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IR3725 Datasheet(PDF) 4 Page - International Rectifier |
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IR3725 Datasheet(HTML) 4 Page - International Rectifier |
4 / 19 page IR3725 Data Sheet Page 4 of 19 www.irf.com 2008_12_09 PIN DESCRIPTION NAME NUMBER I/O LEVEL DESCRIPTION VCS1 1 Analog 12V Current sensing input 1 VCS2 2 Analog 12V Current sensing input 2 VO 3 Analog 12V Voltage sensing input VT 4 Analog Thermistor sensing input GND 5 0V IC bias supply and signal ground VDD 6 3.3V 3.3V bias supply EXTCLK 7 3.3V Digital Input for optional external clock ADDR 8 3.3V Digital Bus Address selection input SCL 9 3.3V Digital Bus Clock; Input only SDA 10 3.3V Digital Bus Data; Input / Open drain output ALERT# 11 3.3V Digital Programmable output function; Open drain output clamped to VDD NC 12 Do not connect IC PIN FUNCTIONS VDD PIN This pin provides operational bias current to circuits internal to the IR3725. Bypass it with a high quality ceramic capacitor to the GND pin. GND PIN This pin returns operational bias current to its source. It is also the reference to which the voltage VO is measured, and it sinks the reference current established by the external resistor RT. VO PIN This pin is to be electrically connected to the location in the circuit where voltage for the power calculation is desired to be monitored. Power accuracy may be degraded if the voltage at this pin is below VOmin. VCS1 AND VCS2 PINS The average current into these pins is used to calculate power. Current sources internal to the IR3725 will null the average voltage between this pin pair. VT FUNCTION A voltage internal to the IR3725 drives the VT pin while the pin current is monitored and used to set the amplitude of the switched current source IT. This pin should be connected to GND through a precision resistor network RT. This network may include provision for canceling the positive temperature coefficient of the inductor’s DC resistance (DCR). ALERT# FUNCTION The ALERT# pin is a multi-use pin. During normal use it can be configured via the serial bus as an open drain ALERT# pin that will be driven logic low when new data is available in the output register. After the output register has been read via the serial bus the ALERT# will be released to its high resistance state. This pin can also be programmed to pull low when the output exceeds the programmable level. |
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Similar Description - IR3725 |
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