Description:High Current Output (+4.0/-6.0 A) at IGBT Miller Plateau voltages; Low VOH and VOL; DESAT Protection with Programmable Delay; Active Miller Clamp (NCV5703A only)
A good PCB layout for optimal thermal performance involves placing thermal vias under the device, using a solid ground plane, and keeping the thermal path as short as possible. A 4-layer PCB with a dedicated thermal layer is recommended. Refer to onsemi's application note AND9093/D for more details.
To select the right inductor, consider the inductor's saturation current, DC resistance, and core material. A good starting point is to use an inductor with a saturation current rating of at least 2x the peak current of the converter. onsemi recommends using inductors from reputable manufacturers like Coilcraft, Vishay, or TDK.
Although the datasheet specifies a maximum VIN voltage of 28V, it's recommended to limit the voltage to 24V to ensure reliable operation and to prevent damage from voltage spikes or transients.
To ensure proper biasing during startup, make sure the VIN pin is ramped up slowly (typically 10-20 ms) and the EN pin is pulled high after VIN has reached a minimum of 2.5V. This allows the internal bias circuitry to stabilize before the device starts switching.
For the output filter, use a low-ESR capacitor with a high ripple current rating, such as an X5R or X7R ceramic capacitor or a polymer capacitor. Avoid using electrolytic capacitors due to their high ESR and limited lifespan.
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NCV5703BDR2G Overview
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