Current Mode PWM Power Switch Frequency Shuffling
OB2358L 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 27W range.
OB2358L offers complete protection coverage
with automatic self-recovery feature including
Cycle-by-Cycle current limiting (OCP), over load
protection (OLP), over temperature protection
(OTP), over voltage protection and VDD under
voltage lockout (UVLO).
performance is achieved with On-Bright
proprietary frequency shuffling technique together
with soft switching control at the totem pole gate
The tone energy at below 20KHZ is minimized in
the design and audio noise is eliminated during
OB2358L is offered in DIP8 package.
Offline AC/DC flyback converter for
■ AC/DC adapter
■ PDA power supplies
■ Digital Cameras and Camcorder Adapter
■ VCR, SVR, STB, DVD&DVCD Player SMPS
■ Set-Top Box Power
■ Auxiliary Power Supply for PC and Server
■ Open-frame SMPS
■ Power on Soft Start Reducing MOSFET Vds
■ Frequency shuffling for EMI
■ Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
■ Audio Noise Free Operation
■ Fixed 50KHZ Switching Frequency
■ Internal Synchronized Slope Compensation
■ Low VDD Startup Current and Low Operating
■ Leading Edge Blanking on Current Sense
■ Good Protection Coverage With Auto Self-
o VDD Under Voltage Lockout with Hysteresis
o Over Temperature Protection (OTP)
o On-Bright Proprietary Line Input
Cycle-by-Cycle Over-current Threshold
Setting For Constant Output Power Limiting
Over Universal Input Voltage Range.
o Overload Protection (OLP).
o Over voltage Protection(OVP)
Output Power Table
Notes: 1. Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50℃
ambient. Higher output power is possible with extra added heat sink or air circulation to reduce thermal resistance.