TDF8599ATH/N2,512

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1. Describe

The TDF8599ATH/N2,512 is a dual bridge-tied load (BTL) automotive audio amplifier that includes an NDMOST-NDMOST output stage based on SOI BCDMOS technology. Low power consumption enables the TDF8599A high-efficiency class-D amplifier to use a smaller heatsink than is typically used with standard class-AB amplifiers. The TDF8599A can operate in non-I2C bus mode or in I2C bus mode. In I2C bus mode, the DC load detection results and fault conditions can be easily read from the device. Depending on the value of the external resistors connected to pins ADS and MOD, up to 15 I2C bus addresses can be selected. When pin ADS is shorted to ground, the TDF8599A operates in non-I2C bus mode. Switching between operating mode and mute mode in non-I2C-bus mode can only be done using pins EN and SEL_MUTE.

2. Features

    1. High efficiency

    2. Low quiescent current

    3. Operating voltage from 8 V to 35 V

    4. Two 4 Ω/2 Ω capable BTL channels or one 1  capable BTL channel

    5. Differential input

    6. I2C bus mode or non-I2C bus mode operation with 15 I2C bus addresses

    7. Clip detection

    8. Independent short circuit protection for each channel

    9. Advanced load, ground and power short-circuit protection

  10. Load dump protection

  11. Thermal Foldback and Thermal Protection

  12. DC offset protection

  13. Selectable AD or BD modulation

  14. Parallel channel mode with high current drive capability

  15. Advanced Clock:

        - Switchable oscillator clock source: internal for master mode or external for slave mode

        - Spread Spectrum Mode

        - Phase stagger

        - Frequency hopping

  16. No "pop" caused by DC output offset voltage

  17. I2C bus mode:

        - DC load detection

        - AC load detection

        - Thermal warning diagnostic level setting

        - Identify active protection or warning

        - Optional diagnostic information available using pins DIAG and CLIP

  18. Compliant with AEC-Q100

3. Application

    1. Car audio

4. Pin configuration

5. Function Description

    1. General

        The TDF8599A is a dual full bridge (BTL) audio power amplifier using Class D technology. Converts audio input signals to pulse width modulated (PWM) signals using analog inputs and a PWM control stage. A PWM signal is applied to the drive circuit High-side and low-side enable DMOS power output transistors to be driven. An external second-order low-pass filter converts the PWM signal to an analog audio signal on the speaker. The TDF8599A includes integrated common circuits for all channels, such as oscillators, all reference sources, mode functions, and a digital timing manager. Additionally, built-in protections include thermal foldback, temperature, overcurrent, and overvoltage (load dump). The TDF8599A operates in I2C bus mode or non-I2C bus mode. In I2C bus mode, DC load detection, frequency hopping and extended configuration functions are provided, as well as enhanced diagnostic information.

    2. Mode selection

        Mode pins EN, ADS, and SEL_MUTE enable mute state, I2C bus mode and operating mode switching. Pin SEL_MUTE is used to mute and unmute the device and must be connected to an external capacitor (CON). This capacitor produces a time constant that ensures a smooth fade in and fade out of the input signal. The TDF8599A is enabled when EN is high. When the EN pin is low, the TDF8599A is turned off and the supply current is at its lowest value (typically 2 μA). When turned off, the TDF8599A is completely disabled and will not react to I2C bus commands. The I2C bus mode is selected by connecting a resistor between pins ADS and AGND. In I2C bus mode on pin EN HIGH, the TDF8599A waits for further commands. The I2C bus modes are described in Section 9 on page 23. Select non-I2C bus mode by connecting pin ADS to pin AGND. In non-I2C bus mode, the default TDF8599A state is silent mode. The amplifier switches idle (50 % duty cycle) and the audio signal is suppressed at the output. In addition, the capacitor (CSVRR) is charged to half the supply voltage. To enter operating mode, pin SEL_MUTE must be HGH, and S1 is open to allow the capacitor (CON) to be charged by the internal pull-up resistor. Additionally, pin EN must be driven high.

    3. PWM frequency

        The output signal of the amplifier is a PWM signal with a clock frequency of fosc. The frequency is set by connecting a resistor (Rosc) between pins OSCSET and AGND. The optimal clock frequency setting is between 300 kHz and 400 kHz. connection resistance For example, a value of 39 kΩ sets the clock frequency to 320 kHz. The external capacitor (Cosc) has no effect on the oscillator frequency. However, it does reduce jitter and sensitivity to interference. Use a second-order LC demodulation filter in your application to generate an analog audio signal through the speaker.

    4. Spread Spectrum Mode (Main Mode)

        Spread spectrum mode is a technique that modulates the oscillator frequency with a slowly varying signal to broaden the switching spectrum, thereby reducing the spectral density of EMI. Connect the capacitor (CSSM) to pin SSM ena bles Spread spectrum mode . When pin SSM is connected to pin AGND, Spread spectrum mode is disabled. The capacitor on pin SSM (CSSM) sets the spreading frequency when Spread spectrum mode is active. The current (ISSM) flowing in and out of pin SSM is typically 5 μA. This gives a triangular voltage on pin SSM that sweeps around the voltage set by pin OSCSET ± 5 %. The voltage on pin SSM is used to modulate the oscillator frequency.

    5. Frequency hopping (Master mode)

        Frequency hopping is a technique used to change the oscillator frequency for AM tuner compatibility. In Master mode, the resistor connected between pins OSCSET and AGND sets the oscillator frequency (fosc). In I2C-bus mode, this frequency can be varied by ± 10 %. Set bit IB1[D4] to logic 1 and bit IB1[D3] to either logic 0 (0.9 × fosc) or logic 1 (1.1 × fosc).