参数资料
| 型号： | TPABASEKITEVM |
| 厂商： | Texas Instruments |
| 文件页数： | 23/32页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE AUDIO AMP PLATFORM |
| 标准包装： | 1 |
| 主要目的： | 音频，音频处理 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | TI's Audio EVM Boards |
| 主要属性： | 即插即用立体声设备的插口 / 单声道功率放大器 EVM 板 |
| 次要属性： | 还可测试输入信号调节 EVM 板，以及耳机放大器 EVM 板 |
| 已供物品： | 板 |
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Power
3.3 Power
TI audio modules installed in the TI Plug-N-Play Audio Amplifier Evaluation
Platform operate from either an unregulated V CC supply or a regulated V DD
supply. The platform can be powered from an on-board battery or from any of
several different external sources.
3.3.1
Platform Power Distribution
The platform is equipped with a number of connectors for power input, and a
V CC bus and a V DD line for on-board power distribution. The V CC bus uses
jumper block JP1 OR JP2 OR JP3 to connect it to the desired power input
connector. Only ONE of these jumpers should be installed at any one time.
On-board switch S1 applies V CC power to the modules installed on the
platform. Note that S1 also controls V DD power only when V DD is supplied by
a power supply/voltage regulator module plugged into platform socket U6, and
not when V DD power is supplied from an external source at screw terminals
J6. LED1 and LED2 indicate the presence of power on the V CC bus and the
V DD line, respectively (Figure 3–4).
Figure 3–4. Platform Power Distribution
J1
VCC Bus
F1
S1
ICC
VCC
VCC
JP1
JP2
JP3
VR1
LED1
C1 470 μ F
R1
U6
Power
Supply
JP4
IDD
JP5 VDD
+
J6
D1 – D4
B1
LED2
F2
VDD
J2
AC/DC
R2
VR2
Jumper JP4 is in series with the V CC bus and allows easy monitoring of module
V CC current consumption (I CC ). JP5 is in series with the V DD line for I DD
measurement. Both current monitoring points are on the load side of the
indicator LEDs, so their current consumption will not be part of the
measurement.
3.3.2
Platform Power Protection
The platform V CC bus and the V DD line are protected against both excessive
voltage levels and reverse power polarity by zener diodes and fuses
connected to form crowbar circuits.
A zener diode is connected backwards between the V CC bus and ground so
that it is reverse-biased. If the input voltage exceeds the zener breakover
voltage, the diode suddenly conducts heavily, forming a low-impedance path
to ground. The resulting high current opens the fuse, removing the voltage.
Details
3-7
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