SW

Ramp

Generator

Oscillator

Current

Sensor

EN

PGND

C4

L1

+

EA

R2

C2

VIN

Copyright © 2016,Texas Instruments Incorporated

COMP

R1

R3

R4

C3

SS

FREQ

SYNC

FB

FB

Gate

Driver

C1

AGND

D1

1.229 V

Reference

PWM Control

9

TPS61175-Q1

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SLVSCN9A – DECEMBER 2014 – REVISED APRIL 2016

Product Folder Links: TPS61175-Q1

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Copyright © 2014–2016, Texas Instruments Incorporated

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Switching Frequency

The switch frequency is set by a resistor (R4) connected to the FREQ pin of the TPS61175-Q1. Do not leave this

pin open. A resistor must always be connected for proper operation. See Table 1 and Figure 7 for resistor values

and corresponding frequencies.

Table 1. Switching Frequency vs External Resistor

R4 (k

Ω)

443

240

256

400

176

600

80

1200

51

2000