Datasheet > RT6200

RT6200

更新时间： 2024-04-09 19:02:36

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
12页	255K
描述
0.6A, 36V, 1.2MHz Step-Down Converter

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数据手册

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RT6200 数据手册

RT6200

Function Block Diagram

VIN

X20

1µA

Current Sense Amp

45mΩ

Ramp

Generator

Regulator

BOOT

1.1V

10k

Oscillator

1.2MHz

Shutdown

Comparator

Reference

Driver

PHASE

PWM

Comparator

30pF

Bootstrap

Control

400k

OC Limit Clamp

GND

2pF

Operation

The RT6200 is a constant frequency, current mode

asynchronous step-down converter. In normal operation,

the high sideN-MOSFET is turned on when the S-R latch

is set by the oscillator and is turned off when the current

comparator resets the S-R latch. While the N-MOSFET

is turned off, the inductor current conducts through the

external diode.

Internal Regulator

The regulator provides low voltage power to supply the

internal control circuits and the bootstrap power for high-

side gate driver.

Enable

The converter is turned on when the ENpin is higher than

1.2V and turned off when the EN pin is lower than 0.94V.

When the EN pin is open, it will be pulled up to logic-high

by 1μA current internally.

Error Amplifier

The error amplifier adjusts its output voltage by comparing

the feedback signal (V_FB) with the internal 0.8V reference.

When the load current increases, it causes a drop in the

feedback voltage relative to the reference, the error

amplifier's output voltage then rises to allow higher inductor

current to match the load current.

Soft-Start (SS)

An internal current source charges an internal capacitor

to build a soft-start ramp voltage. The FB voltage will track

the internal ramp voltage during soft-start interval. The

typical soft-start time is 700μs.

Oscillator

Thermal Shutdown

The internal oscillator runs at fixed frequency 1.2MHz.

The RT6200 can support duty up to 95% by decreasing

switching frequency to 600kHz. In short circuit condition,

the frequency is reduced for low power consumption.

The over temperature protection function will shut down

the switching operation when the junction temperature

exceeds 150°C. Once the junction temperature cools

down by approximately 20°C, the converter will

automatically resume switching.

is a registered trademark of Richtek Technology Corporation.

DS6200-04 August 2015

www.richtek.com

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