Texas Instruments TPS40193 Evaluation Module, 12 Vin, 1.8 Vout, up to 10A TPS40193EVM-001 TPS40193EVM-001 Datenbogen
Produktcode
TPS40193EVM-001
www.ti.com
5.5
Control Loop Gain and Phase Measurement Procedure
20
LOG
´
Channel B
Channel A
(2)
5.6
Equipment Shutdown
6
TPS40193EVM-001 Typical Performance Data and Characteristic Curves
6.1
Efficiency
100
90
80
70
60
50
40
30
20
10
0
h -
Efficiency(%)
0
2
4
6
8
10
12
I
Load Current (A)
-
LOAD
8V
12V
14V
V
V
=
V
=
IN
IN
IN
=
V
= 1.8V
I
= 0A
10A
OUT
OUT
-
TPS40193EVM-001 Typical Performance Data and Characteristic Curves
Follow these steps to measure the control loop gain and phase on the TPS40193EVM-001.
Step 1.
Connect 1kHz–1MHz isolation transformer to TP12 and TP13 as shown in
.
Step 2.
Connect input signal amplitude measurement probe (Channel A) to TP12 as shown in
.
Step 3.
Connect output signal amplitude measurement probe (Channel B) to TP13 as shown in
.
Step 4.
Connect ground lead of Channel A and Channel B to TP11 and TP14, as shown in
Step 5.
Inject 30mV (or less) signal across R14 through isolation transformer.
Step 6.
Sweep frequency from 1kHz to 1MHz, with 10Hz or lower post filter.
Step 7.
Control loop gain can be measured by
Step 8.
Control loop phase is measured by the phase difference between Channel A and Channel B.
Step 9.
Control to output response (power stage transfer function) can be measured by connecting
Channel A probe to TP6 (COMP) and Channel B probe to TP13.
Channel A probe to TP6 (COMP) and Channel B probe to TP13.
Step 10. Output to control response (error amplifier transfer function) can be measured by connecting
Channel B probe to TP6 (COMP) and Channel A probe to TP12
Step 11. Disconnect isolation transformer from TP12 and TP13 before making other measurements
(signal injection into feedback may interfere with accuracy of other measurements).
Follow these steps to power down the EVM.
Step 1.
Shut down oscilloscope.
Step 2.
Shut down V
IN
.
Step 3.
Shut down LOAD1.
Step 4.
Shut down fan.
through
present typical performance curves for the TPS40193EVM-001. Since actual
performance data can be affected by measurement techniques and environmental variables, these curves
are presented for reference only and may differ from actual field measurements.
are presented for reference only and may differ from actual field measurements.
Figure 5. TPS40193EVM-001 Efficiency vs Load Current
SLUU274 – May 2007
Using the TPS40193EVM-001
11