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LA4525 Datasheet(PDF) 8 Page - Sanyo Semicon Device |
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LA4525 Datasheet(HTML) 8 Page - Sanyo Semicon Device |
8 / 8 page ![]() External Components . The starting time, ts, can be varied by changing the value of the input capacitor. A value of 2.2 µF is recommended. A smaller value will result in a lower starting time, and a larger value, a higher starting time. . The output capacitor should have a value of 470 µF. A lower value will cause the low-frequency roll-off and low-power characteristics to deteriorate. . A value of 470 µF is recommended for the power supply capacitor, although this can change according to the design setup conditions. . In dual mode, BTL IN (the channel 2 negative feedback connection) should be left floating. BTL mode . The output capacitors should have a value of 470 µF. If these are omitted, a ‘‘popping’’ noise occurs. Also, any output offset will cause a current to flow which could damage the load under quiescent DC conditions. . The output capacitors can be replaced with a single 220 µF bipolar capacitor. A larger value can cause switching noise when power is applied to the device. . The voltage gain is fixed internally to 40 dB in dual mode and 46 dB in BTL mode. These values cannot be altered by connecting external components. . Phase correction capacitance (600 pF/TOTAL) is incorporated in the internal stages. Oscillation damping components (R and C) are also incorporated in the output pin circuits. . Power consumption Note that the 8-pin DIP does not have a heat dissipating surface and that the power dissipation ratings are critical. The maximum power dissipation of the device is 1.25 W, and 1.5 W when the device is mounted on the recommended PCB. The actual power dissipated depends on the supply voltage and the load conditions. Ensure that the device is kept within its maximum rating. For AC supplies, transformer tappings may need to be adjusted to keep the device within maximum ratings. Pd max = VCC 2 π2R L +ICCO × VCC Note For BTL mode operation, the value of RL used in the calculation should be 1/2 the actual value. . If the speaker plug jacks short to ground when connected, a protection resistor should be inserted in the output line. . If the device is operated at or near its rated values, these values can be exceeded by small changes in operating conditions, leading to device breakdown. Accordingly, ensure that a safety margin is maintained so as not to exceed the maximum ratings. . Check the PCB surface after soldering to ensure that no pins have been accidentally shorted. Any short between pins could cause poor operating characteristics or permanently damage the device when power is applied. . If making the PCB, check the printed wiring to ensure that no feedback loops occur between input and output. No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of March, 1996. Specifications and information herein are subject to change without notice. RL LA4525 No.4022-8/8 |
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