汽車應用L9960集成H橋解決方案詳解

ST公司的L9960是用于汽車電子節流控制激勵器（ETC）或廢氣再循環控制閥（（EGR）的電阻或電感負載的集成H橋，包括飛輪二極管。在飛輪狀態條件，只有并行二極管的低邊才開關，從而降低功耗，其集成的串行外設接口（SPI）可調整器件參數，從而控制所有工作模式和讀出診斷信息。滿足汽車AEC-Q100規范，電池工作電壓4.5 V到28 V，VDD5工作電壓4.5 V到5.5 V，輸入開關頻率高達20kHz.本文介紹了L9960主要特性，框圖和應用框圖，以及評估板EVAL-L9960/L9960T主要特性，電路圖和PCB設計圖。

The device is an integrated H-Bridge for resistiveand inductive loads for automotive applications，such as throttle control actuators or exhaust gasrecirculation control valves.The driving strategy is enhanced by configurablePWM / DIR pins and IN1/IN2.

The H-Bridge contains integrated free-wheeldiodes. In case of freewheeling condition， thelow-side only is switched on in parallel of its diodeto reduce power dissipation.

The integrated Serial Peripheral Interface （SPI）makes it possible to adjust device parameters， tocontrol all operating modes and read outdiagnostic information.

L9960主要特性：

AEC-Q100 qualified

?Flexible driving strategy via configurable pinsPWM/DIR （IN1/IN2）

?RDSon《 400 mΩ （full path at Tj =150℃ ）

?Operating battery supply voltage from 4.5 V upto 28 V

Operating VDD5 supply voltage from 4.5 V to5.5 V

?Input switching frequency up to 20 kHz

Built in charge pump supporting 100% dutycycle

?Logic levels compatible to 3.3 V and 5 V

?Monitoring of VDD5 supply voltage withbidirectional switch-off pin

?Current limitation SPI-adjustable in four steps.

?Output stage current limitation withdependence on temperature

?2 Programmable voltage and current slew ratecontrol

?Short circuit and programmable thermalwarning and shutdown thresholds

?Open Load diagnosis in ON condition

?All I/O pins can withstand up to 19 V

?SPI interface for configuration and diagnosis

Two independent enable/disable pins NDISand DIS and SOPC （Switch-off Path Check）available

Spread Spectrum function for EMI reduction

Available in single （L9960） and Twin （L9960T）option， both in PSSO36 package

汽車應用L9960集成H橋解決方案詳解

圖1. L9960框圖

汽車應用L9960集成H橋解決方案詳解

圖2. L9960詳細框圖

汽車應用L9960集成H橋解決方案詳解

圖3. L9960應用框圖

汽車應用L9960集成H橋解決方案詳解

圖4. L9960應用電路（案例）

汽車應用L9960集成H橋解決方案詳解

圖5. L9960菊花鏈應用案例

評估板EVAL-L9960/L9960T

The EVAL-L9960 and EVAL-L9960T are evaluation boards designed to provide the user a platform for the L9960 and L9960T， that are integrated H-Bridge （Twin for L9960T） for resistive and inductive loads for automotive applications， such as throttle control actuators or exhaust gas recirculation control valves.

The board offers all the main input/output capabilities needed to drive a DC motor properly and to provide diagnostic functionalities.Full diagnostic is available through SPI. By using SPI communication， it is possible to program L9960 and L9960T while the application is running （e.i. set the current limitation）.A dedicated pin array allows connecting easily a SPC5 discovery+ board and the EVAL-L9960/L9960T. In association with the discovery board SPC560P-DISP a dedicated SW allows controlling a motor control application by using a PC via a USB port.

The device is an integrated H-Bridge for resistive and inductive loads for automotive applications， such as throttle control actuators or exhaust gas recirculation control valves.

The driving strategy is enhanced by configurable PWM / DIR pins as IN1/IN2.The H-Bridge contains integrated free-wheel diodes. In case of freewheeling conditions， the low side or the high side transistor is switched on in parallel of its diode to reduce power dissipation.

The integrated Serial Peripheral Interface （SPI） allows device parameters adjustment and to control all operating modes and read out diagnostic information.Detailed failure diagnostics on each channel is provided via SPI： short circuit to battery， short circuit to ground， short circuit overload， over temperature. Open-load can be detected in ON condition， for the widest application ranges.

The EVAL-L9960 and EVAL-L9960T boards are suitable for both beginners and expert users working in standalone mode connected with any control system or combined with all SPC5 Discovery+ boards through a computer graphic interface or though embedded application examples.

The board is compatible with both 5V and 3.3V control systems

The EVAL-L9960/L9960T is an evaluation board designed to allow the whole hardware configuration flexibility， giving the user total access to all pins of the L9960/L9960T.