Description:The ISL884xA is a high performance drop-in replacement for the popular 28C4x and 18C4x PWM controllers suitable for a wide range of power conversion applications including boost, flyback, and isolated output configurations. Its fast signal propagation and output switching characteristics make this an ideal product for existing and new designs. Features include 30V operation, low operating current, 90µA start-up current, adjustable operating frequency to 2MHz, and high peak current drive capability with 20ns
The maximum input voltage that can be applied to the ISL8840AABZ is 24V, but it's recommended to operate within the specified input voltage range of 6.5V to 18V for optimal performance and reliability.
To ensure the stability of the output voltage, it's essential to follow the recommended layout guidelines, use a suitable output capacitor with low ESR, and ensure that the input voltage is within the specified range. Additionally, the output voltage can be adjusted using the FB pin, and the output voltage stability can be improved by adding a capacitor between the VOUT and GND pins.
The EN (Enable) pin is used to enable or disable the device. When the EN pin is pulled high (above 1.4V), the device is enabled, and when it's pulled low (below 0.4V), the device is disabled. This pin can be used to implement power sequencing, shutdown, or low-power standby modes in the system.
The output current capability of the ISL8840AABZ depends on the input voltage, output voltage, and ambient temperature. The maximum output current can be calculated using the equation: IOUT_MAX = (VIN - VOUT) / (RDS(ON) * 2), where RDS(ON) is the on-resistance of the internal FET. The maximum output current is typically around 4A, but it's recommended to derate the current based on the ambient temperature and other system requirements.
The ISL8840AABZ has a thermal shutdown feature that protects the device from overheating. To ensure reliable operation, it's essential to provide adequate heat sinking, follow the recommended PCB layout guidelines, and ensure good airflow around the device. The maximum junction temperature (TJ) should not exceed 150°C, and the device should be operated within the specified thermal derating curves.
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ISL8840AABZ Overview
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