Test Report PMP10708
1 07/22/2015
Test Report
For PMP10708
07/22/2015
Test Report PMP10708
2 07/22/2015
Table of Contents
1. Design Specifications ............................................................................................................................ 3
2. Circuit Description and PCB details ....................................................................................................... 3
3. PMP10708 Board Photos ...................................................................................................................... 4
4. Thermal Data ......................................................................................................................................... 5
5. Efficiency ............................................................................................................................................... 6
5.1 Efficiency Chart ................................................................................................................................... 6
5.2 Efficiency Data..................................................................................................................................... 7
6 Waveforms ................................................................................................................................................. 9
6.1 Load Transient Response .................................................................................................................... 9
6.2 Startup .............................................................................................................................................. 11
6.3 Switch Node Voltage and Output Ripple .......................................................................................... 14
6.4 Frequency Dither .............................................................................................................................. 17
6.5 Short Circuit ...................................................................................................................................... 18
6.6 Short Circuit Recovery ....................................................................................................................... 20
6.7 Frequency Analysis ............................................................................................................................ 22
Test Report PMP10708
3 07/22/2015
1. Design Specifications
Vin Minimum
3.5VDC
Vin Maximum
36VDC
Vout
6.5 VDC
Iout
1.2A
Approximate Switching Frequency
~400KHz
2. Circuit Description and PCB details
PMP10708 is a 7.8W 4-switch buck-boost converter using the LM5175 controller IC. The design accepts
an input voltage of 3.5Vin to 36Vin and provides an output of 6.5Vout capable of supplying 1.2A of
current to the load. The design can operate as low as 3V during start-stop or other line transient
conditions.
The design implements a 41kHz frequency modulation through the DITH pin. The mode pin is configured
in CCM with hiccup disabled. The bias pin of the device powers the LM5175 during low Vin operation
from Vout through an internal LDO with a diode drop.
The design was built on PMP10708 with a dimension of 75mm * 40mm. Four layer PCB was used for the
design, 1oz copper on top and bottom layer, 0.5oz copper on the internal layer.
Test Report PMP10708
4 07/22/2015
3. PMP10708 Board Photos
Board Dimensions: 75mm x 40mm
Board Photo (Top)
Board Photo (Bottom)
Test Report PMP10708
5 07/22/2015
4. Thermal Data
IR thermal image taken at steady state with 6.5Vin and 1.2A load (no airflow)
IR thermal image taken at steady state with 12Vin and 1.2A load (no airflow)
评论0