YDA131-EZ View Datasheet(PDF) - Yamaha Corporation
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YDA131-EZ Datasheet PDF : 18 Pages
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YDA131
When this IC is used with application that speaker terminal is likely to short-circuit during operation, use the following
over current detection and protection circuit.
(1) Connecting PROT terminal output to MUTE terminal.
When an overcurrent is detected, the output goes into mute state. In this case, warning signal output and mute state
cannot be cancelled unless otherwise the power supply is turned on again or the state of SLEEP terminal is changed
as "L" level, "H" level and "L" level in this order.
(2) Attaching a fall delay circuit to PROT terminal, and connecting it to SLEEP terminal.
For the connection, refer to "Figure 4: PROT terminal output connection circuit example" in the following
"Restrictions" section.
When overcurrent is detected, this IC goes into sleep state, and the output goes into mute state, and warning signal
output is cancelled. The sleep state is cancelled after the elapse of the fall delay time, and return to normal operation.
If the overcurrent state remains even after the restart, the sleep and start are repeated.
(3) If the current capacity of used power supply exceeds 1.5A, connect shottkey-diode between output terminals (OUTPL,
OUTML, OUTPR, OUTMR) and VSS, and connect between PROT and MUTE terminal or SLEEP terminal as (1),
(2).
・High temperature detection function
When this IC operates with its internal temperature exceeding the maximum rating (junction temperature), it determines
itself as a high temperature state, and outputs the warning signal (PROT terminal ="H" level).
When a warning is signaled, MUTE terminal or SLEEP terminal should be controlled externally to place this IC in muted
state or sleep state immediately to protect this IC. If the internal overheating is due to the overload output, the temperature
rise is avoided by aforesaid control.
When the warning signal is generated due to the high temperature detection, and then, the temperature is reduced
sufficiently by the protection action with the control of MUTE terminal or SLEEP terminal, this IC cancels the warning
signal. The warning signal is also cancelled by setting the state of SLEEP terminal at "L" level or by turning on the power
supply again.
The control through the use of PROT terminal, MUTE terminal or SLEEP terminal is made also for the case of high
temperature detection like the case of the overcurrent detection.
In case of high temperature detection, this IC cancels the warning signal if the temperature is reduced sufficiently.
Thus, this IC can return to the normal operation even if PROT terminal and MUTE terminal are connected.
・Restrictions
A pulse as short as about 1µs may be outputted from PROT terminal when the power supply is turned on or the state of
SLEEP terminal is changed from "H" level to "L" level.
When this IC is controlled using SLEEP terminal and PROT terminal, connect an LPF (low pass filter) that can cut pulse
about 10µs to PROT terminal.
"Figure 4: PROT terminal output connection circuit example" is the connection circuit example for the case LPF (low pass
filter) and fall delay circuit are attached to PROT terminal and connected to SLEEP terminal.
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