L4981X STMicroelectronics, L4981X Datasheet - Page 11

• Manufacturer Part Number: L4981X
• Description: POWER FACTOR CORRECTOR
• Manufacturer: STMicroelectronics

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