Sharp QT-V5E Service Manual page 29

IC203 9HX06830480284: DC-DC Converter (IRU3048CS)
Vcc 9
25uA
SS 15
POR
25K
1.25V
25K
Fb1 16
Comp1 3
25K
1.25V
25K
Fb2 2
Comp2 4
25K
1.25V
25K
Fb3 14
Gnd 1
64uA Max
4.2V / 4.0V
3.5V / 3.3V
VcH1
3.5V / 3.3V
VcH2
PWM Comp1
Error Amp1
Ramp1
Two Phase
Oscillator
Ramp2
PWM Comp2
Error Amp2
0.5V
Vcc
40mA LDO Controller
Figure 6-2 BLOCK DIAGRAM OF IC
6 – 2
3V
Bias
Generator
1.25V
POR
UVLO
R
Q
S
Reset Dom
Set1
Set2
S
Q
R
Reset Dom
POR
2V
SS
QT-V5E/QT-V5H
12 VcH1
11 HDrv1
10
LDrv1
5 VcH2
SS > 2V
6
HDrv2
7 LDrv2
8 PGnd
V
13 OUT3