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TA0105A View Datasheet(PDF) - Tripath Technology Inc.

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TA0105A Datasheet PDF : 29 Pages
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Tripath Technology, Inc. - Technical Information
- Change the feedback resistors, RFB, to 18.7K, 1/4W. This requires a total of four resistors (2 per
channel) as both the FDBKNx and GNDKELVINx nodes need to have the series resistors
inserted. This scales the amplifier feedback properly for the TA0104A supply range and results
in the same gain as a standard TA0104A design. The resulting gain equation is as follows.
The modifications needed for channel 1 are shown in Figure 7.
AV ≈ − 20k  19.7k * 2.02 + 1
4.99k Ω + RI 1020
1/2 TA0105A
V5
1.02K 1.02K
Processing
&
Modulation
1.0K GNDKELVIN1 9
1.0K
FDBKN1 18
18.7K 1/4W
18.7K 1/4W
CFB
1.02K 1.02K
AGND
OUTPUT 1
GROUND
OUTPUT 1
AGND
Figure 7: Feedback Structure for TA0104A Emulation
- Add the resistor dividers to both VLOW and VHIGH as shown in Figure 8. These resistors
lower the supply range of the TA0105A to roughly +/-59V to +/-93V, with a maximum
undervoltage turn on voltage of +/-55V, assuming worse case tolerances. It should be noted
that the TA0104A voltage specification of +/-55V to +/-92V were the undervoltage and
overvoltage turn on points, not the inner hysteresis band. The “hot side” of the VNN and VPP
resistors should be connected to pin 24 and pin 23, respectively. Surface mount types can be
used (1/8W is fine) though the resistors need to 1% tolerance. Please note that the
recommended resistor values are slightly different than those used in the TA0104A. This was
done intentionally to produce a symmetrical supply range for VPP and VNN. The overvoltage
and undervoltage values used on the TA0104A resulted in a slightly asymmetrical voltage
supply range that is clearly undesirable. Using 4 external resistors (as opposed to two shown
earlier in this data sheet) results in the most symmetrical supply range possible.
26
TA0105A – RW/ Rev. 2.2/05.05
 

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