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Technical Specifications
Parameters and characteristics for this part
| Specification | L4981B |
|---|---|
| Current - Startup | 100 µA |
| Frequency - Switching | 100 kHz |
| Mounting Type | Through Hole |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 C |
| Package / Case | 20-DIP (0.300", 7.62mm) |
| Supplier Device Package | 20-DIP |
| Voltage - Supply [Max] | 19.5 V |
| Voltage - Supply [Min] | 14.5 V |
L4981 Series
L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode
| Part | Frequency - Switching | Package / Case | Mounting Type | Voltage - Supply [Max] | Voltage - Supply [Min] | Operating Temperature [Max] | Operating Temperature [Min] | Current - Startup | Supplier Device Package |
|---|---|---|---|---|---|---|---|---|---|
 STMicroelectronics | 100 kHz | 20-SOIC (0.295" 7.50mm Width) | Surface Mount | 19.5 V | 14.5 V | 125 °C | -40 C | 100 µA | 20-SO |
 STMicroelectronics | 100 kHz | 20-SOIC (0.295" 7.50mm Width) | Surface Mount | 19.5 V | 14.5 V | 125 °C | -40 C | 100 µA | 20-SO |
STMicroelectronics | 100 kHz | 20-SOIC (0.295" 7.50mm Width) | Surface Mount | 19.5 V | 14.5 V | 125 °C | -40 C | 100 µA | 20-SO |
STMicroelectronics | 100 kHz | 20-DIP (0.300" 7.62mm) | Through Hole | 19.5 V | 14.5 V | 125 °C | -40 C | 100 µA | 20-DIP |
 STMicroelectronics | 100 kHz | 20-SOIC (0.295" 7.50mm Width) | Surface Mount | 19.5 V | 14.5 V | 125 °C | -40 C | 100 µA | 20-SO |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | N/A | 0 | $ 0.00 | |
Description
General part information
L4981 Series
The L4981 I.C. provides the necessary features to achieve a very high power factor up to 0.99.
Realized in BCD 60II technology this power factor corrector (PFC) pre-regulator contains all the control functions for designing a high efficiency-mode power supply with sinusoidal line current consumption.
The L4981 can be easily used in systems with mains voltages between 85V to 265V without anyline switch. This new PFC offers the possibility to work at fixed frequency (L4981A) or modulated frequency (L4981B) optimizing the size of the input filter; both the operating frequency modes working with an average current mode PWM controller, maintaining sinusoidal line current without slope compensation.
Documents
Technical documentation and resources