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UC3842T Datenblatt(PDF) 4 Page - STMicroelectronics

Teilenummer UC3842T
Bauteilbeschribung  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Notes :
1. Max package power dissipation limits must be respected; low duty cycle pulse techniques are used during test maintain Tj as
close to Tamb as possible.
2. These parameters, although guaranteed, are not 100% tested in production.
3. Parameter measured at trip point of latch with VPIN2 = 0.
4. Gain defined as :
∆ VPIN1
A =
; 0
≤ VPIN3 ≤ 0.8 V
∆ VPIN3
5. Adjust Vi above the start threshold before setting at 15 V.
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Conditions
Value
Unit
Min.
Typ.
Max.
OUTPUT SECTION
VOL
Output Low Level
ISINK = 20mA
0.1
0.4
V
ISINK = 200mA
1.6
2.2
V
VOH
Output High Level
ISOURCE = 20mA
13
13.5
V
ISOURCE = 200mA
12
13.5
V
VOLS
UVLO Saturation
VCC = 6V; ISINK = 1mA
0.1
1.1
V
tr
Rise Time
Tj = 25
°C CL = 1nF (2)
50
150
ns
tf
Fall Time
Tj = 25
°C CL = 1nF (2)
50
150
ns
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
UC3842T/4T
15
16
17
V
UC3843T/5T
7.8
8.4
9.0
V
Min Operating Voltage
After Turn-on
UC3842T/4T
9
10
11
V
UC3843T/5T
7.0
7.6
8.2
V
PWM SECTION
Maximum Duty Cycle
UC3842T/3T
94
96
100
%
UC3844T/5T
47
48
50
%
Minimum Duty Cycle
0%
TOTAL STANDBY CURRENT
Ist
Start-up Current
Vi = 6.5V for UC3843T/45T
0.3
0.5
mA
Vi = 14V for UC3842T/44T
0.3
0.5
mA
Ii
Operating Supply Current
VPIN2 = VPIN3 = 0V
12
17
mA
Viz
Zener Voltage
Ii = 25mA
30
36
V
UC3842T - UC3843T - UC3844T - UC3845T
4/15


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