TB2924FG 查看數據表（PDF） - Toshiba

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TB2924FG

Class D, 20 W × 2-channel (BTL) Low-Frequency Power Amplifier IC

Toshiba 

TB2924FG

Supplementary Explanation (preliminary)

<Control switches>

1. Pin 17 (muting switch)

• Enable or disable audio muting.

• The input amplifier is switched to a dummy amplifier within the IC, so that the audio output is

muted with the amplifier still operating (PWM switched operation with 50% duty ratio).

• Pin 17 outputs a voltage of approximately 2.4 V (approx. 4 VF) when open, while VTH for the built-in

switch is lower than 1.8 V. Leaving the pin open, therefore, disables muting.

• Logic

“H” or open: Demute

“L” (GND): Mute on

2. Pin 16 (standby switch)

• When the voltage on pin 16 becomes 1.8 V or higher, the bias circuit activates, enabling the IC to

operate.

• Logic

“H”: IC active

“L” (GND): IC standby on

<Others>

3. Thermal AGC Function and Thermal Shutdown Circuit

• If the chip temperature exceeds the junction temperature (150°C min.), the thermal AGC function

attenuates the input signal to maintain the chip temperature below the junction temperature.

• If the chip temperature further increases, the thermal shutdown circuit activates. The chip recovers

from the thermal shutdown state once the chip temperature falls below the junction temperature.

4. Master and Slave Oscillation Frequencies (OSC IN, OSC OUT, OSC SW)

• When configuring a multichannel amplifier system with three or more channels, the oscillation

frequency for a single IC can be used as a master and supplied to other ICs to prevent a beat due to a

difference among switching frequencies.(Max.6ch (3ICs))

• The oscillators for slave ICs should be turned off using the OSC SW pin.

“H”: Turn the oscillator on

“L” (GND): Turn the oscillator off

(Example with multiple ICs)

Pre

VCC

VCC/2

26

22

21

OSC SW OSC OUT OSC IN

Master IC

Pre

GND

Open

26

22

21

OSC SW OSC OUT OSC IN

Slave IC

4

2006-01-25

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