STMicroelectronics’ VND5004B – Drive Ground-Connected Loads Without a Sweat

Be it a fan, a turbine or any other kind of inductive or resistive load – keeping an eye on safety becomes difficult if large amounts of current flow. STM’s VND5004B and VND5004BSP30 high-side drivers are a nice way to work around the problem.

Understanding the part is best accomplished by looking at figure one. It shows an example of the VND5004 being interfaced to a microcontroller of choice. The resistors next to the GPIO pins are required to prevent latch-ups of the GPIO interface, as inductive loads can wreak all kinds of havoc in your circuit during switch-off.

Interfacing the VND5004 to a microcontroller is easy

Driving large currents – the datasheet maximum of the part is at 100A – requires both security precautions and careful PCB design. ST tries to make designer’s life easier with the pinout – figure two shows that the output pins are multiplied.

Furthermore, a pad at the bottom provides both Vcc and a first-class opportunity to attach a PCB heatsink directly to the ICs die. This, sadly, is a problem for hand assembly – if you don’t have a reflow oven in-house, pass assembly to another firm or buy one.

“Doubling” pins spreads current across the PCB

While undervoltage shutoff, thermal and short-circuit protection are relatively simple to understand, the official datasheet of the part does not provide any information on the actual voltage levels found at the sense pins – when used with an ADC; they are intended to provide feedback on the current drawn by the load.

More answers on this topic can be found in application note AN1596, which describes both the semiconductor topology used and gives practical advice on component behavour. When driving serious inductive loads, definitely do take a look at it before finishing your circuit.

Recent Articles
Go with OPTO! Watch this free Webinar about Broadcom’s Isolation Products in Electrical Chargers
Broadcom Webinar: Isolation Products for High Speed Inverters/Converters in Electrical Chargers DC fast chargers shorten charging time from hours to mere minutes. Such high-powered equipment requires... Read Article
Efficient DC Power Distribution in Data Centres
The consistent use of direct current in a data centre makes sense. Losses can be massively reduced. On the power side, the IEC has defined the... Read Article
AC/DC Power Supplies 15 – 450 W from Traco Power
Engineered to stay cool High performance, ultra-compact AC/DC power supplies with minimal heat dissipation. Available in four different mechanical packages, these high-efficiency power supplies utilize industrial grade... Read Article
Bluetooth Mesh Solutions for IoT Based Designs
Cypress Best-in-class Bluetooth Mesh Cypress’ Bluetooth Mesh Eval Kit is a multi-node platform featuring a certified Bluetooth 5 module, sensors, and multiple mesh example projects with... Read Article
Check out the newly expanded TE Connectivity Online Store!
Buy Now with PayPal The TE Store now accepts PayPal! This feature gives you a wider range of payment options and the ability to pay for... Read Article
Compact, low power microphone with IC Interface.
This high performance MEMS audio sensor from STMicroelectronics is desigined with an IC Interface and capacitive sensing element. Ideal for a number of applications such as... Read Article