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STMicroelectronics Electronic Components Datasheet

L4981 Datasheet

POWER FACTOR CORRECTOR

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L4981 pdf
L4981A
® L4981B
POWER FACTOR CORRECTOR
CONTROL BOOST PWM UP TO 0.99P.F.
LIMIT LINE CURRENT DISTORTION TO < 5%
UNIVERSAL INPUT MAINS
FEED FORWARD LINE AND LOAD REGULA-
TION
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 HYS-
TERESIS AND PROGRAMMABLE TURN ON
THRESHOLD
OVERVOLTAGE, OVERCURRENT PROTEC-
TION
PRECISE 2% ON CHIP REFERENCE EX-
TERNALLY AVAILABLE
SOFT START
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-
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
DIP20
SO20
ORDERING NUMBERS: L4981X (DIP20)
L4981XD (SO20)
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-
September 1998
1/17


STMicroelectronics Electronic Components Datasheet

L4981 Datasheet

POWER FACTOR CORRECTOR

No Preview Available !

L4981 pdf
L4981A - L4981B
put filter; both the operating frequency modes
working with an average current mode PWM con-
troller, maintaining sinusoidal line current without
slope compensation.
Besides power MOSFET gate driver, precise volt-
age reference (externally available), error ampli-
fier, undervoltage lockout, current sense and the
soft start are included. To limit the number of the
external components, the device integrates pro-
tections as overvoltage and overcurrent. The
overcurrent level can be programmed using a
simple resistor for L4981A. For a better precision
and for L4981B an external divider must be used.
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
IGDRV
VGDRV
VVA-OUT
IAC
VCA-OUT
VROSC
ICOSC
IFREQ-MOD
VSYNC
VIPK
Ptot
Top
Tstg
Pin Parameter
19 Supply Voltage (ICC 50mA) (*)
20 Gate driv. output peak current (t = 1µs)
SINK
. SOURCE
Gate driv. output voltage t = 0.1µs
Voltages at pins 3, 14, 7, 6, 12, 15
13 Error Amplifier Voltage
4 AC Input Current
Voltages at pin 8, 9
5 Current Amplifier Volt. (Isource = -20mA; Isink = 20mA)
17 Voltage at pin 17
11, 18 Voltage at pin 11, 18
18 Input Sink Current
16 Frequency Modulation Sink Current (L4981B)
16 Sync. Voltage (L4981A)
2 Voltage at pin 2
Voltage at Pin 2 t = 1µs
Power Dissipation at Tamb = 70°C
Power Dissipation at Tamb = 70°C
Operating Ambient Temperature
(DIP20)
(SO20)
StorageTemperature
(*) Maximum package power dissipation limits must be observed.
PIN CONNECTIONS (Top views)
Value
selflimit
2
1.5
-1
-0.3 to 9
-0.3 to 8.5
5
-0.5 to 7
-0.3 to 8.5
-0.3 to 3
-0.3 to 7
15
5
-0.3 to 7
-0.3 to 5.5
-2
1
0.6
-40 to 125
-55 to 150
Unit
V
Α
A
V
V
V
mA
V
V
V
V
mA
mA
V
V
V
W
W
°C
°C
L4981A
L4981B
2/17


Part Number L4981
Description POWER FACTOR CORRECTOR
Maker STMicroelectronics
Total Page 17 Pages
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