UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
ELECTRICAL CHARACTERISTICS
(continued)
Symbo l
OUTPUT SECTION
V
OL
V
OH
V
OLS
t
r
t
f
Output Low Level
I
SINK
= 20mA
I
SINK
= 200mA
Output High Level
I
SOURCE
= 20mA
I
SOURCE
= 200mA
UVLO Saturation
Rise Time
Fall Time
Start Threshold
V
CC
= 6V; I
SINK
= 1mA
T
j
= 25
°
C C
L
= 1nF (2)
T
j
= 25°C C
L
= 1nF (2)
X842A/4A
X843A/5A
Min Operating Voltage
After Turn-on
PWM SECTION
Maximum Duty Cycle
X842A/3A
X844A/5A
Minimum Duty Cycle
TOTAL STANDBY CURRENT
I
st
I
i
V
iz
Start-up Current
V
i
= 6.5V for UCX843A/45A
V
i
= 14V for UCX842A/44A
Operating Supply Current
Zener Voltage
V
PIN2
= V
PIN3
= 0V
I
i
= 25mA
30
0.3
0.3
12
36
0.5
0.5
17
30
0.3
0.3
12
36
0.5
0.5
17
mA
mA
mA
V
94
47
96
48
100
50
0
94
47
96
48
100
50
0
%
%
%
X842A/4A
X843A/5A
15
7.8
9
7.0
13
12
0.1
1.6
13.5
13.5
0.7
50
50
16
8.4
10
7.6
1.2
150
150
17
9.0
11
8.2
14.5
7.8
8.5
7.0
0.4
2.2
13
12
0.1
1.6
13.5
13.5
0.7
50
50
16
8.4
10
7.6
1.2
150
150
17.5
9.0
11.5
8.2
0.4
2.2
V
V
V
V
V
ns
ns
V
V
V
V
Parameter
T est Cond itions
UC284XA
UC384XA
Min . Typ . Max. Min. T yp. Max.
Un it
UNDER-VOLTAGE LOCKOUT SECTION
Notes :
1. Max package power dissipation limits must be respected; low duty cycle pulse techniques are used during test maintain T
j
as
close to T
amb
as possible.
2. These parameters, although guaranteed, are not 100% tested in production.
3. Parameter measured at trip point of latch with V
PIN2
= 0.
4. Gain defined as :
∆
V
PIN1
A=
; 0
≤
V
PIN3
≤
0.8 V
∆
V
PIN3
5. Adjust V
i
above the start threshold before setting at 15 V.
4/15
STMICROELECTRONICS [ STMICROELECTRONICS ]
