Texas Instruments TPS386040EVM Evaluation Module TPS386040EVM TPS386040EVM Datenbogen
Produktcode
TPS386040EVM
ITN
SU
SU
SL
ITN
ITN
S L
SL
SU
V
= 400 mV
R
VCC_target
R
= R
1, VCC_target = V
+1
V
R
Example for EVM SENSE1 input from LDO2
VCC_target = 1.35 V, R
= 100 kΩ
1.35V
R
= 100 kΩ
1 = 237.5 kΩ (cho
0.4V
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ose 237 kΩ)
237kΩ
VCC_target = 0.4 V
+1 = 1.348 V
100kΩ
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REF
ITP
ITP
S42L
S42H
REF
ITP
S42L
ITP
REF
ITP
S42H
S42H
V
= 1.2 V, V
= 400 mV
V
VCC42_target
R
= R
V
V
R
VCC42_target = V
(V
V
)
R
Example for EVM SENSE4H input from NEGVDC
VCC42_target =
4.2 V, R
= 49.9 kΩ
R
-
´
-
-
´
-
-
(
)
(
)
S42L
0.4 V
4.2 V
= 49.9 kΩ
= 286.9 kΩ
choose 287 kΩ
1.2 V
0.4 V
287 kΩ
VCC42_target = 0.4V
(1.2V- 0.4V) = 4.201 V
49.9 kΩ
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Description
www.ti.com
4.2.2
Supervisor Inputs
The TPS386000/40 supervisor inputs (SENSE1L, SENSE2L, SENSE3L, SENSE4L, and SENSE4H) can
be used to monitor onboard or off board voltages. Jumpers are used to select the analog source. The
default EVM configuration monitors the onboard voltage rails as described above. The SENSE1L-SENS4L
inputs are programmed with a resistor divider which turns on at approximately 75% of the rail nominal
output voltage. The SENS4H input is set below the 400mV threshold by default when using the onboard
power supplies.
be used to monitor onboard or off board voltages. Jumpers are used to select the analog source. The
default EVM configuration monitors the onboard voltage rails as described above. The SENSE1L-SENS4L
inputs are programmed with a resistor divider which turns on at approximately 75% of the rail nominal
output voltage. The SENS4H input is set below the 400mV threshold by default when using the onboard
power supplies.
The supervisor inputs can also be used to monitor an external power supply source by removing the
associated jumper shunt and connecting the jumper pin to the external source. The SENSE input trip
points can be adjusted by changing the resistor dividers using the following equations:
associated jumper shunt and connecting the jumper pin to the external source. The SENSE input trip
points can be adjusted by changing the resistor dividers using the following equations:
Additionally, the SENSE4H input can be used along with V
REF
to monitor negative voltages applied at
J3/J1. J4 jumper must also be installed to the NEGVDC SNS4H position when monitoring negative
voltages. The onboard resistors have been chosen so that SENSE4H trips with approximately –4.2V at
J3/J1 for a –5VDC nominal power supply. The SENSE4H input trip points can be adjusted by changing
the resistor dividers using the following equations:
voltages. The onboard resistors have been chosen so that SENSE4H trips with approximately –4.2V at
J3/J1 for a –5VDC nominal power supply. The SENSE4H input trip points can be adjusted by changing
the resistor dividers using the following equations:
The EVM includes a PCB footprint for a small filter capacitor on each of the SENSE inputs for use with
noisy external sources.
noisy external sources.
8
Evaluation Module for TPS386000 and TPS386040
SLVU341 – October 2009
Copyright © 2009, Texas Instruments Incorporated