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L4981 Datasheet(PDF) 11 Page - STMicroelectronics

No. de pieza L4981
Descripción Electrónicos  POWER FACTOR CORRECTOR
PDF  17 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4981 Datasheet(HTML) 11 Page - STMicroelectronics

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Figure 16: Programmable Under Voltage Lock-
out Thresholds
Table 1: Programmable Under Voltage Lockout Thresholds.
VCC ON
VCC OFF
R22
R23
11V
10V
82k
Ω
12k
Ω
12V
10.1V
220k
Ω
33k
Ω
13V
10.5V
430k
Ω
62k
Ω
14V
10.8V
909k
Ω
133k
Ω
14.5V
10.9V
1.36M
Ω
200k
Ω
15V
11V
2.7M
Ω
390k
Ω
Vl
0.8
1
0.4
0.2
0
0
45
90
135
Electrical degrees
180
0.8
1
0.4
0.2
0
fsw
Figure 17: Modulation Frequency Normalized in
an Half Cycle of the Mains Voltage
Figure 18: Oscillator Diagram
R22 = R23
⋅ 6.8
R23 (Kohm)
L4981A - L4981B
11/17



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