Test Report: PMP30267RevC Automotive Power Solution
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1 Test Report: PMP30267RevC Automotive Power Solution Description PMP30267 showcases an automotive power supply solution for an infotainment system incorporating the smart diode controller LM74700-Q1 at the input, the pre-boost converter LM5150-Q1 and the dual synchronous buck converter LM5140-Q1. An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and other important disclaimers and information. PMP30267RevC-January 2018 [Automotive Power Solution] 1
2 1 Test Prerequisites 1.1 Voltage and Current Requirements Table 1. PARAMETER Voltage and Current Requirements SPECIFICATIONS Input voltage V / 40V peak Output voltage LM5150-Q1 1.5A Switching frequency LM5150-Q1 Output voltage 1 LM5140-Q1 Output voltage 2 LM5140-Q1 Switching frequency LM5140-Q1 400kHz 3.0A / 6.0A peak 1.5A / 2.5A peak 440kHz 1.2 Required Equipment Lab power supply EA-PS B Electronic load Agilent 6063B LeCroy WaveSurfer 24Xs Network Analyzer Venable [Automotive Power Solution] PMP30267RevC-January 2018
3 2 Testing and Results 2.1 Efficiency and Load Regulation Graphs LM5150-Q1 Efficiency Figure 1 PMP30267RevC-January 2018 [Automotive Power Solution] 3
4 LM5150-Q1 - Load Regulation Figure 2 4 [Automotive Power Solution] PMP30267RevC-January 2018
5 LM5140-Q1 3.3V Output Efficiency Figure 3 PMP30267RevC-January 2018 [Automotive Power Solution] 5
6 LM5140-Q1 3.3V Output Load Regulation Figure 4 6 [Automotive Power Solution] PMP30267RevC-January 2018
7 LM5140-Q1 7.5V Output Efficiency Figure 5 PMP30267RevC-January 2018 [Automotive Power Solution] 7
8 LM5140-Q1 7.5V Output Load Regulation Figure 6 8 [Automotive Power Solution] PMP30267RevC-January 2018
9 2.2 Efficiency Data LM5150-Q1 Input Voltage [V] Current [A] Power [W] Output Voltage [V] Current [A] Power [W] Losses [W] LM5140-Q1 3.3V Output Input Voltage [V] Current [A] Power [W] Output Voltage [V] Current [A] Power [W] Losses [W] LM5140-Q1 7.5V Output Input Voltage [V] Current [A] Power [W] Output Voltage [V] Current [A] Power [W] Losses [W] Efficien cy [%] Efficien cy [%] Efficien cy [%] PMP30267RevC-January 2018 [Automotive Power Solution] 9
10 2.3 Thermal Images LM5150-Q The thermal image (Figure 7) shows the circuit at an ambient temperature of 20 C with an input voltage of 6.0V and 1.0A load on the output. Figure 7 Name Temperature Emissivity Background D C C L C C L C C Q C C U C C 10 [Automotive Power Solution] PMP30267RevC-January 2018
11 LM5140-Q1 The thermal image (Figure 8) shows the circuit at an ambient temperature of 20 C with an input voltage of 12.0V, 3.0A load on the 3.3V output and 1.5A load on the 7.5V output. Figure 8 Name Temperature Emissivity Background L C C L C C Q C C Q C C U C C 2.4 Dimensions - Smart Diode LM74700-Q1 21mm x 6mm - Pre-Boost Converter LM5150-Q1 21mm x 44mm - Dual synchronous Buck LM5140-Q1 21mm x 51mm PMP30267RevC-January 2018 [Automotive Power Solution] 11
12 3 Waveforms 3.1 Switching Node LM5150-Q1 The drain-source voltage of the low-side FET at 3.2V input voltage and 1.5A load on the output is shown in Figure 9. Channel C1 Drain-Source Voltage, -1.0V minimum, 20.7V maximum 5V/div, 1us/div Figure 9 12 [Automotive Power Solution] PMP30267RevC-January 2018
