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OB2203 - Quasi-Resonant Flyback PWM Controller

Download the OB2203 datasheet PDF. This datasheet also covers the OB2203_On variant, as both devices belong to the same quasi-resonant flyback pwm controller family and are provided as variant models within a single manufacturer datasheet.

General Description

OB2203 is a highly integrated Quasi-Resonant (QR) controller optimized for high performance offline flyback converter applications.

At normal load condition, it operates in QR mode with minimum drain voltage switching.

Key Features

  • Multi-Mode Operation.
  • Quasi-Resonant Operation at Normal Loading.
  • Pulse Frequency Modulation (PFM) Operation at Light Load.
  • Burst Mode at No Load.
  • Direct Control of the Power Supply of PFC Controller for Improved Standby Power at No/Light Load.
  • 40KHz Minimum Frequency Limit at QR Mode.
  • 130KHz Maximum Frequency Limit.
  • Internal Minimum T_off for Ringing Suppression.
  • 45us Maximum On Time Limit.
  • Adaptive Slope Compensation.
  • Internal Leading Edg.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (OB2203_On-BrightElectronics.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number OB2203
Manufacturer On-Bright
File Size 424.46 KB
Description Quasi-Resonant Flyback PWM Controller
Datasheet download datasheet OB2203 Datasheet

Other Datasheets by On-Bright

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OB2269C Current Mode PWM Controller

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
OB2203 Quasi-Resonant Flyback PWM Controller GENERAL DESCRIPTION OB2203 is a highly integrated Quasi-Resonant (QR) controller optimized for high performance offline flyback converter applications. At normal load condition, it operates in QR mode with minimum drain voltage switching. To meet the CISPR-22 EMI starting at 150KHz, the maximum switching frequency is internally limited to 130KHz. It operates in PFM mode for high power conversion efficiency at light load condition. When the loading is very small, the IC operates in ‘Extended Burst Mode’ to minimize the switching loss. As a result, lower standby power consumption and higher conversion efficiency is achieved.