PMP8372

04/10/2014 PMP8372 Test Results 1 Startup C1: Vout_TP7(before LDO); C4:Vout_TP9(After LDO); LOAD=0mA C3: Vout_TP7(before LDO); C4:Vout_TP9(After LDO); LOAD=250mA Page 1 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results C1: Neg_Vout_TP17(before LDO); C4: Neg_Vout_TP19(After LDO); LOAD=0mA C1: Neg_Vout_TP17(before LDO); C4: Neg_Vout_TP19(After LDO); LOAD=250mA Page 2 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results 2 Efficiency The efficiency is shown in the figure below. Iout vs. Efficiency 0.75 0.7 0.65 0.6 0.55 Vin=24V 0.5 0.45 0.4 0.35 0.3 0 0.2 0.4 Vin(V) 23.996 23.99 23.982 24.071 24.054 24.043 24.16 23.988 24.036 24.083 24.028 23.973 24.017 24.065 24.07 24.052 Page 3 of 15 Iin(mA) 3.1 6.2 10.7 16.5 25.5 31.25 45.26 60.05 87.6 115.7 144.1 172.6 201.5 228.5 258.3 286.2 0.6 Vout(V) 5.065 5.063 5.06 5.049 5.039 5.046 5.038 5.023 5.008 4.986 4.965 4.959 4.958 4.943 4.931 4.916 0.8 1 Iout(mA) 5 15.4 30 49.5 80 100 149.5 202 300.1 401.6 501.2 599.7 702.9 799.7 900 1000 Power Management Solutions 04/10/2014 PMP8372 Test Results 3 Output Ripple Voltage The output ripple voltage is shown in the figure below. C3: Vout_TP7(before LDO); C4:Vout_TP9(After LDO); LOAD=250mA C1: Neg_Vout_TP17(before LDO); C4: Neg_Vout_TP19(After LDO); LOAD=250mA Page 4 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results 4 Noise Measurement The output noise is shown in the figure below. Input voltage = 24V Output voltage = +5V Load current = 100mA Output Noise (μV/ Hz) 100 10 Before RMS Noise Range μVrms 10Hz-100KHz 1 0.1 0.01 0.001 1.E+01 100Hz-100k Hz 1.E+02 Before LDO RMS Noise Range μVrms 628.30 10Hz-100KHz 626.06 100Hz-100kHz 1.E+03 1.E+04 1.E+05 Frequency (Hz) Before LDO After LDO Input voltage = 24V Output voltage = +5V Load current = 1A 1.E+06 After LDO RMS Noise Range μVrms After RMS 10Hz-100KHz Before NoiseRMS 100Hz-100kHz Range Noise μVrms Range 10Hz-100KHz μVrms 10Hz-100KHz 100Hz-100k Hz 100Hz-100k Hz Hz) 100 Output Noise (μV/ 1.E+07 10 1 0.1 0.01 0.001 1.E+01 1.E+02 Before RMS Noise Range μVrms 10Hz-100KHz 100Hz-100kHz Page 5 of 15 1.E+03 1.E+04 1.E+05 Frequency (Hz) before LDO After LDO 1.E+06 1.E+07 After RMS Noise Range μVrms 10Hz-100KHz 100Hz-100kHz Power Management Solutions 04/10/2014 PMP8372 Test Results Input voltage = 24V Output voltage = -5V Load current = 100mA Output Noise (μV/ Hz) 100 10 1 0.1 0.01 0.001 1.E+01 1.E+02 Before RMS Noise Range μVrms 10Hz-100KHz 100Hz-100kHz 1.E+03 1.E+04 1.E+05 Frequency (Hz) Before LDO After LDO 1.E+06 1.E+07 After RMS Noise Range μVrms 10Hz-100KHz 100Hz-100kHz Input voltage = 24V Output voltage = -5V Load current = 1A Output Noise (μV/ Hz) 100 10 1 0.1 0.01 0.001 1.E+01 1.E+02 Before RMS Noise Range μVrms 10Hz-100KHz 100Hz-100kHz Page 6 of 15 1.E+03 1.E+04 1.E+05 Frequency (Hz) Before LDO After LDO 1.E+06 1.E+07 Neg6V RMS Noise Range μVrms 10Hz-100KHz 100Hz-100kHz Power Management Solutions 04/10/2014 PMP8372 Test Results RMS noise range from 10Hz-100KHz(μVrms) Voltage 1A Before LDO (Positive) 670.25 After LDO (Positive) 13.66 Before LDO (Negative) 628.30 After LDO (Negative) 35.71 0.1A 346.99 12.61 3011.36 32.78 Load RMS noise range from 100Hz-100KHz(μVrms) Voltage 1A Before LDO (Positive) 668.35 After LDO (Positive) 8.62 Before LDO (Negative) 626.06 After LDO (Negative) 32.73 0.1A 342.91 8.05 3010.81 31.82 Load Page 7 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results 5 Load Transients The figures below show output response to load transients. The input voltage was set to 20V. Channel 2 : Load current Channel 3 : 5Vout after LDO (DC coupled) Channel 4 : 5Vout before LDO (DC coupled) Page 8 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results Channel 2 : Load current falling Channel 3 : 5Vout after LDO (DC coupled) Channel 4 : 5Vout before LDO (DC coupled) Channel 2 : Load current falling Channel 3 : 5Vout after LDO (DC coupled) Channel 4 : 5Vout before LDO (DC coupled) Page 9 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results Channel 1 : -5Vout before LDO (DC coupled) Channel 2 : Load current Channel 4 : -5Vout after LDO (DC coupled) Page 10 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results 6 Switch Node Waveforms Input voltage = 24V Output voltage = 5V Load current = 250mA (full BW) Input voltage = 24V Output voltage = 5V Load current = 900mA (full BW) Page 11 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results Input voltage = 24V Output voltage = -5V Load current = 250mA (full BW) Page 12 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results 7 Control Loop Frequency Response Input voltage = 24VDC Output voltage = 5V Load current = 250mA Phase margin = 76.14° Bandwidth = 30.8kHz Page 13 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results 8 Photo The images below show the top and bottom view, respectively, of the PMP8372 prototype board. Page 14 of 15 Power Management Solutions 04/10/2014 PMP8372 Test Results 9 Thermal Analysis The images below show the infrared images taken from the FlexCam with full load applied. Input voltage = 20 VDC. Page 15 of 15 Power Management Solutions IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. These resources are intended for skilled developers designing with TI products. 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