OB2203 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.
OB2203 Key Features
- Multi-Mode Operation
- Quasi-Resonant Operation at Normal Loading
- Pulse Frequency Modulation (PFM) Operation at
- Burst Mode at No Load
- Direct Control of the Power Supply of PFC
- 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 pensation