PMP6857 TPS40322 Test Report 9/13/2011
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1 PMP6857 TPS40322 Test Report 9/13/2011 The following test report is for the PMP6857 TPS40322: Vin = 9 to 15V 25A 25A The tests performed were as follows: 1. EVM Photo 2. Thermal Profile 3. Startup (No Load) 4. Shutdown (1A Load) 5. Output Voltage Ripple (No Load) 6. Output Voltage Ripple (Full Load) 7. Load Transient (50% to 100%) 8. Switch Node (No Load) 9. Switch Node Ringing (Full Load) 10. Load Regulation 11. Efficiency 12. Loop Response (Full Load) Page 1 of 9
2 1 EVM Photo The photo below shows the top and bottom of the PMP6857_REVA Board Top of Board Bottom of Board 2 Thermal Profile The figures below show the thermal profile of the board. The input voltage is 12V. Both outputs are fully loaded (25A). The two CSD87350 FETs are shown in the boxes. The 5V FET is on the right. The 3.3V FET is on the left. Page 2 of 9
3 3 Startup The picture below shows the startup waveform. The input voltage is 12V, the outputs are not loaded. The time-base is set to 2ms/division. Channel 1 (Yellow): 3.3V Output (2V/Division) Channel 2 (Pink): 5V Output (2V/Division) 4 Shutdown The picture below shows the shutdown waveform. The input voltage is 12V, Both outputs are loaded to 1A. The time-base is set to 10ms/division. Channel 1 (Yellow): 3.3V Output (2V/Division) Channel 2 (Pink): 5V Output (2V/Division) Page 3 of 9
4 5 Output Voltage Ripple (No Load) The pictures below show the output ripple for each output. The input is 12V. The outputs are not loaded. Channel 2 (Pink): Output Votlage (20mV/Division; AC Coupled) 3.3V Output Ripple 5V Output Ripple 6 Output Voltage Ripple (Full Load) The pictures below show the output ripple for each output. The input is 12V. The outputs are fully loaded at 25A. Channel 2 (Pink): Output Votlage (20mV/Division; AC Coupled) 3.3V Output Ripple 5V Output Ripple Page 4 of 9
5 7 Load Transient (50% to 100%) The figures below show the transient response for each output. The input voltage is 12V. The current is pulsed from 12.5A to 25A. Channel 2 (Pink): Output Votlage (20mV/Division; AC Coupled) Channel 4 (Green) : Output Current (10A/Division). 3V Output Transient 5V Output Transient 8 Switch Node (No Load) The picture below shows the switching waveforms for each of the outputs Channel 1 (Yellow): 3.3V Switch Node (2V/Division) Channel 2 (Pink): 5V Switch Node (2V/Division) Page 5 of 9
6 9 Switch Node Ringing The picture below shows the switching waveforms for each of the outputs Channel 1 (Yellow): 3.3V Switch Node (5V/Division) No Load Full Load Channel 1 (Yellow): 5V Switch Node (5V/Division) No Load Full Load Page 6 of 9
7 10 Load Regulation The graphs below show the load regulation for each output Output Voltage vs. Load Current Output Voltage (V) Load Current (A) 9Vin 12Vin 15Vin Output Voltage vs. Load Current Output Voltage (V) Load Current (A) 9Vin 12Vin 15Vin Page 7 of 9
8 11 Efficiency The graphs below show the efficiency for each output. 96% 94% 92% Efficiency vs. Load Current Efficiency 90% 88% 86% 84% 82% 80% Load Current (A) 9Vin 12Vin 15Vin 3.3V Output Efficiency vs. Load Current Efficiency 98% 96% 94% 92% 90% 88% 86% 84% 82% 80% Load Current (A) 9Vin 12Vin 15Vin 5V Output Page 8 of 9
9 12 Loop Response The images below show the loop response of each converter. The input voltage is 12V. Each output is loaded with 25A. 3.3V Output 5V Output Page 9 of 9
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