UC3842A/UC3843A
Electrical Characteristics (Continued)
(V
CC
= 15V, R
T
= 10KΩ, C
T
= 3.3nF, T
A
= 0°C to + 70°C, Unless otherwise specified)
Parameter
ERROR AMPLIFIER SECTION
Input Voltage
Input Bias Current
Open Loop Gain
Unity Gain Bandwidth
PSRR
Output Sink Current
Output Source Current
Output High Voltage
Output Low Voltage
OUTPUT SECTION
Output Low Level
Output High Level
Rise Time
Fall Time
Output Voltage Swing Limit
V
OL
V
OH
t
R
t
F
V
OLIM
I
SINK
= 20mA
I
SINK
= 200mA
I
SOURCE
= 20mA
I
SOURCE
= 200mA
T
J
= 25°C, C1 = 1nF (NOTE 1)
T
J
= 25°C, C1 = 1nF (NOTE 1)
V
CC
= 27V, C1 = 1nF
UC3842A
UC3843A
UC3842A
UC3843A
UC3842A/UC3843A
-
-
V
PIN2
= V
PIN3
= 0V
I
CC
= 25mA
-
-
13
12
-
-
-
15
7.8
9
7.0
94
-
-
-
-
0.1
1.5
13.5
13.5
40
40
22
16
8.4
10
7.6
96
-
0.2
11
29
0.4
2.2
-
-
100
100
-
17
9.0
11
8.2
100
0
0.4
17
-
V
V
V
V
ns
ns
V
V
V
V
V
%
%
mA
mA
V
V
I
I
BIAS
G
VO
GBW
PSRR
I
SINK
I
SOURCE
V
OH
V
OL
T
PIN1
= 2.5V
-
V
O
= 2V to 4V (NOTE 1)
T
J
= 25°C (NOTE 1)
V
CC
= 12V to 25V (NOTE 1)
V
PIN2
= 2.7V
V
PIN1
= 1.1V
V
PIN2
= 2.3V
V
PIN1
= 5.0V
V
PIN2
= 2.3V
R1 = 15KΩ to GND
V
PIN2
= 2.7V
R1 = 15KΩ to Pin8
2.42
-
65
0.7
60
2
-0.5
5
-
2.50
-0.3
90
1
70
6
-0.8
6
0.8
2.58
-2
-
-
-
-
-
-
1.1
V
uA
dB
MHz
dB
mA
mA
V
V
Symbol
Conditions
Min.
Typ.
Max.
Unit
UNDER VOLTAGE LOCKOUT SECTION
Start Threshold
Min. Operating Voltage
( After turn on )
PWM SECTION
Maximum Duty Cycle
Minimum Duty Cycle
TOTAL STANDBY CURRENT
Start-Up Current
Operating Supply Current
V
CC
Zener Voltage
I
ST
I
CC
V
Z
D
MAX
D
MIN
V
TH
V
TL
* Adjust V
CC
above the start threshold before setting at 15V
Notes :
1. These parameters, although guaranteed, are not 100% tested in production.
2. Parameter measured at trip point of latch with V2 = 0V.
3. Gain defined as: G
V
=
∆V
PIN1
∆V
PIN3
(V
PIN3
= 0 to 0.8V)
3
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
