Diodes AP1680 - Manual

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