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PDF OB2201 Data sheet ( Hoja de datos )
| Número de pieza | OB2201 | |
| Descripción | High Performance Quasi-Resonant PWM Controller | |
| Fabricantes | On-Bright Electronics | |
| Logotipo |  |
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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
http://www.Datasheet4U.com
1 page  
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
5 Page 
OB2201
High Performance Quasi-Resonant PWM Controller
PACKAGE MECHANICAL DATA
8-Pin Plastic DIP
Symbol
A
A1
A2
B
B1
C
D
E
E1
e
L
E2
Dimensions In Millimeters
Min Max
3.710
5.334
0.381
3.175
3.600
0.350
0.650
1.524 (BSC)
0.200
0.360
9.000
10.160
6.200
6.600
7.320
7.920
2.540 (BSC)
2.921
3.810
8.200
9.525
Dimensions In Inches
Min Max
0.146
0.21
0.015
0.125
0.142
0.014
0.026
0.06 (BSC)
0.008
0.014
0.354
0.4
0.244
0.260
0.288
0.312
0.1 (BSC)
0.115
0.15
0.323
0.375
©On-Bright Electronics
Confidential
- 11 -
Datasheet
OB_DOC_DS_2201A1
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet OB2201.PDF ] | |
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