L4981B STMicroelectronics, L4981B Datasheet - Page 10

• Manufacturer Part Number: L4981B
• Description: IC PFC CTRLR AVERAGE CURR 20DIP
• Manufacturer: STMicroelectronics

Specifications of L4981B

• Mode: Average Current
• Frequency - Switching: 100kHz
• Current - Startup: 100µA
• Voltage - Supply: 14.5 V ~ 19.5V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• Switching Frequency: 115 KHz
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 40 C
• Supply Voltage Range: 12V To 19.5V
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +125°C
• Ic Generic Number: 4981
• Output Current Max: 300µA
• Rohs Compliant: Yes
• Input Voltage: 19.5V
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5337-5; L4981B

L4981A - L4981B
Figure 16: Programmable Under Voltage Lock-
Table 1: Programmable Under Voltage Lockout Thresholds.
Figure 18: Oscillator Diagram
10/16
V
14.5V
CC ON
11V
12V
13V
14V
15V
out Thresholds
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
220k
430k
909k
2.7M
82k
R22
an Half Cycle of the Mains Voltage
45
90
133k
200k
390k
12k
33k
62k
135
R23
Electrical degrees
fsw
180
0.2
0.8
0.4
1
0