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LM4701 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM4701 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 15 page Typical Performance Characteristics (Continued) Application Information MUTE MODE By placing a logic-high voltage on the mute pin, the signal going into the amplifiers will be muted. If the mute pin is left floating or connected to a logic-low level, the amplifier will be in a non-muted state. Refer to the Typical Performance Characteristics section for curves concerning Mute Attenu- ation vs Mute Pin Voltage. STANDBY MODE The standby mode of the LM4701 allows the user to drasti- cally reduce power consumption when the amplifier is idle. By placing a logic-high voltage on the standby pin, the ampli- fier will go into Standby Mode. In this mode, the current drawn from the V CC supply is typically less than 10 µA total for both amplifiers. The current drawn from the V EE supply is typically 2.1 mA. Clearly, there is a significant reduction in idle power consumption when using the standby mode. Re- fer to the Typical Performance Characteristics section for curves showing Supply Current vs Standby Pin Voltage for both supplies. UNDER-VOLTAGE PROTECTION Upon system power-up, the under-voltage protection cir- cuitry allows the power supplies and their corresponding ca- pacitors to come up close to their full values before turning on the LM4701 such that no DC output spikes occur. Upon turn-off, the output of the LM4701 is brought to ground be- fore the power supplies such that no transients occur at power-down. OVER-VOLTAGE PROTECTION The LM4701 contains over-voltage protection circuitry that limits the output current to approximately 3.5 Apk while also providing voltage clamping, though not through internal clamping diodes. The clamping effect is quite the same, however, the output transistors are designed to work alter- nately by sinking large current spikes. SPiKe PROTECTION The LM4701 is protected from instantaneous peak-temperature stressing of the power transistor array. The Safe Operating Area graph in the Typical Performance Characteristics section shows the area of device operation where SPiKe Protection Circuitry is not enabled. The wave- form to the right of the SOA graph exemplifies how the dy- namic protection will cause waveform distortion when en- abled. THERMAL PROTECTION The LM4701 has a sophisticated thermal protection scheme to prevent long-term thermal stress of the device. When the temperature on the die reaches 165˚C, the LM4701 shuts down. It starts operating again when the die temperature drops to about 155˚C, but if the temperature again begins to rise, shutdown will occur again at 165˚C. Therefore, the de- vice is allowed to heat up to a relatively high temperature if Pulse Power Limit DS100835-40 Pulse Power Limit DS100835-41 Supply Current vs Case Temperature DS100835-42 Standby Current (I CC)vs Standby Pin Voltage DS100835-43 Supply Current (I EE)vs Standby Pin Voltage DS100835-44 Input Bias Current vs Case Temperature DS100835-45 www.national.com 11 |
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