Current Mode PWM Power Switch - On-Bright Electronics
Description
OB2358 Current Mode PWM Power Switch
GENERAL DESCRIPTION
OB2358 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.
OB2358 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.
www.
DataSheet4U.
com The tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation.
OB2358 is offered in DIP8 package.
■ ■
Freq Shuffling
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 SelfRecovery 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 Overload Protection (OLP).
o Over voltage Protection(OVP)
APPLICATIONS
Offline AC/DC flyback converter for ■ AC/DC adaptor ■ PDA power supplies ■ Digital Cameras and Camcorder Adaptor ■ VCR, SVR, STB, DVD&DVCD Player SMPS ■ Set-Top Box Power ■ Auxiliary Power Supply for PC and Server ■ Open-frame SMPS
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
TYPICAL APPLICATION
Output Power Table
Product OB2358 Notes:
1.
406442781
230VAC±15% Open Frame1 27W
85-265VAC Open Frame1 16W
Maximum practical continuous power in an open fram...
Similar Datasheet
