Using The TPA0103 EVM With the
3.3.2.1S1 Ð Shutdown Jumper
To have the module amplifier IC enter the shutdown mode when the module mute control input is activated, set shutdown jumper S1 to ON.
The mute control output pin on the TPA0103 amplifier IC goes high when the mute mode is selected by the output mode jumpers (S2 and S4). Jumper S1 connects the mute output pin to the shutdown control input pin of the IC so that when S1 is ON, the IC is forced into shutdown mode instead of mute mode when the mute mode is selected. When S1 is OFF, a pulldown resistor on the module holds the IC shutdown control input pin low, keeping the IC out of the shutdown mode.
The shutdown mode reduces IC current consumption to approximately 5 μA compared to approximately 1.5 mA in the mute mode. It takes longer, however, to resume normal operation from the shutdown mode (approx. 1 s to 2 s) than it takes to resume normal operation from the mute mode (approx. 100 ms to
500ms).
3.3.2.2S2 and S4 Ð Output Mode Control Jumpers
Two IC amplifier output mode control pins select among three output modes and mute. These pins, Mode A and Mode B, are brought out to module pins and also have jumpers that can hardwire the IC amplifier control inputs high. Table 3±2 shows the relationship between the IC amplifier control inputs and the output modes.
Table 3±2. TPA0103 Output Modes
TERMINAL | Mute | Center Only | L/R Only | |
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MODE A | L | H | L | H |
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MODE B | L | L | H | H |
Note: L = logic low, H = logic high
Jumper S2 connects the Mode B output mode control input pin on the amplifier IC directly to VDD regardless of the state of the Mode B module control input. When S2 is OFF, a pulldown resistor on the module holds the Mode B output mode control input pin low. The Mode B control input pin is not directly controlled by anything on the platform Ð the platform socket for that module pin is N/C.
Jumper S4 connects the Mode A output mode control input pin on the amplifier IC directly to VDD regardless of the state of the Mode A module control input, or the input select module control input (HP/L*), or the status of jumper S3 when autosense jumper S5 is set to ON. When S4 is OFF, a pulldown resistor on the module holds the amplifier IC Mode A output mode control input pin low.
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