Description:The ISL6726 is a highly featured single-ended PWM controller intended for applications using the active clamp forward converter topology in either n- or p-channel active clamp configurations, the asymmetric half-bridge topology, and the standard forward topologies with synchronous rectification. It is a current-mode PWM controller with many features designed to simplify its use. Among its many features are a precision oscillator which allows accurate control of the deadtime and maximum duty cycle, bi-direct
A good PCB layout for the ISL6726AAZ-T should prioritize thermal management, noise reduction, and signal integrity. Keep the switching node (SW) away from sensitive analog nodes, and use a solid ground plane to reduce EMI. Place the input and output capacitors close to the IC, and use short, wide traces for the power paths.
Choose input capacitors with low ESR and high ripple current ratings to handle the input voltage ripple. For output capacitors, select ones with low ESR, high capacitance, and a voltage rating that exceeds the output voltage. The datasheet recommends a minimum of 10uF for the input capacitor and 22uF for the output capacitor.
The maximum ambient temperature for the ISL6726AAZ-T is 85°C. As the ambient temperature increases, the device's performance may degrade, including reduced efficiency, increased output voltage ripple, and decreased output current capability. Ensure proper thermal management and heat sinking to maintain optimal performance.
The ISL6726AAZ-T has a built-in overcurrent protection feature that can be enabled by connecting the OCP pin to a resistor divider network. The OCP threshold can be set by selecting the appropriate resistor values. The device will shut down if the output current exceeds the set threshold.
The recommended startup sequence is to first apply the input voltage, followed by the enable signal (EN). This ensures that the internal bias voltage is established before the device starts switching. Avoid applying the enable signal before the input voltage, as this can cause damage or malfunction.
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ISL6726AAZ-T Overview
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