Description
The AP3710 is a green-mode PWM controller, its main
applications are low power supplies such as offline battery
chargers, adapters, STB and other auxiliary supplies,
where the needs for low no load power, low total cost and
high reliability are all required.
The functional blocks of AP3710 include: under voltage
lockout with low start-up current; precise voltage reference
for internal comparators; PWM comparator with current
limit control, feedback signal and bandgap input;
short circuit comparator and open circuit protection for
opto-coupler.
The AP3710 operates at a fixed 60kHz switching frequency,
its output connects to the emitter of high voltage
NPN transistor or the source of MOSFET. In normal
mode, it works as a switch to turn on or turn off the
external transistor. In failure modes like open loop, over
voltage or overload due to short circuit, the chip enters
into an auto restart mode controlled by the internal protection
unit.
Features
· Current Mode Control with Skip Cycle Capability
· Low Start-up Current: 0.25 mA
· Low Operating Current: 0.45mA
· Output Current Capacity: 900 mA
· Fixed Switching Frequency: 60 kHz
· Frequency Dithering for Low EMI
· Under-Voltage Lockout with Hysteresis
· Built-in Slope Compensation
· Short Circuit Protection
· Open and Short Circuit Protection for Opto-Coupler
· Maximum Input Power is 0.2W under No Load
· Maximum Input Power is 1W under 0.5W Load
· Low Total Cost Solution
Applications
· Adapters
· Battery Chargers
· Set Top Boxes
· Auxiliary Supplies
· DVD
Benefits
· Better Electrical performances
· Low total cost
Parametric Table
Switching Frequency (kHZ) 60
Startup Current (μA) 250
Operating Current (μA) 450
Package SOIC-8
DIP-8
Additional Available Materials
· Samples
· Preliminary Datasheet
· ESD Report
· Demo Board
· Application Note