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OB2262 Datasheet

Current Mode PWM Controller

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OB2262
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.DataSheeVt4DUD.comlow 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 sub-
harmonic 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-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 soft
switching control at the totem pole gate drive output.
TYPICAL APPLICATION
Current Mode PWM Controller
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
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
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
AC IN
EMI
F i l te r
4
2
+
+
V DD
GATE
OB2262
RI SENSE
FB GND
+ DC OUT
OB431
©On-Bright Electronics
Confidential to Micro Bridge
- 1 - OB_DOC_DS_62B5
On-Bright
On-Bright



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