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OB2201
High Performance Quasi-Resonant PWM Controller
Product Specification
GENERAL DESCRIPTION
OB2201 is a high performance flyback Quasi-
Resonant (QR) controller optimized to achieve
high efficiency in the universal input range and full
loading range with effective system cost.
At full loading, the IC operates in fix frequency
(52KHz) CCM mode in the low line input range
and operates in QR mode in high line input range.
In this way, high efficiency in the universal input
range at full loading can be achieved.
At normal load condition, it operates in QR mode.
To minimize switching loss, the maximum
switching frequency in QR mode is internally
limited to 90 KHz. When the loading goes low, it
operates in PFM mode for high power conversion
efficiency. When the load is very small, the IC
operates in ‘Extended Burst Mode’ to minimize the
standby power loss. As a result, high conversion
efficiency can be achieved in the whole loading
range.
OB2201 offers comprehensive protection
coverage including Cycle-by-Cycle Current
Limiting (OCP), VCC Under Voltage Lockout
(UVLO), Output Over Voltage Protection (OVP),
Over Temperature Protection (OTP), Over Load
Protection (OLP), VCC Over Voltage Protection
(VCC OVP), VCC Clamp, and Gate Clamp.
OB2201 also features protections against pin
open and short conditions on selected pins.
OB2201 is offered in SOP-8 and DIP-8 packages.
TYPICAL APPLICATION
FEATURES
Multi-Mode Operation:
At Full Loading, Fix Frequency (52KHz)
CCM Operation @ Low Line and QR Mode
Operation @ High Line Input
Quasi-Resonant Operation at Normal
Load
Pulse Frequency Modulation (PFM)
Operation at Light Load
Burst Mode at No Load
Adaptive Frequency Shuffling and Slope
Compensation @ Fix Frequency CCM Mode
Programmable OTP with latch Shutdown
Fixed 4ms Soft-start
2.5us Minimum Off Time
12.5us Maximum On Time Limit
55us Maximum Off Time Limit
90KHz Maximum Frequency Limit
Internal Leading Edge Blanking
Output Over Voltage Protection
800mA Peak Current Sink/Source Capability
APPLICATIONS
Offline AC/DC flyback converter for
Power Adaptor and Open-frame SMPS
Set-Top Box Power Supplies
NB/DVD
AC
OB2201
NTC
1 RI
RT 8
2 FB
DEM 7
3 CS
4 GND
VCC 6
GATE 5
©On-Bright Electronics
Confidential
-1-
Datasheet
OB_DOC_DS_2201A1
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OB2201
High Performance Quasi-Resonant PWM Controller
GENERAL INFORMATION
Pin Configuration
The pin map of OB2201 in DIP8 and SOP8
package is shown as below.
Ordering Information
Part Number
OB2201AP
OB2201CP
OB2201CPA
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 (/W)
90
150
Absolute Maximum Ratings
Parameter
VCC Zener Clamp Voltage
Value
29 V
VCC Clamp
Current
RI Input Voltage
Continuous 10 mA
-0.3 to 7V
FB Input Voltage
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
DEM Input Voltage
-0.7 to 7V
RT Input Voltage
-0.3 to 7V
Maximum Operating Junction
Temperature TJ
Min/Max Storage Temperature
Tstg
Lead Temperature (Soldering,
10secs)
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.
OB2201 X X X
High Performance Qusi-Resonant
PWM controller
Package
A:DIP8
C:SOP8
Package Pb free
Blank:Normal
P:lead-free
Packing
Blank:Tube
A: Tape/Reel
©On-Bright Electronics
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Datasheet
OB_DOC_DS_2201A1

