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LA4425A Folha de dados(PDF) 7 Page - Sanyo Semicon Device |
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LA4425A Folha de dados(HTML) 7 Page - Sanyo Semicon Device |
7 / 8 page The overvoltage protector (VCCX 6 21.5 V) inside the IC is used to cut all bias routes and reverse bias between B-E of output stage elements, in order to increase the power line’s capability of handling positive surge. This means, of course, that a VCES (VCBO) type output stage element is used instead of the VCEO (VCER) type. . Load Resistance and Misoperation It should be noted that when RL < 2 Ω and VCC is high, and the switch is turned ‘‘ON’’ when setting is for a signal (THD = 10 %), the ground detector (current × voltage Schmitt circuit) operates momentarily. . Precautions on TaB If power voltage is applied to the IC substrate (the heat sink on a set), the IC structure is such that the PN junctions may be burned, causing deterioration or destruction. Consult Sanyo’s Quality Assurance Department with regard to the energy handling capability (voltage peak value, pulse width). Also, the IC TaB (substrate) is connected to pin 3, large signal GND. . Test of +VCC to Output Pin The power pin is in a floating state when a power capacitor is connected, so if +VCC touches output lines a and b, the upper power transistor inside the IC will be damaged. The LA4425A has a protective bypass route inside the IC. . Starting Time (ts) This is set at 0.35 sec/typ, but it can be made shorter by making input capacitor Ci smaller, or longer by making it larger. . Pop noise The pop noise prevention circuit operates to reduce pop until Rg reaches 50 k Ω. However, if Rg is left open, the charging route of input capacitor Ci is lost, so the pop noise reduction circuit stops operating and click noises become louder. . VG/OSC The voltage gain is fixed at 45 dB inside the IC. It is impossible to change it externally. Phase compensation capacitors (350 pF/total) are connected between individual stages inside the IC, and the open loop gain is low. In addition, the upper and lower drives are made equivalent so that final stage current gain is adjusted, providing a measure against unwanted high-frequency parasitic oscillation peculiar to power IC’s. . BTL Connection Connection is impossible with IC alone. . Reverse Mounting of IC The pin assignment is such that there is no danger of damage. . T.S.D (Thermal Shutdown) Operating Temperature Floating TC(°C) 30 × 30 × 1.5 mm3 thick Al board Ta = 25°C LA4425A No.3309-7/8 |
Nº de peça semelhante - LA4425A |
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Descrição semelhante - LA4425A |
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