ST's L9960 is an integrated H-bridge for automotive electronic throttle control actuators (ETC) or exhaust gas recirculation control valves (EGR) for resistive or inductive loads, including flywheel diodes. In flywheel state conditions, only parallel diodes The low-side switch only reduces power consumption, and its integrated serial peripheral interface (SPI) adjusts device parameters to control all operating modes and read out diagnostic information.Satisfy automotive AEC-Q100 specification, battery operating voltage is 4.5 V to 28 V, VDD5 operating voltage 4.5 V to 5.5 V, input switching frequency up to 20 kHz. This article describes the L9960 main features, block diagrams and application block diagrams, as well as evaluation board EVAL-L9960/L9960T main features, circuit diagrams and PCB design drawings.
The device is an integrated H-Bridge for resisTIveand inducTIves for automoTIve applications, such as throttle control actuators or exhaust gas recirculation control valves. The driving strategy is enhanced by configurablePWM/DIR pins and IN1/IN2.
The H-Bridge contains integrated free-wheel diodes. In case of freewheeling condition, the low-side only switched on in parallel of its diode to reduce power dissipation.
The Integrated Serial Peripheral Interface (SPI) makes it possible to adjust device parameters, tocontrol all operating modes and read out diagnostic information.
L9960 main features:AEC-Q100 qualified AEC-Q100 qualified
Flexible driving strategy via configurable pinsPWM/DIR (IN1/IN2)
RDSon 400 mΩ (full path at Tj =150°C)
Operating battery supply voltage from 4.5 V upto 28 V
Operating VDD5 supply voltage from 4.5 V to 5.5 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 selectively thermal warning 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
Figure 1. L9960 block diagram
Figure 2. Detailed block diagram of L9960
Figure 3. L9960 application block diagram
Figure 4. L9960 Application Circuit (Case)
Figure 5. L9960 Daisy Chain Application Case
Evaluation Board EVAL-L9960/L9960TThe 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 amplifier 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 (ei 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 inductives 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 even 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.
Evaluation Board EVAL-L9960/L9960T main features:Total accessibility to all devices pins
Full HW compatibility with the SPC56 discovery boards through the standard SPC56 Discovery+ connector, 0.1†- 4x36 pin.
Possibility to connect generic microcontroller boards (a) by using a customised adapter
Figure 6. Application diagram
Figure 7. EVAL-L9960 outline drawing
Figure 8. EVAL-L9960T outline drawing
Figure 9. EVAL-L9960T and EVAL-L9960 Circuit Diagrams
Figure 10. SPC56 Discovery+ Connector Circuit Diagram
Figure 11. Motor A Connector
Figure 12. Motor B Connector
Figure 13. L9960T SPI Configuration
Figure 14. PCB layout diagram for EVAL-L9960T and EVAL-L9960 (top level)
Figure 15. PCB layout diagram for the EVAL-L9960T and EVAL-L9960 gate driver board (bottom layer)
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