Maker : On-Bright
Part No. : OB2262

  Datasheet PDF : OB2262.pdf
  Cross Reference : OB2262 Cross Reference
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Product Information

OB2262 Current Mode PWM Controller GENERAL DESCRIPTION OB2262 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications in sub 30W range. PWM switching frequency at normal operation is externally programmable and trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved. www.DataSheet4U.com VDD low startup current and low operating current contribute to a reliable power on startup design with OB2262. A large value resistor could thus be used in the startup circuit to minimize the standby power. The internal slope compensation improves system large signal stability and reduces the possible subharmonic oscillation at high PWM duty cycle output. Leading-edge blanking on current sense(CS) input removes the signal glitch due to snubber circuit diode reverse recovery and thus greatly reduces the external component count and system cost in the design. OB2262 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). The Gate-drive output is clamped to maximum 18V to protect the power MOSFET. Excellent EMI performance is achieved 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. OB2262 is offered in SOT23-6, SOP-8 and DIP-8 packages. FEATURES Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design ■ Audio Noise Free Operation Programmable PWM Switching ■ External Frequency ■ Internal Synchronized Slope Compensation ■ Low VDD Startup Current and Low Operating Current (1.4mA) ■ 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 Gate Output Maximum Voltage Clamp (18V) 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). ■ APPLICATIONS Offline AC/DC flyback converter for ■ Battery Charger ■ Power Adaptor ■ Set-Top Box Power Supplies ■ Open-frame SMPS TYPICAL APPLICATION EMI F i l te r 1 AC IN 4 2 + + + DC OUT 3 V DD GATE RI OB2262 S E NSE GND OB 43 1 FB ©On-Bright Electronics -1- Confidential to Micro Bridge OB_DOC_DS_62B5 OB2262 Current Mode PWM Controller GENERAL INFORMATION Pin Configuration The OB2262 is offered in SOT23-6, DIP8 and SOP8 packages, shown as below. Ordering Information Part Number OB2262MP OB2262AP OB2262CP Description SOT23-6, Pb-free DIP8, Pb-free SOP8, Pb-free Package Dissipation Rating RθJA Package (°C/W) www.DataSheet4U.com DIP8 SOP8 SOT23-6 90 150 200 Absolute Maximum Ratings Parameter Value VDD DC Supply Voltage 30 V VDD Zener Clamp VDD_Clamp+0.1V Note Voltage VDD DC Clamp Current 10 mA VFB Input Voltage -0.3 to 7V VSENSE Input Voltage to -0.3 to 7V Sense Pin VRI Input Voltage to RI Pin -0.3 to 7V Min/Max Operating -20 to 150 oC Junction Temperature TJ Min/Max Storage -55 to 160 oC Temperature Tstg Note: VDD_Clamp has a nominal value of 34V. 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. ©On-Bright Electronics -2- Confidential to Micro Bridge OB_DOC_DS_62B5 OB2262 Current Mode PWM Controller Marking Information www.DataSheet4U.com TERMINAL ASSI...

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