L4981B - ST Microelectronics

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

L4981B
Manufacturer

ST Microelectronics
ChipWorker Part#

CW41732971
Category

Power Management IC
Package

DIP-20
Description

Power Factor Correction PWM CONTRLR 0.3mA 115kHz 20Pin PDIP Tube
Documentation

Datasheet

L4981B Global Supplier

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L4981B Specifications

Attribute	Attribute Value

Part Number	L4981B
Manufacturer	ST Microelectronics
ChipWorker Part#	CW41732971
Category	Power Management IC
Documentation	Datasheet
Mounting Style	Through Hole
Number of Pins	20 Pin
Case/Package	DIP-20
Frequency	80 kHz
Supply Voltage (DC)	12.0V (min)
Number of Outputs	1 Output
Input Voltage (DC)	19.5 V
Output Voltage	7.50 V
Output Current	1.50 A
Number of Positions	20 Position
Power Dissipation	1.00 W
Switching Frequency	100 kHz
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
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Size-Length	25.4 mm
Size-Width	7.1 mm
Size-Height	2.68 mm
Operating Temperature	-40℃ ~ 125℃
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
ECCN Code	EAR99

Product Description

The L4981B is a Power Factor Corrector 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 any line switch. This new PFC offers modulated frequency optimizing the size of the input filter; the operating frequency mode working with an average current-mode PWM controller, maintaining sinusoidal line current without slope compensation. Besides power MOSFET gate driver, precise voltage reference (externally available), error amplifier, under-voltage lockout, current sense and the soft start are included. To limit the number of the external components, the device integrates protections as overvoltage and overcurrent.
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 totem pole output
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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