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參數(shù)資料
| 型號(hào)： | TK2150 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | STEREO 200W CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSING TECHNOLOGY |
| 中文描述： | 類立體聲功率200W - T的數(shù)字音頻放大器驅(qū)動(dòng)程序使用數(shù)字功率處理技術(shù) |
| 文件頁數(shù)： | 22/34頁 |
| 文件大?。?/td> | 663K |
| 代理商： | TK2150 |
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Tripath Technology, Inc. - Technical Information
22
TK2150 – Rev. 1.0/12.02
R
S
and R
OCR
are in
V
TOC
= Over-current sense threshold voltage (See Electrical Characteristics Table)
= 1.0V typically
I
BIAS
= 20uA
For example, to set an I
SC
of 7A, R
OCR
= 30.1k
and R
S
will be 10m
.
As high-wattage resistors are usually only available in a few low-resistance values (10m
, 25m
and 50m
), R
OCR
can be used to adjust for a particular over-current threshold using one of these
values for R
S
.
It should be noted that the addition of the bulk C
HBR
capacitor shown in the Application / Test
Diagram will increase the I
SC
level. Thus, it will be larger than the theoretical value shown above.
Once the designer has settled on a layout and specific C
HBR
value, the system I
SC
trip point can
be adjusted by increasing the R
OCR
value. The R
OCR
should be increased to a level that allows
expected range of loads to be driven well into clipping without current limiting while still protecting
the output MOSFETs in case of a short circuit condition.
Auto Recovery Circuit for Overcurrent Fault Condition
If an overcurrent fault condition occurs the HMUTE pin (pin 8 of the TC2001) will be latched high
and the amplifier will be muted. The amplifier will remain muted until the MUTE pin (pin 24 of the
TC2001) is toggled high and then low or the power supplies are turned off and then on again.
The circuit shown below in Figure 4 is a circuit that will detect if HMUTE is high and then toggle
the mute pin high and then low, thus resetting the amplifier. The LED, D1 will turn on when
HMUTE is high. The reset time has been set for approximately 2.5 seconds. The duration of the
reset time is controlled by the RC time constant set by R306 and C311. To increase the reset,
time increase the value of C311. To reduce the reset time, reduce the value of C311. Please
note that this circuit is optional and is not included on the RB-TK2150 evaluation boards.
R311
1k
, 5%
R307
10k
, 5%
R308
10k
, 5%
R311
1k
, 5%
R306
510k
, 5%
R309
1k
, 5%
R310
1k
, 5%
C311
10uF, NP
Q303
2N7002
R311
1k
, 5%
D1
LED
Q302
2N3904
Q304
2N3904
Q305
2N3906
HMUTE
Pin 8
MUTE
Pin 24
V5
AGND
Jumper
remove jumper to
enable mute
Figure 4: Overcurrent Autorecovery Circuit
Over- and Under-Voltage Protection
The TC2001 senses the power rails through external resistor networks connected to VNNSENSE
and VPPSENSE. The over- and under-voltage limits are determined by the values of the resistors
in the networks, as described in the table “Test/Application Circuit Component Values”. If the
supply voltage falls outside the upper and lower limits determined by the resistor networks, the
TC2001 shuts off the output stages of the amplifiers. The removal of the over-voltage or under-
voltage condition returns the TK2150 to normal operation. Please note that trip points specified in
the Electrical Characteristics table are at 25
°
C and may change over temperature.
The TC2001 has built-in over and under voltage protection for both the VPP and VNN supply
rails. The nominal operating voltage will typically be chosen as the supply “center point.” This
allows the supply voltage to fluctuate, both above and below, the nominal supply voltage.
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