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PDF IS32LT3953 Data sheet ( Hoja de datos )
| Número de pieza | IS32LT3953 | |
| Descripción | CONSTANT-CURRENT 3-AMPERE PWM DIMMABLE BUCK REGULATOR LED DRIVER | |
| Fabricantes | ISSI | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IS32LT3953 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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IS32LT3953
CONSTANT-CURRENT 3-AMPERE PWM DIMMABLE
BUCK REGULATOR LED DRIVER
Advanced Information
December 2013
GENERAL DESCRIPTION
The IS32LT3953 is a DC-to-DC switching converter
with an integrated N-channel MOSFET operating in a
buck configuration. The device is connected to a
voltage higher than the LED voltage; between 6V and
48V and provides a constant current of up to 3.0A for
driving a single LED or multiple series connected
LEDs.
The LED output current is set by an external current
sense resistor, allowing the output voltage to be
automatically adjusted for a variety of LED
configurations.
The IS32LT3953 operates in a fixed frequency mode
during switching. The on-time (switching frequency) is
programmed using an external resistor connected
between the VIN and TON pins.
LED dimming is accomplished by applying a logic
input PWM (pulse-width-modulation) signal to the
enable (EN) pin. The resulting LED brightness is
proportional to the duty cycle of the PWM signal.
True average current is output using cycle-by-cycle,
controlled on-time method.
The IS32LT3953 is offered in an SOP-8-EP package
with an exposed pad for enhanced thermal dissipation.
The operating temperature range is from -40°C to
+125°C.
FEATURES
Supply voltage 6V ~ 48V
True average output current control
3.0A maximum output over operating temperature
range
Cycle-by-cycle current limit
Integrated MOSFET switch
Dimming via direct logic input or power supply
voltage
Internal control loop compensation
Under-voltage lockout (UVLO) and thermal
shutdown protection
Low power shutdown (1μA typical)
Robust protection against:
-Adjacent pin-to-pin short
-Pin-to-GND short
-Component open/short faults
Automotive AEC-Q100 Qualified (Pending)
APPLICATIONS
Automotive and avionic lighting
Daytime running lights
Front and rear fog lights
Turn/stop lights
Map light
Dimmable interior lights
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 00A, 11/29/2013
1
1 page  
IS32LT3953
ELECTRICAL CHARACTERISTICS (CONTINUE)
VIN = 24V, TA = -40⁰C ~ +125⁰C, Typical values are at TA = 25°C
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
Enable Input
VIH
VIL
RPWMPD
Logic high voltage
Logic low voltage
EN pin pull-down resistance
tPWML Maximum PWM dimming off-time
VPWM increasing
1.8
V
VPWM decreasing
0.4 V
VPWM = 5V
100
Measured while PWM =
low, during dimming control,
and internal references are 10 17
powered-on (exceeding
tPWML results in shutdown)
kΩ
ms
Thermal Shutdown
TSD Thermal shutdown threshold
TSDHYS Thermal shutdown hysteresis
Note 1: The internal linear regulator is not designed to drive an external load.
165 °C
25 °C
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 00A, 11/29/2013
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet IS32LT3953.PDF ] | |
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