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R2A20121SP Datasheet

Synchronous Phase Shift Full-Bridge Control IC

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R2A20121SP
Synchronous Phase Shift Full-Bridge Control IC
Features
High frequency operation; oscillator frequency = 2 MHz Max
Full-bridge phase-shift switching circuit with adjustable delay times
Integrated secondary synchronous rectification control with adjustable delay times
Pulse by pulse current limit
Package: TSSOP-20
Illustrative Circuit
VIN
DC 5 V DC 5 V
Vbias
(DC 12 V)
DC 5 V
DC 5 V
DC 5 V
REJ03D0914-0100
Rev.1.00
Sep 29, 2008
Vout
+
VCC OUT OUT CS RAMP
-A -B
OUT
-C
OUT OUT OUT
-D -E -F
VREF
R2A20121
COMP
FB ()
DELAY DELAY DELAY
GND RT SYNC SS FB (+) -1 -2 -3
HAT3043C
HAT3042C
HAT3004R
Note: The above circuit is reference example. Please confirm the operation when designing the system.
REJ03D0914-0100 Rev.1.00 Sep 29, 2008
Page 1 of 27
www.DataSheet.in


Renesas Electronics Components Datasheet

R2A20121SP Datasheet

Synchronous Phase Shift Full-Bridge Control IC

No Preview Available !

R2A20121SP
Pin Arrangement
SYNC
RAMP
CS
COMP
FB (+)
FB ()
SS
DELAY-1
DELAY-2
DELAY-3
1
2
3
4
5
6
7
8
9
10
20 RT
19 GND
18 OUT-A
17 OUT-B
16 OUT-C
15 OUT-D
14 OUT-E
13 OUT-F
12 VCC
11 VREF
(Top view)
Pin Functions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin Name
SYNC
RAMP
CS
COMP
FB (+)
FB (–)
SS
DELAY-1
DELAY-2
DELAY-3
VREF
VCC
OUT-F
OUT-E
OUT-D
OUT-C
OUT-B
OUT-A
GND
RT
Function
Synchronization I/O for the oscillator
Current sense signal input for the full-bridge control loop
Current sense signal input for OCP
Error amplifier output
Error amplifier plus input
Error amplifier minus input
Timing capacitor for soft-start
Delay time adjustor for the full-bridge control signal (OUT-A and B)
Delay time adjustor for the full-bridge control signal (OUT-C and D)
Delay time adjustor for the secondary control signal (OUT-E and F)
5 V/20 mA Output
IC power supply input
Secondary control signal
Secondary control signal
Full-bridge control signal
Full-bridge control signal
Full-bridge control signal
Full-bridge control signal
Ground level for the IC
Timing resistor for the oscillator
REJ03D0914-0100 Rev.1.00 Sep 29, 2008
Page 2 of 27
www.DataSheet.in


Part Number R2A20121SP
Description Synchronous Phase Shift Full-Bridge Control IC
Maker Renesas Technology
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