Linear Technology part of Analog Devices

LT3492

Triple Output LED Driver with 3000:1 PWM Dimming

Topologie: Buck-Boost
Eingangsspannung (min.): 3.00 V
Eingangsspannung (max.): 30.00 V
Schaltfrequenz (min.): 330.00 kHz
Schaltfrequenz (max.): 2100.00 kHz

Erstveröffentlichung am 01.04.2010, Version A

Beschreibung

The LT®3492 is a triple output DC/DC converter designed to operate as a constant-current source and is ideal for driving LEDs. The LT3492 works in buck, boost or buckboost mode. The LT3492 uses a fixed frequency, currentmode architecture resulting in stable operation over a wide range of supply and output voltages. A frequency adjust pin allows the user to program switching frequency between 330kHz and 2.1MHz to optimize efficiency andexternal component size.The external PWM input provides 3000:1 LED dimming on each channel. Each of the three channels has a built-in gate driver to drive an external LED-disconnect P-channel MOSFET, allowing high dimming range. The output current range of each channel of the LT3492 is programmed with an external sense resistor.The CTRL pin is used to adjust the LED current either for analog dimming or overtemperature protection.

Merkmale

  • True Color PWM™ Dimming Delivers Up to 3000:1Dimming Ratio
  • Built-In Gate Driver for PMOS LED Disconnect
  • Three Independent Driver Channels with 600mA, 60V Internal Switches
  • Operates in Buck, Boost, Buck-Boost Modes
  • CTRL Pin Accurately Sets LED Current Sense Threshold Over a Range of 10mV to 100mV
  • Adjustable Frequency: 330kHz to 2.1MHz
  • Open LED Protection
  • Wide Input Voltage Range:Operation from 3V to 30VTransient Protection to 40V
  • Surface Mount Components
  • 28-Lead (4mm × 5mm) QFN and TSSOP Packages

Artikel

  Artikel Nr. SPEC Produktserie L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Bauform Version Muster
7447789133 PDF WE-PD SMT-Speicherdrossel 33 1.22 1.15 153 240 16 7332 Robust

Weitere Anwendungen und Artikel von Würth Elektronik zu diesem IC

  • LT3492
    Topologie: Buck-Boost, Eingangsspannung (min.): 10.00 V, Eingangsspannung (max.): 16.00 V, Schaltfrequenz (min.): 330.00 kHz, Schaltfrequenz (max.): 2100.00 kHz, Ausgang 1: V / 0.100 A
  • LT3492
    Topologie: Buck, Eingangsspannung (min.): 3.00 V, Eingangsspannung (max.): 24.00 V, Schaltfrequenz (min.): 330.00 kHz, Schaltfrequenz (max.): 2100.00 kHz, Ausgang 1: V / 0.300 A
  • LT3492
    Topologie: Buck, Eingangsspannung (min.): 5.00 V, Eingangsspannung (max.): 5.00 V, Schaltfrequenz (min.): 330.00 kHz, Schaltfrequenz (max.): 2100.00 kHz, Ausgang 1: V / 0.300 A