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參數(shù)資料
| 型號(hào)： | TC2001 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | 連接器附件 |
| 文件頁數(shù)： | 23/34頁 |
| 文件大?。?/td> | 663K |
| 代理商： | TC2001 |
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Tripath Technology, Inc. - Technical Information
23
TK2150 – Rev. 1.0/12.02
VPPSENSE (pin 19) performs the over and undervoltage sensing for the positive supply, VPP.
VNNSENSE (pin 17) performs the same function for the negative rail, VNN. When the current
through R
VPPSENSE
(or R
VNNSENSE
) goes below or above the values shown in the Electrical
Characteristics section (caused by changing the power supply voltage), the TK2150 will be
muted. VPPSENSE is internally biased at 2.5V and VNNSENSE is biased at 1.25V.
Once the supply comes back into the supply voltage operating range (as defined by the supply
sense resistors), the TK2150 will automatically be unmuted and will begin to amplify. There is a
hysteresis range on both the VPPSENSE and VNNSENSE pins. If the amplifier is powered up in
the hysteresis band the TK2150 will be muted. Thus, the usable supply range is the difference
between the over-voltage turn-off and under-voltage turn-off for both the VPP and VNN supplies.
It should be noted that there is a timer of approximately 200mS with respect to the over and
under voltage sensing circuit. Thus, the supply voltage must be outside of the user defined
supply range for greater than 200mS for the TK2150 to be muted.
Figure 5 shows the proper connection for the Over / Under voltage sense circuit for both the
VPPSENSE and VNNSENSE pins.
VNN
V5
R
VPP1
19
17
R
VNN1
R
VPP1
R
VNN2
VPPSENSE
VNNSENSE
VPP
V5
TC2001
Figure 5: Over / Under voltage sense circuit
The equation for calculating R
VPP1
is as follows:
VPP
R
=
VPPSENSE
VPP1
I
Set
VPP1
VPP2
R
R
=
.
The equation for calculating R
VNNSENSE
is as follows:
VNN
R
=
VNNSENSE
VNN1
I
Set
VNN1
VNN2
R
3
R
×
=
.
I
VPPSENSE
or I
VNNSENSE
can be any of the currents shown in the Electrical Characteristics
table for VPPSENSE and VNNSENSE, respectively.
The two resistors, R
VPP2
and R
VNN2
compensate for the internal bias points. Thus, R
VPP1
and
R
VNN1
can be used for the direct calculation of the actual VPP and VNN trip voltages without
considering the effect of R
VPP2
and R
VNN2
.
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