OB2353 combines a dedicated current mode PWM controller with integrated high voltage power MOSFET.
It is optimized for high performance low standby power and cost effective offline flyback converter applications in sub 10W range. OB2353 PWM frequency operates in the fixed and trimmed . At no load or light load the frequency is internal adjusted, the IC operates in Extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved.
VDD low startup current and low operating current contribute to a reliable power on startup design with OB2353. 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. OB2353 offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle 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. OB2353 is offered in SOP-8 package.
Optimized for sub 10W Applications
Single Chip 650V Sense FET Power Switch for Package.
Soft Start with 4mS
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
-VDD Over Voltage Clamp and Under Voltage Lockout with Hysteresis (UVLO)
-On-Bright Proprietary Line Input Compensated Cycle-by-Cycle Over-current Threshold Setting For Constant Output Power Limiting Over Universal Input Voltage Range.
-Overload Protection (OLP).
-Over voltage Protection(OVP)
Offline AC/DC fly-back converter for
Battery Charger
PDA power supplies
Digital Cameras
Power Adapter
Set-Top Box Power Supplies
Open-frame SMPS
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OB2353 combines a dedicated current mode PWM controller with integrated high voltage power MOSFET.
It is optimized for high performance low standby power and cost effective offline flyback converter applications in sub 10W range. OB2353 PWM frequency operates in the fixed and trimmed . At no load or light load the frequency is internal adjusted, the IC operates in Extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved.
VDD low startup current and low operating current contribute to a reliable power on startup design with OB2353. 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. OB2353 offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle 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. OB2353 is offered in SOP-8 package.
Optimized for sub 10W Applications
Single Chip 650V Sense FET Power Switch for Package.
Soft Start with 4mS
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
-VDD Over Voltage Clamp and Under Voltage Lockout with Hysteresis (UVLO)
-On-Bright Proprietary Line Input Compensated Cycle-by-Cycle Over-current Threshold Setting For Constant Output Power Limiting Over Universal Input Voltage Range.
-Overload Protection (OLP).
-Over voltage Protection(OVP)
Offline AC/DC fly-back converter for
Battery Charger
PDA power supplies
Digital Cameras
Power Adapter
Set-Top Box Power Supplies
Open-frame SMPS