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TK2019 Datasheet(PDF) 9 Page - Tripath Technology Inc. |
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TK2019 Datasheet(HTML) 9 Page - Tripath Technology Inc. |
9 / 21 page Tr i p ath Technol ogy, I n c. - Techni cal I n for m ati on 9 TK2019 – MC/2.1/10-03 CB Bypass capacitor for the internal regulator that powers the gate drive circuitry. DS MOSFET protection diode. This diode absorbs any high frequency overshoots or undershoots caused by the output inductor LO during high output current conditions. In order for this diode to be effective it must be connected directly to the drain of the topside MOSFET (pin 2) and the output (pin 3) and source of bottom side MOSFET (pin 4) and the output (pin 3). An ultra fast recovery diode that can sustain the entire VCC voltage should be used here. Thus a 50V or greater diode must be used. RVPP1 Overvoltage and undervoltage sense resistor for the positive supply (VDD). Please refer to the Electrical Characteristics Section for the trip points as well as the hysteresis band. Also, please refer to the Over / Under-voltage Protection section in the Application Information for a detailed discussion of the internal circuit operation and external component selection. RVPP2 Secondary overvoltage and undervoltage sense resistor for the positive supply (VDD). This resistor accounts for the internal VPPSENSE bias of 2.5V. Nominal resistor value should be equal to that of RVPP1. Please refer to the Over / Under- voltage Protection section in the Application Information for a detailed discussion of the internal circuit operation and external component selection. RVNN Not used on TK2019. Connect this pin to AGND through a 10k Ω resistor. CA BIASCAP decoupling capacitor. Should be located close to pin 1 of the TC2001 and grounded at pin 20 of the TC2001. RHMUTE Base resistor to limit the current output from the HMUTE pin. DCH Diode to keep the Bypass pin (pin 7) of the TPS1035 charged to 5V while HMUTE is high. This diode should be a Schottky diode. Q1 PNP transistor to keep the Bypass pin (pin 7) of the TPS1035 charged to 5V whenever the HMUTE is high. Q2 PNP transistor to keep HMUTE high and mute the amplifier if the 5V supply is turned off before the 24V supply. If the amplifier is not muted and the 5V supply is turned off before the 24V supply, the amplifier will have an audible pop. RBASE Base resistor for limiting the current entering the base for Q2. RC Pull down resistor to pull the collector of Q2 to ground if both the 5V supply and the 24V supply is on and Q2 is off. ROFF Resistor that limits the current from the 24V supply going into the 5.1V zener diode (DZ). DP Diode in series with the collector of Q2 to pull HMUTE high if the 5V supply is turned off before the 24V supply. DZ 5.1V zener diode to keep the emitter of Q2 to 5.1V so that when Q2 is on the HMUTE pin will not exceed 5V. RBIAS1 Bias resistor to bias the FBKGND pins (pins 2 and 8 on TC2001) to 2.5V. Typically used value is 4.64k Ω. RBIAS2 Second bias resistor to bias the FBKGND pins (pins 2 and 8 on TC2001) to 2.5V. The value of RBIAS2 when placed in parallel with RFBB and RFBC should have equivalent resistance to RBIAS1. Please see the Modulator Feedback Design paragraphs in the Application Information Section. An equivalent equation would be RBIAS1 = 1/ (RFBB + RFBC) + 1/ RBIAS2 . RD Resistor to limit the current flowing into diode DC. DC Diode to connect the VBOOT pin (pin 5 of the TPS1035) to the 24V supply so that the VBOOT pin is charged up while the TPS1035 is muted. This helps prevent clicks and pops while the sleep is disabled on the TPS1035. DBOOT2 Protection diode for the VBOOT pin (pin 5 of the TPS1035) so that the VBOOT pin will never exceed 6.2V. ROUT1 Bias resistor to keep the output capacitor COUT charged to VDD/2. Typically used value is 8.45k Ω. ROUT2 Bias resistor used in conjunction with ROUT1 to keep the output capacitor COUT charged to VDD/2. Typically used value is 20k Ω. RB For proper operation of the TPS1035, the Fault pin (pin 8) must be connected to the Bypass pin (pin 7) through a 27kohm resistor. COUT Output capacitor in series with the output to block DC current to flow to the output load. This capacitor will form a high pass filter with output load with a cutoff frequency at ) C R 2 ( 1 f I I C π = . Where R is the resistive value of the output load. |
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