Setup
3
SLVU950A – August 2013 – Revised February 2019
Copyright © 2013–2019, Texas Instruments Incorporated
TPS3700EVM-202 High voltage (18V) window voltage detector evaluation
module for SON package
2.2
Equipment Setup
•
Set the first power supply voltage between 1.8 V–18 V. Turn the power supply off. Connect the positive
voltage lead from the power supply to J1 (VDD). Connect the ground lead from the power supply to J2
(GND).
•
Set the second power supply voltage between 1.8 V–18 V. Turn the power supply off. Connect the
positive voltage lead from the power supply to J3 (SENSE). Connect the ground lead from the power
supply to J4 (GND).
•
Use the shorting jumper on JP1 and select Monitor Sense
•
Turn on all power supplies
3
Operation
This section provides information about the operation of the TPS3700EVM-202.
3.1
General Operation
The TPS3700EVM-202 is an over and under voltage supervisor. The device monitors a selected voltage
signal (SENSE or VDD). INA+ triggers LOW when INA+ is below the 393.5 mV threshold and triggers
HIGH (VPU) when OUTA goes above 400 mV. OUTB triggers LOW when INB– is above the 400 mV
threshold and triggers HIGH (VPU) when INB– falls beneath 393.5 mV.
The TPS3700EVM-202 is designed to sense a 12-V rail and trigger when the rail falls below 10% or rises
above 10% of 12 V. Specifically, OUTA will trigger LOW during a –10% drop (10.8 V) while OUTB will
trigger LOW during a +10% rise (13.2 V). In between this window, the outputs are pulled up to VPU.
and
show the rising and falling SENSE voltage and its corresponding OUTA and OUTB
response for VDD = 1.8 V and the output pulled up to 5 V.
Figure 1. OUTA and OUTB Response for Sense Voltage Rising