Tripath Technology, Inc. - Technical Information
Note 8:
This specification includes the current draw from the internal buck regulator. If an
external floating supply is used, instead of the internal buck regulator, the quiescent
current draw of the VNN supply will be approximately 20mA.
Note 9:
This specification includes the current draw from both the TA2022 and the external
feedback biasing.
Note 10:
Note 11:
This is the current draw of the VN10 pin if an external “floating” 11V supply is used
instead of the internal buck regulator
These supply voltages are calculated using the IVPPSENSE AND IVNNSENSE
values shown in the Electrical Characteristics table. The typical voltage values
shown are calculated using a RVPPSENSE and RVNNSENSE value of 249kohm
without any tolerance variation. The minimum and maximum voltage limits shown
include either a +1% or –1% (+1% for Over-voltage turn on and Under-voltage turn
off, -1% for Over-voltage turn off and Under-voltage turn on) variation of
RVPPSENSE or RVNNSENSE off the nominal 249kohm value. These voltage
specifications are examples to show both typical and worst case voltage ranges for a
given RVPPSENSE and RVNNSENSE resistor value of 249kohm. Please refer to
the Application Information section for a more detailed description of how to calculate
the over and under voltage trip voltages for a given resistor value.
Note 12:
Note 13:
The fact that the over-voltage turn on and over-voltage turn off specifications exceed
the absolute maximum of +/-40V for the TA2022 does not imply that the part will work
at these elevated supply voltages. It also does not imply that TA2022 is tested or
guaranteed at these supply voltages. The supply voltages are simply a calculation
based on the process spread of the IVPPSENSE and IVNNSENSE currents (see Note 11).
The supply voltage must be maintained below the absolute maximum of +/-40V or
permanent damage to the TA2022 may occur.
The supply voltage limitation for 4 ohm single ended (+/-31V), or 8 ohm bridged (+/-
30V), is based on the current limit protection circuitry. The current limit circuitry may
be activated during large output excursions if the recommended supply voltage
ranges are exceeded.
This will result in the amplifier being muted.
5
TA2022 – KLI/1.2/07-04
TRIPATH [ TRIPATH TECHNOLOGY INC. ]
