STEVAL-ISA168V1 Datasheet SRK2001, SRK2001TR, SRK2001LTR | P1-P3

This is information on a product in full production.

February 2017 DocID027367 Rev 4 1/20

SRK2001

Adaptive synchronous rectification controller for LLC resonant

converter

Datasheet - production data

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 µA quiescent

current

 V

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

 80+/85+ compliant ATX SMPS

 90+/92+ compliant SERVER SMPS

 Industrial SMPS

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.

SSOP10

Table 1. Ordering codes

Package Packing Standard gate MOSFETs

SSOP10

Tube SRK2001

Tape and reel SRK2001TR

www.st.com

Contents SRK2001

2/20 DocID027367 Rev 4

Contents

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 EN and PROG pins: function and usage . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.7.1 Automatic sleep mode function enabled . . . . . . . . . . . . . . . . . . . . . . . . 15

5.7.2 Automatic sleep mode function disabled . . . . . . . . . . . . . . . . . . . . . . . . 15

5.8 Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.1 SSOP10 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

DocID027367 Rev 4 3/20

SRK2001 Block diagrams and pin connections

1 Block diagrams and pin connections

Figure 1. Internal block diagram

Figure 2. Typical system block diagram

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P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P20

STEVAL-ISA168V1

Mfr. #:

Buy STEVAL-ISA168V1

Manufacturer:

STMicroelectronics

Description:

Power Management IC Development Tools Evaluation board: SRK2001 adaptive synchronous rectification controller for LLC resonant converters with STL140N4LLF5

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