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PDF OB2278 Datasheet ( Hoja de datos )

Número de pieza OB2278
Descripción Current Mode PWM Controller
Fabricantes On-Bright 
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OB2278 datasheet

1 Page

OB2278 pdf
OB2278
Current Mode PWM ControllerLatch Shutdown
ELECTRICAL CHARACTERISTICS
(TA = 25, RI=100K ohm, VDD=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VDD)
I_VDD_Startup VDD Start up Current
VDD =15V Measure
current into VDD
3 20 uA
I_VDD_Ops
UVLO(Enter)
UVLO(Exit)
Operation Current
VDD Under Voltage
Lockout Enter
VDD Under Voltage
Lockout Exit (Startup)
VFB=3V
2.3 mA
8.8 9.8 10.8 V
15.5 16.5 17.5 V
OVP(Latch)
OVP(De-Latch)
VDD Over Voltage Latch
Trigger
VDD Latch Release
Voltage Threshold
26.5 28
7.5
29.5 V
V
I(Vdd)_latch
VDD bleeding current at
latch shutdown when VDD
= 9V
45 uA
TD_OVP
VDD_Clamp
T_Softstart
VDD OVP Debounce time
VDD Zener Clamp Voltage
Soft Start Time
I(VDD ) = 5 mA
80 uSec
35 V
3 mSec
Feedback Input Section(FB Pin)
AVCS
PWM Input Gain
VFB_Open
VFB Open Voltage
ΔVFB /ΔVcs
2.8 V/V
6.2 V
IFB_Short
FB pin short circuit current
Short FB pin to GND,
measure current
0.75
mA
VTH_0D
Zero Duty Cycle FB
Threshold Voltage
0.95 V
VTH_BM
Burst Mode FB Threshold
Voltage
1.6 V
VTH_PL
Power Limiting
Threshold Voltage
FB
4.4 V
TD_PL
Power limiting Debounce
Time
80 mSec
ZFB_IN
Input Impedance
9.0 Kohm
Current Sense Input(Sense Pin)
T_blanking
Sense Input Leading Edge
Blanking Time
300 nSec
ZSENSE_IN
TD_OC
Sense Input Impedance
Over Current Detection
and Control Delay
CL=1nf at GATE,
30 Kohm
70 nSec
Current Limiting Threshold
VTH_OC_0
at No Compensation
I(VIN) = 0uA
0.85 0.90 0.95 V
VTH_OC_1
Oscillator
FOSC
f_Temp
f_VDD
Current Limiting Threshold
at Compensation
I(VIN) = 150uA
Normal
Frequency
Frequency
Stability
Frequency
Stability
Oscillation
Temperature
Voltage
-20to 100
VDD = 12-28V,
0.80 V
60 65 70 KHZ
3%
3%
©On-Bright Electronics
Confidential
-5-
Datasheet
OB_DOC_DS_2278A2

5 Page

OB2278 arduino
PACKAGE MECHANICAL DATA
8-Pin Plastic DIP
OB2278
Current Mode PWM ControllerLatch Shutdown
Symbol
A
A1
A2
B
B1
C
D
E
E1
e
L
E2
Dimensions In Millimeters
Min
3.710
Max
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
0.1 (BSC)
0.115
0.150
0.300
0.430
©On-Bright Electronics
Confidential
- 11 -
Datasheet
OB_DOC_DS_2278A2

11 Page





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