Description:The AS3824 is a 16-channel LED TV backlight controller which performs local dimming of sections of a display screen to provide both improved picture quality and valuable power savings of up to 20% to 30%.The AS3824 backlight controller is intended for use in the latest high-definition (HD) and ultra-high-definition (UHD, or 4K) televisions, as well as high dynamic range (HDR) monitors and displays.The AS3824 includes a fully flexible 12-bit PWM generator for each of its 16 channels, to enable sections of a
Renesas provides a recommended PCB layout guide in their application note (AN1844) for the AS3824A1-ZQFT, which includes thermal pad connections, thermal vias, and copper pours to ensure efficient heat dissipation.
To ensure reliable operation in high-temperature environments, it's essential to follow the recommended operating conditions, use a suitable thermal interface material, and implement a robust thermal management system, such as a heat sink or fan, to keep the junction temperature within the specified range.
The input capacitor (CIN) should be a low-ESR ceramic capacitor with a value between 4.7uF to 10uF, and the output capacitor (COUT) should be a low-ESR ceramic capacitor with a value between 10uF to 22uF, placed as close as possible to the IC pins to minimize parasitic inductance.
To troubleshoot issues with the power-good (PG) signal, check the output voltage, input voltage, and enable pin (EN) status. Ensure that the output voltage is within the specified range, the input voltage is above the UVLO threshold, and the enable pin is properly driven. Also, verify that the PG pin is not overloaded or short-circuited.
Renesas provides a recommended soldering and rework procedure in their application note (AN1845) for the AS3824A1-ZQFT, which includes guidelines for soldering temperature, time, and techniques to prevent damage to the device.
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AS3824A1-ZQFT Overview
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