TB2924FG Toshiba, TB2924FG Datasheet - Page 4

• Manufacturer Part Number: TB2924FG
• Manufacturer: Toshiba

Specifications of TB2924FG

• No. Of Channels: 2
• Package: HSOP 36-P-450-0.65
• Recommended Vcc (v): 15
• Rl=2 Ohm: -
• Rl=4 Ohm: 19.5W x 2
• Rl=8 Ohm: 10.5W x 2
• Features/built-in Functions: 2 BTL channels, mute, standby switch, various protection circuits, Class-D high efficiency
• Operating Voltage (v): 11.4 to 18/ 11.4 to 20

Supplementary Explanation
<Control switches>
<Others>
1. Pin 17 (muting switch)
2. Pin 16 (standby switch)
3. Thermal AGC Function and Thermal Shutdown Circuit
4. Master and Slave Oscillation Frequencies (OSC IN, OSC OUT, OSC SW)
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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 V
switch is lower than 1.8 V. Leaving the pin open, therefore, disables muting.
Logic
“H” or open: Demute
“L” (GND): Mute on
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
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.
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)
OSC SW
V
Pre
26
CC
OSC OUT
22
Master IC
OSC IN
V
(preliminary)
CC
21
/2
OSC SW
4
26
OSC OUT
GND
Pre
Open
22
Slave IC
F
) when open, while V
OSC IN
21
TH
TB2924FG
for the built-in
2006-01-25