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Marking Information
SOP8
OB2201
High Performance Quasi-Resonant PWM Controller
DIP8
YWW
OB2201CP
s
Y: Year Code (0-9)
WW: Week Code (1-52)
C: SOP8
P:lead-free
s: internal code
YWW
OB2201AP
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 RI
2 FB
3 CS
4 GND
5 GATE
6 VCC
7 DEM
8 RT
I/O Description
A resistor connected between RI and GND sets the internal frequency
I and timer. The resistor is recommended to be set in the vicinity of 20K
Ohm.
I
Feedback input pin. PWM duty cycle is determined by voltage level into
this pin and current-sense signal level at Pin 3.
I Current sense input.
P Ground for internal circuitry.
O Totem-pole gate drive output for power MOSFET.
P Chip DC power supply pin.
I
Transformer core demagnetization detection pin. This pin is also used for
output over voltage protection (OVP).
I
Over Temperature Protection pin. Connected through a NTC resistor to
GND for over temperature latch shutdown.
©On-Bright Electronics
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-3-
Datasheet
OB_DOC_DS_2201A1

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BLOCK DIAGRAM
VDD
6
UVLO
POR
Regulator
Internal
supply
RT
8 OTP
DEM
7
Valley
detector
Load OVP
Adaptive Frequency
Shuffling
OB2201
High Performance Quasi-Resonant PWM Controller
1 RI
Trimmed
Voltage /Current
Reference
Internal reference
Timer,
Logic,
&
Fault
Management
SQ
R Qb
OLP
Soft
Driver
GATE
5
Mode selection
FB
2
4 GND
4mS soft
startup
LEB
CS
3
RECOMMENDED OPERATING CONDITION
Symbol
Parameter
Min Max Unit
VCC
VCC Supply Voltage
12 28 V
TA
Operating Ambient Temperature
-20
85
oC
©On-Bright Electronics
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-4-
Datasheet
OB_DOC_DS_2201A1

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OB2201
High Performance Quasi-Resonant PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25OC, VCC=16V, RI=20K Ohm if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage Section (VCC Pin)
I_VCC_Startup VCC Start up Current
VCC =UVLO(OFF)-1.5V,
Measure current into VCC
-
5 15 uA
I_VCC_quiet
I_VCC_operation
Operation Current without
switching
Operation current with
switching
FB=3V
FB=3V,
GATE
-
1nF load at -
2.0 4.0 mA
3.0 5.0 mA
UVLO(ON)
UVLO(OFF)
VCC Under Voltage
Lockout Enter
VCC Under Voltage
Lockout Exit (Startup)
8.0 9.0 10.0 V
15 16 17 V
OVP(ON)
VCC Over Voltage
Protection Enter
28 V
VCC_Clamp
VCC Zener
Voltage
Clamp I_VCC = 5 mA
29 V
Feedback Input Section (FB Pin)
AVCS
PWM Input Gain
ΔVFB /ΔVcs
- 3.5 - V/V
VFB_Open
FB Open Voltage
-- 5.3 -- V
IFB_Short
VTH_BM_on
VTH_BM_off
VTH_PL
FB pin short circuit
current
Burst Mode on threshold
Burst Mode off threshold
Power Limiting FB
Threshold Voltage
Short FB pin to GND,
measure current
--
-
-
-
1.5 -
0.8 -
0.7 -
4.4 -
mA
V
V
V
TD_PL
Power limiting Debounce
Time
ZFB_IN
Input Impedance
Current Sense Input Section (CS Pin)
T_blanking
CS Input Leading Edge
Blanking Time
-- 80 -- ms
- 4 - Kohm
- 300 - ns
VTH_OCP_zero_
ontime
VTH_OCP_max
Internal current
threshold
Internal current
threshold
limiting
limiting
Zero duty cycle
Maximum duty cycle
0.41
5
0.45
0.48
5
V
- 0.80 - V
VTH_CS_min
Flodback mode and burst
mode CS peak
0.3 V
TD_OC
Over Current Detection
and Control Delay
CL=1nf at GATE,
- 100 -- ns
Demagnetization Detection Section (DEM Pin)
Demagnetization
VTH_DEM
comparator threshold
voltage
-- 75 -- mV
VDEM_clamp(neg)
VDEM_clamp(pos)
Tsupp
TOUT
TDEM_delay
Negative clamp voltage
Positive clamp voltage
Suppression of the
transformer ringing at
start of secondary stroke
Timeout after last demag
transistion
Demag propagation delay
- -0.7 - V
- 6.0 - V
-- 2.5 -- us
-- 5 -- us
- 250 - ns
©On-Bright Electronics
Confidential
-5-
Datasheet
OB_DOC_DS_2201A1