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LC78602NE 데이터시트(PDF) 10 Page - Sanyo Semicon Device |
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LC78602NE 데이터시트(HTML) 10 Page - Sanyo Semicon Device |
10 / 11 page 6. Notes on Thermal Design The failure rate of semiconductor devices is accelerated by higher ambient temperatures and power dissipation levels. We strongly recommend taking changes in ambient conditions into account and providing as large a margin as possible in thermal design to assure high reliability. 7. Notes on Printed Circuit Board Pattern Design • Ideally, the influence of shared impedances should be minimized by separating the VDD and ground lines for each system. • Design VDD and ground lines to be as short and as wide as possible, and to have the lowest high-frequency impedance possible. Ideally, decoupling capacitors (0.01 to 1 µF) should be inserted in each VDD/ground pair. These capacitor should be placed as close to the corresponding VDD pin as possible. It is also appropriate to insert capacitors of about 100 to 220 µF between each VDD and ground as low-frequency filters. However, be careful not to use values that are too large for these capacitors, since that can result in latch-up. — In the servo system, the reference voltage line (VREF) and the driver VCC and ground lines are handled in the same way. The driver ground line should be made especially wide. If at all possible, use the recommended driver pattern, which, being directly under the device, was also designed to provide a heat dissipation effect as well. — If a current output pickup is used, locate the optical pickup element connector and the ASP RF input as close together as possible. Even if a voltage output type pickup is used, the I/V conversion resistor located at the ASP input should be located near the ASP RF input. • The EFM signal line should be made as short as possible, and should either be located away from adjacent lines or should be shielded from adjacent lines by VSS or VDD shield lines. Since the slice level control output (EFMO) can easily disrupt the EFM signal line, the resistor connected to the output pin should be located as close to the pin as possible. Note that reducing the value of this resistor increases the influence of radiation and cares must be taken for the output level when the value increases. • Cover the area around the crystal with the ground pattern. 8. Other Notes If you have any questions during the application design phase, do not hesitate to contact your Sanyo sales representative or the nearest Sanyo semiconductor sales office. This IC is specifically designed for use in CD players, and as such its specifications differ from those of general- purpose product standard logic ICs. We recommend system debugging using the end product system itself and adopting failsafe system design if required by the application. No. 6021-10/11 LC78602NE |
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