The VNH7100BASTR is a motor driver IC manufactured by STMicroelectronics. It is designed for driving DC motors, including those in automotive applications, with a focus on high- Power control.
1. Pin Function Specifications & Circuit Principle Instructions
The VNH7100BASTR comes in a HTSSOP-28 package (High Thermal Efficiency Shrink Small Outline Package). The IC has 28 pins in total, and these pins serve various functions, primarily focused on controlling motor operation, power management, and protection features.
Below is a detailed explanation of the pin functions for all 28 pins of the VNH7100BASTR.
Pin Number Pin Name Function Description 1 VCC Power supply pin, connects to the positive voltage supply. 2 GND Ground pin, connects to the system ground. 3 OUT1 Motor output 1, connects to the motor winding or load terminal. 4 OUT2 Motor output 2, connects to the motor winding or load terminal. 5 VBB Battery voltage input, supplies power to the internal circuitry. 6 M0 Mode selection pin (mode control for the IC, used for different operating modes). 7 M1 Mode selection pin (additional mode control for the IC). 8 FAULT Fault signal output pin, used to indicate fault conditions such as overcurrent or thermal shutdown. 9 OCP Overcurrent protection input, used to sense current and protect against overload. 10 TST Test pin, typically used for diagnostic purposes. 11 EN Enable pin, used to enable or disable the IC functionality. 12 VBOOT Boost voltage pin, used for the high-side driver circuit. 13 PHASE Phase input, determines the direction of motor rotation. 14 PWM Pulse Width Modulation input for motor speed control. 15 IN1 Motor control input 1, sets the motor direction in combination with IN2. 16 IN2 Motor control input 2, sets the motor direction in combination with IN1. 17 VOUT Motor output voltage feedback pin, provides motor voltage information. 18 NC No connection, typically not used. 19 ISENSE Current sense input, monitors the current going through the motor. 20 VCC2 Secondary power input pin, used for secondary internal voltage supply. 21 VS Supply voltage pin, provides power to the low-side driver circuitry. 22 VLS Low-side driver supply pin. 23 GND2 Secondary ground pin. 24 NC No connection, typically not used. 25 GND3 Ground pin for internal circuitry, connects to the system ground. 26 VCC3 Power supply pin for the internal logic and control. 27 NC No connection, typically not used. 28 VBS High-side gate driver voltage supply pin.2. Pin Functions and FAQs
FAQ (Frequently Asked Questions)Q: What is the function of pin 1, VCC, on the VNH7100BASTR? A: Pin 1, VCC, is the main power supply pin, providing the necessary voltage to operate the IC.
Q: How should pin 4, OUT2, be connected? A: Pin 4, OUT2, is the second motor output pin. It should be connected to one terminal of the motor winding or load.
Q: What does the FAULT pin (pin 8) indicate? A: The FAULT pin outputs a signal indicating a fault condition such as overcurrent, thermal shutdown, or undervoltage.
Q: How does the OCP (pin 9) protect the motor driver? A: The OCP pin is used for overcurrent protection, sensing excessive current to protect the IC from damage.
Q: What is the role of the TST pin (pin 10)? A: Pin 10, TST, is used for testing purposes, typically by engineers to run diagnostic checks on the IC.
Q: What happens when the EN (Enable) pin (pin 11) is activated? A: The EN pin enables or disables the IC. A logic high enables the device, while a logic low disables it.
Q: What is the purpose of the PHASE pin (pin 13)? A: The PHASE pin controls the direction of the motor by determining the switching state of the H-Bridge.
Q: How does the PWM pin (pin 14) control motor speed? A: The PWM pin inputs a pulse-width modulation signal that controls the speed of the motor based on duty cycle.
Q: Can pins IN1 and IN2 be used independently? A: No, IN1 and IN2 work together to determine motor direction. A combination of high and low inputs sets the direction.
Q: What is the purpose of the ISENSE pin (pin 19)? A: The ISENSE pin monitors the current flowing through the motor, helping to detect overcurrent conditions.
Q: How does the VOUT pin (pin 17) function? A: The VOUT pin provides feedback about the voltage across the motor, helping to monitor motor performance.
Q: What is the significance of the VBS pin (pin 28)? A: The VBS pin provides the supply voltage to the high-side driver circuitry, enabling it to drive the motor.
Q: What type of motor is suitable for the VNH7100BASTR? A: The VNH7100BASTR is typically used for driving DC motors in automotive and industrial applications.
Q: Can the VNH7100BASTR be used for high-speed motor control? A: Yes, it can be used for both low and high-speed motor control, depending on the PWM signal applied.
Q: How is thermal protection implemented in the VNH7100BASTR? A: The IC has built-in thermal protection that disables the output drivers in case of overheating.
Q: What is the maximum voltage rating for the VNH7100BASTR? A: The maximum supply voltage for the VNH7100BASTR is 40V.
Q: Can the VNH7100BASTR handle motor currents directly? A: Yes, it can handle high current motors directly, with a peak output current of up to 30A.
Q: Is it necessary to use a heatsink with the VNH7100BASTR? A: Depending on the application and power dissipation, a heatsink may be required to prevent thermal damage.
Q: What is the role of the VBOOT pin (pin 12)? A: The VBOOT pin supplies the necessary voltage for the high-side gate driver circuit, enabling the driver to control the high-side MOSFET.
Q: What does the "No Connection" (NC) pins mean? A: The NC pins are not internally connected to the IC’s circuitry and should be left unconnected.
This detailed explanation covers all the functions of the VNH7100BASTR's pins, providing a clear understanding of how each pin is used. If you need more detailed technical information or additional specifications, feel free to ask!