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PDF LC5200 Data sheet ( Hoja de datos )
| Número de pieza | LC5200 | |
| Descripción | LED Drivers | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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LC5200 Series
LED Drivers
Features and Benefits
▪ Supply voltage, VBB, 450 V maximum,
25 to 400 V recommended; Note: lowest voltage can vary
depending on LED loads
▪ Output current IO(max) options:
▫ 0.5 A, LC5205D
▫ 1.0 A, LC5210D
▪ Constant current control circuit:
▫ Fixed off-time PWM constant current control, off-time
adjustable by external components
▫ Externally adjustable output current by input voltage
to REF pin
▪ Output current dimming by external PWM signal; low
signal to TOFF pin shuts off output current, and PWM
signal input to that pin enables dimming
▪ Undervoltage lockout protection (UVLO)
▪ Overcurrent protection (OCP); latched in response to the
short-to-GND condition
▪ Thermal Shutdown protection (TSD); protects IC from
damage due to excess temperature, auto-restart when
temperature drops below threshold
Package: 7-pin DIP
Description
LC5200 series is an off-line LED driver IC which includes
both a main controller integrated circuit (MIC) and a
power MOSFET. Its high voltage capability allows direct
connection to a wide range of supply voltages ranging from
25 to 400 V (recommended). The LC5200 uses constant
current mode to drive LEDs. The package is a standard
8-pin DIP, with pin 7 removed for greater creepage distance
from the supply pin.
www.DataSheet4U.com
Not to scale
48102.002
Functional Block Diagram
VBB
OUT
MIC
Reg
Regulator
UVLO
TSD
Toff
Current
Logic
Gate
Ref Control
Driver
OCP
GND
Sen
1 page  
LC5200 Series
LED Drivers
Application Information
Typical Application Example
A typical application circuit is shown in figure 1. The values of
the external components are shown in the adjacent table.
Component Value Setting
LED LED current should not exceed the LC5200 device current
ratings. Set the total voltage drop across the LED string to be
less than VBB; otherwise, the LED string turns off. As a general
design rule, the PWM off-time should be longer if there is a small
drop in voltage across the LED string, and it should be shorter
if there is a high drop in voltage across the LED string. For the
LC5205D, a 9 to 30 V drop across the LED string is recom-
mended for proper operation.
Input
Line
Filt er
CO
ROff R1
COff
R2
Reg VBB
Di
Toff LC5200 OUT
Ref GND Sen
C1 RS
LED
L
www.DataSheet4U.com
Figure 1. Typical application circuit
Referenced Typical Application Components
Symbol
C0
Components
Electrolytic capacitor
Values / Ratings
≈100 μF / 450 V
Descriptions
Main supply source voltage rectifying capacitor
Note: ≤ 1 μF can be used
C1
Capacitor
0.1 μF / 25 V The internal regulator output capacitor
COff Capacitor 100 pF / 25 V PWM off-time adjusting capacitor
Di Diode
RL3A
High voltage, ultrafast rectifying, current recirculation diode
L
Coil
1 mH / 1 A
PWMing choke coil
LED LEDs
―――
LED load
R1
Resistor
680 kΩ / 1/8 W Reference pin voltage setup resistor
R2
Resistor
20 kΩ / 1/8 W Reference pin voltage setup resistor
ROff
Resistor
620 kΩ / 1/8 W PWM off-time adjusting resistor
RS
Resistor
1.0 Ω / 1 W
Output current sensing resistor
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
48102.002
5 Page 
LC5200 Series
LED Drivers
WARNING — These devices are designed to be operated at lethal voltages and energy levels. Circuit designs
that embody these components must conform with applicable safety requirements. Precautions must be
taken to prevent accidental contact with power-line potentials. Do not connect grounded test equipment.
The use of an isolation transformer is recommended during circuit development and breadboarding.
Because reliability can be affected adversely by improper storage
environments and handling methods, please observe the following
cautions.
Cautions for Storage
• Ensure that storage conditions comply with the standard
temperature (5°C to 35°C) and the standard relative humidity
(around 40 to 75%); avoid storage locations that experience
extreme changes in temperature or humidity.
• Avoid locations where dust or harmful gases are present and
avoid direct sunlight.
• Reinspect for rust on leads and solderability of products that have
been stored for a long time.
Cautions for Testing and Handling
When tests are carried out during inspection testing and other
standard test periods, protect the products from power surges
from the testing device, shorts between adjacent products, and
shorts to the heatsink.
Remarks About Using Silicone Grease with a Heatsink
• When silicone grease is used in mounting this product on a
heatsink, it shall be applied evenly and thinly. If more silicone
grease than required is applied, it may produce stress.
• Coat the back surface of the product and both surfaces of the
www.DinastauSlahtienegt4pUla.tceotmo improve heat transfer between the product and
the heatsink.
• Volatile-type silicone greases may permeate the product and
produce cracks after long periods of time, resulting in reduced
heat radiation effect, and possibly shortening the lifetime of the
product.
• Our recommended silicone greases for heat radiation purposes,
which will not cause any adverse effect on the product life, are
indicated below:
Type
Suppliers
G746
Shin-Etsu Chemical Co., Ltd.
YG6260
Momentive Performance Materials
SC102
Dow Corning Toray Silicone Co., Ltd.
Heatsink Mounting Method
• Torque When Tightening Mounting Screws. Thermal resistance
increases when tightening torque is low, and radiation effects are
decreased. When the torque is too high, the screw can strip, the
heatsink can be deformed, and distortion can arise in the product frame.
To avoid these problems, observe the recommended tightening torques
for this product package type, TO-3P (MT-100): 0.686 to 0.882 N•m (7
to 9 kgf•cm).
• Diameter of Heatsink Hole: < 4 mm. The deflection of the press mold
when making the hole may cause the case material to crack at the joint
with the heatsink. Please pay special attention for this effect.
Soldering
• When soldering the products, please be sure to minimize the
working time, within the following limits:
260±5°C 10 s
350±5°C 3 s
• Soldering iron should be at a distance of at least 1.5 mm from the
body of the products
Electrostatic Discharge
• When handling the products, operator must be grounded.
Grounded wrist straps worn should have at least 1 MΩ of
resistance to ground to prevent shock hazard.
• Workbenches where the products are handled should be
grounded and be provided with conductive table and floor mats.
• When using measuring equipment such as a curve tracer, the
equipment should be grounded.
• When soldering the products, the head of soldering irons or the
solder bath must be grounded in other to prevent leak voltages
generated by them from being applied to the products.
• The products should always be stored and transported in our
shipping containers or conductive containers, or be wrapped in
aluminum foil.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
48102.002
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LC5200.PDF ] | |
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