UC3842 Просмотр технического описания (PDF) - Fairchild Semiconductor
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UC3842 Datasheet PDF : 12 Pages
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UC3842/UC3843/UC3844/UC3845
Electrical Characteristics
(VCC=15V, RT=10kΩ, CT=3.3nF, TA= 0°C to +70°C, unless otherwise specified)
Parameter
Symbol
Conditions
REFERENCE SECTION
Reference Output Voltage
VREF TJ = 25°C, IREF = 1mA
Line Regulation
∆VREF 12V ≤ VCC ≤ 25V
Load Regulation
∆VREF 1mA ≤ IREF ≤ 20mA
Short Circuit Output Current
ISC
TA = 25°C
OSCILLATOR SECTION
Oscillation Frequency
f
TJ = 25°C
Frequency Change with
Voltage
∆f/∆VCC 12V ≤ VCC ≤ 25V
Oscillator Amplitude
VOSC
-
ERROR AMPLIFIER SECTION
Input Bias Current
IBIAS
-
Input Voltage
VI(E>A) Vpin1 = 2.5V
Open Loop Voltage Gain
GVO
2V ≤ VO ≤ 4V (Note3)
Power Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V (Note3)
Output Sink Current
ISINK Vpin2 = 2.7V, Vpin1 = 1.1V
Output Source Current
ISOURCE Vpin2 = 2.3V, Vpin1 = 5V
High Output Voltage
VOH
Vpin2 = 2.3V, RL = 15kΩ to GND
Low Output Voltage
VOL
Vpin2 = 2.7V, RL = 15kΩ to Pin 8
CURRENT SENSE SECTION
Gain
GV
(Note 1 & 2)
Maximum Input Signal
VI(MAX)
Power Supply Rejection Ratio PSRR
Vpin1 = 5V(Note 1)
12V ≤ VCC ≤ 25V (Note 1,3)
Input Bias Current
IBIAS
-
OUTPUT SECTION
Low Output Voltage
VOL
ISINK = 20mA
ISINK = 200mA
High Output Voltage
VOH
ISOURCE = 20mA
ISOURCE = 200mA
Rise Time
tR
TJ = 25°C, CL= 1nF (Note 3)
Fall Time
tF
TJ = 25°C, CL= 1nF (Note 3)
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
UC3842/UC3844
VTH(ST)
UC3843/UC3845
Min. Operating Voltage
(After Turn On)
UC3842/UC3844
VOPR(MIN)
UC3843/UC3844
Min. Typ. Max. Unit
4.90 5.00 5.10 V
-
6
20 mV
-
6
25 mV
- -100 -180 mA
47
52
57 kHz
- 0.05 1
%
-
1.6
- VP-P
-
-0.1 -2 µA
2.42 2.50 2.58 V
65
90
-
dB
60
70
-
dB
2
7
-
mA
-0.6 -1.0
-
mA
5
6
-
V
-
0.8 1.1 V
2.85 3 3.15 V/V
0.9
1
1.1 V
-
70
-
dB
-
-3 -10 µA
- 0.08 0.4 V
-
1.4 2.2 V
13 13.5 -
V
12 13.0 -
V
-
45 150 ns
-
35 150 ns
14.5 16.0 17.5 V
7.8 8.4 9.0 V
8.5 10.0 11.5 V
7.0 7.6 8.2 V
3
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