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Monolithic Power Switcher for Off-line SMPS AP3968/69/70
Dec. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
1
General Description
The AP3968/69/70 consists of a primary side
regulation controller and a high voltage transistor,
and is specially designed for off-line power supplies
within 12W output power. Typical applications
include adapter for ADSL and auxiliary supplies.
The AP3968/69/70 operates at pulse frequency
modulation (PFM), and provides accurate constant
voltage, constant current (CV/CC) regulation without
requiring an opto-coupler and secondary control
circuitry. It has internal cable compensation function
for tight constant voltage regulation.
The AP3968/69/70 solution has fewer component
numbers, smaller size, and lower total cost.
The package of AP3968 is SOIC-7 and AP3969/70 is
DIP-8.
Features
• Primary Side Control for Eliminating
Opto-coupler and Secondary CV/CC Control
Circuitry
• Built-in NPN Transistor with 700VCBO
• Low Start-up Current: 0.2μA (Typ.)
• Internal Output Cable Voltage Drop
Compensation
• Random Frequency Modulation for Low EMI
• Short Circuit Protection
• Low Total Cost Solution
• Output Power Range (Note 1):
AP3968 for 4.5W Adapter
AP3969 for 7.5W Adapter
AP3970 for 12W Adapter
Note 1: Typical continuous power in a non-ventilated
enclosed adapter measured at 50ºC ambient.
Applications
• Chargers
• Adapters
• Set Top Boxes
• Auxiliary Supplies
• DVD
• LED Driver