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IR3721MTRPBF Datasheet(PDF) 4 Page - International Rectifier |
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IR3721MTRPBF Datasheet(HTML) 4 Page - International Rectifier |
4 / 16 page IR3721 DATA SHEET Page 4 of 16 www.irf.com 07/14/08 IC PIN FUNCTIONS VDD PINS These pins provide operational bias current to circuits internal to the IR3721. Bypass them with a high quality ceramic capacitor to the GND pins. GND PINS These pins return operational bias current to system ground. VO is measured with respect to GND. The GND pin sinks reference current established by the external resistor RT. VO PIN Since this pin measures DCR voltage drop it is critical that it be Kelvin connected to the buck inductor output. Power accuracy may be degraded if the voltage at this pin is below VOmin. VCS PIN A switched current source internal to the IR3721 maintains the average voltage of this pin equal to the voltage of the VO pin. The average current into this pin is therefore proportional to buck inductor current. VRT PIN A voltage reference internal to the IR3721 drives the VRT pin while the pin current is monitored and used to set the amplitude of the current monitor switched current source IREF. Connect this pin to GND through a precision resistor network RT. This network may include provision for canceling the positive temperature coefficient of the buck inductor’s DC resistance (DCR). VK PIN The voltage of the VK pin is used to modulate the amplitude of the DI pin. This is one of the terms used to determine the product of the multiplier output. If VK is connected to a fixed voltage then the output of the multiplier is proportional to current. If VK is connected to the buck converter output voltage then the output of the DI driven RC filter is proportional to power. DI PIN The Dl pin output has a duty ratio proportional to the current into VCS, and an amplitude equal to the voltage at the VK pin. The DI pin is intended to drive an external low pass filter. The output of this filter is the product of the current and voltage terms. |
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