Texas Instruments Evaluation Module for TPS40322 TPS40322EVM-679 TPS40322EVM-679 데이터 시트
제품 코드
TPS40322EVM-679
Test Procedure
6
Test Procedure
6.1
Load Regulation Measurement Procedure
1. Ensure LOAD1 and LOAD2 are set to constant-current mode and to set to sink 0 A.
2. Increase VIN from 0 V to 12 V
2. Increase VIN from 0 V to 12 V
DC
. VOUT1 and VOUT2 should be in regulation once VIN is 7.8 V or
greater.
3. Set LOAD2 to 10 A.
4. Vary LOAD1 from 0 A to 10 A. VOUT1 and VOUT2 should remain within regulation per
4. Vary LOAD1 from 0 A to 10 A. VOUT1 and VOUT2 should remain within regulation per
5. Set LOAD1 to 10 A.
6. Vary LOAD2 from 10 A to 0 A. VOUT1 and VOUT2 should remain within regulation per
6. Vary LOAD2 from 10 A to 0 A. VOUT1 and VOUT2 should remain within regulation per
6.2
Line Regulation Measurement Procedure
1. Set LOAD1 and LOAD2 to constant-current mode and to set to sink 10 A.
2. Vary VIN from 8.0 V to 15.0 V
2. Vary VIN from 8.0 V to 15.0 V
DC
. VOUT1 and VOUT2 should remain within regulation per
6.3
Control Loop Gain and Phase Measurement Procedure
1. Connect a 1-kHz to 1-MHz isolation transformer to TP11, CHA1, and TP9, CHB1, for Output 1 or
TP20, CHA2, and TP22, CHB2, for Output 2.
2. Connect the input signal amplitude measurement probe (Channel A) to TP11 with the ground lead
connected to TP12 for Output 1 or TP20 with the ground lead connected to TP21 for Output 2.
3. Connect the output signal amplitude measurement probe (Channel B) to TP9 with the ground lead
connected to TP10 for Output 1 or TP22 with the ground lead connected to TP22 for Output 2.
4. Inject a 25-mV, or less, signal across TP11 and TP9 for Output 1 or across TP20 and TP22 for Output
2 through the isolation transformer.
5. Sweep the frequency from 100 Hz to 1 MHz with 10-Hz or lower post filter.
6. Control loop gain can be measured by 20 x LOG(ChB/ChA)
7. Control loop phase is measured by the phase difference between ChA and ChB.
8. Disconnect the isolation transformer from the EVM before making other measurements. The signal
6. Control loop gain can be measured by 20 x LOG(ChB/ChA)
7. Control loop phase is measured by the phase difference between ChA and ChB.
8. Disconnect the isolation transformer from the EVM before making other measurements. The signal
injection into the feedback may interfere with the accuracy of other measurements.
6.4
Enabling/Disabling the Outputs
1. The user may disable Output 1 by shorting pin 2 on JP1 to pin 3 on JP1.
2. The user may disable Output 2 by shorting pin 2 on JP3 to pin 3 on JP3.
2. The user may disable Output 2 by shorting pin 2 on JP3 to pin 3 on JP3.
6.5
Sequencing the Outputs
1. The user can sequence the outputs so that Output 2 starts before Output 1 by shorting pin 1 of JP2 to
pin 2 of JP2.
2. The user can sequence the outputs so that Output 1 starts before Output 2 by shorting pin 1 of JP4 to
pin 2 of JP4.
6.6
Equipment Shutdown
1. Shut down LOAD1 and LOAD2.
2. Shut down VIN.
2. Shut down VIN.
8
Dual Output Synchronous Buck Converter
SLUU506
–
June 2011
Copyright
©
2011, Texas Instruments Incorporated