OB2269 On-Bright Electronics, Inc., OB2269 Datasheet
OB2269
Manufacturer Part Number
OB2269
Description
Current Mode Pwm Controller
Manufacturer
On-Bright Electronics, Inc.
Datasheet
1.OB2269.pdf
(1 pages)
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GENERAL DESCRIPTION
OB2269 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
OB2269. 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 sub-
harmonic 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. and greatly reduces the external
component count and system cost in the design.
OB2269 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.
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.
TYPICAL APPLICATION
©On-Bright Electronics
Current Mode PWM Controller
- 1 -
OB2269 is offered in SOP-8 and DIP-8 packages.
FEATURES
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■
■
■
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■
APPLICATIONS
Offline AC/DC flyback converter for
■
■
■
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o External Programmable Over Temperature
o With or Without On-chip VDD OVP for
o Under
o Gate Output Maximum Voltage Clamp (18V)
o Line
o Over Load Protection. (OLP)
On-Bright
Technology for Improved EMI Performance
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design
Audio Noise Free Operation
External
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
Laptop Power Adaptor
PC/TV/Set-Top Box Power Supplies
Open-frame SMPS
Battery Charger
Protection (OTP)
System OVP
(UVLO)
current Threshold Setting For Constant Output
Current Limiting Over Universal Input Voltage
Range (OCP)
Compensated
Voltage
Programmable
Proprietary
Lockout
Cycle-by-Cycle
Frequency
PWM
Frequency Shuffling
with
OB_DOC_DS_69C0
Confidential
OB2269
Hysteresis
Switching
Shuffling
Over-
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