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PDF OB2273 Datasheet ( Hoja de datos )

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

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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/

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