輸出數 2
類型 Boost
電流 - 輸出/通道 (mA) 240mA per channel
電壓 - 電源 4.75-40V
ISD(uA) 10
Intensity Ctrl. PWM
腳位/封裝 eTSSOP-16
狀態 S=NOW
產品系列 32 = 汽車模擬和混合信號
產品類別 BL = LCD背光的白色LED驅動器
IC代碼 3555
焊接 L = 無鉛
温規 A3 = 車規 (-40C to +125°C)
相關IC编號
IS32BL3555-ZLA3-TR

IS32BL3555-ZLA3 特徵

  • Excellent input voltage transient response
  • Sync function to synchronize boost converter switching frequency up to 2.3MHz, allowing operation above the AM band
  • Single resistor primary OVP minimizes VOUT leakage
  • Fully integrated LED current sinks and boost converter up to 55V
  • LED current of 240mA per channel
  • 1% LED to LED matching accuracy
  • Internal secondary OVP for redundant protection
  • Drives up to 12 series LEDs in 2 parallel strings
  • 10000:1 PWM dimming at 100Hz
  • PWM and analog dimming inputs
  • Built-in protection features:
  • - Shorted FSET or ISET resistor - Open or shorted LED - Open boost Schottky - Overtemperature (OTP)
  • AEC-Q100 qualified (pending)
  • LCD Monitor
  • LCD Display Module
  • LCD TV
  • Car infotainment

概觀

The IS32BL3555 is a step-up controller with an integrated switching FET for driving white LED arrays in LCD panel backlight applications. The boost controller is a current mode, fixed frequency architecture with the switching frequency set by an external resistor. The integrated boost controller generates the minimum output voltage to keep all LEDs illuminated at the set current. The current in each of the 2 channels is programmed to a specific value with an external current set resistor and matched to within 1%. LED dimming is achieved using an external digital PWM signal to either adjust the internal ISET current or pulse-width-modulate the LED intensity. The LED sinks have a fast response to a PWM input making it possible to achieve a high contrast ratio of 10,000:1. A synchronization pin can be used to synchronize multiple IS32BL3555 devices or to synchronize with the external PWM source in the range of 580 kHz to 2.3MHz. The high switching frequency allows the IS32BL3555 to operate above the AM radio band. The IS32BL3555 integrates protection features including output overvoltage, open or shorted diode, open or shorted LED pin, shorted FSET or ISET resistor, and IC over temperature. A dual level cycle-by-cycle current limit function provides soft start and protects the internal current switch against high current overloads. The IS32BL3555 is available in a thermally enhanced eTSSOP-16 package.