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750kHz

Oszillator

VFB

1.154V

Comparator

GM Amplifier

Sawtooth

Generator

VFB

1.154

AVIN

RHVS

SW

SW

PGND

PGND

M1

GM Amplifier

LowGain

Currentlimit

and

SoftStart

M2

SUP

Vref

Vref

Overvoltage

Comparator

OVP

ControlLogic

SUP

Softstart

70 W

EN

GD

HVS

5 kW

SS

COMP

FB

Softstart (Boost Converter)

High Voltage Stress Test (Boost converter and positive charge pump)

HVS

FB

R1 + R2//R3

R1 + R2//R3

Vs

= V

= 1.146V

R2//R3

R2//R3

HSV

FB

R1 x R2

R3 =

Vs

1

x R2 - R1

V

æ

ö

-

ç

÷

è

ø

(3)

TPS65167

TPS65167A

SLVS760B – APRIL 2007 – REVISED OCTOBER 2007

Figure 22. 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:

Copyright © 2007, Texas Instruments Incorporated

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Product Folder Link(s): TPS65167 TPS65167A