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TK2350 Datasheet(PDF) 26 Page - Tripath Technology Inc.

Part # TK2350
Description  STEREO 300W (4 OHM ) CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSINGTM TECHNOLOGY
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Manufacturer  TRIPATH [Tripath Technology Inc.]
Direct Link  http://www.etelos.com/
Logo TRIPATH - Tripath Technology Inc.

TK2350 Datasheet(HTML) 26 Page - Tripath Technology Inc.

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Tr i p ath Technol ogy, I n c. - Techni cal I n for m ati on
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TK2350, Rev 1.5/09.03
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 TK2350 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.
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 RVPPSENSE (or RVNNSENSE) goes below or above the values shown in the Electrical
Characteristics section (caused by changing the power supply voltage), the TK2350 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 TK2350 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 TK2350 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 TK2350 to be muted.
Figure 5 shows the proper connection for the Over / Under voltage sense circuit for both the
VPPSENSE and VNNSENSE pins.
R
VPP2
VNN
19
17
R
VNN1
R
VPP1
V5
R
VNN2
VPPSENSE
VNNSENSE
VPP
V5
TC2001
Figure 5: Over / Under voltage sense circuit
The equation for calculating RVPP1 is as follows:
VPPSENSE
VPP1
I
VPP
R
=
Set
VPP1
VPP2
R
R
=
.


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