Circuit Design of 65W Laptop Adapter Based on TOP259EN

Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

Photocoupler

Summary:

The power supply design uses the TOP259EN device. The TOPSwitch-HX product family integrates a 700 V MOSFET with a multifunction PWM controller in the same device. The optimized combination of switching MOSFETs and integrated drivers with low switching losses allows the compact, high-efficiency 65 W notebook power supply to operate safely in a hermetic enclosure at ambient temperatures up to 40 °C.

The bridge rectifier BR1 at the power input rectifies the input voltage; the electrolytic capacitor C2 filters the input voltage. Fuse F1 provides severe fault protection. Common mode EMI is filtered by L1, L2, L3, C3, and C11. The common mode chokes L2 and L3 respectively filter the low frequency and the high frequency. Differential mode filtering is provided by the leakage inductance of L2 and the X capacitor C1. Since the capacitance of C1 is greater than 0.1 μF, discharge resistors R1 and R2 need to discharge C1 after the AC input is disconnected. C5 decouples the primary switching current to reduce the generation of differential mode EMI.

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