Bridge-tied-load (BTL) configuration in an amplifier is basically a H-network with the loud-speaker as the “bridge” between two active valve or switcher. This configuration allow a full alternating current signal to be produced at the load (loudspeaker) without a transformer or a symmetric power supply. Here are some benefits of BTL configuration:
§
No need large capacitor for DC
blocking (decoupling)
§
No need for symmetric power supply
for push-pull drive
§
No need for transformer for
push-pull drive
§
Higher “output power” to “supply
voltage” ratio
This
is the figure of the circuit:
Using integrated circuit, such BTL circuitry is presented in
a compact form, and a TDA7056 is one example of this. It’s a mono output
amplifier contained in a 9 pin medium power package. This device is designed
for general audio amplifier such as battery-powered amplifier, portable
mono recorders, radios, or television. TDA7056 has many features such as low
power consumption, short circuit proof, and ESD protection on all pins. For
ultimate compactness, neglecting the power supply filtering caps and input
loading stabilizer resistor, there would be no external components is needed to
build a fully functional amplifier circuit! Power-on-click suppression system
make this device also no switch on/off clicks. Finally, TDA7056 has good
stability.
