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

Image

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.

A current-mode PWM (Pulse Width Modulation) controller is an integrated circuit (IC) or semiconductor device designed to control the duty cycle of a switching power supply based on the feedback of the output current. It is commonly used in switch-mode power supplies (SMPS) to regulate and control the output voltage or current, making it a fundamental component in many electronic devices and power conversion applications.

1. Feedback Control: Current-mode PWM controllers regulate the output voltage or current by continuously monitoring the output current and adjusting the switching duty cycle accordingly. This feedback loop helps maintain precise control and stability in the power supply.

2. Switching Regulation: These controllers use PWM to control the switching operation of power transistors (usually MOSFETs) in the SMPS. By adjusting the width of the switching pulses, they regulate the energy delivered to the load.

 

Block Diagram

 

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

 

Application:

1. SMPS for Monitor

2. power adapters, LED drivers, voltage regulator

3. DC-DC converter

 

DP904C PDF Datasheet

 

 

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Part Number: NCP1397B

Function: High Performance Resonant Mode Controller

Package: SO-16 Pin Type

Manufacturer: ON Semiconductor

Images:

Description

The NCP1397B is a high performance controller that can be utilized in half bridge resonant topologies such as series resonant, parallel resonant and LLC resonant converters. It integrates 600 V gate drivers, simplifying layout and reducing external component count. With its unique architecture, including a 500 kHz Voltage Controlled Oscillator whose control mode permits flexibility when an ORing function is required, the NCP1397 delivers everything needed to build
a reliable and rugged resonant mode power supply.

resonant controller, is an electronic device or integrated circuit (IC) used in power electronics to control the operation of resonant mode power supplies. Resonant mode power supplies are a type of switching power supply known for their efficiency and reduced electromagnetic interference (EMI) compared to traditional pulse-width modulation (PWM) power supplies.

Features

1. High−Frequency Operation from 50 kHz up to 500 kHz

2. 600 V High−Voltage Floating Driver

3. Adjustable Minimum Switching Frequency with ±3% Accuracy

4. Adjustable Deadtime from 100 ns to 2 μs.

5. Startup Sequence Via an Externally Adjustable Soft−Start

6. Brown−Out Protection for a Simpler PFC Association

Applications:

1. Flat Panel Display Power Converters

2. High Power ac−dc Adapters for Notebooks

3. Computing Power Supplies

Other data sheets are available within the file: NCP1397, NCP1397A, NCV1397A, NCV1397B

NCP1397B PDF Datasheet