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| TCA2002 Datasheet, PDF (16/18 Pages) Tripath Technology Inc. – STEREO CLASS-T™ AUDIO CONTROLLER USING DIGITAL POWER PROCESSING (DPP™) TECHNOLOGY | |||
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Tripath Technology, Inc. - Technical Information
V5
RVNN2
V5
RVPP2
VNN
TCA2002
RVNN1
17 VNNSENSE
VPP
RVPP1
19
VPPSENSE
Figure 6: Over / Under voltage sense circuit
The equation for calculating RVPP1 is as follows:
R VPP1 = VPP
I VPPSENSE
Set R VPP2 = R VPP1 .
The equation for calculating RVNNSENSE is as follows:
R VNN1 = VNN
IVNNSENSE
Set R VNN2 = 3 Ã R VNN1 .
IVPPSENSE or IVNNSENSE can be any of the currents shown in the Electrical Characteristics table
for VPPSENSE and VNNSENSE, respectively.
The two resistors, RVPP2 and RVNN2 compensate for the internal bias points. Thus, RVPP1 and RVNN1
can be used for the direct calculation of the actual VPP and VNN trip voltages without considering the
effect of RVPP2 and RVNN2.
Using the resistor values from above, the actual minimum over voltage turn off points will be:
VPP = R Ã I MIN_OV_TUR N_OFF
VPP1 VPPSENSE (MIN_OV_TU RN_OFF)
VNN = â(R Ã I ) MIN_OV_TUR N_OFF
VNN1 VNNSENSE (MIN_OV_TU RN_OFF)
The other three trip points can be calculated using the same formula but inserting the appropriate
IVPPSENSE (or IVNNSENSE) current value. As stated earlier, the usable supply range is the difference
between the minimum overvoltage turn off and maximum under voltage turn-off for both the VPP and
VNN supplies.
VPP RANGE = VPP MIN_OV_TUR N_OFF - VPP MAX_UV_TUR N_OFF
VNN RANGE = VNN MIN_OV_TUR N_OFF - VNN MAX_UV_TUR N_OFF
16
TCA2002 â KLi/0.95/04.06
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