How do I provide external power to my industrial USB hub? - StarTech.com IT Pro Community
<main> <article class="userContent"> <p>Industrial USB hubs offered by StarTech.com require an external power supply that connects to the terminal block on the hub.</p><p>To select a power supply, you need to determine the maximum power requirements (wattage) of the hub.</p><p>The equation you should use to determine the power requirements is <strong>P = 5 * I * N</strong>, where the following is true:</p><ul><li><strong>P</strong> is the power in watts.</li><li><strong>5 </strong>is the voltage of the USB port.</li><li><strong>I</strong> is the current of the USB port in Amps.<ul><li><strong>I</strong> = 0.5 A for USB 2.0.</li><li><strong>I</strong> = 0.9 A for USB 3.0.</li></ul></li><li><strong>N</strong> is the number of USB ports.</li></ul><p>For example, a four-port USB 3.0 hub's maximum power requirement is P = 5 * 0.9 * 4. Therefore, the minimum wattage of the power supply for the four-port USB 3.0 hub is 18 watts.</p><p>When you determine the power requirements of the hub, you can choose a power supply. The following criteria must be met when you select the power supply:</p><ul><li>The voltage must be within 7 to 24 or 7 to 40 Volts DC, depending on the specifications of the USB hub.</li><li>The power supply must convert AC to DC (no AC output).</li><li>The power rating is equal or greater to the requirements of the hub.</li></ul><p>Most power supplies come with a rating in volts (V) and amps (A). To determine the current in amps, use <strong>I = P / V</strong>, where the following is true:</p><ul><li><strong>I</strong> is the current of the power supply.</li><li><strong>P</strong> is the calculated power of the hub.</li><li><strong>V</strong> is the chosen voltage of the power supply (between 7 to 24 or 7 to 40 volts).</li></ul><p>For example, if a hub requires 18 W and you choose a 12 V power supply, the current of the power supply would be I = 18/12, I = 1.5A.</p><p><br></p><p><br></p><div class="blockquote"><div class="blockquote-content"><p class="blockquote-line">This FAQ applies to these products:</p><p class="blockquote-line"><a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fst1030usbm" rel="nofollow noreferrer ugc">ST1030USBM</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fst4200mini2" rel="nofollow noreferrer ugc">ST4200MINI2</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fst4200usbm" rel="nofollow noreferrer ugc">ST4200USBM</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fst4300usbm" rel="nofollow noreferrer ugc">ST4300USBM</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fst7200usbm" rel="nofollow noreferrer ugc">ST7200USBM</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fst7300usbm" rel="nofollow noreferrer ugc">ST7300USBM</a> <a href="https://community.startech.com/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.startech.com%2Fen-us%2Fcards-adapters%2Fst7300usbme" rel="nofollow noreferrer ugc">ST7300USBME</a> 5G4AINDNP-USB-A-HUB USB210AIND-USB-A-HUB</p></div></div><p><br></p> </article> </main>
