NCP1397AG IC Working and Pinout | Full Testing Guide

In this video, we explain NCP1397AG IC working, pinout, and testing method in simple language. NCP1397AG is a high-performance resonant mode controller IC commonly used in LCD TV, LED TV, and high-power SMPS circuits.

Topics Covered:

What is NCP1397AG IC?

Internal working principle

Resonant (LLC) converter basic explanation

Pin configuration details

Startup and VCC operation

Driver output pins explanation

Protection features (OCP, OVP, Brown-out)

Step-by-step testing method

Common faults in TV SMPS

This video is very helpful for TV repair technicians and advanced SMPS learners.
Basic Testing Guide

✔ Check VCC supply (usually 12–18V depending on design)
✔ Check startup resistor from bulk capacitor
✔ Check HV pin supply
✔ Inspect driver output pins (DRV1 & DRV2)
✔ Check short between VCC and GND
✔ Inspect surrounding MOSFETs
✔ Use series bulb for safe power-on testing

⚠ If VCC present but no gate drive → IC may be faulty or protection active.

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Видео NCP1397AG IC Working and Pinout | Full Testing Guide канала Mr India technical head2