uc3842td STMicroelectronics, uc3842td Datasheet - Page 4

• Manufacturer Part Number: uc3842td
• Description: High Performance Current Mode Pwm Controller
• Manufacturer: STMicroelectronics

Notes : 1. Max package power dissipation limits must be respected; low duty cycle pulse techniques are used during test maintain T
UC3842T - UC3843T - UC3844T - UC3845T
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
PIN1
PIN3
above the start threshold before setting at 15 V.
amb
as possible.
Parameter
; 0 V
PIN3
0.8 V
I
I
ISOURCE = 20mA
I
VCC = 6V; I
T
T
UC3842T/4T
UC3843T/5T
UC3842T/4T
UC3843T/5T
UC3842T/3T
UC3844T/5T
V
V
V
I
SINK
SINK
SOURCE
i
j
j
i
i
PIN2
= 25mA
PIN2
= 25 C C
= 25 C C
= 6.5V for UC3843T/45T
= 14V for UC3842T/44T
= 20mA
= 200mA
= 0.
= V
Test Conditions
= 200mA
PIN3
SINK
L
L
= 0V
= 1nF (2)
= 1nF (2)
= 1mA
Min.
7.8
7.0
12
94
47
30
13
15
9
Value
Typ.
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
Max.
150
150
100
0.4
2.2
1.1
9.0
8.2
0.5
0.5
17
11
50
17
0
j
Unit
as
mA
mA
mA
ns
ns
%
%
%
V
V
V
V
V
V
V
V
V
V