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UC2842B Datenblatt(PDF) 4 Page - STMicroelectronics

Teilenummer UC2842B
Bauteilbeschribung  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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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
UC284XB
UC384XB
Unit
Min. Typ. Max. Min. Typ. Max.
OUTPUT SECTION
VOL
Output Low Level
ISINK = 20mA
0.1
0.4
0.1
0.4
V
ISINK = 200mA
1.6
2.2
1.6
2.2
V
VOH
Output High Level
ISOURCE = 20mA
13
13.5
13
13.5
V
ISOURCE = 200mA
12
13.5
12
13.5
V
VOLS
UVLO Saturation
VCC = 6V; ISINK = 1mA
0.1
1.1
0.1
1.1
V
tr
Rise Time
Tj = 25
°C CL = 1nF (2)
50
150
50
150
ns
tf
Fall Time
Tj = 25
°C CL = 1nF (2)
50
150
50
150
ns
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
X842B/4B
15
16
17
14.5
16
17.5
V
X843B/5B
7.8
8.4
9.0
7.8
8.4
9.0
V
Min Operating Voltage
After Turn-on
X842B/4B
9
10
11
8.5
10
11.5
V
X843B/5B
7.0
7.6
8.2
7.0
7.6
8.2
V
PWM SECTION
Maximum Duty Cycle
X842B/3B
94
96
100
94
96
100
%
X844B/5B
4748
5047
4850
%
Minimum Duty Cycle
0
0
%
TOTAL STANDBY CURRENT
Ist
Start-up Current
Vi = 6.5V for UCX843B/45B
0.3
0.5
0.3
0.5
mA
Vi = 14V for UCX842B/44B
0.3
0.5
0.3
0.5
mA
Ii
Operating Supply Current
VPIN2 = VPIN3 = 0V
12
17
12
17
mA
Viz
Zener Voltage
Ii = 25mA
30
36
30
36
V
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
4/15


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