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參數資料
| 型號： | IRAUDAMP5 |
| 廠商： | International Rectifier |
| 英文描述： | 120W x 2 Channel Class D Audio Power Amplifier Using the IRS2092S and IRF6645 |
| 中文描述： | 120瓦× 2通道D類音頻功率放大器使用IRS2092S和IRF6645 |
| 文件頁數： | 17/49頁 |
| 文件大?。?/td> | 1416K |
| 代理商： | IRAUDAMP5 |
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will pump the bus symmetrically in voltage level over a complete audio frequency cycle), it is
sufficient to sense only one of the two supply voltages for OVP.
It is therefore up to the user to
ensure that the power supplies are symmetrical.
Q109 Over-Voltage Protection (OVP)
R141
47k
S1
SW-PB
Q109
MMBT5551
R139
47k
D105
1N4148
Z107
18V
R145
47K
R146
47K
Q110
MMBT5551
R144
10k
Trip and restart
R140
10k
Z105
39V
OVP
R149
47K
C119
0.1uF, 50V
UVP
Q110 Under-Voltage Protection (UVP)
Fig 18
-B
S
DCP
OT
OT
Under-Voltage Protection (UVP,
Fig18
)
UVP will shutdown the amplifier if the bus voltage between GND and -B falls below 20V. The
threshold is determined by the voltage sum of the Zener diode Z107, R145 and V
BE
of Q110. As
with OVP, UVP will automatically reset after three seconds, and only one of the two supply
voltages needs to be monitored.
Speaker DC-Voltage Protection (DCP,
Fig 19
)
DCP is provided to protect against DC current flowing into the speakers. This abnormal condition
is rare and is likely caused when the power amplifier fails and one of the high-side or low-side
IRF6645 DirectFET MOSFETs remain in the ON state. DCP is activated if either of the outputs
has more than ±4V DC offset (typical). Under this fault condition, it is normally required to
shutdown the feeding power supplies. Since these are external to the reference design board, an
isolated relay P1 is provided for further systematic evaluation of DC-voltage protection. This
condition is transmitted to the power supply controller through connector J9, whose pins are
shorted during a fault condition.
www.irf.com
Page 16 of 49
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