Sanyo DP26648 Service Manual - Page 31
Ic Block Diagrams Cont.
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IC BLOCK DIAGRAMS (CONT.) IC1600, DC to DC Converter VREF DT1 FB1 SS1 1NV1 CT 1NV2 SS2 FB2 DT2 VREF VCC REG (2.5V) STB OCP1- OCP1- VCC STB MASTER /SLAVE Muster mode latch + - UVLO VCC VCC OCP1 + ERR 2.8V - 50mVV± 10mV REC C5V (VCC-5V) DT1OFF DT1Low DT C5V CSV + - VREF 2μA SS1OFF 1V± 10mV + + ERR - 200μA +-- 200μA OSC 2.0V 1.5V` MASTER /SLAVE 2V 1.5V VREF 2μA - SS2OFF +ERR + 1V± 10mV 1.25V + + ERR LS - PROTECTION LOGIC DT1Low OCP1 Hold time (1.6 msec) SS1OFF DT10FF VCC DRV C5V TSD TSD OUT1 OVLO TSD OCP2 Hold time (0.2 msec) Hold time (1.6 msec) DT2Low DT20FF VCC VREF C5V 3.2V 2.2V 3V UVLO UVLO SS2OFF VCC - + PWM + DT2OFF - DT2Low DT + 1,25V LS VCC OCP2 - OCP + 50V± 10mV C5V DRV C5V OUT2 OCP2- OCP2- GND - 31 -
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— 31 —
IC BLOCK DIAGRAMS (CONT.)
VCC
C5V
VCC
TSD
TSD
UVLO
UVLO
GND
OUT2
OUT1
CSV
OCP1- OCP1-
OCP2- OCP2-
STB
VREF
DT1
FB1
SS1
1NV1
CT
1NV2
SS2
FB2
DT2
C5V
VCC
C5V
VCC
VREF
C5V
3.2V
2.2V
3V
OCP2
DT2OFF
DT2Low
1,25V
VCC
DRV
REC
(VCC-5V)
LS
C5V
OCP1
VCC
C5V
Hold time
(0.2 msec)
Hold time
(1.6 msec)
Hold time
(1.6 msec)
OCP1
SS1OFF
VREF
2μA
200μA
200μA
1V± 10mV
1V± 10mV
50V± 10mV
50mVV± 10mV
VREF
MASTER
/SLAVE
Muster
mode
latch
REG
(2.5V)
UVLO
DT1OFF
STB
1.25V
2.8V
DT1Low
OVLO
TSD
OCP2
MASTER
/SLAVE
2.0V
1.5V`
DT2Low
DT1Low
SS1OFF
DT10FF
DT20FF
SS2OFF
PROTECTION LOGIC
OSC
VCC
VCC
SS2OFF
VREF
2μA
ERR
ERR
ERR
DT
ERR
LS
DT
OCP
DRV
PWM
2V
1.5V
–
+
+
–
+
+
+
+
–
+
+
–
+
–
–
+
–
+
–
+
–
–
+
–
+
IC1600, DC to DC Converter