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OB2268CPC, OB2269AP, OB2269C

Table of contents:
Info of OB2268CPC
Info of OB2269AP
Info of OB2269C

OB2268CPC, OB2269AP, OB2269C Selling Leads, Datasheet

MFG:OB Package Cooled:SOP-8 D/C:2010

OB2268CPC, OB2269AP, OB2269C Datasheet download

Five Points

Part Number: OB2268CPC

MFG: OB

Package Cooled: SOP-8

D/C: 2010

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OB2269C General Description

OB2269C is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications.

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 OB2269C. 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 input removes the signal glitch due to snubber circuit diode reverse recovery. This greatly helps to reduce the external component count and system cost in application.

OB2269C offers complete protection coverage with automatic self-recovery feature including Cycle-by- Cycle current limiting (OCP), over load protection (OLP), over temperature protection (OTP), VDD over voltage protection (OVP) and under voltage lockout (UVLO). The Gate-drive output is clamped at 18V to protect the power MOSFET.

In OB2269C, OCP threshold slope is internally optimized to reach constant output power limit over universal AC input range.

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 operation. Consequently, audio noise performance is greatly improved.

OB2269C is offered in both SOP-8 and DIP-8 packages.

OB2269C Maximum Ratings

Parameter	Value
VDD/VIN DC Supply Voltage	30 V
VDD Zener Clamp Voltage^Note	VDD_Clamp+0.1V
VDD Clamp Continuous Current	10 mA
V_FB Input Voltage	-0.3 to 7V
V_SENSE Input Voltage to Sense Pin	-0.3 to 7V
V_RT Input Voltage to RT Pin	-0.3 to 7V
V_RIInput Voltage to RI Pin	-0.3 to 7V
Min/Max Operating Junction Temperature T_J	-20 to 150
Min/Max Storage Temperature T_stg	-20 to 150
Lead Temperature (Soldering,10secs)	260

OB2269C 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 VIN/VDD Startup Current(6.5uA) and Low Operating Current (2.3mA)
Leading Edge Blanking on Current Sense Input
Complete Protection Coverage With Auto Self- Recovery
o External Programmable Over Temperature Protection (OTP)
o With or Without On-chip VDD OVP for System OVP
o Under Voltage Lockout with Hysteresis (UVLO)
o Gate Output Maximum Voltage Clamp (18V)
o Line Compensated Cycle-by-Cycle Overcurrent Threshold Setting For Constant Output Current Limiting Over Universal Input Voltage Range (OCP)
o Over Load Protection. (OLP)

OB2269C Typical Application

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

OB2269C Connection Diagram

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