rectification controller. SRK2001 Datasheet


SRK2001 controller. Datasheet pdf. Equivalent


Part Number

SRK2001

Description

Adaptive synchronous rectification controller

Manufacture

STMicroelectronics

Total Page 21 Pages
Datasheet
Download SRK2001 Datasheet


SRK2001
SRK2001
Adaptive synchronous rectification controller for LLC resonant
converter
Datasheet - production data
80+/85+ compliant ATX SMPS
90+/92+ compliant SERVER SMPS
Industrial SMPS
SSOP10
Features
Secondary side synchronous rectification
controller optimized for LLC resonant converter
Dual gate driver for N-channel MOSFETs
Adaptive turn-off logic
Turn-on logic with adaptive masking time
Auto-compensation of parasitic inductance
Low consumption mode: 50 ϤA quiescent
current
VCC operating voltage range 4.5 to 32 V
High voltage drain-to-source Kelvin sensing for
each SR MOSFET
Operating frequency up to 500 kHz
35 ns total delay at turn-off
Protection against current reversal
Safe management of load transient, light-load
and startup conditions
Intelligent automatic sleep mode at light-load
with user programmable enter/exit load levels,
with soft transitions and function disable
Programmable exit load levels from burst mode
Compatible with standard level MOSFETs
SSOP10 package
Applications
AC-DC adapters
All-in -one PC
High-end flat panel TV
Description
The SRK2001 controller implements a control
scheme specific for 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 interlock logic circuit prevents
the two synchronous rectifier MOSFETs from
conducting simultaneously.
The control scheme in this IC provides for each
synchronous rectifier being switched on as the
corresponding half-winding starts conducting and
switched off as its current goes to zero.
The innovative turn-on logic with adaptive
masking time and the adaptive turn-off logic
allows maximizing the conduction time of the SR
MOSFETs eliminating the need of the parasitic
inductance compensation circuit.
The low consumption mode of the device allows
to meet the most stringent requirement for
converter power consumption in light-load/no load
conditions.
A noticeable feature is the very low external
component count required.
Table 1. Device summary
Order code
Package
Packing
SRK2001
SRK2001TR
SSOP10
Tube
Tape and reel
September 2018
This is information on a product in full production.
DS10811 Rev 5
1/21
www.st.com

SRK2001
Contents
Contents
SRK2001
1 Block diagrams and pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Operation description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1 Drain voltage sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.2 Turn-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.3 Turn-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.4 ZCD comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.5 Gate drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.6 Intelligent automatic sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.7 Burst mode operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.8 EN and PROG pins: function and usage . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.8.1 Automatic sleep mode function enabled . . . . . . . . . . . . . . . . . . . . . . . . 15
5.8.2 Automatic sleep mode function disabled . . . . . . . . . . . . . . . . . . . . . . . . 16
5.9 Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.1 SSOP10 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21 DS10811 Rev 5


Features SRK2001 Adaptive synchronous rectificat ion controller for LLC resonant convert er Datasheet - production data  80+ /85+ compliant ATX SMPS  90+/92+ com pliant SERVER SMPS  Industrial SMPS SSOP10 Features  Secondary side syn chronous rectification controller optim ized for LLC resonant converter  Dua l gate driver for N-channel MOSFETs  Adaptive turn-off logic  Turn-on lo gic with adaptive masking time  Auto -compensation of parasitic inductance Low consumption mode: 50 ϤA quiesce nt current  VCC operating voltage ra nge 4.5 to 32 V  High voltage drain- to-source Kelvin sensing for each SR MO SFET  Operating frequency up to 500 kHz  35 ns total delay at turn-off Protection against current reversal  Safe management of load transient, light-load and startup conditions  I ntelligent automatic sleep mode at ligh t-load with user programmable enter/exi t load levels, with soft transitions an d function disable  Programmable exit load levels from burst mode  Compatible with standard le.
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