TC2001 Ver la hoja de datos (PDF) - Tripath Technology Inc.

Número de pieza

componentes Descripción

Fabricante

TC2001

STEREO 200W (6Ω) CLASS-T DIGITAL AUDIO AMPLIFIER DRIVER USING DIGITAL POWER PROCESSINGtm TECHNOLOGY

Tripath Technology Inc. 

RVPP1

RVPP2

RS

ROCR

COCR

CHBR

RG

DG

CZ

RZ

LO

CO

11

Tripath Technology, Inc. - Technical Information

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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 fC = 1 (2 π L O C O ) and a quality factor of Q = R L C O L O C O .

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 fC = 1 (2 π L O C O ) and a quality factor of Q = R L C O L O C O . Use

a high quality film capacitor capable of sustaining the ripple current caused by the

switching outputs.

TK2150 – Rev. 1.0/12.02

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