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TK2350 Datasheet(PDF) 26 Page - Tripath Technology Inc. |
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TK2350 Datasheet(HTML) 26 Page - Tripath Technology Inc. |
26 / 36 page Tr i p ath Technol ogy, I n c. - Techni cal I n for m ati on 26 of 26 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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