Diodes AP1686 - Manual (Page 3)

Preliminary Datasheet
Low-Power Off-line PSR LED Controller AP1686
Nov. 2012 Rev. 1.1 BCD Semiconductor Manufacturing Limited
3
Functional Block Diagram
Regulator
&
Bias
OVP
&
OCKP
PFM
T
ONS
UVLO
UVLO
CV_ctrl
PFM
Driver
R Q
S
R Q
S
CC_ctrl
FB
CS
VCC
OUT
GND
Constant Voltage
Control
Constant Current
Control
Tonsec
Detector
0.1V
V
FB
4
3
1
2,5
6
PRO
V
REF1
COMP
EA
Peak Current
Control & LEB
T
ONS
Pro
CC_ctrl
V
REF2
Shutdown
Pre_Shutdown
Line
Compensation
Figure 3. Functional Block Diagram of AP1686