L6387D

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The L6387D is a MOS gate driver intended for use in high current power switch applications. The device has been designed to drive N-channel MOSFETs up to 6.5 A, allowing high power to be distributed from a single power source. Additionally, the L6387D is equipped with an onboard diagnostic capability, which can detect short-circuit or leakage conditions and generate an appropriate PWM-based fault signal.

The L6387D is part of the STMicroelectronics Power Management Integrated Circuits (PMIC) family, and is classified as a Gate Driver. Its main function is to drive (activate) MOSFETs in power switching applications.

The device is built with an integrated N-channel MOSFET and Schmitt trigger oscillator, and a half H-bridge driver suitable for driving the power MOSFETs. It is available in the L6387DV1 and L6387DV2 packages. The L6387DV1 package offers 6 output channels and the L6387DV2 offers 10 output channels.

The L6387D also features a voltage-mode PWM control scheme. This scheme uses a constant on-time scheme to ensure low steady-state harmonic content and low losses. The power switch is enabled when the input voltage is higher than the reference voltage and the PWM signal at the Gate Drive Opration pin (GDO) is high. When the input voltage is lower than the reference voltage (or the GDO signal is low) the power switch is disabled. The PWM signal can be generated with an analog switch, a logic device, or by a dedicated PWM generator processing the error signal.

The L6387D provides thermal shutdown protection to the power switch and its control circuit. In the event of an over-temperature situation, the power switch is disabled and its output pin sinks to ground, while the Gate Drive Opration pin (GDO) is pulled high, forcing the power switch into the disabled state.

The device also includes an onboard short-circuit detection circuit with a programmable time delay. When an output pin trips, the power switch is disabled and its output is forced to ground. The device also provides an on-board diagnostic circuitry that can monitor the power switch and its operation and generate a PWM-based fault signal if any unwanted conditions—such as short-circuit or leakage—are detected.

In summary, the L6387D is a high-current MOSFET gate driver designed for power switch applications. It features an integrated N-channel MOSFET and Schmitt trigger oscillator, as well as an onboard diagnostic capability. It is ideal for systems requiring high-current power switching, such as automotive applications, industrial motors and solenoid valves.

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