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SM6801AB データシート(PDF) 9 Page - Nippon Precision Circuits Inc

部品番号 SM6801AB
部品情報  Class-D Mono Amplifier for Portable Device
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メーカー  NPC [Nippon Precision Circuits Inc]
ホームページ  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM6801AB データシート(HTML) 9 Page - Nippon Precision Circuits Inc

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SM6801A
SEIKO NPC CORPORATION —9
FUNCTIONAL DESCRIPTION
Power-down (PDWN)
The device enters power-down mode when PDWN goes LOW. When powered-down, the outputs become high
impedance and the internal oscillation stops. In power-down mode, the MUTEN pin should be held LOW.
Mute (MUTEN)
Mute operation occurs when MUTEN goes LOW. In mute mode, the outputs become high impedance. During
mute operation, the protection circuit operation is disabled, but the outputs are protected against output short
circuits by their high impedance state. When power is applied, MUTEN should be held LOW for a short inter-
val, shown in the timing diagram below, to prevent pop noise from the speaker. Also, applying and releasing
mute operation after power is applied can occur at high speed without generating pop noise.
Note. VREF1 load capacitance = 1
µF
Protection Circuit
The protection circuit operates if there is an output short-circuit to the supply, short-circuit to ground, or other
excessive load abnormal condition lasting longer than approximately 1
µs. Normal operation resumes after
approximately 5 seconds. When the protection circuit becomes active, the outputs become high impedance.
The usage with direct coupling to load is recommended for operating VDD1, VDD2, VDD3 and VDD4 at
≤ 2.4V. When using LC-type LPF, the ringing phenomena due to rush current may be judged as short-circuit of
the load. In this case, the normal operation will start after the mute for 5 seconds.
PDWN
min. 40msec
MUTEN


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