Diodes Incorporated

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55V Three-Channel PWM Linear LED Driver

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The AL1783Q is an automotive grade three-channel PWM linear LED driver with independent PWM dimming and current setting controls for each channel. The device is designed to target automotive LED lighting applications.

The key merits of the AL1783Q are attributed to a compact solution, eBOM cost effectiveness, excellent PWM dimming performance, low standby power, ease of system implementation, and up to 55V input and LED pin operating voltage.

The AL1783Q is available in the TSSOP-16EP package to minimize PCB space and external component count.


  • AEC-Q100 (Grade 1) Qualified
  • Wide Input-Voltage Range from 6.5V to 55V
  • -40°C to +125°C Ambient Temperature Operation Range
  • ±4% LED Current Tolerance @125mA
  • Independent PWM Dimming Control for Each Channel
  • Three External Ref Pins to Set LED Current for Each Channel
  • Enter and Exit Standby Power-Saving Mode Automatically
  • Support Fast 40kHz PWM Dimming
  • Robust Protections: Undervoltage Lockout (UVLO), Overvoltage Protection (OVP), LED String Open Protection (LED Open)
  • Overtemperature Protection (OTP): Thermal Foldback, Thermal Shutdown, and Automatic Thermal Recovery
  • Fault Reporting: UVLO, OTP, LED Open and Short
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AL1783Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • Daytime running lights
  • Position lights
  • Fog lights
  • Rear lights
  • Stop or taillights
  • Interior lighting

Product Specifications

Product Parameters

AEC Qualified Yes
Compliance (Only Automotive supports PPAP) Automotive
Topology Linear LED Driver
Minimum Supply Voltage (V) 6.5 V
Maximum Supply Voltage (V) 55 V
Maximum VOUT (V) 55 V
Number of Channels 3
LED Current Sense Voltage (mV) NA mV
Output Current (mA) 250 mA
Channel Max. Output Current (mA) 250 mA
Accuracy (%) 4 %
Dimming independent PWM
Temperature Range (°C) -40 to 125 °C

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