LX1684 PDF Datasheet


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Description

This is Voltage-Mode PWM Controller. LX1684 L I N F I N I T Y D I V I S I O N Voltage-Mode PWM Controller P RODUCTION DESCRIPTION KEY FEATURES W W W. Microsemi . COM The LX1684 is a monolithic, voltagemode pulse-width modulator controller. It is designed to implement a flexible, low cost buck (step-down) regulator supply with a minimal of external components. The LX1684 has a synchronous driver for higher efficiency and is optimized to provide 12V to 3.3V or 12V to 2.5V regulation. It also can be used to convert 5V or 3.3V to voltages as low as 1.25V. Switching frequency is fixed at 175kH- for optimal cost and space. Short-circuit current limiting can be implemented without expensive current sense resistors. Similar to the LX1682 in function but with the positive side of the current sense comparator brought out (CSP) to allow it to be referenced to the topside FET. Current is sensed using the voltage drop across the RDS(ON) of the MOSFET this sensing is delayed for 1 s to eliminate MOSFET ringing errors. Hiccup-mode.