SRK2000DTR(2012) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

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SRK2000DTR
(Rev.:2012)

Synchronous rectifier smart driver for LLC resonant converters

STMicroelectronics 

SRK2000

Synchronous rectifier smart driver for LLC resonant converters

Features

■ Secondary-side synchronous rectifier

controller optimized for LLC resonant

converters

■ Protection against current reversal

■ Safe management of load transient, light load

and startup condition

■ Intelligent automatic sleep-mode at light load

■ Dual gate driver for N-channel MOSFETs with

1 A source and 3.5 A sink drive current

■ Operating voltage range 4.5 to 32 V

■ Programmable UVLO with hysteresis

■ 250 µA quiescent consumption

■ Operating frequency up to 500 kHz

■ SO8 package

Applications

■ All-in-one PC

■ High-power AC-DC adapters

■ 80+/85+ compliant ATX SMPS

■ 90+/92+ compliant server SMPS

■ Industrial SMPS

Description

SO-8

corresponding half-winding starts conducting and

switched off as its current goes to zero. A unique

feature of this IC is its intelligent automatic sleep-

mode. It allows the detection of a low-power

operating condition for the converter and puts the

IC into a low consumption sleep-mode where gate

driving is stopped and quiescent consumption is

reduced. In this way, converter efficiency

improves at light load, where synchronous

rectification is no longer beneficial. The IC

automatically exits sleep-mode and restarts

switching as it recognizes that the load for the

converter has increased.

A noticeable feature is the very low external

component count required.

Figure 1. Internal block diagram

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The SRK2000 smart driver implements a control

scheme specific to secondary-side synchronous

rectification in LLC resonant converters that use a

transformer with center-tap secondary winding for

full-wave rectification.

It provides two high-current gate-drive outputs,

each capable of driving one or more N-channel

Power MOSFETs. Each gate driver is controlled

separately and an interlocking logic circuit

prevents the two synchronous rectifier MOSFETs

from conducting simultaneously.

The control scheme in this IC allows for each

synchronous rectifier to be switched on as the

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Table 1. Device summary

Order code

Package

SRK2000D

SRK2000DTR

SO-8

Packing

Tube

Tape and reel

February 2012

Doc ID 17811 Rev 2

1/17

www.st.com

17

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