R2A20121SP Ver la hoja de datos (PDF) - Renesas Electronics
Número de pieza
componentes Descripción
fabricante
R2A20121SP Datasheet PDF : 28 Pages
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R2A20121SP
Block Diagram
VCC
H
UVLO
UVL
L
VCC > 8.4 V→High
5V
GENERATOR
VREF H
GOOD L
VREF > 4.6 V→High
VREF
VREF
RT
Current Ref.
Generator
START-UP
COUNTER
32 CLOCK
SYNC SYNC. I/O
OSCILLATOR
RES
Q
ERROR AMP
VREF
FB (−)
− 500 µ
R
+
SQ
FB (+)
COMPARATOR
COMP
−
+
RAMP
1.135 V
CLAMP CIRCUIT
VREF
1.55 V
1.46 V
VREF GOOD
DELAY
DELAY
DELAY
DELAY
CIRCUIT
BIAS
VREF
VREF
VREF
OUT-A
DELAY-1
OUT-B
OUT-C
VREF
DELAY-2
OUT-D
VREF GOOD
R
Q
S
4V
Zero Delay
10 µ
SS
VREF GOOD
PULSE BY PULSE
CS
+
1.4 V −
DELAY
Zero Delay
DELAY
VREF
VREF
OUT-E
DELAY-3
OUT-F
GND
Note: Note that all switches in the block diagram are turned on when control signal is high.
REJ03D0914-0100 Rev.1.00 Sep 29, 2008
Page 3 of 27
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