NCP1236 65W Laptop Offline Adapter Application Circuit

Photocoupler

NCP1236 is a new fixed-frequency current mode controller with dynamic self-supplied power supply (DSS), which simplifies the design of auxiliary power supply, adjustable over-power compensation, VCC operation up to 28V and pressure detection. Drive capability 500mA, soft start time 4.0ms, internal thermal shutdown. Mainly used in laptops, LCD and printer AC / DC adapters, offline battery chargers, consumer electronic power supplies, etc.

Typical applications for NCP1236:

AC−DC Adapters for Notebooks, LCD, and Printers

Offline Battery Chargers

Consumer Electronic Power Supplies

Auxiliary/Housekeeping Power Supplies

Figure 1. Simplified block diagram of NCP1236

Figure 2. Flyback converter with NCP1236