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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

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OB2203
Quasi-Resonant Flyback PWM Controller
GENERAL INFORMATION
Pin Configuration
The pin map of OB2203 in DIP8 and SOP8 package
is shown as below.
Ordering Information
Part Number
OB2203AP
OB2203CP
OB2203CPA
Description
8 Pin DIP, Pb free in Tube
8 Pin SOP, Pb free in Tube
8 Pin SOP, Pb free in T&R
Note: All Devices are offered in Pb-free Package if not otherwise
noted.
Package Dissipation Rating
Package
DIP8
SOP8
RθJA (°C/W)
90
150
Absolute Maximum Ratings
Parameter
VCC Zener Clamp Voltage
VCC Clamp Continuous
Current
SS Input Voltage
FB Input Voltage
CS Input Voltage
DEM Input Voltage
Min/Max Operating Junction
Temperature TJ
Min/Max Storage Temperature
Tstg
Lead Temperature (Soldering,
10secs)
Value
31 V
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-20 to 150 oC
-55 to 150 oC
260 oC
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These are
stress ratings only, functional operation of the device at these or
any other conditions beyond those indicated under “recommended
operating conditions” is not implied. Exposure to absolute
maximum-rated conditions for extended periods may affect device
reliability.
©On-Bright Electronics
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Confidential
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Marking Information
SOP8
OB2203
Quasi-Resonant Flyback PWM Controller
DIP8
LT YWW
OB2203CP
s
Y: Year Code (0-9)
WW: Week Code (1-52)
C: SOP8
P:lead-free
s: internal code
LT YWW
OB2203AP
s
Y: Year Code (0-9)
WW: Week Code (1-52)
A: DIP8
P:lead-free
s: internal code
TERMINAL ASSIGNMENTS
Pin Num Pin Name
1 SS
2 FB
3 CS
4 GND
5 GATE
6 VCC
7 PFCVCC
8 DEM
I/O Description
I/O Soft-start programming pin. Program the soft-start rate with a capacitor to
ground. After soft-start, the pin’s voltage is clamped at 2V. External latch
input, latch will be triggered when SS pin voltage higher than 3.8V.
I/O Feedback input pin. PWM duty cycle is determined by voltage level into this
pin and current-sense signal level at Pin 3. The voltage level at this pin also
controls the mode of operation in one of the three modes: quasi-resonant
(QR), pulse frequency modulation mode (PFM) and burst mode (BM).
I Current sense input.
O Ground for internal circuitry.
O Totem-pole gate drive output for power MOSFET.
P Chip DC power supply pin.
P This pin is a direct connection to the VCC pin via a low impedance switch.
In standby and during the startup sequence, the switch is open and the
PFCVCC is shut down. As soon as the auxiliary winding is stabilized,
PFCVCC connects to the VCC pin and provides power supply to PFC
controller. It goes down in any fault or at No/Light conditions.
I/O Input from auxiliary winding for demagnetization timing. Also this pin is
used for load over voltage protection (OVP).
©On-Bright Electronics
-3-
Confidential
OB_DOC_DS_0300