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
Digital Aggregators: Benefits of sourcing electronic components through them
Who are digital aggregators? An aggregator is often considered a distributor of data and in this context digital aggregators can be described as online web platforms... Read Article
Monolithic Power Systems’ Range with Farnell
Monolithic Power Systems (MPS) specialise in high-performance, integrated power solutions providing small, easy-to-use energy efficient solutions for industrial applications such as telecom infrastructures, cloud computing, automotive, as... Read Article
15% OFF Interconnect & Electromechanical at Future Electronics
The kind of deal you can’t miss  Electromechanical  Get the most out of your mechanical devices with a wide selection of electromechanical products offering nothing but... Read Article
Wide Bandgap Solutions
Featured Articles Silicon Carbide (SiC) and Gallium Nitride (GaN) are the next generation materials for high performance power conversion and electric vehicles. These wide bandgap (WBG)... Read Article
PS5 & XBOX Series X Giveaway
Traco Power & oemsecrets giveaway In our latest competition, we’ve teamed up with Traco Power to give 2 lucky subscribers the chance to win the latest... Read Article
November 2020 Deals from oemsecrets.com
Latest distributor offers and discount codes using oemsecrets.com Below are some of the discounts and offers exclusively available to our subscribers who search and purchase parts... Read Article