Maker : On-Bright Electronics
Part No. : OB2358

  Datasheet PDF : OB2358.pdf
  Cross Reference : OB2358 Cross Reference
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Shortcut : OB2353  OB2358 

Product Information

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 at below 20KHZ is minimized in the The tone energy 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 frame design with sufficient drain pattern as a heat sink, at 50℃ ambient. ©On-Bright Electronics -1- On-Bright Confidential to Microbridge OB_DOC_DS_5800 OB2358 Current Mode PWM Power Switch GENERAL INFORMATION Pin Configuration The OB2358 is offered in DIP8 package as shown below. Freq Shuffling Package Dissipation Rating RθJA (℃/W) Package DIP8 75 Note: Drain Pin Connected to 100mm2 PCB copper clad. Absolute Maximum Ratings Parameter Value Drain Voltage (off state) -0.3V to BVdss VDD Voltage -0.3V to 30 V VDD-G Input Voltage -0.3V to 30 V VDD Clamp Continuous 10mA Current FB Input Voltage -0.3 to 7V Sense Input Voltage -0.3 to 7V Min/Max Operating Junction -20 to 150℃ Temperature TJ Min/Max Storage Temperature -55 to 150℃ Tstg Lead Temperature (Soldering, 260℃ 10secs) Note: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. www.DataSheet4U.com Ordering Information Part Number Description OB2358AP DIP8, Pb-free Marking Information ©On-Bright Electronics -2- Confidential OB_DOC_DS_5800 OB2358 Current Mode PWM Power Switch TERMINAL ASSIGNMENTS Pin Name GND FB VDD-G SENSE VDD Drain I/O P I P I P O Description Ground Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and the current-sense signal at Pin 4. Internal Gate Driver Power Supply Current sense input IC DC power supply Input HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer Freq Shuffling www.DataSheet4U.com BLOCK DIAGRAM ©On-Bright Electronics -3- Confidential OB_DOC_DS_5800 OB2358 Current Mode PWM Power Switch Freq Shuffling ELECTRICAL CHARACTERISTI...

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