Datasheet

95
90
85
80
75
70
65
60
h - Efficiency - %
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
I - Load Current - A
LOAD
V = 8 V
IN
V = 12 V
IN
V = 22 V
IN
(a) F = 350 kHz
SW
95
90
85
80
75
70
65
60
h - Efficiency - %
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
I - Load Current - A
LOAD
V = 8 V
IN
V = 12 V
IN
V = 22 V
IN
(b) F = 700 kHz
SW
Performance Data and Typical Characteristic Curves www.ti.com
6.2 Line/Load Regulation and Efficiency Measurement Procedure
1. Set up TPS53126EVM-600 per Section 5.2.
2. Start up the TPS53126EVM-600 per Section 6.1.
3. Adjust VIN to desired value between 8 Vdc and 22 Vdc.
4. Adjust LOAD1/LOAD2 to desired load between 0 Adc and 4 Adc.
5. Read input voltage, output voltage, and input current from V1, V2/V3, and A1, respectively.
6. Shut down the TPS53126EVM-600 per Section 6.4.
6.3 Output Ripple Voltage Measurement Procedure
1. Set up the TPS53126EVM-600 per Section 5.2.
2. Start up the TPS53126EVM-600 per Section 6.1.
3. Adjust V
IN
to desired value between 8 Vdc and 22 Vdc.
4. Adjust LOAD1/LOAD2 to desired load between 0 A and 4 Adc.
5. Connect the oscilloscope probe to TP8 and TP4 for V
OUT1
, or TP7 and TP6 for V
OUT2
as shown in
Figure 2.
6. Measure output ripple.
7. Shut down TPS53126EVM-600 per Section 6.4.
6.4 Shutdown Procedure
1. Set SW1 to DIS.
2. Set SW2 to DIS.
3. Decrease LOAD1 to 0 A, and shut down LOAD1.
4. Decrease LOAD2 to 0 A, and shut down LOAD2.
5. Decrease V
IN
to 0 V, and shut down V
IN
.
6. Shut down the fan.
7 Performance Data and Typical Characteristic Curves
Figure 4 through Figure 11 present typical performance curves for the TPS53126EVM-600. Because
actual performance data can be affected by measurement techniques and environmental variables, these
curves are presented for reference and may differ from actual field measurements.
7.1 Efficiency
Figure 4. Efficiency vs Load (V
IN
= 8 V–22 V, V
OUT1
= 1.05 V, I
OUT1
= 0 A–4 A)
10
TPS53126EVM-600 SLVU435–February 2011
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