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YDA135 View Datasheet(PDF) - Yamaha Corporation

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YDA135 Datasheet PDF : 22 Pages
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YDA135
CDIL, CDOL, CDIR, CDOR (Pin No.41, 42, 20, 19)
CDIL and CDOL are for connecting a resistor and a capacitor for setting off time of external Power MOSFET for left
channel (refer to "Amplifier functions").
CDIR and CDOR are for connecting a resistor and a capacitor for setting off time of external Power MOSFET for
right channel.
It is necessary to determine the resistor and capacitor to obtain a time constant according the characteristics of
Power MOSFET that is to be used and distortion rate of amplifier you need. Refer to "Amplifier functions".
SENSEPL, SENSENL, SENSEPR, SENSENR (Pin No.39, 37, 22, 24)
SENSEPL and SENSENL are the overcurrent detection terminals for left channel.
SENSEPR and SENSENR are the overcurrent detection terminals for right channel.
As described in the "Example of application circuit", connect an end of the current detection resistor to power supply
side and ground side of Power MOSFET, and connect other end of the resistor to SENSEPL and SENSENL
terminals, and SENSEPR and SENSENR terminals respectively.
This IC determines that overcurrent state has occurred when the voltage drop at the current detection resistor
becomes specified values (VOCPN and VDDP-VOCPP) or over.
It is necessary to determine the resistance of the current detection resistor optimally according to the characteristics
of Power MOSFET.
When the overcurrent detection circuitry of left channel or right channel determines overcurrent state, "H" level is
outputted from the warning signal output (PROT) terminal.
When the warning signal is outputted due to overcurrent detection, this IC keeps the warning signal output
(PROT="H" level) after the current return to normal state.
TPP (Pin No.8)
TPP is the high temperature detection terminal.
As described in the "Example of application circuit", connect a temperature detection element (such as a posistor)
between TPP terminal and 5 V system ground terminal. In addition, connect a resistor with proper value between
TPP terminal and 5V system power supply terminal. At this time, arranges the temperature detection near Power
MOSFET. As the temperature of Power MOSFET rises, the resistor value of the temperature detection element
increases, and the voltage of TPP terminal also increases accordingly. This IC determines that high temperature
state has occurred when the voltage of TPP terminal has become specified value (VTPP) or over, and outputs "H"
level from the warning signal output (PROT) terminal.
When the warning signal is outputted due to high temperature detection, this IC keeps the warning signal output
(PROT="H" level) after the temperature return to normal state.
Digital terminals
SLEEP (Pin No.5)
SLEEP is the sleep control terminal. It controls both left and right channels simultaneously.
When SLEEP terminal is set at "H" level, all functions of this IC is stopped, and this IC is placed in the sleep state.
At this time, all Power MOSFET driving terminals output signals that turn off the Power MOSFETs.
Though all Power MOSFETs are placed in the off state (non conductive state), the speaker terminal is made ground
potential by the externally connected resistor.
At this time, restrain the power consumption at the minimum, and warning signal (PROT terminal output) is set at
"L" level.When SLEEP terminal is changed from "H" level to "L" level, this IC goes into normal operation after
sufficient time (starting time) to make each reference voltage reaches a fixed potential.
MUTE (Pin No.4)
MUTE is the mute control terminal. It controls both left and right channels simultaneously.
When MUTE terminal is set at "H" level, all Power MOSFET driving terminals output signals that turns off the Power
MOSFETs. Though all Power MOSFETs are placed in the off state (non conductive state), the speaker terminal is
made ground potential by the externally connected resistor, and the amplifier becomes mute state. At this time, the
overcurrent protection function stops.
When MUTE terminal is set to "L" level, this IC goes into normal operating state.
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