Description:The ISL59830 is a revolutionary device that allows true singlesupply operation of video amplifiers. The device runs off a single 3. 3V supply and generates the required negative voltage internally. This allows for DC-accurate coupling of video onto a 75Ω double-terminated line. Since the buffers have an integrated 6dB gain, no external gain setting resistors are required. An input reference voltage can be supplied to shift the analog video level down by an amount equal to the reference (typically 0. 6V).
A good PCB layout is crucial for the ISL59830IAZ-T7. Renesas recommends a 4-layer PCB with a solid ground plane, and to keep the analog and digital sections separate. Additionally, use short and wide traces for the power supply lines, and avoid vias under the IC. A reference design is available in the application note AN1995.
The output filter design is critical for the ISL59830IAZ-T7. Renesas recommends using a 2nd-order LC filter with a damping ratio of 0.5 to 1.5. The filter components should be chosen to provide a cutoff frequency of 1/10 to 1/5 of the switching frequency. A detailed design guide is available in the application note AN1995.
The ISL59830IAZ-T7 can tolerate an input voltage ripple of up to 10% of the nominal input voltage. However, it's recommended to keep the ripple below 5% to ensure stable operation and minimize the risk of overvoltage or undervoltage lockout.
To ensure EMC compliance, Renesas recommends using a shielded inductor, keeping the switching node (SW) away from sensitive analog nodes, and using a common-mode choke on the input lines. Additionally, follow the PCB layout guidelines and use a metal can or shielded package for the IC.
The thermal derating curve for the ISL59830IAZ-T7 is not explicitly provided in the datasheet. However, Renesas recommends following the thermal design guidelines in the application note AN1995, which provides a detailed thermal analysis and derating curves for the device.
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ISL59830IAZ-T7 Overview
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