E-L4981A Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
E-L4981A Datasheet PDF : 16 Pages
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L4981A - L4981B
Figure 16: Programmable Under Voltage Lock-
out Thresholds
R22 = R23 ⋅ 6.8
R23 (Kohm)
Figure 17: Modulation Frequency Normalized in
an Half Cycle of the Mains Voltage
Vl
1
fsw
1
0.8
0.8
0.4
0.4
0.2
0.2
0
0
0
45
90
135
180
Electrical degrees
Table 1: Programmable Under Voltage Lockout Thresholds.
VCC ON
11V
12V
13V
14V
14.5V
15V
VCC OFF
10V
10.1V
10.5V
10.8V
10.9V
11V
R22
82kΩ
220kΩ
430kΩ
909kΩ
1.36MΩ
2.7MΩ
R23
12kΩ
33kΩ
62kΩ
133kΩ
200kΩ
390kΩ
Figure 18: Oscillator Diagram
10/16
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