AP3968 Datasheet, PDF (1/15 Pages) BCD Semiconductor Manufacturing Limited – Primary Side Power Switcher for Off-line SMPS Low Total Cost Solution

Preliminary Datasheet
Primary Side Power Switcher for Off-line SMPS
AP3968/69/70/70S
General Description
The AP3968/69/70/70S 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 AP3968/69/70/70S 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 AP3968/69/70/70S solution has fewer
component numbers, smaller size, and lower total
cost.
The AP3968 is packaged in SOIC-7. The
AP3969/70/70S is packaged in DIP-7 and DIP-8.
Features
• Primary Side Control for Eliminating
Opto-coupler and Secondary CV/CC Control
Circuitry
• Built-in NPN Transistor with 700V_CBO
• 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 5W Adapter
AP3969 for 7.5W Adapter
AP3970 for 12W Adapter
AP3970S for 10W 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
SOIC-7
DIP-7
DIP-8
Dec. 2011 Rev. 1. 4
Figure 1. Package Types of AP3968/69/70/70S
BCD Semiconductor Manufacturing Limited
1