Description:Support is limited to customers who have already adopted these products.The ISL8843 is an industry standard drop-in replacement for the popular 28C43 and 18C43 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 oper
The maximum input voltage that can be applied to the ISL8843ABZ-T 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, make sure to follow the recommended layout guidelines, use a sufficient output capacitor with a low ESR, and add a feedback capacitor (CFB) as specified in the datasheet. Additionally, ensure that the input voltage is within the specified range and the output current is within the maximum rating.
The EN (Enable) pin is used to enable or disable the regulator. When the EN pin is pulled high (above 1.4V), the regulator is enabled, and when it's pulled low (below 0.4V), the regulator is disabled. You can use the EN pin to implement power sequencing, shutdown, or low-power modes in your design.
The output voltage of the ISL8843ABZ-T can be calculated using the formula: VOUT = VREF x (1 + R1/R2), where VREF is the internal reference voltage (1.2V), R1 is the feedback resistor, and R2 is the divider resistor. You can use the datasheet's resistor selection guide to determine the values of R1 and R2 for your desired output voltage.
The thermal shutdown temperature of the ISL8843ABZ-T is typically around 150°C to 160°C. When the junction temperature exceeds this threshold, the regulator will shut down to prevent damage. The thermal shutdown is an automatic feature that doesn't require any external components.
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ISL8843ABZ-T Overview
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