CAT4026: LED Controller, 6-Channel, with Fault Diagnostics

Datasheet: LED Controller, 6-Channel, with Fault Diagnostics
Rev. 5 (324.0kB)
Product Overview
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The CAT4026 is a high performance, large panel LED controller designed to control six constant current high voltage LED strings. Added control circuitry monitors the lowest cathode voltage and generates a feedback control signal to an external Switch Mode Power Supply (SMPS) to provide a low cost and efficient solution for large panel high voltage LED backlighting.

Each LED channel current is accurately matched and controlled by sensing an external resistor in series with a low cost bipolar power transistor. This allows current and heat dissipation concerns to be mitigated from the CAT4026 device package.

For added system reliability, both Open-Cathode-Anode (OCA) and Shorted-Cathode-Anode (SCA) fault detection circuitry has been included along with independent Fault flag logic outputs for diagnostic purposes.

LED current dimming in all six channels can be precisely controlled by either a Pulse Width Modulation signal via the PWM input pin or by an analog dimming voltage applied at the ANLG pin. In addition the ANLG pin provides a convenient method for limiting the overall maximum power dissipation in the event of excessive LED shorting within any LED string.

The device will automatically enter low current shutdown mode by taking the PWM pin low for an extended length of time.
Features   Benefits
  • Adaptive Feedback Control to External SMPS for Better Efficiency
  • Enhanced power efficiency of the external SMPS
  • PWM and Analog Mode Dimming
  • Extended range of dimming control
  • Open Cathode-Anode (OCA) Fault Protection
  • Robustness in case of LED disconnect or large LED string voltage mismatch
  • 6 Channel LED Controller
  • Short Cathode-Anode (SCA) Fault Protection
  • Over-Voltage Protection
  • Thermal Shutdown Protection
  • Automatic Inactivity Power Down Mode
Applications   End Products
  • LED Backlighting
  • LCD TVs
Technical Documentation & Design Resources
Application Notes (2) Package Drawings (1)
Data Sheets (1) FAQ (1)
Budgetary Price/Unit
Case Outline
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PandS   (2020-09-14 00:00) : <1K
Case Outlines
CAT4026: LED Controller, 6-Channel, with Fault Diagnostics
CAT4026: LED Controller, 6-Channel, with Fault Diagnostics
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  • Constant current output for LED string drive
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  • Multiple LED string control with one controller

NCV7683  8-Channel Linear Current Driver for Automotive LED Lighting

  • Eight current sources with global current setting up to 100 mA and diagnostics
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