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KA9259CDTF Datasheet(PDF) 8 Page - Fairchild Semiconductor |
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KA9259CDTF Datasheet(HTML) 8 Page - Fairchild Semiconductor |
8 / 15 page KA9259D 8 Application Information 1. MUTE • When the mute pin #7 is open or the voltage of the mute pin #7 is below 0.5V, the mute circuit is activated so that the output circuit will be muted. • When the voltage of the mute pin is above 2V, the mute circuit is disabled and the output circuit operates normal. • If the chip temperature rises above 175 °C, then the TSD (Thermal shutdown) circuit is activated and the output circuit is muted. 2. TSD (THERMAL SHUTDOWN) •The VREF BG is the output voltage of the band-gap-referenced biasing circuit and acts as the input voltage of the TSD circuit. • The base-emitter voltage of the TR, Q11 is designed to turn-on at below voltage. VBE = VREF BG × R12 / (R11+R12) = 400mV • When the chip temperature rises up to 175 °C, then the turn-on voltage of the Q11 would drop down to 400mV. Hence, the Q11 would turn on so the output circuit will be muted. 3. REGULATOR Pin #7 Mute circuit High Turn-off Low Turn-on 7 Output driver bias VREF BG R11 R12 Q11 Output driver bias 5 6 + − I VREF BG D1 R1 D2 KSB772 VOUT (5V) CE 100 µF + R2 R3 |
Similar Part No. - KA9259CDTF |
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Similar Description - KA9259CDTF |
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