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参数资料
| 型号： | YDA147 |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封装： | LEAD FREE, PLASTIC, SQFP-48 |
| 文件页数： | 13/36页 |
| 文件大小： | 1264K |
| 代理商： | YDA147 |
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YDA147
20
CATALOG No.:LSI-4DA147A61
·Digital Amplifier Over current Protection Function
This is the function to protect the device by detecting short-circuiting (to the supply voltage, to the ground, and between
terminals) at digital amplifier output terminals.
In the protection mode, PROTN terminal becomes L level and output terminals become Weak Low state (a state
grounded through a high resistance).
The protection mode can be cancelled by turning off the power supply or inputting an L level signal to SLEEPN terminal
momentarily.
And, when PROTN terminal is externally connected to SLEEPN terminal, automatic return mode is selected. At this time,
the protection mode is cancelled even if the protection mode is established by detecting an overcurrent state, and PROTN
terminal output is turned from L level into Hi-Z state and a normal operation state is given after a given standby time
(tWU). (Automatic Return Function)
The current value to detect a short-circuiting between terminals is 8A (typ,VDDP=12V), 10A (typ,VDDP=15V).
·High Temperature Protection Function
This is the function to protect the device by detecting an unusual temperature in YDA147.
The protection mode operates in the following two modes according to the temperature.
1) High Temperature Power Limiter State
If the temperature rises and reaches 155°C (typ.), the high temperature power limiter state is given. This state
decreases the power limit level by 6dB in order to limit the digital amplifier output power, and attempts to lower the
temperature.
In this way, when the temperature falls and lowers than 130°C (typ.), the high temperature power limiter state is
automatically cancelled and the gain is restored to the original setting value.
In the power limiter state, this does not affect on PROTN terminal.
2) High Temperature Shutdown State
If the temperature rises and reaches 165°C (typ.) during the high temperature power limiter state, the high temperature
cutoff state is given. This state outputs an L level signal from PROTN terminal and digital amplifier output terminals
become Weak Low state (a state grounded through a high resistance).
In this way, when the temperature goes down and lowers than 130°C (typ.), the high temperature shutdown state is
automatically cancelled.
And, even if the cutoff state is established by detecting an unusual temperature, when PROTN terminal is externally
connected to SLEEPN terminal, the cutoff state is cancelled and PROTN terminal output is turned from L into Hi-Z
state and a normal operation state is given if the temperature is sufficiently lowered after a given standby time (tWU).
(Automatic Return Function)
If the temperature is not sufficiently lowered, the high temperature protection mode will be established.
·Low Voltage Malfunction Prevention Function
This is the function to protect the device when the supply voltage at PVDDREG terminal is unusually lowered.
In this protection mode, the digital amplifier output terminals become Weak Low state (a state grounded through a high
resistance).
This protection mode is given if the supply voltage at PVDDREG terminal becomes a voltage lower than PVDD
shutdown threshold voltage (VHUVLL).
When the supply voltage at PVDDREG terminal exceeds PVDD startup threshold voltage (VHUVLH), the protection mode
is cancelled and a normal operation mode is given after a given standby time (tWU). (Automatic Return Function)
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