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PDF ( 数据手册 , 数据表 ) LX1562

零件编号 LX1562
描述 SECOND-GENERATION POWER FACTOR CONTROLLER
制造商 Microsemi Corporation
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LX1562 数据手册, 描述, 功能
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
1M
1%
R7
47
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 1.3
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







LX1562 pdf, 数据表
LX1562/1563
PRODUCT DATABOOK 1996/1997
SECOND-GENERATION POWER FACTOR CONTROLLER
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 5. E.A. INPUT BIAS CURRENT vs. TEMPERATURE
0.5
0.4
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
-50
VCC = 12V
CL = 1nF
E.A.- = 2.5V
-25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 6. E.A. SINK CURRENT @2V vs. TEMPERATURE
6.0
VCC = 12V
5.5 CL = 1nF
VEA0 = 2V
5.0
4.5
4.0
3.5
3.0
-50
-25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 7. START-UP SUPPLY CURRENT vs. TEMPERATURE
350.0
300.0
250.0
LX1563
VIN < VTH
CL = 1nF
200.0
150.0
100.0
50.0
0.0
-50
-25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 8. START-UP SUPPLY CURRENT vs. TEMPERATURE
350.0
300.0
250.0
LX1562
VIN < VTH
CL = 1nF
200.0
150.0
100.0
50.0
0.0
-50
-25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
8 Copyright © 1996
Rev. 1.3 12/96







LX1562 equivalent, schematic
LX1562/1563
PRODUCT DATABOOK 1996/1997
SECOND-GENERATION POWER FACTOR CONTROLLER
PRODUCTION DATA SHEET
IC DESCRIPTION
CURRENT DETECT LOGIC (continued)
upper 7.8V clamp prevents input overvoltage breakdown dur-
ing switch off time, while during the on time the lower 0.7V
clamp prevents substrate injection. An internal current limit
resistor protects the lower clamp transistor in case the “IDET” pin
is accidently shorted to ground.
START-UP TIMER
A start-up timer circuit eliminates the need for an external os-
cillator when used in stand alone applications. The timer, as
shown in Figure 30, provides a means to automatically start the
pre converter if the latch output Q comes up in a wrong (HI)
state. The timer capacitor ramps up and resets the latch to a
low state, turning the output driver on.
OUTPUT DRIVER STAGE
The LX1562/63 output driver is designed for direct driving of
an external power MOSFET. It is a totem pole stage with
±500mA peak current capability. This typically results in a
130ns rise and fall times into a 1000pF capacitive load. Addi-
tionally the output is held low during the undervoltage condi-
tion to ensure that the MOSFET remains in the off state until
supply voltage reaches the start-up threshold.
Internal voltage clamping ensures that output driver is al-
ways lower than 13.8V (typ.) when supply voltage variation
exceeds more than rated VGS threshold (typ 20V) of the exter-
nal MOSFET. This eliminates an external zener diode and extra
power dissipation associated with it that otherwise is required
for reliable circuit operation.
L1
IDEF 300
5
L1
1.72V
R
VREF C.S.
Q
VTIMER
S
C.S. Latch
1µs
Delay
Q
HI
C.S.
OUT
7
C.S.
4
VM0
FIGURE 30 — START-UP TIMER & CURRENT DETECT LOGIC CIRCUITRY
16 Copyright © 1996
Rev. 1.3 12/96










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