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LA4485 Datasheet(PDF) 18 Page - Sanyo Semicon Device |
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LA4485 Datasheet(HTML) 18 Page - Sanyo Semicon Device |
18 / 20 page . Taking BTL coupling into consideration, the output-to-supply/output-to-ground protector is two-sided in order to protect both the IC and the speaker. When using this method (simultaneously shorting the outputs to supply and to ground) In BTL mode, the IC protection function works even in noninverted output → output-to-supply mode, inverted output → output-to-ground mode. (The reverse is also OK.) Reference Value (a) Short-circuit test for dual-mode operation after the main and standby switches are turned ON. Conditions: 1 VCC =10to16 V,RL =4 Ω and PO = 1 to 5 W (variable) for load short-circuit 2 V CC =10to16 V,RL =4 Ω, Rg = 0 (no signal) for output-to-supply short-circuit 3 V CC =10to16 V,RL =4 Ω, Rg = 0 (no signal) for output-to-ground short-circuit. Z: impedance j: no device breakdown 1 Load short-circuit 2 Output-to-supply short-circuit 3 Output-to-ground short-circuit One-time test Repeated switching test One-time test Repeated switching test Z=0 Z=0.5 Ω Z=0 Z=0.5 Ω Z=0 Z=0.5 Ω Z=0 Z=0.5 Ω j jjjjjjjj (b) Short-circuit test for dual-mode operation (opposite flow of (a)) after the main and standby switches are turned ON. Conditions: same as (a) j: No device breakdown 1 Load short-circuit 2 Output-to-supply short-circuit 3 Output-to-ground short-circuit One-time test Repeated switching test One-time test Repeated switching test Z=0 Z=0.5 Ω Z=0 Z=0.5 Ω Z=0 Z=0.5 Ω Z=0 Z=0.5 Ω j jjjjjjjj (Note) Shorting the outputs to ground when muting is active can result in device breakdown. Current × voltage detector Self-holding positive feedback circuit Reset circuit CH1/CH2 Upper/lower power transistor control Short-circuit to GND protection 1 Load short-circuit 2 Output-to-supply short-circuit 3 Output-to-ground short-circuit . BTL-mode short-circuit test circuit Non- inverting Inverting LA4485 No.3680-18/20 |
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