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ReferenzdesignLT8355-1

Analog Devices LT8355-1

60VIN/120VOUT Dual LED Controller with Exponential PWM and Scalable Dimming

Details

TopologieAbwärtswandler
Eingangsspannung36-54 V
Schaltfrequenz100-2000 kHz
Ausgang 1120 V

Beschreibung

The LT®8355-1 a dual-channel DC/DC controller designed to drive two strings of high current LEDs. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. Voltage feedback pins serve as the inputs for several LED protection features and makes it possible for the converters to operate as a constant-voltage sources.The LT8355-1 senses output current at the high or low side of the load. The product of CTRL2 and IADJ2 inputs provides analog programming of the output current for channel 2. Channel 1 output current is programmed through CTRL1 input. The PWM input and PWMTG high side PMOS driver provides precision time-based LED dimming capability. When driven by an external digital signal, the PWM input provides LED dimming ratios of up to 20,000:1 at 100Hz. When driven by a constant voltage, the PWM input selects from one of 128 internally generated, precision, exponentially spaced dimming ratios ranging from 0.78% up to 100%.

Eigenschaften

  • Two independent High Voltage LED DriverControllers Channels
  • 128:1 Internal Exponential PWM Dimming
  • Two-Pin Multiplying Analog Dimming (CH2)
  • Spread Spectrum Frequency Modulation
  • 20,000:1 External PWM Dimming at 100Hz
  • Rail-to-Rail LED Current Sensing: 0V to 120V
  • ±2% LED Current Regulation
  • ±2% Output Voltage Regulation
  • LED Short/Open Protection and Indication
  • Wide Input Voltage Range (5V to 60V)
  • PMOS Switch Driver for PWM and Output Disconnect
  • Independent Channel Dimming
  • Constant-Voltage and Constant-Current Regulation
  • Adjustable Switching Frequency 100kHz to 2MHz
  • Independent OPEN/SHORT LED FAULT per channel
  • Programmable VIN UVLO with Hysteresis
  • Side Solderable 28-Lead 4mm × 5mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications

Typische Anwendungen

  • Automotive Head Lamps/Running Lamps, Accurate Current Limited Voltage Regulator
  • High Voltage LED Applications

Weiterführende Informationen

Artikeldaten

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Artikel Nr.
Daten­blatt
Simu­lation
Downloads
Status
Produktserie
L(µH)
IRP,40K(A)
RDC max.(mΩ)
fres(MHz)
Bauform
Version
MusterVerfügbarkeit & Muster
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7447789133
SPECWE-PD SMT-Speicherdrossel, 33 µH, 1.85 A
Simu­lation
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Downloads9 Dateien

Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre.
ProduktserieWE-PD SMT-Speicherdrossel
Induktivität33 µH
Performance Nennstrom1.85 A
Gleichstromwiderstand240 mΩ
Eigenresonanzfrequenz16 MHz
Bauform7332 
VersionRobust 
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