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TC2001 Datasheet(PDF) 27 Page - Tripath Technology Inc. |
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TC2001 Datasheet(HTML) 27 Page - Tripath Technology Inc. |
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27 / 34 page  Tr i p ath Technol ogy, I n c. - Techni cal In fo rma t io n 27 TK2150 – Rev. 1.0/12.02 THD+N versus Frequency versus Gate Resistance 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 20 20k 50 100 200 500 1k 2k 5k 10k Hz R L = 6Ω Pout = 25W /Channel FET's = FQP13N10 f = 1kHz BBM = 40nS V S = + 40V BW = 22Hz - 22kHz R G = 22 Ω R G = 33 Ω R G = 46.4 Ω THD+N versus Frequency versus Gate Resistance 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 20 20k 50 100 200 500 1k 2k 5k 10k Hz R L = 8Ω Pout = 20W /Channel FET's = FQP13N10 f = 1kHz BBM = 40nS V S = +40V BW = 22Hz - 22kHz R G = 22 Ω R G = 33 Ω R G = 46.4 Ω 6 ohm and 8 ohm plots of THD+N versus Frequency for various gate resistor values 6 ohms 8 ohms 22 ohms 18mA 18mA 33 ohms 20mA 20mA 46.4 ohms 80mA 80mA Table 2: Idle current draw for VPP with various gate resistor values Application Information – Recommended MOSFETs Part Number Recommended Max Supply Voltage Typical Load at Maximum Supply Recommended Gate Resistor Other applications IRF520N +/-45V 8 ohm SE 22 ohms Only for 8 ohm SE Loads FQP13N10 +/-45V 6 ohm SE 33 ohms 6 ohm BR at +/25V 8 ohm BR at +/-33V STP14NF10 +/-45V 6 ohm SE 33 ohms 6 ohm BR at +/-25V 8 ohm BR at +/-33V IRF530N +/-45V 4 ohm SE / 8 ohm BR 15 ohms 6 ohm BR at +/-33V BUK7575-100A +/-45V 4 ohm SE / 6 ohm BR 15 ohms 4 ohm BR at +/-33V STP24NF10 +/-45V 4 ohm SE / 6 ohm BR 10 ohms 4 ohm BR at +/-35V SE stands for Single Ended Outputs and BR stands for Bridged Output MOSFETs Under Evaluation The following MOSFETs appear to be suitable for use with the TK2150, and we are waiting for samples to evaluate. Most of these devices come from the same “family” or generation, as other recommended MOSFETs. However, experience tells us that we cannot recommend any devices until we have received samples and fully tested them. Device Information – MOSFETs Under Evaluation Part Number Manufacturer BVDSS (V) ID (A) Qg (nC) RDS(on) (Ω) PD (W) Package FQP14N15 Fairchild Semiconductor 150 14.4 18 .164 104 T0220 FQP16N15 Fairchild Semiconductor 150 16.4 23 0.123 108 TO220 FDP2572 Fairchild Semiconductor 150 29 27 0.045 135 TO247 FDP3682 Fairchild Semiconductor 100 32 18.5 0.032 95 TO220 Note: The devices are listed in ascending current capability not in order of recommendation. Output Filter Design One advantage of Tripath amplifiers over PWM solutions is the ability to use higher-cutoff- frequency filters. This means load-dependent peaking/droop in the 20kHz audio band potentially caused by the filter can be made negligible. This is especially important for applications where the user may select a 6-Ohm or 8-Ohm speaker. Furthermore, speakers are not purely resistive |
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