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UC3842 Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. UC3842
Description  SMPS Controller
Download  12 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

UC3842 Datasheet(HTML) 3 Page - Fairchild Semiconductor

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UC3842/UC3843/UC3844/UC3845
3
Electrical Characteristics
(VCC=15V, RT=10k
Ω, CT=3.3nF, TA= 0°C to +70°C, unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
REFERENCE SECTION
Reference Output Voltage
VREF
TJ = 25
°C, IREF = 1mA
4.90
5.00
5.10
V
Line Regulation
∆VREF
12V
≤ VCC ≤ 25V
-
6
20
mV
Load Regulation
∆VREF
1mA
≤ IREF ≤ 20mA
-
6
25
mV
Short Circuit Output Current
ISC
TA = 25
°C
-
-100
-180
mA
OSCILLATOR SECTION
Oscillation Frequency
f
TJ = 25
°C47
52
57
kHz
Frequency Change with
Voltage
∆f/∆VCC
12V
≤ VCC ≤ 25V
-
0.05
1
%
Oscillator Amplitude
VOSC
-
-1.6
-
VP-P
ERROR AMPLIFIER SECTION
Input Bias Current
IBIAS
-
--0.1
-2
µA
Input Voltage
VI(E>A)
Vpin1 = 2.5V
2.42
2.50
2.58
V
Open Loop Voltage Gain
GVO
2V
≤ VO ≤ 4V (Note3)
65
90
-
dB
Power Supply Rejection Ratio
PSRR
12V
≤ VCC ≤ 25V (Note3)
60
70
-
dB
Output Sink Current
ISINK
Vpin2 = 2.7V, Vpin1 = 1.1V
2
7
-
mA
Output Source Current
ISOURCE
Vpin2 = 2.3V, Vpin1 = 5V
-0.6
-1.0
-
mA
High Output Voltage
VOH
Vpin2 = 2.3V, RL = 15k
Ω to GND
5
6
-
V
Low Output Voltage
VOL
Vpin2 = 2.7V, RL = 15k
Ω to Pin 8
-
0.8
1.1
V
CURRENT SENSE SECTION
Gain
GV
(Note 1 & 2)
2.85
3
3.15
V/V
Maximum Input Signal
VI(MAX)
Vpin1 = 5V(Note 1)
0.9
1
1.1
V
Power Supply Rejection Ratio
PSRR
12V
≤ VCC ≤ 25V (Note 1,3)
-
70
-
dB
Input Bias Current
IBIAS
-
--3
-10
µA
OUTPUT SECTION
Low Output Voltage
VOL
ISINK = 20mA
-
0.08
0.4
V
ISINK = 200mA
-
1.4
2.2
V
High Output Voltage
VOH
ISOURCE = 20mA
13
13.5
-
V
ISOURCE = 200mA
12
13.0
-
V
Rise Time
tR
TJ = 25
°C, CL= 1nF (Note 3)
-
45
150
ns
Fall Time
tF
TJ = 25
°C, CL= 1nF (Note 3)
-
35
150
ns
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
VTH(ST)
UC3842/UC3844
14.5
16.0
17.5
V
UC3843/UC3845
7.8
8.4
9.0
V
Min. Operating Voltage
(After Turn On)
VOPR(MIN)
UC3842/UC3844
8.5
10.0
11.5
V
UC3843/UC3844
7.0
7.6
8.2
V


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