Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
Functional Block Diagram
VCC
2
UVLO
pro
OVP
&
6
5
VDD
OCkP
FB
Regulator
UVLO
&
Bias
0.1V
COMP
Tonsec
Tons
Detector
7
3
pfm
BIAS
OUT
EA
Vea
V+
S&H
4.0V
Tons
COMP
pfm
CV_ctrl
R
S
Q
Driver
pfm_d
V+
Vea
1
t
CS
COMP
COMP
0.5V
pfm
pfm_d
LEB Delay
430ns
0.46V
VDD
I
Tons
8
4
CC_ctrl
COMP
R
S
Q
3.75V
COMP
GND
0.75*I
Figure 3. Functional Block Diagram of AP3706
Jul. 2008 Rev. 1.3
BCD Semiconductor Manufacturing Limited
3