R03DS0031EJ0300 Rev.3.00

Page 1 of 12

Mar 11, 2011

Preliminary Datasheet

R2A20124AFP/R2A20124ASP

Synchronous Phase Shift Full-Bridge Control IC Series

Description

The R2A20124AFP/R2A20124ASP controls a full-bridge phase shift circuit and secondary synchronous rectification.

The R2A20124AFP/R2A20124ASP has adjustable delay time functions which make ZVS of primary side and make

loss of body diode of primary switching device minimal.

The R2A20124AFP/R2A20124ASP is based on HA16163/R2A20121. And RAMP slope compensation circuit is built-

in as an additional function. Also its output driver circuits are improved to enlarge gate drive output voltage swing from

VREF to VCC.

In addition R2A20124AFP has ON/OFF function of synchronous rectification and includes amplifier which detect input

current signal.

Features

 Maximum ratings

 Supply voltage Vcc: 20 V

 Operating junction temperature Tj-opr: –40 to +125°C

 Electrical characteristics

 VFB feedback voltage VFB(–): 1.25 V  2.0%

 UVLO (Under Voltage Lockout) operation start voltage VH: 8.4 V  0.7 V

 UVLO operation shutdown voltage VL: 8.0 V  0.6 V

 UVLO hysteresis voltage dVUVL: 0.4 V  0.1 V

 Output voltage swing of OUT-A, B, C, D, and E for gate drive: GND to VCC

 Functions

R2A20124AFP/R2A20124ASP

 Full-bridge phase-shift switching circuit with adjustable delay times

 Pulse by pulse current limit

 Synchronization I/O for the oscillator

 Ramp sloping adjustor

 Error amplifier built-in

 Soft start function

R2A20124AFP

 Synchronous rectification on/off control

 Remote on/off control

 Amplified output of current sense input voltage: CS

 Package lineup

 Pb-free LQFP-40: R2A20124AFP

 Pb-free SOP-20: R2A20124ASP

Ordering Information

Part No.

Package Name

Package Code

Taping Spec.

R2A20124AFP-W0

2000 pcs./one taping product

R2A20124AFP-W5

2000 pcs./one taping product

R2A20124AFP-U0

—

R2A20124AFP-U5

FP-40EV

PLQP0040JB-C

—

R2A20124ASP-W0

2000 pcs./one taping product

R2A20124ASP-W5

2000 pcs./one taping product

R2A20124ASP-U0

—

R2A20124ASP-U5

FP-20DAV

PRSP0020DD-B

—

R03DS0031EJ0300

Rev.3.00

Mar 11, 2011