PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments Josh Mandelcorn page 1 of 23 June 12-15, 2015 -Table of Contents: Comments & GUI settings page 1 Thermal images at 3A load w/o fan & at 4A load w/o & with fan page 2 Major switching waveform: Full load: 1 pulse and 10 cycles page 3 Ripple out at full load page 4 Efficiency pages 5-7 Start up without and with pre-bias page 8 Step load & load dump response page 9 Details of step load & load dump response across dynamic load resistor page 10 Bode plot with Venable 3120 page 11 Project file settings pages 12-23 Test / bring up log: Based upon thermal runs and inductor saturation rating of 7 A: Targets are 40 degrees C max temperature rise at full load and inductor saturation rating of at least 1.7 full rating. Without fan, 3A steady state / thermal max and 4 A electrical peak can be advised. With fan, 4A steady state can also be advised. R9/R2 ratio as built for 20 mOhms current sense setting. GUI does not allow >15.5 mOhms setting. Hence R9 was increased from 1.5k to 2.49k and with 40mOhm inductor and R2 at 1.5k, gain will now be 15 mOhms an allowed value. See GUI for model t2 with update: 3.0A load margined low then high and then back to no margin. Q
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PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 1 of 23 June 12-15, 2015
-Table of Contents: Comments & GUI settings page 1 Thermal images at 3A load w/o fan & at 4A load w/o & with fan page 2 Major switching waveform: Full load: 1 pulse and 10 cycles page 3 Ripple out at full load page 4 Efficiency pages 5-7 Start up without and with pre-bias page 8 Step load & load dump response page 9 Details of step load & load dump response across dynamic load resistor page 10 Bode plot with Venable 3120 page 11 Project file settings pages 12-23 Test / bring up log: Based upon thermal runs and inductor saturation rating of 7 A: Targets are 40 degrees C max temperature rise at full load and inductor saturation rating of at least 1.7 full rating. Without fan, 3A steady state / thermal max and 4 A electrical peak can be advised. With fan, 4A steady state can also be advised. R9/R2 ratio as built for 20 mOhms current sense setting. GUI does not allow >15.5 mOhms setting. Hence R9 was increased from 1.5k to 2.49k and with 40mOhm inductor and R2 at 1.5k, gain will now be 15 mOhms an allowed value. See GUI for model t2 with update: 3.0A load margined low then high and then back to no margin.
Q
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 2 of 23 June 12-15, 2015
12.35Vin 530mAin 492kHz 1.8102Vout 3.01Aout IR1134 at 51.5 degrees C no fan
12.33Vin 725mA in 493kHz 1.8097Vout 4.01Aout IR1135 at 72 degrees C no fan
12.33 Vin 721mA in 491kHz 1.8088Vout 4.01Aout IR1136 at 60 deg. C ~1M/S airflow
Q
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 3 of 23 June 12-15, 2015
Major waveform one pulse At max 4A load with fan 12.33 Vin 491kHz 721mA in 1.8088Vout 4.01A ~1M/S flow IR1136 at 60 deg. C Full bandwidth here: (scope LeCroy WS3074 750 MHz with 500 MHz probe PP020)
Q Same Major Waveform, but 10 cycles shown:
Q
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 4 of 23 June 12-15, 2015
Output ripple at C111 (22uF ceramic cap near load connector) At max 4A load with fan 12.33 Vin 491kHz 721mA in 1.8088Vout 4.01A ~1M/S flow IR1136 at 60 deg. C 20MHz Bandwidth:
Full bandwidth here: (scope LeCroy WS3074 750 MHz with 500 MHz probe PP020)
Q
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 5 of 23 June 12-15, 2015
Efficiency in % vs. load current in A: 12Vin and 1.8Vout
Q See next 2 pages for detailed data:
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 6 of 23 June 12-15, 2015
Efficiency / losses with fan (~1 Meter per second)
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 8 of 23 June 12-15, 2015
Start up: 12Vin enabled with no load and minimal pre-bias: Overshoot is < 10 mV max
Start up with pre – bias: Same, but with 800 mV pre-bias on output: 20 mV max overshoot, no dip when conversion started
Q
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 9 of 23 June 12-15, 2015
Step load response: 12Vin 1.8 Vout from 0.5A to 2.4A in 0.7 usec: 40mV peak undershoot Vout monitored at C103:
Q Load dump response: And now from 2.3A back to 0.5A load in 2-3 usec: 35mV overshoot
The 0.5 A static load is external to the board.
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 10 of 23 June 12-15, 2015
Details of step load looking at R251 470 mOhms tied to Vout and scope ground tied to Vout: 900 mV in about 0.7 usec or 900/470 = 1.9 A in 0.7 usec or 2.7 A per usec Q250 dynamic load switch pulls R251 – R252 resistor string to ground. Hence, negative going waveform from scope ground at Vout is positive current.
Q And same for load dump: 840 mV removed in about 3 usec or 840/470 = 1.8 A in 3 usec or ~0.6 A per usec
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
Josh Mandelcorn page 11 of 23 June 12-15, 2015
Bode plot: 12Vin and 1.5A load:
Q Composite Bode plots: 0A, 1/2A, 1.5A, 3A and 4A off 1.8V and 12Vin Crossover in 40-49kHz range with > 60 degrees phase margin and gain margin always about 20 dB:
Q
PMP11140 TPS40400 / CSD85301Q2 Test Report 12V to 1.8V 3A / 4A Texas Instruments
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