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Taiwan Semiconductor TSCR420 & TSCR421 Constant Current Regulators

Taiwan Semiconductor TSCR420 and TSCR421 Low-Side Constant Current Regulators (CCR) are designed to reduce current temperatures in linear LED strings. CCRs vary the voltage across a load to maintain a constant electric current. The devices regulate with a preset 10mA nominal that can be adjusted with an external resistor up to 300mA. The regulators can be used in multiple applications if the maximum supply voltage to the device is less than 40V. Taiwan Semiconductor TSCR421 has an enable (EN) pin that can be pulse-width modulated (PWM) up to 10kHz by a microcontroller for LED dimming while in low-side control.

Features

  • AEC-Q100 qualified with the following results:
    • -40°C to +125°C device temperature grade 1
    • Device HBM ESD classification level H2
    • Device CDM ESD classification level C6
  • LED drive current preset to 10mA
  • Up to 300mA continuous output current with an external resistor
  • Very low enable current
  • Easy paralleling of drivers to increase current
  • Up to 40V supply voltage
  • Up to 10kHz Digital PWM input (TSCR421)
  • Good temperature coefficient versus output current
  • Compliant to RoHS Directive 2011/65/EU and in accordance with WEEE 2002/96/EC.
  • Halogen-free, according to IEC 61249-2-21

Applications

  • Automotive lighting
  • Architectural LED lighting, emergency lighting
  • Signage, advertising, decorative lighting
  • Retail lighting in refrigerators and vending machines

Application Circuit Diagram

Application Circuit Diagram - Taiwan Semiconductor TSCR420 & TSCR421 Constant Current Regulators

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Publicado: 2019-03-25 | Actualizado: 2023-06-23