Diodes AP1684 - Manual (Page 2)

AP1684
Document number: DS36547 Rev. 3 - 2
2 of 13
www.diodes.com
February 2014
© Diodes Incorporated
AP1684
A Product Line of
Diodes Incorporated
Pin Descriptions
Pin Number Pin Name Function
1 NC No connection
2 RI The initial Tonp tuning resistor
3 RM Set the operating mode
4 CS Primary current sensing
5 FB The feedback voltage sensing from the auxiliary winding
6 GND Ground
7 OUT Gate driver output
8 VCC Supply voltage of gate driver and control circuits of the IC
Functional Block Diagram
Regulator &
Bias
Tons
Detector
Tons
Power_EN
Driver
FB
VCC
OUT
PFM
R
S
Q
Vref
CC_CTRL
TONP_CTRL
CS
GND
Vdd
Protection
& Latch
PRO
CS_OCP
FB_CV
FB_OVP
VCC_OVP
Logic
Set Initial Tonp
& Set the IC
Working in BCM RM
RI
Constant Turn-on Time
Generation
5
2
3
4
6
7
8