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Updated at 01/11/2025 10:30:15(UTC+8)

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Description

DESCRIPTION
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 con
trol functions for designing a high efficiency-mode power supply with sinusoidal line current con
sumption.
The L4981 can be easily used in systems with mains voltages between 85V to 265V without any
line switch. This new PFC offers the possibility to work at fixed frequency (L4981A) or modulated
frequency (L4981B) optimizing the size of the in put filter; both the operating frequency modes
working with an average current mode PWM controller, maintaining sinusoidal line current without
slope compensation.
CONTROL BOOST PWM UP TO 0.99P.F.
LIMIT LINE CURRENT DISTORTION TO < 5%
UNIVERSAL INPUT MAINS
FEED FORWARD LINE AND LOAD REGULATION
AVERAGE CURRENT MODE PWM FOR MINIMUM NOISE SENSITIVITY
HIGH CURRENT BIPOLAR AND DMOS TO TEM POLE OUTPUT
LOW START-UP CURRENT (0.3mA TYP.)
UNDER VOLTAGE LOCKOUT WITH HYSTERESIS AND PROGRAMMABLE TURN ON THRESHOLD
OVERVOLTAGE, OVERCURRENT PROTECTION
PRECISE 2% ON CHIP REFERENCE EXTERNALLY AVAILABLE
SOFT START

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L4981AD Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Surface Mount
Number of Pins	20 Pin
Case/Package	SOIC-20
Frequency	100 kHz
Supply Voltage (DC)	19.5V (max)
Operating Voltage	14.5V ~ 19.5V
Power Rating	600 mW
Number of Outputs	3 Output
Input Voltage (DC)	19.5 V
Output Voltage	≤800 mV
Output Current	1.50 A
Power Dissipation	0.6 W
Switching Frequency	100 kHz
Thermal Resistance	120 ℃/W
Operating Temperature (Max)	125 ℃
Operating Temperature (Min)	-40 ℃
Supply Voltage	14.5V ~ 19.5V
Supply Voltage (Max)	19.5 V
Supply Voltage (Min)	12 V
Input Voltage	14.5.19.5 V
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Size-Length	13 mm
Size-Width	7.6 mm
Size-Height	2.35 mm
Operating Temperature	-40℃ ~ 125℃
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Contains Lead
REACH SVHC Compliance Edition	2015/12/17
ECCN Code	EAR99

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(Additional charges ($35-$50) may apply for delivery in these areas)
- Delivery date: usually 2 to 7 working days.
- A tracking number will be sent after your order ships.
- Carefully inspected and packed by ManyChip warehouse
- Vacuum packaging
- Anti-static packaging
- Shockproof foam
The terms here are for reference only, the actual terms are subject to the sales quotation.
- Please confirm product specifications when ordering.
- MOQ refers to the minimum order quantity required to purchase each part.
- If you have special ordering instructions, please indicate them on the ordering page.
- Inspection (PSI) will be performed prior to shipment.
- Income Quality Control (IQC), 1000+ qualified dealers.
- Chips are tested by authoritative organizations to ensure the quality, authenticity and safety of your device.
- Decapsulation control
- X-ray control
- XRF inspection
- Electrical testing
- Surface testing
-Digital components warehouse, covering an area of 800 square meters, with constant temperature and humidity

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