Overview
The L4981BD, produced by STMicroelectronics, is a highly advanced power factor corrector (PFC) pre-regulator designed to achieve a very high power factor of up to 0.99. This integrated circuit (IC) is realized in BCD 60II technology and includes all the necessary control functions for designing high-efficiency power supplies with sinusoidal line current consumption. The L4981BD is suitable for systems operating with mains voltages between 85V to 265V without the need for any line switch.
Key Specifications
| Attribute | Value |
|---|---|
| Supply Current - Max | 16 mA |
| Supply Voltage - Max | 19.5 V |
| Operating Temperature Range | -40°C to +125°C |
| Package Style | SOIC-20 |
| Mounting Method | Surface Mount |
| Start-up Current | 0.3 mA (Typ.) |
| Operating Frequency | Up to 80 kHz |
Key Features
- Control boost PWM up to 0.99 power factor
- Limit line current distortion to < 5%
- Universal input mains compatibility
- Feed forward line and load regulation
- Average current mode PWM for minimum noise sensitivity
- High current bipolar and DMOS totem pole output
- Low start-up current (0.3 mA Typ.)
- Under voltage lockout with hysteresis and programmable turn-on threshold
- Overvoltage and overcurrent protection
- Precise 2% on-chip reference externally available
- Soft start
Applications
The L4981BD is ideal for high-efficiency power supply designs, particularly in applications requiring a high power factor and low line current distortion. It is suitable for a wide range of power supply systems, including those used in consumer electronics, industrial equipment, and renewable energy systems.
Q & A
- What is the maximum supply voltage for the L4981BD?
The maximum supply voltage for the L4981BD is 19.5 V.
- What is the operating temperature range of the L4981BD?
The operating temperature range of the L4981BD is -40°C to +125°C.
- What is the package style of the L4981BD?
The package style of the L4981BD is SOIC-20.
- What is the maximum start-up current of the L4981BD?
The maximum start-up current of the L4981BD is 0.3 mA (Typ.).
- Does the L4981BD support overvoltage and overcurrent protection?
Yes, the L4981BD includes overvoltage and overcurrent protection features.
- What is the power factor that the L4981BD can achieve?
The L4981BD can achieve a power factor of up to 0.99.
- Is the L4981BD suitable for universal input mains?
Yes, the L4981BD is compatible with universal input mains.
- Does the L4981BD have a soft start feature?
Yes, the L4981BD includes a soft start feature.
- What is the typical operating frequency of the L4981BD?
The typical operating frequency of the L4981BD can be up to 80 kHz.
- Is the L4981BD RoHS compliant?
Yes, the L4981BD is RoHS compliant with an Ecopack2 grade.
