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TC2001 Scheda tecnica(PDF) 11 Page - Tripath Technology Inc. |
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TC2001 Scheda tecnica(HTML) 11 Page - Tripath Technology Inc. |
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11 / 34 page  Tr i p ath Technol ogy, I n c. - Techni cal I n for m ati on 11 TK2150 – Rev. 1.0/12.02 resistor value should be three times that of RVNN1. 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. RVPP1 Main overvoltage and undervoltage sense resistor for the positive supply (VPP). 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 (VPP). 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. RS Over-current sense resistor. Please refer to the section, Setting the Over-current Threshold, in the Application Information for a discussion of how to choose the value of RS to obtain a specific current limit trip point. ROCR Over-current “trim” resistor, which, in conjunction with RS, sets the current trip point. Please refer to the section, Setting the Over-current Threshold, in the Application Information for a discussion of how to calculate the value of ROCR. COCR Over-current filter capacitor, which filters the overcurrent signal at the OCR pins to account for the half-wave rectified current sense circuit internal to the TC2001. A typical value for this component is 220pF. In addition, this component should be located near pin 14 or pin 16 of the TC2001 as possible. CHBR Supply decoupling for the high current Half-bridge supply pins. These components must be located as close to the output MOSFETs as possible to minimize output ringing which causes power supply overshoot. By reducing overshoot, these capacitors maximize both the TP2150 and output MOSFET reliability. These capacitors should have good high frequency performance including low ESR and low ESL. In addition, the capacitor rating must be twice the maximum VPP voltage. Panasonic EB capacitors are ideal for the bulk storage (nominally 33uF) due to their high ripple current and high frequency design. RG Gate resistor, which is used to control the MOSFET rise/ fall times. This resistor serves to dampen the parasitics at the MOSFET gates, which, in turn, minimizes ringing and output overshoots. The typical power rating is 1/2 watt. DG Gate diode, placed in parallel to the gate resistor. This diode will help discharge the parasitic capacitance at the MOSFET gates, thus increasing the MOSFET fall time. This help reduce shoot through current between the top side and bottom side output MOSFETs. This should be a schottky or ultrafast rectifier. This part may not be needed depending on the type of output MOSFET used. CZ Zobel capacitor, which in conjunction with RZ, terminates the output filter at high frequencies. Use a high quality film capacitor capable of sustaining the ripple current caused by the switching outputs. RZ Zobel resistor, which in conjunction with CZ, terminates the output filter at high frequencies. The combination of RZ and CZ minimizes peaking of the output filter under both no load conditions or with real world loads, including loudspeakers which usually exhibit a rising impedance with increasing frequency. Depending on the program material, the power rating of RZ may need to be adjusted. The typical power rating is 2 watts. LO Output inductor, which in conjunction with CO, demodulates (filters) the switching waveform into an audio signal. Forms a second order filter with a cutoff frequency of ) C L 2 ( 1 f O O C π = and a quality factor of O O O L C L C R Q = . CO Output capacitor, which, in conjunction with LO, demodulates (filters) the switching waveform into an audio signal. Forms a second order low-pass filter with a cutoff frequency of ) C L 2 ( 1 f O O C π = and a quality factor of O O O L C L C R Q = . Use a high quality film capacitor capable of sustaining the ripple current caused by the switching outputs. |
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