6 Channel LED Backlight Driver with Power Supply

MC34845
  • Archived
  • This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.

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The NXP® MC34845 is a high efficiency, LED driver for use in backlighting LCD displays from 10” to 17”+.

  • Capable of driving up to 16 LEDs in series in each of 6 strings
  • PWM dimming is performed by applying a PWM input signal to the PWM pin which modulates the LED channels directly
  • The integrated boost converter uses dynamic headroom control to automatically set the output voltage
  • Three device versions for boost frequency: the 34845 and 34845C are 600 kHz, the 34845 A is 1.2 MHz and the 34845B and 34845D are 300 kHz
  • Includes fault protection modes for LED short and open, over temperature, over current and over voltage errors. The OVP level can be set by using an external resistor divider.

Product Details

Block Diagram

Freescale MC34845 LED Driver Block Diagram

NXP<sup>&#174;</sup> MC34845 LED Driver Block Diagram
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Features

Key Features

  • Input voltage of 5 to 21 V
  • Boost output voltage up to 60 V
  • Output current 2.1, 2.35 A
  • 2.0 A integrated boost FET
  • Fixed boost frequency to 300 kHz, 600 kHz or 1.2 MHz
  • OTP, OCP, UVLO fault detection, LED short/open protection
  • Programmable LED current between 3.0 mA and 30 mA
  • 24-Ld 4x4x0.65 mm WQFN Package
  • Parallel interface and input control

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