Overview
The L99ASC03TR, produced by STMicroelectronics, is a multifunctional system IC designed specifically for three-phase motor control applications in the automotive sector. This device is engineered to control six external N-channel MOSFETs in a bridge configuration, enabling the efficient operation of three-phase motors. It features a voltage regulator to supply an external microcontroller and an operational amplifier for motor current sensing. The integrated Serial Peripheral Interface (SPI) allows for the adjustment of device parameters, control of operating modes, and the reading of diagnostic information.
Key Specifications
| Parameter | Value |
|---|---|
| Max Supply Voltage | 28 V |
| Min Operating Temperature | -40 °C |
| Min Supply Voltage | 6 V |
| Operating Supply Voltage | 28 V |
| Voltage Regulator Output | 5 V, 200 mA continuous mode |
| Current Consumption in Standby Mode | |
| PWM Operation Frequency | Up to 80 kHz |
| Package Type | TQFP48 7 x 7 x 1 mm with Exposed Pad (4.5 x 4.5 mm) |
| Grade | Automotive |
| RoHS Compliance Grade | Ecopack2 |
Key Features
- Automotive qualified
- 5 V low-drop voltage regulator (200 mA continuous mode)
- Very low current consumption in standby mode (typ. 15 µA)
- ST SPI interface for control and diagnostics
- Window watchdog and fail-safe functionality
- Two separate power supply pins
- Three half-bridge drivers to control external MOSFETs (configurable by SPI)
- Full drive of external MOSFETs down to 6 V input voltage
- Input pin for each gate driver (with cross-current protection)
- Two-stage charge pump supporting 100% duty cycle
- PWM operation up to 80 kHz (not restricted)
- Current-sense amplifier (configurable by SPI)
- Disable input to turn off gate driver outputs
- Analog multiplexer output to monitor external power supply voltages and internal junction temperature
- Advanced BEMF detection IP
- Overcurrent protection (programmable)
- Drain-source monitoring and open-load detection
Applications
The L99ASC03TR is designed for various mechatronic three-phase motor applications in the automotive sector, including:
- Engine cooling fans
- Fuel pumps
- Water pumps
- Oil pumps
Q & A
- What is the primary function of the L99ASC03TR?
The L99ASC03TR is a multifunctional system IC designed for three-phase motor control applications, particularly in the automotive sector.
- What type of voltage regulator does the L99ASC03TR feature?
The device features a 5 V low-drop voltage regulator capable of supplying up to 200 mA in continuous mode.
- How does the SPI interface contribute to the device's functionality?
The integrated SPI interface allows for the adjustment of device parameters, control of operating modes, and the reading of diagnostic information.
- What is the maximum PWM operation frequency supported by the L99ASC03TR?
The device supports PWM operation up to 80 kHz without restrictions.
- What kind of protection does the L99ASC03TR offer against overcurrent conditions?
The device features programmable overcurrent protection, which can be set via SPI, and includes options to disable gate drivers upon overcurrent detection.
- How does the device handle thermal management?
The L99ASC03TR includes thermal warning and shutdown features, which can be configured via SPI to set different temperature thresholds and actions.
- What is the purpose of the BEMF detection module in the L99ASC03TR?
The BEMF (back electromotive force) module provides a flexible means to support motor control by detecting and processing the back electromotive force of the motor.
- What are the different operating modes of the L99ASC03TR?
The device can operate in Active Mode, Flash Mode, VDD Standby Mode, and VBAT Standby Mode, each with specific functionalities and power consumption profiles.
- How does the device protect against cross-current in the gate drivers?
The gate drivers feature cross-current protection with a programmable dead-time to prevent simultaneous activation of high-side and low-side MOSFETs.
- What is the role of the analog multiplexer in the L99ASC03TR?
The analog multiplexer provides an output voltage proportional to the input supply voltages, internal junction temperature, or CSA reference voltage, configurable via SPI.
