Texas Instruments 10A, 12V Input, 1.8V Output Synchronous Buck Converter using the TPS40192 and NexFET MOSFETs TPS40192E TPS40192EVM-525 데이터 시트
제품 코드
TPS40192EVM-525
20
LOG
ǒ
ChannelB
ChannelA
ChannelA
Ǔ
60
65
70
75
80
85
90
95
h
-Efficiency-%
I
- Load Current - A
O
0
2
4
6
8
10
12
V = 8 V
I
V = 12 V
I
V = 14 V
I
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TPS40192EVM Typical Performance Data and Characteristic Curves
4.5
Control Loop Gain and Phase Measurement Procedure
1. Connect a 1-kHz to 1-MHz isolation transformer to TP12 and TP13 as shown in
.
2. Connect the input signal amplitude measurement probe (channel A) to TP12 as shown in
3. Connect the output signal amplitude measurement probe (channel B) to TP13 as shown in
.
4. Connect the ground lead of channel A and channel B to TP11 and TP14 as shown in
.
5. Inject a 30-mV or less signal across R14 through the isolation transformer.
6. Sweep the frequency from 1 kHz to 1 MHz with a 10-Hz or lower post filter
6. Sweep the frequency from 1 kHz to 1 MHz with a 10-Hz or lower post filter
7. The control loop gain can be measured by
8. The control loop phase is measured by the phase difference between channel A and channel B.
9. The control-to-output response (power stage transfer function) can be measured by connecting the
8. The control loop phase is measured by the phase difference between channel A and channel B.
9. The control-to-output response (power stage transfer function) can be measured by connecting the
channel A probe to TP6 (COMP) and the channel B probe to TP13.
10. The output-to-control response (error amplifier transfer function) can be measured by connecting the
channel B probe to TP6 (COMP) and the channel A probe to TP12.
11. Disconnect the isolation transformer from TP12 and TP13 before making other measurements. (The
signal injection into feedback may interfere with the accuracy of other measurements.)
4.6
Equipment Shutdown
1. Shut down the oscilloscope.
2. Shut down LOAD1.
3. Shut down V
2. Shut down LOAD1.
3. Shut down V
IN
.
4. Shut down the fan.
5
TPS40192EVM Typical Performance Data and Characteristic Curves
5.1
Efficiency
through
present typical performance curves for the TPS40192EVM-525. Because 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. TPS40192EVM-525 Efficiency vs Load Current,
Vin = 8 V - 14 V, Vout = 1.8 V, Iout = 0 A - 10 A
11
SLUU395 – December 2009
Using the TPS40192EVM-525, A 12-V Input, 1.8-V Output, 10-A Synchronous
Buck Converter
Copyright © 2009, Texas Instruments Incorporated