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

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.

特性
  • Adaptive Feedback Control to External SMPS for Better Efficiency
  • PWM and Analog Mode Dimming
  • Open Cathode-Anode (OCA) Fault Protection
  • 6 Channel LED Controller
  • Short Cathode-Anode (SCA) Fault Protection
  • Over-Voltage Protection
  • Thermal Shutdown Protection
  • Automatic Inactivity Power Down Mode
优势
  • Enhanced power efficiency of the external SMPS
  • Extended range of dimming control
  • Robustness in case of LED disconnect or large LED string voltage mismatch
应用
  • LED Backlighting
终端产品
  • LCD TVs
应用注释 (2)
Document TitleDocument ID/SizeRevisionRevision Date
HB-LLC LED Driver BoardAND8479/D (1816.0kB)0
NCP1252 Boost and CAT4026 LED Driver BoardAND8478/D (2237.0kB)0
封装图纸 (1)
Document TitleDocument ID/SizeRevision
SOIC-28, 300 mils751BM (57.6kB)revo
数据表 (1)
Document TitleDocument ID/SizeRevisionRevision Date
LED Controller, 6-Channel, with Fault DiagnosticsCAT4026/D (324.0kB)5
产品订购型号
产品状况Compliance封装MSL*容器预算价格 (1千个数量的单价)
CAT4026V-T1ActivePb-free Halide freeSOIC-28W751BM3Tape and Reel1000联系BDTIC
订购产品技术参数
ProductVI Max (V)IO Max (mA)LEDs in Series, Max #LEDs in Parallel, Max #
CAT4026V-T15.5-806
LED Controller, 6-Channel, with Fault Diagnostics (324.0kB) CAT4026
HB-LLC LED Driver Board CAT4026
NCP1252 Boost and CAT4026 LED Driver Board NCP1252
SOIC-28, 300 mils CAT4026
CAT4026