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PDF OB2273 Datasheet ( Hoja de datos )

Número de pieza OB2273
Descripción High Performance Current Mode PWM Controller
Fabricantes On-Bright 
Logotipo On-Bright Logotipo

Total 12 Páginas
		
OB2273 Hoja de datos, Descripción, Manual
OB2273
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
OB2273 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications.
PWM switching frequency at normal operation is
internally fixed and is 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.
VDD low startup current and low operating current
contribute to a reliable power on startup and low
standby design with OB2273.
OB2273 offers complete protection coverage with
auto-recovery including Cycle-by-Cycle current
limiting (OCP), over load protection (OLP), and
VDD under voltage lockout (UVLO). It also
provides the protections with latched shut down
including over temperature protection (OTP), and
over voltage (fixed or adjustable) protection (OVP).
Excellent EMI performance is achieved with On-
Bright proprietary frequency shuffling technique.
The tone energy at below 20KHZ is minimized in
the design and audio noise is eliminated during
operation.
OB2273 is offered in SOT23-6 and DIP-8 package.
FEATURES
Power on Soft Start Reducing MOSFET Vds
Stress
Frequency shuffling for EMI
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Design
Audio Noise Free Operation
Fixed 65KHZ Switching Frequency
Comprehensive Protection Coverage
o VDD Under Voltage Lockout with
Hysteresis (UVLO)
o Cycle-by-cycle over current threshold
setting for constant output power limiting
over universal input voltage range
o Overload Protection (OLP) with auto-
recovery
o Over Temperature Protection (OTP) with
latch shut down
o VDD Over voltage Protection(OVP) with
latch shut down
o Adjustable OVP through external Zener
APPLICATIONS
Offline AC/DC flyback converter for
Battery Charger
Power Adapter
Set-Top Box Power Supplies
Open-frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_227305
Free Datasheet http://www.datasheet4u.com/

1 page

OB2273 pdf
OB2273
High Performance Current Mode PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=18V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VDD)
Istartup
VDD Start up Current
VDD=UVLO(OFF)-
1V, measure leakage
current into VDD
5 20 uA
I_VDD_Operation Operation Current
VDD=18V,VFB=3V,
CS=0V,Cgate=1nF
1.8 2.5 mA
UVLO(ON)
VDD Under Voltage Lockout
Enter
89
10 V
UVLO(OFF)
VDD Under Voltage Lockout
Exit (Recovery)
14.3 15.3 16.3 V
Vpull-up
Pull-up PMOS active
13 V
Vdd_clamp
Ivdd=10mA
30 32 34 V
OVP(ON)
Over voltage
voltage
protection
CS=0V,FB=3V
Ramp up VDD until
26
gate clock is off
28
30 V
Vlatch_release Latch release voltage
5V
Feedback Input Section(FB Pin)
VFB_Open
VFB Open Loop Voltage
Avcs
PWM input gain Δ VFB/ Δ
VCS
3.9 4.2
2
V
V/V
Maximum duty Max duty cycle @
cycle
VDD=18V,VFB=3V,VCS=0V
75 80 85 %
Vref_green
The threshold enter green
mode
2V
Vref_burst_H
The threshold exit burst mode
1.275
V
Vref_burst_L
The threshold enter burst
mode
1.175
V
IFB_Short
FB pin short circuit current
Short FB pin to GND
and measure current
0.4
mA
VTH_PL
Power Limiting FB Threshold
Voltage
3.7 V
TD_PL
Power limiting Debounce
Time
80 88 96 mSec
ZFB_IN
Input Impedance
16 Kohm
Current Sense Input(CS Pin)
SST Soft start time
4 ms
T_blanking
Leading edge blanking time
220 ns
ZSENSE_IN
Input Impedance
From Over Current
40
Kohm
TD_OC
Over Current Detection and Occurs till the
Control Delay
Gatedrive output start
to turn off
120
nSec
VTH_OC
Internal Current Limiting
Threshold Voltage with zero
duty cycle
0.75 V
Vocp_clamping CS voltage clamper
0.9 V
Oscillator
FOSC
Normal Oscillation Frequency
VDD=18V,
CS=0V
FB=3V, 60
65
70 KHZ
f_OSC
Frequency jittering
+/-4 %
F_shuffling
Shuffling frequency
32 Hz
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_227305
Free Datasheet http://www.datasheet4u.com/

5 Page

OB2273 arduino
OB2273
High Performance Current Mode PWM Controller
Symbol
A
A1
A2
B
B1
C
D
E
E1
e
L
E2
Dimensions In Millimeters
Min Max
3.710
5.334
0.381
2.921
4.953
0.350
0.650
1.524 (BSC)
0.200
0.360
9.000
10.160
6.096
7.112
7.320
8.255
2.540 (BSC)
2.921
3.810
7.620
10.920
Dimensions In Inches
Min
0.146
Max
0.210
0.015
0.115
0.195
0.014
0.026
0.06 (BSC)
0.008
0.014
0.354
0.400
0.240
0.280
0.288
0.325
0.115
0.1 (BSC)
0.150
0.300
0.430
©On-Bright Electronics
Confidential
- 11 -
Preliminary Datasheet
OB_DOC_DS_227305
Free Datasheet http://www.datasheet4u.com/

11 Page


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