D1

SW

Ramp

Generator

Oscillator

Current

Sensor

OLP

CTRL

GND

C3

L1

+

FB

Reference

Control

Error

Amplifer

2

1

Rset

C2

Vin

C1

PWM Control

4

6

5

3

COMP

Soft

Start-up

Copyright © 2016, Texas Instruments Incorporated

8

TPS61165

SLVS790D – NOVEMBER 2007 – REVISED APRIL 2016

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Product Folder Links: TPS61165

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Copyright © 2007–2016, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The TPS61165 is a high-efficiency, high-output-voltage boost converter in small package size. The device is

ideal for driving white LEDs in series. The serial LED connection provides even illumination by sourcing the same

output current through all LEDs, eliminating the need for expensive factory calibration. The device integrates 40-

V/1.2-A switch FET and operates in pulse width modulation (PWM) with 1.2-MHz fixed switching frequency. (For

operation see the Functional Block Diagram.) The duty cycle of the converter is set by the error amplifier output

and the current signal applied to the PWM control comparator. The control architecture is based on traditional

current-mode control; therefore, slope compensation is added to the current signal to allow stable operation for

duty cycles larger than 40%. The feedback loop regulates the FB pin to a low reference voltage (200 mV typical),

reducing the power dissipation in the current sense resistor.

8.2 Functional Block Diagram