13 LM5140-Q1 3.3V Output The drain-source voltage of the low-side FET at 12.0V input voltage and 6.0A load on the output is shown in Figure 10. Channel C1 Drain-Source Voltage, -1.2V minimum, 17.9V maximum 5V/div, 1us/div Figure 10 PMP30267RevC-January 2018 [Automotive Power Solution] 13
14 LM5140-Q1 7.5V Output The drain-source voltage of the low-side FET at 12.0V input voltage and 2.5A load on the output is shown in Figure 11. Channel C1 Drain-Source Voltage, -1.0V minimum, 20.9V maximum 5V/div, 1us/div Figure [Automotive Power Solution] PMP30267RevC-January 2018
15 3.2 Output Voltage Ripple LM5150-Q1 The output ripple voltage is shown in Figure 12. Channel M1 Output 3.2V Input / 1.5A Load, 202mV peak-peak (1.9%) 100mV/div, 1us/div Channel M2 Output 6.0V Input / 1.5A Load, 107mV peak-peak (1.0%) 100mV/div, 1us/div Figure 12 PMP30267RevC-January 2018 [Automotive Power Solution] 15
16 LM5140-Q1 3.3V Output The output ripple voltage is shown in Figure 13. Channel M1 Channel M2 Output 12.0V Input / 6.0A Load, 77mV peak-peak (2.3%) spikes 50mV/div, 1us/div Output 16.0V Input / 6.0A Load, 80mV peak-peak (2.4%) spikes 50mV/div, 1us/div Figure [Automotive Power Solution] PMP30267RevC-January 2018
17 LM5140-Q1 7.5V Output The output ripple voltage is shown in Figure 14. Channel M1 Channel M2 Output 12.0V Input / 2.5A Load, 83mV peak-peak (1.1%) spikes 50mV/div, 1us/div Output 16.0V Input / 2.5A Load, 85mV peak-peak (1.1%) spikes 50mV/div, 1us/div Figure 14 PMP30267RevC-January 2018 [Automotive Power Solution] 17
18 3.3 Bode Plot LM5150-Q1 The frequency response is shown in Figure V Input, 1.5A Load 406 Hz Bandwidth, 62 deg Phase Margin, -19 db Gain Margin 6.0V Input, 1.5A Load 1.1 khz Bandwidth, 100 deg Phase Margin, -27 db Gain Margin 8.0V Input, 1.5A Load 1.1 khz Bandwidth, 106 deg Phase Margin, -24 db Gain Margin Figure [Automotive Power Solution] PMP30267RevC-January 2018
19 LM5140-Q1 3.3V Output The frequency response is shown in Figure V Input, 6.0A Load 32.4 khz Bandwidth, 64 deg Phase Margin, -13 db Gain Margin 16.0V Input, 6.0A Load 32.5 khz Bandwidth, 66 deg Phase Margin, -13 db Gain Margin Figure 16 PMP30267RevC-January 2018 [Automotive Power Solution] 19
20 LM5140-Q1-7.5V Output The frequency response is shown in Figure V Input, 2.5A Load 40.5 khz Bandwidth, 59 deg Phase Margin, -13 db Gain Margin 16.0V Input, 2.5A Load 36.7 khz Bandwidth, 52 deg Phase Margin, -15 db Gain Margin Figure [Automotive Power Solution] PMP30267RevC-January 2018
21 3.4 Cranking Pulse LM5150-Q1 The response to a cranking pulse (test pulse severe, VW 80000) at 1.5A load and 500ms/div is shown in Figure 18. Channel C1 Channel C2 Input Voltage 2V/div, 500ms/div 10.5V Output Voltage 2V/div, 500ms/div Figure 18 PMP30267RevC-January 2018 [Automotive Power Solution] 21
