_

+

_

+

_

+

_

+

_

+

REF

REF

Load Comparator

Skip Comparator

Current Limit Comparator

P-Channel

Power MOSFET

Driver

Shoot-Through

Logic

Control

Logic

Soft Start

1 MHz

Oscillator

Comparator

S

R

N-Channel

Power MOSFET

Comparator High

Comparator Low

Comparator Low 2

V(COMP)

Sawtooth

Generator

V

I

Undervoltage

Lockout

Bias Supply

_

+

Comparator High

Comparator Low

Comparator Low 2

Compensation

VREF = 0.5 V

R2

See Note

R1

VI

EN

SW

FB

GND

Gm

TPS62200, TPS62201, TPS62202, TPS62203

TPS62204, TPS62205, TPS62207, TPS62208

SLVS417F – MARCH 2002 – REVISED JUNE 2015

www.ti.com

7.2 Functional Block Diagram

For the adjustable version (TPS62200), the internal feedback divider is disabled and the FB pin is directly connected

to the internal GM amplifier.

7.3 Feature Description

7.3.1 Undervoltage Lockout

The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the

converter from turning on the switch or rectifier MOSFET under undefined conditions.

7.3.2 Dynamic Voltage Positioning

As described in the power save mode operation sections and as detailed in Figure 4, the output voltage is

typically 0.8% above the nominal output voltage at light load currents, as the device is in power save mode. This

gives additional headroom for the voltage drop during a load transient from light load to full load. During a load

transient from full load to light load, the voltage overshoot is also minimized due to active regulation turning on

the N-channel rectifier switch.

8

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