UC3844B STMicroelectronics, UC3844B Datasheet - Page 4

• Manufacturer Part Number: UC3844B
• Description: Current Mode PWM
• Manufacturer: STMicroelectronics

Notes : 1. Max package power dissipation limits must be respected; low duty cycle pulse techniques are used during test maintain T
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
ELECTRICAL CHARACTERISTICS (continued)
4/15
OUTPUT SECTION
UNDER-VOLTAGE LOCKOUT SECTION
PWM SECTION
TOTAL STANDBY CURRENT
Symbol
V
V
V
V
I
OLS
t
OH
t
I
OL
st
r
f
i
iz
2. These parameters, although guaranteed, are not 100% tested in production.
3. Parameter measured at trip point of latch with V
4. Gain defined as :
5. Adjust V
close to T
A =
Output Low Level
Output High Level
UVLO Saturation
Rise Time
Fall Time
Start Threshold
Min Operating Voltage
After Turn-on
Maximum Duty Cycle
Minimum Duty Cycle
Start-up Current
Operating Supply Current
Zener Voltage
V
V
i
above the start threshold before setting at 15 V.
PIN1
PIN3
amb
Parameter
as possible.
; 0 V
PIN3
0.8 V
I
I
I
T
T
X842B/4B
X843B/5B
X842B/4B
X843B/5B
X842B/3B
X844B/5B
V
V
V
I
VCC = 6V; I
I
SINK
SINK
SOURCE
SOURCE
i
j
j
i
i
PIN2
= 25mA
= 25 C C
= 25 C C
= 6.5V for UCX843B/45B
= 14V for UCX842B/44B
Test Conditions
= 20mA
= 200mA
= V
PIN2
= 20mA
= 200mA
PIN3
= 0.
SINK
L
L
= 0V
= 1nF (2)
= 1nF (2)
= 1mA
Min. Typ. Max. Min. Typ. Max.
7.8
7.0
13
12
15
94
47
30
9
UC284XB
13.5
13.5
0.1
1.6
0.1
8.4
7.6
0.3
0.3
50
50
16
10
96
48
12
36
150
150
100
0.4
2.2
1.1
9.0
8.2
0.5
0.5
17
11
50
17
0
14.5
7.8
8.5
7.0
13
12
94
47
30
UC384XB
13.5
13.5
1.6
0.1
0.1
8.4
7.6
0.3
0.3
50
50
16
10
96
48
12
36
17.5
11.5
150
150
100
0.4
2.2
1.1
9.0
8.2
0.5
0.5
50
17
0
j
Unit
as
mA
mA
mA
ns
ns
%
%
%
V
V
V
V
V
V
V
V
V
V