LCD back-lighting

LCD back-lighting

Our low VCEsat (BISS) transistors can act as switches in both edge-lit and direct-lit backlight units (BLU). By combining a high-voltage (100 V – 400 V) bipolar BISS transistor with a low voltage MOSFET for LED strings > 100 V, you can realize a switching function with less silicon but the same performance as a high voltage MOSFET.


Key features and benefits

  • High and stable current gain, low turn-on voltage
  • Low saturation voltage
  • Processes with small and efficient (costs and energy) silicon
  • Various small to medium power SMD package options available (SOT23, SOT89, SOT223, SOT1061)

Description

Advantages of low VCEsat (PBSS-series) and high voltage, low VCEsat (PBHV-series) transistors

  • Drive directly from a microcontroller
  • Low on-resistance, high efficiency, high IC capabilities. A MOSFET can always outperform a bipolar but you need more silicon, especially for high voltage applications, and higher gate-source (VBE) voltage for lowest RDSon.
  • Requires significantly less silicon for the same performance in high voltage applications compared to a high-voltage MOSFET

Single switch BLU application using low VCEsat bipolar transistor

For low voltage (< 100 V) LED strings, you can benefit from the advantages of a bipolar transistor by using just a single low VCEsat transistor in a medium-power package (SOT223, SOT89, SOT1061). Make sure that the maximum deviation of the forward voltage (VF) of the LCD string can be covered by the package of your choice.


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