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UC3842AD Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part # UC3842AD
Description  SMPS Controller
Download  8 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

UC3842AD Datasheet(HTML) 2 Page - Fairchild Semiconductor

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UC3842A/UC3843A
2
Absolute Maximum Ratings
Electrical Characteristics
(VCC = 15V, RT = 10KΩ, CT = 3.3nF, TA = 0°C to + 70°C ,Unless otherwise specified)
Parameter
Symbol
Value
Unit
Supply Voltage
VCC
30
V
Output Current
IO
± 1
A
Analog Inputs (pin 2, 3)
VI(ANA)
- 0.3 to 6.3
V
Error Amp. Output Sink Current
ISINK(EA)
10
mA
Power Dissipation
PD
1W
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
REFERENCE SECTION
Output Voltage
VREF
TJ = 25
°C, IO = 1mA
4.9
5.0
5.1
V
Line Regulation
∆VREF
VCC = 12V to 25V
-
6
20
mV
Load Regulation
∆VREF
IO = 1mA to 20mA
-
6
25
mV
Output Short Circuit
ISC
Ta = 25
°C
-
- 100 - 180
mA
OSILLATOR SECTION
Initial Accuracy
FOSC
TJ = 25
°C
47
52
57
KHz
Voltage Stability
STV
VCC = 12V to 25V
-
0.2
1
%
Amplitude
VOSC
VPIN4, Peak to Peak
-
1.7
-
V
Discharge Current
IDISCHG
TJ = 25
°C, Pin4 = 2V
7.8
8.3
8.8
mA
CURRENT SENSE SECTION
Gain
GV
(NOTE 2, 3)
2.85
3
3.15
V/V
Maximum Input Signal
VI(MAX)
VPIN1 = 5V(NOTE 2)
0.9
1.0
1.1
V
PSRR
PSRR
VCC = 12V to 25V (NOTE 1, 2)
-
70
-
dB
Input Bias Current
IBIAS
-
-
- 2
-10
uA
Delay to Output
TD
VPIN3 = 0 V to 2V (NOTE1)
-
100
200
ns


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