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UC2842N Datasheet(PDF) 4 Page - STMicroelectronics

Part # UC2842N
Description  CURRENTMODE PWM CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC2842N Datasheet(HTML) 4 Page - STMicroelectronics

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Notes :
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.
6. Output frequency equals oscillator frequency for the UC3842 and UC3843.
Output frequency is one half oscillator frequency for the UC3844 and UC3845.
ELECTRICAL CHARACTERISTICS (continued)
Symbo l
Parameter
T est Cond ition s
UC284X
UC384X
Unit
Min. T yp. Max. Min. T yp. Max.
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
X842/4
15
16
17
14.5
16
17.5
V
X843/5
7.8
8.4
9.0
7.8
8.4
9
V
Min Operating Voltage
After Turn-on
X842/4
9
10
11
8.5
10
11.5
V
X843/5
7.0
7.6
8.2
7.0
7.6
8.2
V
PWM SECTION
Maximum Duty Cycle
X842/3
93
97
100
93
97
100
%
X844/5
46
48
50
47
48
50
%
Minimum Duty Cycle
0
0
%
TOTAL STANDBY CURRENT
Ist
Start-up Current
0.5
1
0.5
1
mA
Ii
Operating Supply Current
VPIN2 =VPIN3 =0V
11
20
11
20
mA
Viz
Zener Voltage
Ii = 25mA
34
34
V
UC2842/3/4/5-UC3842/3/4/5
4/11


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