Description:The ISL6617A uses Intersil’s proprietary Phase Doubler scheme to modulate two-phase power trains with single PWM input. It doubles the number of phases that 3. 3V multiphase controllers can support. The ISL6617A is designed to minimize the number of analog signals that interface between the controller and drivers in high phase count scalable applications. The common COMP signal, which is usually seen in conventional cascaded configurations, is not required; this improves noise immunity and simplifies the la
A good PCB layout for the ISL6617AFRZ involves separating the power and signal grounds, using a solid ground plane, and placing the input and output capacitors close to the IC. Additionally, the layout should minimize the loop area of the high-frequency currents to reduce electromagnetic interference (EMI).
The input capacitor should have a low equivalent series resistance (ESR) and be able to handle the input voltage ripple. The output capacitor should have a low ESR and be able to handle the output current. A general rule of thumb is to choose capacitors with a voltage rating of at least 1.5 times the input voltage and a capacitance value of 10-22uF for the input and 22-47uF for the output.
The ISL6617AFRZ has an operating ambient temperature range of -40°C to +85°C. However, the maximum junction temperature is 125°C, and the device should be derated above 70°C to ensure reliable operation.
The maximum output current of the ISL6617AFRZ depends on the input voltage, output voltage, and the thermal design of the system. A general rule of thumb is to use the following equation: Iout_max = (Vin - Vout) / (Rds(on) * 2), where Rds(on) is the on-resistance of the internal MOSFETs.
The enable pin (EN) is used to turn the device on and off. When the EN pin is high, the device is enabled, and when it is low, the device is disabled. This pin can be used to implement power sequencing, shutdown, and other power management functions.
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ISL6617AFRZ Overview
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