This post explains for the PWM Controller. 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.

The Part Number is OB2279.

The function of this semiconductor is Current Mode PWM Controller.

The package is DIP, SOP 8 Pin Type

Manufacturer: On-Bright

Preview images :

Description

The OB2279 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications.

PWM switching frequency at normal operation is externally programmable and trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved.

Pinouts

Features

1. On-Bright Proprietary Frequency Shuffling Technology for Improved EMI Performance

2. Power On Soft Start

3. Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design

4. Audio Noise Free Operation

5. External Programmable PWM Switching Frequency

6. Internal Synchronized Slope Compensation

7. Low VIN/VDD Startup Current(3uA) and Low Operating Current (2.3mA)

 

Applications:

1. Adaptor

2. Notebook Adaptor

3. LCD Monitor/TV/PC/Set-Top Box Power Supplies

4. Open-frame SMPS

5. Printer Power

Other data sheets are available within the file: OB2279AP, OB2279CP, OB2279CPA,

0B2279AP, 0B2279CP, 0B2279CPA, 0B2279

 

OB2279 PDF Datasheet

Part Number: SN03ACPA

Function: High Power Factor Flyback PWM Controller

Package: SOP, DIP 8 Pin Type

Manufacturer: On-Bright Electronics

Images:

1 page

Description

The SN03ACPA is a high power factor flyback PWM controller special for lighting applications.
SN03A features an internal start-up timer for stand-alone applications, an analog multiplier with for power factor correction (PFC), zero current detector (ZCD) to ensure TM operation, a current sensing comparator with built-in leading-edge blanking, and a totem pole output ideally suited for driving a power MOSFET.

Features

1. Low Start-up Current and Operating Current

2. Cycle-by-Cycle Current Limiting

3. Internal Leading Edge Blanking

4. Analog multiplier for Power Factor Correction

5. Internal Startup Timer for Stand-alone Applications

6. Trimmed 1.5% Internal Band gap Reference

7. Under Voltage Lockout with Hysteresis

2 page

A Flyback PWM (Pulse Width Modulation) Controller is an essential component in a flyback converter, which is a type of switched-mode power supply (SMPS) topology commonly used for power conversion and voltage regulation. The flyback converter is known for its ability to provide galvanic isolation between the input and output, making it suitable for a wide range of applications, including power adapters, battery chargers, and LED drivers.

 

Applications:

1. Single Stage High PF Flyback AC/DC SMPS

2. LED Lighting Power

 

Other data sheets are available within the file: SN03AAP, SN03ACP

 

SN03ACPA PDF Datasheet