6 Channel LED Backlight Driver with Power Supply

MC34845

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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.

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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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