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CAT3612 Datasheet(PDF) 11 Page - Catalyst Semiconductor |
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CAT3612 Datasheet(HTML) 11 Page - Catalyst Semiconductor |
11 / 14 page CAT3612 © Catalyst Semiconductor, Inc. 11 Doc. No. MD-5016 Rev. B Characteristics subject to change without notice Protection Mode If an LED becomes open-circuit, the output voltage VOUT is internally limited to about 5.5V. This is to prevent the output pin from exceeding its absolute maximum rating. The driver enters a thermal shutdown mode as soon as the die temperature exceeds about +165ºC. When the device temperature drops down by about 20ºC, the device resumes normal operation. External Components The driver requires a total of four external 1 μF ceramic capacitors: two for decoupling input and output, and two for the charge pump. Both capacitor types X5R and X7R are recommended for the LED driver application. In the 1.5x charge pump mode, the input current ripple is kept very low by design, and an input bypass capacitor of 1 μF is sufficient. In 1x mode, the device operating in linear mode does not introduce switching noise back onto the supply. Recommended Layout In 1.5x charge pump mode, the driver switches internally at a high frequency of 1MHz. It is recommended to minimize trace length to all four capacitors. A ground plane should cover the area under the driver IC as well as the bypass capacitors. Short connection to ground on capacitors Cin and Cout can be implemented with the use of multiple via. A copper area matching the TDFN exposed pad (GND) must be connected to the ground plane underneath. The use of multiple via improves the package heat dissipation. Figure 5. Recommended Layout |
Similar Part No. - CAT3612_08 |
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Similar Description - CAT3612_08 |
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