IFBx Voltage

Detection / OVP

D1

VBAT

Slope

Compensation

S

R

Q

Vref

PWM

SW

EA

R1

63.4k

ISET

VIN

Current Sink 1

SW OVP

GND

IFB1

IFB2

C1

1µF

VOUT

L1

GM

Duty Decoding

Current Sink 2

Analog Dimming Control

OCP

S

Enable / Disable

Detection

EN

COMP

C4

330nF

Shutdown

Control

UVLO /

Internal Regulator

R2

10

C3

1µF

C2

1µF

Comp

OSC

120mV

OPAMP

COMP clamp circuit

SW OVP

UVLO

Vclamp

Dual-Channel

Current Sinks

TPS61162A, TPS61163A

SLVSC26A – NOVEMBER 2013 – REVISED JUNE 2015

www.ti.com

7 Detailed Description

7.1 Overview

The TPS61162A, TPS61163A is a high-efficiency, dual-channel white LED driver for smart-phone backlighting

applications.

Two

current

sink

regulators

of

high

current-matching

capability

are

integrated

in

the

TPS61162A,TPS61163A to support dual LED strings connection and to improve the current balance and protect

the LED diodes when either LED string is open or short.

The TPS61162A, TPS61163A has integrated all of the key function blocks to power and control up to 20 white

LED diodes. It includes a 1.5-A, 40-V boost converter, two current-sink regulators, and protection circuit for

overcurrent, overvoltage, and thermal shutdown protection.

In order to provide high brightness backlighting for large size or high resolution smart phone panels, more and

more white LED diodes are used. Having all LED diodes in a string improves overall current matching; however,

the output voltage of a boost converter will be limited when input voltage is low, and normally the efficiency will

drop when output voltage goes very high. Thus, the LED diodes are arranged in two parallel strings.

7.2 Functional Block Diagram

8

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