Preliminary Datasheet
R2A20124AFP/R2A20124ASP
REJ03D0928-0200
Synchronous Phase Shift Full-Bridge Control IC Series
Rev.2.00
Aug 03, 2010
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.
R2A20124AFP-W0
R2A20124AFP-W5
R2A20124AFP-U0
R2A20124AFP-U5
R2A20124ASP-W0
R2A20124ASP-W5
R2A20124ASP-U0
R2A20124ASP-U5
Package Name
FP-40EV
FP-20DAV
Package Code
PLQP0040JB-C
PRSP0020DD-B
Taping Spec.
2000 pcs./one taping product
2000 pcs./one taping product
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2000 pcs./one taping product
2000 pcs./one taping product
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REJ03D0928-0200 Rev.2.00
Aug 03, 2010
www.DataSheet.in
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