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FAN8729_NL Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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FAN8729_NL Datasheet(HTML) 11 Page - Fairchild Semiconductor |
11 / 24 page FAN8729 11 Application Information 1. MUTE Function • MUTE circuit turns BTL output ON/OFF. • When MUTE terminal (pin42, pin43) is OPEN, or terminal voltage is lower than 1V, BTL is disable. • When MUTE terminal (pin42, pin43) is voltage is higher than 1.5V, BTL output operates normally. •Feature Table. 2. TSD Function • TSD circuit intercepts all IC output to protect the IC against high temperatures. • When chip temperature rises above 165°C, BTL and spindle output is disable. • When chip temperature falls below 140°C, BTL and spindle output operates normally. • TSD has hysteresis of 25°C. 3. TSD Monitor Function • TSD monitor circuit displays TSD status. • When TSD is ON, pin18 is HIGH. • When TSD is OFF, pin18 is LOW. • Since output pin(PIN18) is open-collector, pull-up resistance should be attached outside. •Feature Table. MUTE circuit voltage MUTE status Above 1.5V OFF Below 1V or Open ON TSD Pin18 TSD On High TSD Off Low 42 43 Output driver Bias Q0 SVCC IREF Hysteresis R1 R2 R3 Ihys 20k Q5 Q6 18 TSD SVCC VCC R(external) |
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Similar Description - FAN8729_NL |
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