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PDF LX1562 Data sheet ( Hoja de datos )
| Número de pieza | LX1562 | |
| Descripción | SECOND-GENERATION POWER FACTOR CONTROLLER | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N DO C # : 1562
LX1562/1563
SECOND-GENERATION POWER FACTOR CONTROLLER
PRODUCTION DATA SHEET
DESCRIPTION
The LX1562 is a second-generation
family of power factor correction
controllers using a discontinuous mode
of operation. They are optimized for
electronic ballast applications. Many
improvements have been made over
the original SG3561A controller
introduced by Silicon General Semicon-
ductor in 1992.
New features include the addition of
an internal start-up circuit eliminating
bulky external components while
allowing independent boost converter
operation. Addition of internal current
sense blanking eliminating the need for
an external R/C filter network. Internal
clamping of the error amplifier and
multiplier outputs improves turn on
overshoot characteristics and current
limiting. Special circuitry has also been
added to prevent no load runaway
conditions. And finally, output drive
clamps limiting power MOSFET gate
drive independent of supply voltage
greatly enhance the products practical
application.
Although the IC design has been
optimized for electronic ballast applica-
tions, it can also be used for power
factor correction in lower power (typ <
300W) AC-DC converters. One unique
feature of the device is encompassed
by the addition of internal logic
circuitry to detect zero crossing of the
inductor current thus maintaining the
discontinuous current mode of opera-
tion. This feature prevents large
current gaps from appearing thereby
minimizing distortion and enhancing
power factor correction.
PRODUCT HIGHLIGHT
TYPICAL APPLICATION OF THE LX1562 IN AN 80W
FLUORESCENT LAMP BALLAST WITH ACTIVE POWER FACTOR CONTROL
AC+
120V
AC
AC-
450µH
61T #22AWG
MR854
VBOOST
230V
D1 D3
100k L1
½W
R3
7T
R4
22k
D7
D5 1N4935
R1
2.2M
1%
C1 1µF
250V
C2
22µF
R10
4.7M
D6
8 5 1N4148
VIN IDET
1MΩ
1%
R7
47Ω
OUT 7 R5
R9 620k
Q1
1RF730
C6
100µF
MULT
3 IN
COMP 2
C5
400V
D2
D4
R2
29k
1%
C4
C3
.01µF
GND
INV 1
C.S. 4
0.1µF
11k
1%
R8
3x R6
6 1/4W 1.3Ω
KEY FEATURES
s INTERNAL START-UP CIRCUIT
s INTERNAL CURRENT SENSE BLANKING
s IMPROVED MICROPOWER START-UP
CURRENT (300µA max.)
s CLAMPED E.A. OUTPUT FOR LOWER
TURN-ON OVERSHOOT
s MULTIPLIER CLAMP LIMITS MAXIMUM
INPUT CURRENT
s INTERNAL OVERVOLTAGE PROTECTION
REPLACES BUILT-IN C.S. OFFSET
s PWM OUTPUT CLAMP LIMITS MOSFET
GATE DRIVE VOLTAGE
s INCREASED UVLO HYSTERESIS REDUCES
START-UP TIMING (LX1562 only)
s LOW OPERATING CURRENT CONSUMPTION
s INTERNAL 1.5% REFERENCE
s TOTEM POLE OUTPUT STAGE
s AUTOMATIC CURRENT LIMITING OF BOOST
STAGE
s DISCONTINUOUS MODE OF OPERATION
WITH NO CURRENT GAPS
s NO SLOPE COMPENSATION REQUIRED
A P P L I C AT I O N S
s ELECTRONIC BALLAST
s SWITCHING POWER SUPPLIES
A VA I L A B L E O P T I O N S P E R PA R T #
Part #
Start-Up
Voltage
Hysteresis
Voltage
LX1562
13.1V
5.2V
LX1563
9.8V
2.1V
Note: Thick trace on schematic shows high-frequency, high-current path in circuit.
Lead lengths must be minimized to avoid high-frequency noise problems.
Copyright © 1996
Rev. 1.3 12/96
PACKAGE ORDER INFORMATION
TA (°C)
M
Plastic DIP
8-pin
DM
Plastic
8-pin
SOIC
0 to 100
0 to 100
LX1562IM
LX1563IM
LX1562IDM
LX1563IDM
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX1562IDMT)
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
1 page  
PRODUCT DATABOOK 1996/1997
SECOND-GENERATION POWER FACTOR CONTROLLER
PRODUCTION DATA SHEET
LX1562/1563
BLOCK DIAGRAM / PIN DESCRIPTIONS
VIN
8
L1
5.2V (1562)
2.1V (1563)
MULT
IN
3
13.1V (1562)
9.8V (1563)
Internal
Bias
2.5V
REF
VREF
6.8V To All
Internal Circuitry
M1
1.24V
AC
Input
EMI
Filter
M2
IDET 300Ω
5
L1
1.72V
UVLO
C.S.
R LATCH
VREF
Q
VTIMER
S
Q
1µs
Delay
1.8V
C1
L1
VREF D1
E.A. INV.
1
2
E.A. OUT
VIN
OUT
7
C.S.
C.S. 4
FUNCTIONAL DESCRIPTION
Pin # Description
VIN
GND
8 Input supply voltage.
6 Input supply voltage return. Must always be the lowest potential of all the pins.
INV 1 Inverting input of the Error Amplifier. The output of the Boost converter should be resistively divided to 2.5V and
connected to this pin.
E.A. OUT 2 The output of the Error Amplifier. A feedback compensation network is placed between this pin and the INV pin.
MULT IN 3 Input to the multiplier stage. The full-wave rectified AC is divided to less than 2V and is connected to this pin.
C.S. 4 Input to the PWM comparator. Current is sensed in the Boost stage MOSFET by a resistor in the source lead, and is
fed to this pin. An internal blanking circuit eliminates the RC low pass filter that otherwise is required to eliminate leading
edge spike.
IDET 5 A current driven logic input with internal clamp.
A second winding on the Boost inductor senses the flyback voltage associated with the zero crossing of the inductor
current and feeds it to the IDET pin through a limiting resistor. Low on this pin causes VO (pin 7) to go high.
OUT 7 PWM output pin. A totem-pole output stage specially designed for direct driving the MOSFET.
Copyright © 1996
Rev. 1.3 12/96
5
5 Page 
PRODUCT DATABOOK 1996/1997
SECOND-GENERATION POWER FACTOR CONTROLLER
PRODUCTION DATA SHEET
LX1562/1563
CHARACTERISTIC CURVES
FIGURE 17. — C.S. BLANKING TIME vs. TEMPERATURE
1000
900
800
700
600
500
400
300
-50
-25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 18. — RESTART TIME vs. TEMPERATURE
600
500 VCC = 12V
C.S. = Pulse
400
300
200
100
0
-50 -25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 19. — FALL TIME vs. TEMPERATURE
90
VCC = 12V, CL = 2200pF
80
70
60
50
40
30
20
-50
-25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 20. — RISE TIME vs. TEMPERATURE
200
180 VCC = 12V
CL = 2200pF
160
140
120
100
80
60
40
-50
-25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
Copyright © 1996
Rev. 1.3 12/96
11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet LX1562.PDF ] | |
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