OB2354 Current Mode PWM Power Switch Freq Shuffling
GENERAL DESCRIPTION
OB2354 combines a dedicated current mode PWM co...
OB2354 Current Mode PWM Power Switch Freq Shuffling
GENERAL DESCRIPTION
OB2354 combines a dedicated current mode PWM controller with a high
voltage power
MOSFET. It is optimized for high performance, low standby power, and cost effective off-line flyback converter applications in sub 20W range. OB2354 offers complete protection coverage with automatic self-recovery feature including Cycle-byCycle current limiting (OCP), over load protection (OLP), VDD over
voltage clamp and under
voltage lockout (UVLO). Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique together with soft switching control at the totem pole gate drive output. The tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation. OB2354 is offered in DIP8 package.
FEATURES
■ Power on Soft Start Reducing
MOSFET Vds Stress
■ Frequency shuffling for EMI ■ Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design ■ Audio Noise Free Operation
■ Fixed 50KHZ Switching Frequency ■ Internal Synchronized Slope Compensation ■ Low VDD Startup Current and Low Operating
Current ■ Leading Edge Blanking on Current Sense Input ■ Good Protection Coverage With Auto Self-
Recovery o VDD Over
Voltage Clamp and Under
Voltage
Lockout with Hysteresis (UVLO) o On-Bright Proprietary Line Input Compensated
Cycle-by-Cycle Over-current Threshold Setting For Constant Output Power Limiting Over Universal Input
Voltage Range. o Overloa...