The OB2223AP is a current mode PWM controller IC used in offline AC-DC switch mode power supplies (SMPS). It typically comes in a DIP-8 package and is designed for low standby power and high efficiency applications.

Here are the key details:

Basic Information

• Part number: OB2223AP

• Package: DIP-8 (through-hole, 8 pins)

• Type: Highly integrated, current-mode PWM controller

• Application: AC-DC switching power supply, charger, adapter, standby power

Features

• PWM control with cycle-by-cycle current limiting

• Low standby power (green-mode operation)

• Built-in slope compensation for better stability

• Over-voltage protection (OVP) and under-voltage lockout (UVLO)

• Over-temperature protection (OTP) (usually with external components)

• Low start-up current

• Supports constant voltage / constant current (CV/CC) regulation

Typical Applications

• Mobile phone chargers

• Power adapters for consumer electronics

• Small SMPS (e.g., < 25W)

• Standby power supplies for appliances

Pin Configuration (DIP-8)

1. GND – Ground

2. FB – Feedback input

3. CS – Current sense input

4. RT – Oscillator frequency setting

5. GATE/OUT – Drive output for MOSFET

6. VDD – Supply voltage

7. NC – Not connected (depends on variant)

8. HV / VCC – High voltage startup or supply pin (depending on package/variant)