Load Drive Control Device

摘要

Provided is a load drive slope control device that can reduce EMI noise, and power loss and heat generation when a drive transistor is turned on and off, and can prevent excessive high temperature-induced damage to the drive transistor at an excessive high temperature. Disclosed is a load drive control device including: a drive transistor that drives a load; a pre-driver that drives the drive transistor via an ON/OFF control terminal of the drive transistor; a capacitor that is connected to an input side of the pre-driver, a first current source that is ON/OFF controlled by a first signal, and generates current which is charged to the capacitor; and a second current source that is ON/OFF controlled by a second signal, and generates current for discharging the capacitor, in which an output voltage from the pre-driver is changed by charging or discharging the capacitor, the drive transistor is turned on and off by the output voltage from the pre-driver, and a linear ascending gradient and a linear descending gradient of the waveform of a voltage driving the load are obtained by turning on and off the drive transistor.

主权项

1. A load drive control device comprising:
a drive transistor that drives a load; a pre-driver that drives the drive transistor via an ON/OFF control terminal of the drive transistor, a capacitor that is connected to an input side of the pre-driver; a first current source that is ON/OFF controlled by a first signal, and generates current which is charged to the capacitor, and a second current source that is ON/OFF controlled by a second signal, and generates current for discharging the capacitor, wherein an output voltage from the pre-driver is changed by charging or discharging the capacitor, wherein the amount of current of each of the first current source and the second current source can be changed by an ascending signal and a descending signal based on temperature information regarding the drive transistor, and the ascending and the descending of the signal is performed according to threshold values with hysteresis, and wherein the drive transistor is turned on and off by the output voltage from the pre-driver.