UC384XA - UC284XA
Table 5. Electrical Characteristcs
(continued)
( [note 1] Unless otherwise stated, these specifications apply for -25 < T
amb
< 85°C for UC284XA;
0 < T
amb
< 70°C for UC384XA; V
i
= 15V (note 5); R
T
= 10K; C
T
= 3.3nF)
Symbol
Parameter
Test Condition
UC284XA
Min.
Typ.
0.1
1.6
13
12
13.5
13.5
0.7
50
50
(2)
UC384XA
Min.
Typ.
0.1
1.6
13
12
1.2
150
150
13.5
13.5
0.7
50
50
1.2
150
150
Max.
0.4
2.2
Max.
0.4
2.2
Unit
OUTPUT SECTION
V
OL
V
OH
V
OLS
t
r
t
f
Output Low Level
Output High Level
UVLO Saturation
Rise Time
Fall Time
I
SINK
= 20mA
I
SINK
= 200mA
I
SOURCE
= 20mA
I
SOURCE
= 200mA
V
CC
= 6V; I
SINK
= 1mA
T
j
= 25°C
C
L
= 1nF
(2)
T
j
= 25°C
C
L
= 1nF
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
Min Operating Voltage
After Turn-on
PWM SECTION
Maximum Duty Cycle
Minimum Duty Cycle
TOTAL STANDBY CURRENT
I
st
Start-up Current
V
i
= 6.5V for UCX843A/
45A
V
i
= 14V for UCX842A/44A
I
i
V
iz
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
X842A/3A
X844A/5A
94
47
96
48
100
50
0
94
47
96
48
100
50
0
%
%
%
X842A/4A
X843A/5A
X842A/4A
15
7.8
9
16
8.4
10
17
9.0
11
14.5
7.8
8.5
16
8.4
10
17.5
9.0
11.5
V
V
V
ns
V
V
V
V
V
ns
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 : A =
∆V
PIN1
/∆V
PIN3
; 0
≤
V
PIN3
≤
0.8V
5. Adjust V
i
above the start threshold before setting at 15 V.
4/16
STMICROELECTRONICS [ STMICROELECTRONICS ]
