Introduction
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SLVUA44B – June 2014 – Revised July 2017
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TPS25940EVM-635: Evaluation Module for TPS25940X
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PWR635 Oscilloscope Settings for Current Limit Test
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10
PWR635 Jumper Setting for Current Limits
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TPS25940EVM-635 Bill of Material
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1
Introduction
The TPS25940XEVM allows reference circuit evaluation of TI's TPS25940X devices. The TPS25940X
devices are available with both latched and auto-retry operation.
1.1
EVM Features
•
2.7-V to 18.0-V (TYP) operation
–
CH1 rising input voltage turn-on threshold – 10.5 V (TYP)
–
CH1 falling input voltage turn-off threshold – 9.7 V (TYP)
–
CH2 rising input voltage turn-on threshold – 2.3 V (TYP)
–
CH2 falling input voltage turn-off threshold – 2.1 V (TYP)
•
0.6-A to 5.0-A programmable current limit
•
Programmable undervoltage lockout, overvoltage
•
Programmable V
OUT
slew rate
•
Latched-off TPS25940
L
RVC (CH2)
•
Auto-Retry TPS25940
A
RVC (CH1)
•
Pushbutton RESET signal
•
On-board transorb for overvoltage input protection
•
Schottky diode at output to minimize negative spike when load is removed
1.2
EVM Applications
•
Solid state drives and hard disk drives
•
PCIe, RAID, and NIC cards
•
USB power switch
•
Industrial
–
PLCs
–
Solid-state relays and FAN control
2
Description
The TPS25940EVM-635 enables full evaluation of the TPS25940X devices. The EVM supports two
versions (Auto-retry and Latched) of the devices on two Channels (CH1 and CH2, respectively). Input
power is applied at J3 (CH1) and J8 (CH2), while J2 (CH1)/J7 (CH2) provide the output connection to the
load, refer to the schematic in
Figure 1
, and test setup in
Figure 2
.
D5/C1 (CH1), D9/C7 (CH2) provides input protection for TPS25940X (U1 and U2, respectively) while
D4/C2/C3/C4 (CH1), D8/C8/C9/C10 (CH2) provides output protection.
Table 1. TPS25940X EVM Options and Default Setting
Part Number
EVM Function
V
IN
Range
UVLO
OVP
Current Limit
Fault Response
CH1
CH2
LO setting
No Jumper
HI Setting
CH1
CH2
TPS25940EVM-635
Current Limiter with DEVSLP
2.7 V–18 V
10.5 V
2.3 V (internal)
16.5 V
3.6 A
2.1 A
5.3 A
Auto-retry
Latched
S1 allows U1 and S2 allows U2 to be RESET or disabled. A power good (PG) indicator is provided by D3,
D6 for CH1 and CH2, respectively, and circuit faults can be observed with D2 and D6. Scaled channel
current can be monitored at TP11 and TP22 with a scale factor of 0.842 V/A.
