This post explains for the PWM Controller.
The Part Number is DP904C.
The package is TO220-5P type.
The function of this semiconductor is pulse-width modulated Controller.
Manufacturer: ETC
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Description
This DP904C is a current mode pulse-width modulated (PWM) controller combined with a high-voltage power SenseFET in a single package. The PWM controller features integrated oscillator to be synchronized with the external sync signal, under-voltage lockout, optimized gate driver,
temperature compensated precise current sources for the loop compensation.
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Features
1. Quasi Resonant Converter Controller
2. Internal Burst mode Controller for Stand-by mode
3. Pulse by pulse current limiting
4. Over current Latch protection
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Application:
1. SMPS for Monitor
DP904C PDF Datasheet
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