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8V-14V VIN Atom power design PMP5252


PMP5252 TPS51120 3.3V5A power Test Report PMP5252 Test report: 3.3V power TPS51120 Page 1: regulation / efficiency / thermal Page 2: main waveform Page 3: Start up Page 4: Load dump response Page 5: Output ripple Control is D-CAP mode, hence no meaningful Bode plots!!! Regulation / losses: Vin Volts Iin mA

Texas Instruments

Vout1 Volts 3.281 3.282 3.283 3.284 3.285 3.286 3.281 3.282 3.283 3.284 3.284 3.286 3.279 3.280 3.281 3.282 3.283 3.285

Iout1 mA 5000 3747 2505 1252 624.5 0 5000 3747 2505 1252 624.5 0 5000 3747 2505 1252 625 0

Bias power for other outputs mW

Losses in mW**
1897 1250 755 424 235 6 1780 1152 680 376 229 6 1570 981 550 282 188 6

Efficiency %

14.01 14.01 14.03 14.02 14.03 14.03 12.02 12.03 12.00 12.00 12.00 12.01 7.99 7.99 7.99 8.02 8.00 8.00

1309 967 640 323.5 163 3.10 1516 1118 742 374 190 3.59 2253 1661 1097.5 547.5 280 5.29

37 37 37 37 37 37 37 37 37 37 37 37 36 36 36 36 36 36

89.6 90.8 91.6 90.7 89.7 N/A 90.2 91.4 92.4 91.6 89.9 N/A 91.3 92.6 93.7 93.6 91.6 N/A

Hot spot: 14Vin and 5A load: High side switch at 53 degrees Celsius, snubber R at 54 degrees C, and choke at about 52 degrees C. Ambient 23-25 degrees C.

Josh Mandelcorn

page 1 of 5

February 2-3, 2010

PMP5252 TPS51120 3.3V5A power Test Report Major waveform: 14Vin max and full 5.0A load:

Texas Instruments

Josh Mandelcorn

page 2 of 5

February 2-3, 2010

PMP5252 TPS51120 3.3V5A power Test Report

Texas Instruments

Start up: 12Vin and 3.3V Enable applied: Pin 12 of the TPS51120 pulled high:

Same, but no load:

Qq

Josh Mandelcorn

page 3 of 5

February 2-3, 2010

PMP5252 TPS51120 3.3V5A power Test Report Load dump response: First short term and then longer term: 12Vin

Texas Instruments

Qq Longer term response to dump to no load:

Josh Mandelcorn

page 4 of 5

February 2-3, 2010

PMP5252 TPS51120 3.3V5A power Test Report Ripple out at C315: 14Vin and max 5A out:

Texas Instruments

Qq

Josh Mandelcorn

page 5 of 5

February 2-3, 2010


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