Datasheet Linear Technology LT1932 — Ficha de datos

Fabricante	Linear Technology
Serie	LT1932

Controlador LED de CC / CC de corriente constante en ThinSOT

Hojas de datos

PDF, 252 Kb, Archivo subido: oct 4, 2017

Extracto del documento

Embalaje

	LT1932ES6#PBF	LT1932ES6#TRMPBF	LT1932ES6#TRPBF
N	1	2	3
Package	SOT-23 Dibujo del esquema del paquete	SOT-23 Dibujo del esquema del paquete	SOT-23 Dibujo del esquema del paquete
Package Code	S6	S6	S6
Package Index	05-08-1636	05-08-1636	05-08-1636
Pin Count	6	6	6

Paramétricos

Parameters / Models	LT1932ES6#PBF	LT1932ES6#TRMPBF	LT1932ES6#TRPBF
Architecture	Average Output Current Control	Average Output Current Control	Average Output Current Control
Design Tools	LTspice File	LTspice File	LTspice File
Dimming	PWM, Analog	PWM, Analog	PWM, Analog
Export Control	no	no	no
Features	Output Disconnect	Output Disconnect	Output Disconnect
Frequency, kHz	1200	1200	1200
Ishutdown, µA	1	1	1
Isupply, mA	1.2	1.2	1.2
Max Number of LEDs	8	8	8
Monolithic	yes	yes	yes
Number of Outputs	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85
Switch Current, A	0.55	0.55	0.55
Synchronous	no	no	no
Topology	Boost, LED Driver	Boost, LED Driver	Boost, LED Driver
Vin Max, V	10	10	10
Vin Min, V	1	1	1
Vout Max, V	36	36	36

Plan ecológico

	LT1932ES6#PBF	LT1932ES6#TRMPBF	LT1932ES6#TRPBF
RoHS	Obediente	Obediente	Obediente

Notas de Diseño

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High Efficiency White LED Driver Guarantees Matching LED Brightness &mdash DN267
PDF, 80 Kb, Archivo publicado: sept 2, 2001
Extracto del documento
High Efficiency White LED Driver Guarantees Matching LED
Brightness вЂ“ Design Note 267
Dave Kim
Introduction
White LEDs are widely used in small LCD backlight
applications for simplicity, high reliability and low cost.
However, due to variations in the forward voltage drop of
white LEDs, matching the brightness becomes a major
design consideration for multiple LED applications.
Since LED brightness is proportional to current rather
than voltage, a constant-current source driving LEDs in
series should be used to ensure the same illumination
of each LED. The LTВ®1932 uses a constant-current stepup architecture that directly regulates the LED current
and guarantees a constant light intensity in each LED,
regardless of differences in their forward voltage drops.
Its unique internal current source accurately regulates
LED current even when the input voltage is higher than
the LED voltage, greatly simplifying the battery/adapter
power designs. The internal 36V switch is capable of
driving up to eight LEDs in series with 20mA of LED
current. Li-Ion LED Driver for Four White LEDs
The white LED driver shown in Figure 1 is an ideal solution for Li-Ion powered, 4-LED backlight applications.
The LT1932 and п¬Ѓve external components require less …

Artículos

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Constant-Current DC/DC Converter Drives White LEDs with 80% Efficiency &mdash LT Journal
PDF, 140 Kb, Archivo publicado: mayo 1, 2001
Extracto del documento
DESIGN FEATURES Constant-Current DC/DC Converter
Drives White LEDs with 80% Efficiency
by Bryan Legates
Introduction
flow in the LEDs, leading to brightness
mismatch. Typical efficiencies of 75%
to 80% are obtained using the LT1932,
significantly higher than the 40% to
50% efficiencies obtained in paralleldriven charge-pump solutions.
A single external resistor sets the
LED current between 5mA and 40mA,
which can then be easily adjusted to
provide dimming using either a DC
voltage or a pulse-width-modulated
(PWM) signal. With an input voltage
range of 1V to 10V, the LT1932 works
from a variety of input sources; it can
even regulate the LED current when
the input voltage is higher than the The new LT1932 DC/DC converter is
specifically designed to provide high
efficiency, constant-current drive for
white LED backlights. To achieve the
best possible brightness matching, …

Linea modelo

Serie: LT1932 (3)

LT1932ES6#PBF LT1932ES6#TRMPBF LT1932ES6#TRPBF

Clasificación del fabricante

Power Management > LED Driver ICs > Step-Up (Boost) LED Drivers

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