Overview
The L9825TR, produced by STMicroelectronics, is an Octal Low-Side Driver Circuit specifically designed for automotive applications. This integrated circuit features eight power low-side-driver outputs, making it suitable for controlling resistive and inductive loads. The device includes output voltage clamping for flyback current recirculation, which is essential when driving inductive loads. It also supports both serial and parallel input control, along with comprehensive output protection and diagnostic capabilities.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | -0.3 to 7 | V |
| Output Current (Out1 to Out6) | Up to 2.05 | A |
| Output Current (Out7, Out8) | Up to 1.75 | A |
| Output Voltage Clamp | Typical 50 | V |
| Thermal Shutdown Threshold | Typical 165 | °C |
| Thermal Resistance (Single Output) | Maximum 13 | °C/W |
| Thermal Resistance (All Outputs) | Maximum 1.6 | °C/W |
| Standby Current | Typical 5 | mA |
| Operating Current | Typical 5 mA (IOUT1 ... 8 = 500mA, SPI - CLK = 3MHz) | mA |
Key Features
- Output Control: Outputs 1 and 2 can be controlled via parallel or serial inputs, while outputs 3 to 8 are controlled via SPI.
- Output Protection: Includes overcurrent shutdown for outputs 1 to 6 and short circuit current limitation with selective thermal shutdown for outputs 7 and 8.
- Voltage Clamping: Provides intrinsic output voltage clamping at a typical value of 50V for flyback current recirculation.
- Diagnostics: Outputs status data available via SPI, with fault conditions such as overcurrent, thermal overload, open load, and short circuit to GND.
- Reset Function: Chip internal reset via external nRes signal or internally generated undervoltage signal.
- Thermal Management: Thermal shutdown threshold at 165°C to prevent overheating.
Applications
The L9825TR is primarily designed for automotive applications, including the control of various loads such as resistive and inductive loads, lamps, and other automotive systems. It is also suitable for applications requiring robust output protection and diagnostic capabilities.
- Automotive lighting systems
- Automotive electrical systems
- Control of inductive and resistive loads
- Systems requiring high reliability and diagnostic features
Q & A
- What is the primary application of the L9825TR?
The L9825TR is primarily designed for automotive applications.
- How many output channels does the L9825TR have?
The L9825TR has eight power low-side-driver output channels.
- What is the maximum output current for outputs 1 to 6?
The maximum output current for outputs 1 to 6 is up to 2.05 A.
- What is the typical output voltage clamp value?
The typical output voltage clamp value is 50 V.
- How are outputs 1 and 2 controlled?
Outputs 1 and 2 can be controlled via parallel or serial inputs.
- What kind of protection does the L9825TR offer for outputs 7 and 8?
The L9825TR offers short circuit current limitation with selective thermal shutdown for outputs 7 and 8.
- How does the diagnostic feature work?
The diagnostic feature allows the output status data to be read via SPI, detecting fault conditions such as overcurrent, thermal overload, open load, and short circuit to GND.
- What is the thermal shutdown threshold of the L9825TR?
The thermal shutdown threshold is typically 165°C.
- Can the L9825TR be used in high-current applications?
Yes, for higher current driving capability, two outputs of the same kind can be paralleled.
- How is the reset function implemented in the L9825TR?
The reset function is implemented via an external nRes signal or an internally generated undervoltage signal.
