Description:The ISL6722A and the ISL6723A are low power, single-ended pulse width modulating (PWM) current mode controllers designed for a wide range of DC/DC conversion applications including boost, flyback, and isolated output configurations. Similar to, and pin compatible with the ISL6721, the ISL6722A and ISL6723A offer a modified feature set. The ISL6722A replaces external synchronization with a low power SLEEP feature that reduces standby current to under 200µA. The ISL6723A changes the supply voltage UVLO thresh
The recommended PCB layout for the ISL6722AABZ involves placing the input and output capacitors close to the device, using a solid ground plane, and minimizing the loop area of the high-frequency currents. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended. Additionally, the device's thermal pad should be connected to a solid ground plane to ensure good thermal performance.
The selection of input and output capacitors for the ISL6722AABZ depends on the specific application requirements. In general, low-ESR capacitors with a high ripple current rating are recommended. The input capacitor should be able to handle the input voltage ripple and the output capacitor should be able to handle the output voltage ripple. A minimum capacitance of 10uF is recommended for both input and output capacitors.
The ISL6722AABZ can operate in an ambient temperature range of -40°C to +85°C. However, the device's junction temperature should not exceed 125°C. The device's thermal performance can be improved by using a heat sink or a thermal pad.
The ISL6722AABZ has a built-in overcurrent protection feature that can be implemented using an external resistor connected to the OC pin. The resistor value determines the overcurrent threshold. The device will shut down when the output current exceeds the set threshold. The device will automatically restart when the fault is removed.
Yes, the ISL6722AABZ can be used in a synchronous rectification configuration. The device's internal MOSFETs can be used as synchronous rectifiers, which can improve the converter's efficiency. However, the device's datasheet should be consulted for specific guidelines on implementing synchronous rectification.
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ISL6722AABZ Overview
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