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reference designLT8356-1

Analog Devices LT8356-1

100VIN/120VOUT LED Controller with Exponential PWM and Scalable Dimming

Overview

TopologyBoost Converter
Input voltage6-40 V
Switching frequency100-2000 kHz

Description

The LT®8356-1 is a DC/DC controller designed to drivehigh current LEDs. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A voltage feedback pin serves as the input for several LED protection features and makes it possible for the converter to operate as a constant-voltage source. The LT8356-1 can implement boost, boost-to-battery, buck-mode, SEPIC, and flyback LED drivers.The LT8356-1 senses output current at the high or low side of the load. The product of CTRL and IADJ inputs provides analog programming of the output current. 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%.

Features

  • 128:1 Internal Exponential PWM Dimming
  • Two-Pin Multiplying Analog Dimming
  • Internal 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 100V)
  • PMOS Switch Driver for PWM and OutputDisconnect
  • Constant-Voltage and Constant-Current Regulation
  • Adjustable Switching Frequency Up to 2MHz
  • Programmable VIN UVLO with Hysteresis
  • Side Solderable 20-Lead 3mm × 4mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications

Typical applications

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

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
SamplesAvailability & Sample
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74435574700
SPECWE-HCI SMT Flat Wire High Current Inductor, 47 µH, 6.4 A

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance47 µH
Performance Rated Current6.4 A
Saturation Current @ 10%6.25 A
Saturation Current @ 30%7 A
DC Resistance33.5 mΩ
Self Resonant Frequency7.5 MHz
MaterialMnZn 
Packaging Unit150 
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