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OB2263, OB2263AP, OB2268

Table of contents:
Info of OB2263
Info of OB2263AP
Info of OB2268

OB2263, OB2263AP, OB2268 Selling Leads, Datasheet

MFG:OB Package Cooled:SOT23-6 D/C:10

OB2263, OB2263AP, OB2268 Datasheet download

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Part Number: OB2263

MFG: OB

Package Cooled: SOT23-6

D/C: 10

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OB2263 General Description

OB2263 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.VDD low startup current and low operating current contribute to a reliable power on startup design with

OB2263. 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.

OB2263 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). The Gate-drive output is clamped to maximum 18V to protect the power MOSFET. Excellent EMI performance is achieved with On- Bright proprietary frequency shuffling technique together with soft switching control at the totem pole gate drive output.

Tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation.

OB2263 is offered in SOT23-6, SOP-8 and DIP-8 packages.

OB2263 Maximum Ratings

Parameter	Value
VDD DC Supply Voltage	30 V
VDD Clamp Voltage	34V
VDD DC Clamp Current	10 mA
VFB Input Voltage	-0.3 to 7V
VSENSE Input Voltage to Sense Pin	-0.3 to 7V
VRI Input Voltage to RI Pin	-0.3 to 7V
Min/Max Operating Junction Temperature TJ	-20 to 150 oC
Min/Max Storage Temperature Tstg	-55 to 160 oC

OB2263 Features

· On-Bright Proprietary Frequency Shuffling
Technology for Improved EMI Performance.
· Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design
· Audio Noise Free Operation
· External Programmable PWM Switching 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 Self- Recovery
· VDD Over Voltage Clamp and Under Voltage
Lockout with Hysteresis (UVLO)
· Gate Output Maximum Voltage Clamp (18V)
· 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)

OB2263 Typical Application

Offline AC/DC flyback converter for
Battery Charger
Power Adaptor
Set-Top Box Power Supplies
Open-frame SMPS

OB2263 Connection Diagram

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