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OB2203 Datasheet

Quasi-Resonant Flyback PWM Controller

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OB2203
Quasi-Resonant Flyback PWM Controller
GENERAL DESCRIPTION
OB2203 is a highly integrated Quasi-Resonant (QR)
controller optimized for high performance offline
flyback converter applications.
At normal load condition, it operates in QR mode
with minimum drain voltage switching. To meet the
CISPR-22 EMI starting at 150KHz, the maximum
switching frequency is internally limited to 130KHz.
It operates in PFM mode for high power conversion
efficiency at light load condition. When the loading is
very small, the IC operates in ‘Extended Burst Mode’
to minimize the switching loss. As a result, lower
standby power consumption and higher conversion
efficiency is achieved.
A built-in P-channel MOSFET and its control are
integrated to automatically turn on or off PFC stage
according to the load conditions. When used with
OB6563 (On-Bright’s PFC controller), the standby
power consumption of less than 400mW can be
achieved in typical 150W SMPS.
OB2203 offers comprehensive protection coverage
including Cycle-by-Cycle Current Limiting(OCP),
VCC Under Voltage Lockout(UVLO), Over Voltage
Protection(OVP), VCC Clamp, Gate Clamp, Over
Load Protection(OLP), On-chip Thermal Shutdown,
Programmable Soft Start, and External Latch
Triggering, Max On-time Limit, etc.
OB2203 is offered in SOP-8 and DIP-8 packages.
FEATURES
Multi-Mode Operation
Quasi-Resonant Operation at Normal Loading
Pulse Frequency Modulation (PFM) Operation at
Light Load
Burst Mode at No Load
Direct Control of the Power Supply of PFC
Controller for Improved Standby Power at
No/Light Load
40KHz Minimum Frequency Limit at QR Mode
130KHz Maximum Frequency Limit
Internal Minimum T_off for Ringing Suppression
45us Maximum On Time Limit
Adaptive Slope Compensation
Internal Leading Edge Blanking
Programmable Soft-start
External Latch Triggering
Internal Temperature Shutdown
1A Peak Current Sink/Source Capability
Programmable Over Voltage Protection (OVP)
APPLICATIONS
Offline AC/DC flyback converter for
Power Adaptor and Open-frame SMPS
LCD Monitor/TV/PC/Set-Top Box Power
Supplies
NB/DVD/Portable DVD Power Supplies
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_0300
On-Bright Electronics
On-Bright Electronics



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