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LA4485 Datasheet(PDF) 3 Page - Sanyo Semicon Device |
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LA4485 Datasheet(HTML) 3 Page - Sanyo Semicon Device |
3 / 20 page Recommended LA4485 External Parts Arrangement (Dual-mode) IC Usage Notes Maximum ratings Care must be taken when operating the LA4485 close to the maximum ratings as small changes in the operating conditions can cause the maximum ratings to be exceeded, thereby breakdown will be caused. Printed circuit board connections Care must be taken when designing the circuit of printed board so as not to form feedback loops, particularly with the small-signal and large-signal ground connections. Notes on LA4485 heatsink mounting 1. Mounting torque must be in the range 39 to 59 Nvcm. 2. The spacing of the tapped holes in the heatsink must match the spacing of the holes in the IC tab. 3. Use screws with heads equivalent to truss head machine screws and binding head machine screws stipulated by JIS for the mounting screws. Furthermore, washers must be used to protect the surface of the IC tab. 4. Make sure that there is no foreign matter, such as cutting debris, between the IC tab and the heatsink. If a heat conducting compound is applied between the contact surfaces, make sure that it is spread uniformly over the entire surface. 5. Because the heatsink mounting tab and the heatsink are at the same electric potential as the chip’s GND (large signal GND), care must be taken when mounting the heatsink on more than one device. 6. The heatsink must be mounted before soldering the pins to the PCB. Comparison of External Parts Required External parts Existing device LA4485 Output coupling capacitors Yes Yes Input coupling capacitors Yes Yes Bootstrap capacitors Yes No Feedback capacitors Yes No Filter capacitor Yes Optional Phase compensating capacitor Yes No Oscillation-quenching mylar capacitors Yes No Oscillation-quenching resistors Yes No Others No Optional Total (for dual-mode) 15 to 16 parts 4 to 6 parts Note: Supply capacitors, contained within the power IC, are not counted in both existing and new devices. 95.0 × 67.0 mm2 LA4485 No.3680-3/20 |
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Similar Description - LA4485 |
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