TPS65235-1RUKR datasheet(8/39 Pages) TI1

Part #	TPS65235-1RUKR

Description	LNB Voltage Regulator With I2C Interface

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Manufacturer	TI1 [Texas Instruments]

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PWM Controller

Tone

Generator

REF_Boost

I

2C Interface

REF

REF_Boost

REF_LDO

TCAP

Internal Regulator

VCC

SDA

SCL

Fault Diagnose

OCP

OTP

PGOOD

I2C EN

EN

BOOST

VLNB

VCTRL

Charge Pump

VCP

EN

Logic

ADDR

GDR

DIN

Tone

Det

VLNB

Tone_Auto

Tone_Trans

EXTM

PGND

8

TPS65235-1

SLVSDP1 – JANUARY 2017

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7 Detailed Description

7.1 Overview

TPS65235-1 is the Power management IC that integrates a boost converter, a LDO and a 22 kHz tone generator

to serve as a LNB power supply. This solution compiles the DiSEqC 2.x standard with or without I2C interface.

Output current limitation can be precisely programmed by an external resistor. There are two ways to generate

the 22 kHz tone signal, with or without I2C. Integrated boost features low Rds(on) MOSFET and internal

compensation. 1 MHz or 500 kHz selectable switching frequency is designed to save passive components size

and be flexible for design.

TPS65235-1 can support the 44-kHz tone output, when the EXTM has 44-kHz tone input, and the bit EXTM

TONE of Control Register 1 is set to “1”, the LNB tone output is 44 kHz. By default, the TPS65235-1 has a

typical 22-kHz tone output.

7.2 Functional Block Diagram

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