A good PCB layout for the RH117K involves keeping the input and output traces short and separate, using a solid ground plane, and placing the input and output capacitors close to the device. Additionally, it's recommended to use a Kelvin connection for the output sense lines to minimize errors.
The input capacitor should be a low-ESR ceramic capacitor with a value between 1uF to 10uF, while the output capacitor should be a low-ESR electrolytic capacitor with a value between 10uF to 100uF. The capacitor values and types may vary depending on the specific application and operating conditions.
The RH117K can deliver up to 7A of output current, but this may vary depending on the input voltage, output voltage, and ambient temperature. It's recommended to check the device's thermal performance and power dissipation to ensure reliable operation.
The output voltage of the RH117K can be adjusted by using a resistive divider network between the output and the ADJ pin. The output voltage can be calculated using the formula: Vout = 2.5V x (1 + R1/R2), where R1 and R2 are the resistors in the divider network.
The EN (enable) pin is used to turn the device on or off. When the EN pin is pulled high, the device is enabled and operates normally. When the EN pin is pulled low, the device is disabled and enters a low-power shutdown mode.
RH117K datasheet
by Linear Technology
