Posts, Probes, and Jumpers
13
SNVU526 – May 2016
Copyright © 2016, Texas Instruments Incorporated
LM53625xQEVM and LM53635xQEVM User's Guide
Figure 13. Position of the EMI Filter Components on PCB – Bottom Layer
6
Posts, Probes, and Jumpers
6.1
VIN1 and GND1 Posts
Standard input posts from power supply to operate EVM. The maximum input voltage is 36 V with 42 V
absolute maximum transient.
6.2
VOUT and GND Posts
Standard output posts to load. Use sufficient lab cables and preferable twist them to reduce inductive
parasitic of lab cables. The typical output voltage is 5 V or 3.3 V.
6.3
IN+ and IN- Posts
Standard Input posts for EMI Measurements so the IC is operated with EMI input Filter. By default there is
a 2-stage filter assembled with a wire wound Inductor PI-Filter for low frequency filtering followed by stage
utilizing a ferrite bead for high frequency filtering. If one wishes to measure a setup with a common mode
choke; add the choke and remove bypass resistors R1 and R2.
6.4
EN and GND2 Probe
EN and GND2 probe can be used to measure the enable voltage or drive it from external source. If an
external source is used make sure to remove jumper J2. By default J2 jumper is set EN to VIN.
6.5
VINs, VOUTs, and GNDs Probe
VINs and VOUTs are sense points for input and output voltage.
NOTE:
Do not use for power supply or load.
These probe points are intended for use as kelvin sense point for static measurements like efficiency or
line- or load regulation. For dynamic measurements please measure directly over the input capacitors C1
and C2 or directly over the output capacitor CO1 and CO2.
6.6
BIAS and GNDS Probe
BIAS probe senses the bias voltage to the IC. Bias voltage is provided from the output voltage of the IC
over Rbias = 3
Ω
resistor. An external Bias supply voltage can be provided by removing Rbias located on
bottom side of PCB to disconnect IC output voltage as source for bias.