ST's VNH5019A-E is a full-bridge motor driver that integrates dual high-side drivers and two low-side switches. The three chips are packaged in the MulTIPowerSO-30 package. The leadframe is electrically isolated. Automotive grade products, output current 3A, 3V CMOS compatible input, PWM frequency up to 20kHz, used in a variety of automotive applications. This article describes the main features of VNH5019A, block diagram and application circuit, as well as the main characteristics of the motor drive evaluation board STEVAL-VNH5019A, circuit diagram and bill of materials.
The VHN5019A-E is a full bridge motor driver intended for a wide range of automoTIve applicaTIons. The device incorporates a dual monolithic high-side drivers and two low-side switches. The high-side driver switch is designed using STMicroelectronics' well known and Proper proprietary VIPower® M0 technology that allows to efficiently integrate on the same die a true Power MOSFET with an intelligent signal/protecTIon circuit.
The three channels of assembled in MultiPowerSO-30 package on electrically isolated lead-frames. This package, specifically designed for the harsh automotive environment offers improved thermal performance thanks to exposed die pads. The input signals INA and INB can directly interface to the microcontroller to Select the motor direction and the brake condition.
The DIAGA/ENA or DIAGB/ENB, when connected to an external pull-up resistor, enable one leg of the bridge. They also provide a feedback digital diagnostic signal. The CS pin allows to monitor the motor current by delivering a current proportional to Its value when CS_DIS pin is driven low or left open. The PWM, up to 20 KHz, lets us to control the speed of the motor in all possible conditions. In all cases, a low-level state on the PWM pin turns-off Both the LSA and LSB switches. When PWM rises to a high-level, LSA or LSB turn-on again depending on the input pin state. Output current limitation and thermal shutdown protects the concerned high-side in short to ground condition.
The short to battery condition is revealed by the overload detector or by thermal shutdown that latches off the relevant low-side. Active VCC pin voltage clamp protects the device against low energy spikes in all configurations for the motor.
CP pin provides the necessary gate drive for an external n-channel PowerMOS used for reverse polarity protection.
■ECOPACK®: lead free and RoHS compliant
â– Automotive Grade: compliance with AEC guidelines
â– Output current: 30 A
â– 3 V CMOS compatible inputs
â– Undervoltage and overvoltage shutdown
â– High-side and low-side thermal shutdown
â– Cross-conduction protection
â– Current limitation
â– Very low standby power consumption
â– PWM operation up to 20 khz
â– Protection against:
– Loss of ground and loss of VCC
â– Current sense output proportional to motor current
â– Charge pump output for reverse polarity protection
â– Output protected against short to ground and short to VCC
Figure 1. Block diagram of the VHN5019A
Figure 2. VHN5019A DC-20kHz PWM Application Circuit with Battery Reverse Protection (Option A)
Figure 3. VHN5019A DC-20kHz PWM Application Circuit with Battery Reverse Protection (Select B)
Figure 4. VHN5019A Multiple Motor Drive Configuration Diagram
STEVAL-VNH5019A offers dedicated power stage and controls suitable for electric DC motor driving. This evaluation board comes pre-assembled with VNH5019A H-bridge belonging to the VNH Motor Driver series based on VIPower® proprietary technology. Typical applications are Windows Lift, Sliding Door , Seat regulation.
This Evaluation Board consists of a motherboard (STM8 Universal Board) and a daughterboard.
The motherboard, based on STM8 microcontroller, provides the logic section for monitoring and driving the VNH5019A assembled in the daughterboard.
With the aim to make simpler the board usage and settings, ST provides a dedicated and user-friendly software with a Graphic User Interface (GUI). This enables the user to set VNH5019A parameters (PWM, Motor direction...) and at the same time It shows real time device diagnostic information like current output evolution, battery voltage monitoring, board temperature and much more.
Handling up to 30 A of maximum motor current output
Undervoltage and overvoltage shutdown
Device thermal protection
Cross-conduction protection
Very low standby power consumption
Programmable PWM operation (up to 20 kHz)
Protection against loss of ground and loss of VCC
Motor current monitoring (thanks to VNH5019A current sense output)
On-board charge pump output for reverse polarity protection
Device output protected against short to ground and short to VCC
Graphic User Interface (GUI)
Figure 5. Motor Drive Evaluation Board STEVAL-VNH5019A Outline Drawing
Figure 5. STEVAL-VNH5019A daughter board circuit diagram (1)
Figure 6. STEVAL-VNH5019A daughter board circuit diagram (2)
Figure 7. STEVAL-VNH5019A daughter board PCB design: top
Figure 8. STEVAL-VNH5019A daughter board PCB design: bottom layer
Figure 9. STEVAL-VNH5019A STM8 motherboard circuit diagram: I/O and ontology applications
Figure 10. STEVAL-VNH5019A STM8 motherboard circuit diagram: STM8 and power supply
Figure 11. STEVAL-VNH5019A STM8 motherboard circuit diagram: USB interface
Figure 12. STEVAL-VNH5019A STM8 motherboard top PCB design
Figure 13. STEVAL-VNH5019A STM8 motherboard bottom PCB design
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