YDA135 Datasheet, PDF (1/22 Pages) YAMAHA CORPORATION – STEREO 5W-20W DIGITAL AUDIO POWER AMPLIFIER CONTROLLER

YDA135
D-20
STEREO 5W-20W DIGITAL AUDIO POWER AMPLIFIER CONTROLLER
Outline
YDA135 is digital audio power amplifier controller IC that is output power of 20W/channel on a 12V power supply
operation.
This IC is combined with the general purpose Power MOSFET (hereafter called Power MOSFET) that are
connected through BTL can configure an audio power amplifier with output power of 5W or 20W.
This IC accepts analog signal, converts it into digital pulse signal by the digital modulation circuitry and outputs
the digital pulse signal for driving Power MOSFET. The Power MOSFET that is driven by this IC outputs large
current digital pulses. The digital pulse signal is converted to audio signal through an external low pass filter, and
sent to the speakers.
By using a general purpose Power MOSFET, very low cost digital amplifier system is configured. By adapting
Yamaha's proprietary modulation system, the device provides low distortion and high signal to noise ratio at the
highest level among digital amplifiers in the equiralent class.
This IC has the overcurrent detection function that detects overcurrent state by voltage drop of external resistors
that detects the output current.
This IC has the high temperature detection function that detects high temperature by resistor value change of
external element that detects temperature.
The operation of this IC is limited by using two control signal, SLEEP or MUTE. SLEEP signal stops all functions
of this IC, and restrain to the power consumption at the minimum. MUTE signal brings Power MOSFET into
nonconductive state, and mute the output of the device.
This IC is configured by two power supply ; 5V for signal processing circuits, and 12V for Power MOSFET driving
circuits.
Features
・High output power
　　20W ＠ VDDP=12.0V RL=4Ω THD+N<10%
・High efficiency operation
　　80 % ＠ VDDP=12.0V RL=4Ω Po=20W
　　85 % ＠ VDDP=12.0V RL=8Ω Po=10W
・Low distortion(THD+N)
　　0.03 % ＠ 1kHz RL=4Ω Po=7W
・High signal to noise ratio
　　100 dB ＠ VDDP=12.0V Input sensitivity1.0V RL=4Ω
　　97 dB ＠ VDDP=12.0V Input sensitivity150mV RL=4Ω
・Low consumption current (12V/5V power supply)
When Power MOSFET (FW332) is connected.
　　30mA /7mA ＠ VDDP=12.0V no signal
　　0.1mA/7mA ＠ VDDP=12.0V at mute
　　 1μA/1μA ＠ VDDP=12.0V at sleep
・CS(Channel separation)
　　80 dB ＠ 1kHz
・Any gain setting by external resistors
・Sleep function by SLEEP terminal
・Output mute function by MUTE terminal
・Over current detection function
(Power supply short-circuiting, Ground short-
circuiting, Load short-circuiting)
・High temperature detection function
・Pop noise suppression function at turn-on and
turn-off
・48-pin plastic LQFP (YDA135-VZ)
YDA135CATALOG
CATALOG No.:LSI-4DA135A2
2003.3