Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER AP1680
General Description Features
The AP1680 is a high performance AC/DC power sup-
Primary Side Control for Rectangular Constant
ply controller for LED drivers, battery charger and
Current and Constant Voltage Output
adapter applications. The device uses Pulse Frequency
Sub-microampere Start-up Current
Modulation (PFM) method to build discontinuous con-
30mW No-load Input Power Feasible
duction mode (DCM) flyback power supplies.
Tight CC Regulation Performance
Eliminates Opto-coupler and Secondary CV/CC
The AP1680 provides accurate constant voltage, con-
Control Circuitry
stant current (CV/CC) regulation while removing the
Eliminates Control Loop Compensation Circuitry
opto-coupler and secondary control circuitry. It also
Flyback Topology in DCM Operation
eliminates the need of loop compensation circuitry
Random Frequency Modulation to Reduce
while maintaining stability. The AP1680 achieves
System EMI
excellent regulation and high average efficiency, yet
meets the requirement for no-load consumption less Built-in Soft Start
than 30mW.
Open Feedback Protection
Short Circuit Protection
The AP1680 is available in SOT-23-6 package.
SOT-23-6 Package
Applications
LED Drivers
Adapters/Chargers for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
Standby and Auxiliary Power Supplies
SOT-23-6
Figure 1. Package Type of AP1680
Apr. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
1 Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER AP1680
Pin Configuration
K6 Package
(SOT-23-6)
Pin 1 Dot by Marking
OUT
6 FB
1
GND
GND 5
2
VCC CS
34
Figure 2. Pin Configuration of AP1680 (Top View)
Pin Description
Pin Number Pin Name Function
1 OUT This pin drives the base of external power NPN switch
2, 5 GND
Ground
3 VCC Supply voltage
4 CS The primary current sense
6 FB The voltage feedback from the auxiliary winding
Apr. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
2