22 Figure 19 shows a zoom of the most critical point right at the beginning when the input voltage falls from 11.0V to 3.2V within less than 1ms. The output voltage drops down to 6.5V due to very low output capacitance of the boost converter before it recovers and maintains 10.5V. If this voltage dip is not acceptable, the output capacitance of the boost converter has to be increased. Channel C1 Channel C2 Input Voltage 2V/div, 5ms/div 10.5V Output Voltage 2V/div, 5ms/div Figure [Automotive Power Solution] PMP30267RevC-January 2018
23 3.5 Load Transients LM5150-Q1 The response to a load step at 6.0V input voltage is shown in Figure 20. Channel C1 Output Current, Load Step 1.25A to 2.5A 1A/div, 1ms/div Channel C2 Output Voltage, -1.3V undershoot (12.4%), 1.4V overshoot (13.3%) 1V/div, 1ms/div, AC coupled Figure 20 PMP30267RevC-January 2018 [Automotive Power Solution] 23
24 LM5140-Q1 3.3V Output The response to a load step at 12.0V input voltage is shown in Figure 21. Channel C1 Output Current, Load Step 2.0A to 4.0A 2A/div, 1ms/div Channel C2 Output Voltage, -93mV undershoot (2.8%), 85mV overshoot (2.6%) 50mV/div, 1ms/div, AC coupled Figure [Automotive Power Solution] PMP30267RevC-January 2018
25 LM5140-Q1 7.5V Output The response to a load step at 12.0V input voltage is shown in Figure 22. Channel C1 Output Current, Load Step 1.25A to 2.5A 1A/div, 1ms/div Channel C2 Output Voltage, -137mV undershoot (1.8%), 150mV overshoot (2.0%) 100mV/div, 1ms/div, AC coupled Figure 22 PMP30267RevC-January 2018 [Automotive Power Solution] 25
26 3.6 Start-up Sequence LM5150-Q1 The startup waveform at 6.0V input voltage and no load on the 10.5V output is shown in Figure 23. Channel C1 Channel C2 6.0V Input Voltage 2V/div, 2ms/div 10.5V Output Voltage 2V/div, 2ms/div Figure [Automotive Power Solution] PMP30267RevC-January 2018
27 LM5140-Q1 3.3V Output The startup waveform at 12.0V input voltage and no load on the 3.3V output is shown in Figure 24. Channel C1 Channel C2 12.0V Input Voltage 2V/div, 2ms/div 3.3V Output Voltage 2V/div, 2ms/div Figure 24 PMP30267RevC-January 2018 [Automotive Power Solution] 27
28 LM5140-Q 7.5V Output The startup waveform at 12.0V input voltage and no load on the 7.5V output is shown in Figure 25. Channel C1 Channel C2 12.0V Input Voltage 2V/div, 2ms/div 7.5V Output Voltage 2V/div, 2ms/div Figure [Automotive Power Solution] PMP30267RevC-January 2018
29 3.7 Shut-down Sequence LM5150-Q1 The shutdown waveform at 6.0V input voltage and 1.5A load at 10.5V output voltage is shown in Figure 26. Channel C1 Channel C1 6.0V Input Voltage 2V/div, 2ms/div 10.5V Output Voltage 2V/div, 2ms/div Figure 26 PMP30267RevC-January 2018 [Automotive Power Solution] 29
30 LM5140-Q1 3.3V Output The shutdown waveform at 12.0V input voltage and 6.0A load at 3.3V output voltage is shown in Figure 27. Channel C1 Channel C1 12.0V Input Voltage 2V/div, 1ms/div 3.3V Output Voltage 2V/div, 1ms/div Figure [Automotive Power Solution] PMP30267RevC-January 2018
31 LM5140-Q1 7.5V Output The shutdown waveform at 12.0V input voltage and 2.5A load at 7.5V output voltage is shown in Figure 28. Channel C1 Channel C1 12.0V Input Voltage 2V/div, 1ms/div 7.5V Output Voltage 2V/div, 1ms/div Figure 28 PMP30267RevC-January 2018 [Automotive Power Solution] 31
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