65167
regulates to a fixed output voltage of 30 V. The boost converter Vs is programmed to a higher voltage
determined by the resistor connected to RHVS. With HVS = high the RHVS pin is pulled to GND which sets the
voltage for the boost converter during the High Voltage Stress Test. The output voltage for the boost converter
during high voltage stress test is calculated as:
18
Copyright 2007–2008, Texas Instruments Incorporated
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