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PDF L4981B Data sheet ( Hoja de datos )

Número de pieza L4981B
Descripción POWER FACTOR CORRECTOR
Fabricantes STMicroelectronics 
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No Preview Available ! L4981B Hoja de datos, Descripción, Manual

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-
November 2001
1/16

1 page




L4981B pdf
L4981A - L4981B
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
SUPPLY VOLTAGE
VCC Operating Supply Voltage
OVER VOLTAGE PROTECTION COMPARATOR
Vthr Rising Threshold Voltage
Test Condition
V3Hys
Hysteresis
I3 Input Bias Current
td Propagation delay to output
VOVP = Vthr +100mV
OVER CURRENT PROTECTION COMPARATOR
Vth Threshold Voltage
td Propagation delay to Output
VOCP = Vthr -0.2V
Iipk Current Source Generator
VIPK = -0.1V only for L4981A
IL Leakage Current
CURRENT AMPLIFIER SECTION
VIPK = -0.1V only for L4981B
Voffset
Input Offset Voltage
VMULT OUT = VSENSE = 3.5V
I9bias
Input Bias Current
Open Loop Gain
VSENSE = 0V
1.1V VCA OUT 6V
SVR
Supply Voltage Rejection
12V VCC 19V
VMULT OUT = 3.5V VSENSE = 3.5V
V5H Output High Voltage
VMULT OUT = 200mV
ICA OUT = -0.5mA, VIAC = 0V
V5L Output Low Voltage
VMULT OUT = -200mV
ICA OUT = 0.5mA, VIAC = 0V
-I5 Output Source Current
I5 Output Sink Current
VMULT OUT = 200mV,
VIAC = 0V, VCA-OUT = 3.5V
OUTPUT SECTION
V20L
V20H
Output Voltage Low
Output Voltage High
ISINK = 250mA
ISOURCE = 250mA
VCC = 15V
tr Output Voltage Rise Time
COUT = 1nF
tf Output Voltage Fall Time
VGDRV
Voltage Clamp
TOTAL STANDBY CURRENT SECTION
COUT = 1nF
ISOURCE = 0mA
I19start
Supply Current before start up
VCC = 14V
I19on Supply Current after turn on
VIAC = 0V, VCOSC = 0,
Pin17 = Open
I19 Operating Supply Current
Pin20 = 1nF
VCC Zener Voltage
UNDER VOLTAGE LOCKOUT SECTION
(*)
Vth ON
Turn on Threshold
Vth OFF Turn off Threshold
Programmable Turn-on Threshold Pin 15 to VCC = 220K
Pin15 to GND = 33K
LOAD FEED FORWARD
ILFF Bias Current
V6 = 1.6V
V6 = 5.3V
VI Input Voltage Range
(*) Maximum package power dissipation limits must be observed.
Min. Typ. Max. Unit
19.5 V
Vref
-20mV
180
5.1
250
0.05
1
Vref
+20mV
320
1
2
V
mV
µA
µs
±30 mV
0.4 0.9 µs
65 85 105 µA
5 µA
±2 mV
-500 50 500 nA
70 100
dB
68 90
dB
6.2 V
0.9 V
2 10
2 10
mA
mA
0.5
11.5 12.5
0.8
50 150
30 100
13 16 19
V
V
ns
ns
V
0.3 0.5 mA
8 12 mA
12 16 mA
20 25 30
V
14.5
9
10.6
15.5
10
12
16.5
11
13.4
V
V
V
70 140 µA
200 300 µA
1.6 5.3 V
5/16

5 Page





L4981B arduino
L4981A - L4981B
Figure 19: Demo Board Circuit (VO = 400V; PO = 360W).
F1
T15A250V
88 to 264 Vac
BRIDGE
B1 8A
Cf
.22uF
600V
RAux1
**
RAux2
B2= D1+D2
+D8+D9
R14
68
Dz1
18V
VCC
C10
150uF
D4-STTH8R06
to220 (/40CW)
NTC
2.5
V+ BUS=400V
C2
330n
C3
330n
R2
33k
R4
1.2M
R5
220k
R6
500k
R7
500k
R11
56k
R12
56k
L1=0.5mE42*21*15
gap=1.9 58/6 turns
20*.2mm
VCC
C11
220n
D5-
STTA106
D6
DZW06-48
C8
100n
R16
220k
R19
L2
3u C14
750k
R18
6.8
R22
750k
100n
2W
D7-STTA406
R20
750k
R23
750k
C1
330nF
400V
15
16
2
TP1
R1
460
741
19
13 14
3
L4981A/ B**
85
R10
5k
9 18 10
20
6
17 12 11
R3 R8 C6
2.2k 17k 3.3n
C9 R15
1n 24k
R13
2.2k
C12
1u
D3
R17
15
Q1+Q2#
C13
1u
Cs
330pF
Q4
4007
R21
19.6k
R25
1k
2W
R24
16.9k
C15
220uF
450V
-
R9 (RS)
50m
// 3*0.15)
# // Q1&Q2
TO220*2
STM12NM50
/ 7C/W
Figure 20: Component Layout (Dimensions 88 x 150mm).
11/16

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