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PDF L4981XD Data sheet ( Hoja de datos )
| Número de pieza | L4981XD | |
| Descripción | POWER FACTOR CORRECTOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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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
1 page  
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
Iipk Current Source Generator
IL Leakage Current
CURRENT AMPLIFIER SECTION
VOCP = Vthr -0.2V
VIPK = -0.1V only for L4981A
VIPK = -0.1V only for L4981B
Voffset
I9bias
SVR
Input Offset Voltage
Input Bias Current
Open Loop Gain
Supply Voltage Rejection
V5H Output High Voltage
V5L Output Low Voltage
-I5 Output Source Current
I5 Output Sink Current
OUTPUT SECTION
VMULT OUT = VSENSE = 3.5V
VSENSE = 0V
1.1V ≤ VCA OUT ≤ 6V
12V ≤ VCC ≤ 19V
VMULT OUT = 3.5V VSENSE = 3.5V
VMULT OUT = 200mV
ICA OUT = -0.5mA, VIAC = 0V
VMULT OUT = -200mV
ICA OUT = 0.5mA, VIAC = 0V
VMULT OUT = 200mV,
VIAC = 0V, VCA-OUT = 3.5V
V20L
V20H
Output Voltage Low
Output Voltage High
tr Output Voltage Rise Time
tf Output Voltage Fall Time
VGDRV
Voltage Clamp
TOTAL STANDBY CURRENT SECTION
ISINK = 250mA
ISOURCE = 250mA
VCC = 15V
COUT = 1nF
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
VCC Zener Voltage
UNDER VOLTAGE LOCKOUT SECTION
Pin20 = 1nF
(*)
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
VI Input Voltage Range
V6 = 1.6V
V6 = 5.3V
(*) 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 15.5 16.5
9 10 11
10.6 12 13.4
V
V
V
70 140 µA
200 300 µA
1.6 5.3 V
5/17
5 Page 
Figure 16: Programmable Under Voltage Lock-
out Thresholds
R22 = R23 ⋅ 6.8
R23 (Kohm)
L4981A - L4981B
Figure 17: Modulation Frequency Normalized in
an Half Cycle of the Mains Voltage
1 Vl
fsw
1
0.8 0.8
0.4 0.4
0.2 0.2
00
0 45 90 135 180
Electrical degrees
Table 1: Programmable Under Voltage Lockout Thresholds.
VCC ON
11V
12V
13V
14V
14.5V
15V
VCC OFF
10V
10.1V
10.5V
10.8V
10.9V
11V
R22
82kΩ
220kΩ
430kΩ
909kΩ
1.36MΩ
2.7MΩ
R23
12kΩ
33kΩ
62kΩ
133kΩ
200kΩ
390kΩ
Figure 18: Oscillator Diagram
11/17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet L4981XD.PDF ] | |
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