In the automotive electronic system,the high-side driver,as a key power switch device,is widely used in 12V grounding load scenarios such as seat heating,lamp control and motor drive.It is not only responsible for the on and off of the circuit,but also undertakes the important tasks of intelligent protection and system diagnosis.
 

What is a high-side drive

High-side driver refers to the switching element between power supply and load,which can directly control the on-off of load and provide perfect diagnostic protection function.Compared with the traditional mechanical relay or low-side switch,the high-side driver has a higher level of integration and intelligence,which is especially suitable for use in vehicle-mounted environments with strict requirements on space and reliability.
 

Sharing of analog HD70xx4Q series single-channel high-side drivers for vehicle specifications

The analog HD70xx4Q series is a single-channel intelligent high-side driver specially designed for automotive 12V system,which has rich protection and diagnosis mechanisms,the input control pin is compatible with 3V/5V CMOS level,and can be flexibly adapted to various main control chips.HD70xx4Q integrates advanced protection functions,including load over-current limiting protection,relative over-temperature protection and over-temperature shutdown protection.In addition,the high-side driver HD70xx4Q IS internally integrated with a dedicated multi-function multiplexed analog output pin,which can provide complex diagnostic functions,including high-precision proportional load current detection,output overload and short-circuit alarm to ground,short-circuit diagnosis of VCC and open-circuit diagnosis of OFF state.The input SEN pin is the detection enable pin of HD70xx4Q,which can further disable the diagnostic function in the OFF state and obtain lower power consumption.
 

Diagnostic function of single-channel high-side driver

1.Real-time load current monitoring

2.Output overload and short circuit to ground alarm

3.OFF-state open-circuit load detection

4.Output short circuit diagnosis to VCC

5.CS diagnostic functions that can be enabled/disabled
 

Multiple protection of single-channel high-side driver

1.VCC undervoltage turn-off and overvoltage clamp

2.VDS negative pressure clamp protection

3.Thermal shutdown alarm and over-temperature protection

4.Over-current limitation and battery reverse connection protection

5.Over-temperature shutdown protection,relative over-temperature protection

6.Ground loss and VCC loss are automatically turned off

7.Battery reverse connection protection


Keywords: high-side driver