10A Step-Down DC/DC Converter
Created: Jul 27, 2016
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Step-down DC-to-DC converter also known as “buck converter” is a power converter, which lowers down the voltage coming from the input source to the load while rising up or maintaining its current rating. The reference design is a 10A step-down converter, which features ISL8200AM from Intersil. The reference design is an evaluation board, which can function in a standalone single-phase operation well as current shared applications where multiple modules are connected in parallel. The ISL8200AM is a high power, current-sharing DC/DC power module for Datacom/Telecom/ FPGA power hungry applications.
The PVIN and GND banana plugs are the input terminals. The input voltage is from 3V to 20V, and the output can support a 10A maximum load with a voltage range from 0.6V up to 6V with the proper output capacitor rating. Two 270uF capacitors are used for ripple current. The VSEN+ and VSEN- are voltage sensing points which can be utilized to monitor and evaluate the voltage regulation of the system, thus using it as sensing points, user must consider increasing resistance of RM+2 and RM-2 up to 10Ω which is initially 0Ω. The JP201 is a session initiation protocol connector which can be used with R223 = 0Ω installed to inject a clock signal to synchronize the module. Shorting the jumper marked FIXED and populating R209A’s location can set the current limit of the circuit. Another option is to short jumper ADJ1 and use potentiometer R241 to set the current limit.
The ISL8200AM can be easily connected in parallel with other ISL8200AM modules and current share providing an additional 10A per phase. The ISL8200AM typically can be applied in data communication, industrial and medical equipment, servers, and point of load regulation applications.