Subject: Freescale Semiconductor, a technology-based manufacturer, has introduced the MC34845 LED driver with high-speed pulse modulation (PWM). This six-channel device allows the LCD backlight to operate at frequencies outside the audio range, eliminating noise and smear. The MC34845 LED driver is ideally suited for 7-17 British households, as well as other applications that use multiple low-power LEDs (such as lighting products).
Michael Jennings, director of display product marketing for Freescale's analog mixed-signal and power management division, said the MC34845 driver helps manufacturers avoid the many problems that LED drivers can experience at lower frequencies. Advanced technologies such as the MC34845 will help drive LED backlighting in the global notebook market.
The high speed LED driver supports PWM up to 100kHz and pulse widths down to 200ns. This feature is suitable for a 1000:1 dimming range at the 25 kHz frequency level and provides excellent linearity in this range, supporting very fine dimming initiatives. The driver is also very accurate, supporting ±2% of maximum current matching over the -40 to +85° operating temperature, which helps to improve display consistency. It uses a single direct drive PWM input to drive the output.
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The MC34845 uses a boost converter to generate the required voltage to power the LED. Both versions can be used for the boost switching frequency of 600Khz (MC34845) or 1.2MHz (MC34845A). The input range supports 2 and 3 sections of battery or fixed input power. The high-voltage output capability allows the device to drive 96 white LEDs with more drives than the competing 6-channel design. The dynamic margin control automatically sets the output voltage according to the voltage requirements of the LED.
The MC34845 supports low-power shutdowns with a maximum supply current of only 1uA. In addition, with the automatic shutdown mode, the device shuts down after the PWM input is inactive for a certain period of time.
Michael Jennings, director of display product marketing for Freescale's analog mixed-signal and power management division, said the MC34845 driver helps manufacturers avoid the many problems that LED drivers can experience at lower frequencies. Advanced technologies such as the MC34845 will help drive LED backlighting in the global notebook market.
The high speed LED driver supports PWM up to 100kHz and pulse widths down to 200ns. This feature is suitable for a 1000:1 dimming range at the 25 kHz frequency level and provides excellent linearity in this range, supporting very fine dimming initiatives. The driver is also very accurate, supporting ±2% of maximum current matching over the -40 to +85° operating temperature, which helps to improve display consistency. It uses a single direct drive PWM input to drive the output.
The MC34845 uses a boost converter to generate the required voltage to power the LED. Both versions can be used for the boost switching frequency of 600Khz (MC34845) or 1.2MHz (MC34845A). The input range supports 2 and 3 sections of battery or fixed input power. The high-voltage output capability allows the device to drive 96 white LEDs with more drives than the competing 6-channel design. The dynamic margin control automatically sets the output voltage according to the voltage requirements of the LED.
The MC34845 supports low-power shutdowns with a maximum supply current of only 1uA. In addition, with the automatic shutdown mode, the device shuts down after the PWM input is inactive for a certain period of time.
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