ST L99DZ70XP汽车门驱动方案

ST 公司的L99DZ70XP是微控制器驱动的多功能汽车门激励驱动器,适合于汽车电子应用. L99DZ70XP有六个半桥和五个高边驱动器,能驱动5个DC马达和5个接地的电阻负载.全桥能对负载提供6A的能力,并具有可编程的软起动功能.所有输出采用PWM控制.本文介绍了L99DZ70XP的主要特性, 应用方框图和Electrochrome鏡子控制方框图.

The L99DZ70XP is a microcontroller driven multifunctional door actuator driver for automotive applications. Up to five DC motors and five grounded resistive loads can be driven with six half bridges and five highside drivers. An electrochromic mirror glass can be controlled using the integrated SPI-driven module in conjunction with an external MOS transistor. The integrated SPI controls all operating modes (forward, reverse, brake and high impedance). Also all diagnostic information is available via SPI read.

L99DZ70XP主要特性:
■One full bridge for 6A load (Ron= 150mΩ )
■Two half bridges for 3A load (Ron= 300mΩ )
■Two half bridges for 0.75A load (Ron=1600mΩ )
■One highside driver for 6A load (Ron= 90mΩ )
■Two configurable highside drivers for up to 1.5A load (Ron=500mΩ) or 0.4A (Ron=1800mΩ)
■Two highside drivers for 0.5A load (Ron= 1600mΩ )
■Programmable soft-start function to drive loads with higher inrush currents as current limitation value
■Very low current consumption in standby mode (IS < 6μA typ;Tj ≤ 85°C, ICC < 5μA typ; Tj ≤ 85 °C)
■Current monitor output for all highside drivers
■Device contains temperature warning and protection
■Openload detection for all outputs
■Over-current protection for all otputs
■Separated half bridges for door lock motor
■PWM control of all outputs
■Charge pump output for reverse polarity protection
■STM standard serial peripheral interface (ST-SPI 3.0)
■Control block for Electrochromic element
L99DZ70XP应用:
Door actuator driver with 6 bridges for double door lock control, mirror fold and mirror axis
control, highside driver for mirror defroster, bulbs and LEDs (replacement for L9950). Control block with external MOS transistor for charging / discharging of electrochromic glass.




图1. L99DZ70XP应用方框图



图2.L99DZ70XP Electrochrome鏡子控制方框图