SLVUCB8A May   2022  – September 2022 TPS25985

 

  1.   TPS25985 evaluation module for eFuse User's Guide
  2.   Trademarks
  3. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 EVM Applications
  4. 2Description
  5. 3Schematic
  6. 4General Configurations
    1. 4.1 Physical Access
    2. 4.2 Test Equipment and Setup
      1. 4.2.1 Power supplies
      2. 4.2.2 Meters
      3. 4.2.3 Oscilloscope
      4. 4.2.4 Loads
  7. 5Test Setup and Procedures
    1. 5.1  Hot Plug
    2. 5.2  Start-up with Enable
    3. 5.3  Difference Between Current Limit and DVDT Based Start-up Mechanisms
    4. 5.4  Power-up into Short
    5. 5.5  Overvoltage Lockout
    6. 5.6  Transient Overload Performance
    7. 5.7  Overcurrent Event
    8. 5.8  Provision to Apply Load Transient and Overcurrent Event Using an Onboard Switching Circuit
    9. 5.9  Output Hot Short
    10. 5.10 PROCHOT# Implementation Using General-Purpose Comparator
    11. 5.11 Quick Output Discharge (QOD)
    12. 5.12 Thermal Performance of TPS25985EVM
  8. 6EVAL Board Assembly Drawings and Layout Guidelines
    1. 6.1 PCB Drawings
  9. 7Bill Of Materials (BOM)
  10. 8Revision History

4.1 Physical Access

Table 4-1 lists the TPS25985EVM eFuse Evaluation Board input and output connectors functionalities. Table 4-2 and Table 4-3 describe the availability of test points and the functionalities of the jumpers. Table 4-4 presents the function of the signal LED indicators.

Table 4-1 Input and Output Connector Functionality
ConnectorLabelDescription
T1VIN (+)Positive terminal for the input power to the EVM
T2VOUT (+)Positive terminal for the output power from the EVM

T3

PGND (–)Negative terminal for the EVM (Common for both input and output)
Table 4-2 Test Points Description
Test PointsLabelDescription
TP1S1_PKelvin sensing points to measure

  • Combined on-resistance with both TPS25985 eFuses enabled

  • On-resistance of the primary device (U1) when the secondary device (U2) disabled

TP2S1_N
TP3VINInput Voltage
TP4VOUTOutput Voltage
TP5OPTIONALUsed to implement system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc. using the built-in general-purpose comparator

TP6

OPTIONAL

Used to implement system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc. using the built-in general-purpose comparator
TP7

OPTIONAL

Used to implement system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc. using the built-in general-purpose comparator

TP8

MODE2

MODE selection: Secondary Device

TP9

FLTb2

Open-drain active low fault indication: Secondary Device

TP10

VDD-PRI

Controller input power: Primary Device

TP11

FLTb

Open-drain active low fault indication: Primary Device

TP12

SWEN

Open-drain signal to indicate and control power switch ON and OFF status

TP13

OPTIONALUsed to implement system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc. using the built-in general-purpose comparator

TP14

TEMP

Maximum device die temperature monitor analog voltage output with two (2) TPS25985 eFuses in parallel

TP15

CMPMGeneral-purpose comparator negative input: Primary Device

TP16

CMPM2

General-purpose comparator negative input: Secondary Device

TP17

CMPPGeneral-purpose comparator positive input: Primary Device

TP18

OPTIONAL

Used to implement system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc. using the built-in general-purpose comparator

TP19

CMPP2

General-purpose comparator positive input: Secondary Device

TP20

OPTIONAL

Used to implement system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc. using the built-in general-purpose comparator

TP21

CMPOUT

General-purpose comparator open-drain output: Primary Device

TP22

OPTIONAL

Used to implement system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc. using the built-in general-purpose comparator

TP23

CMPOUT2

General-purpose comparator open-drain output: Secondary Device

TP24

OPTIONAL

Used to implement system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc. using the built-in general-purpose comparator

TP25

DVDT

Start-up output slew rate control

TP26

ITIMER

Overcurrent blanking timer

TP27

IMON

Load current monitor and overcurrent & fast-trip thresholds during steady state

TP28

ILIM2

Current limit and fast-trip threshold during start-up: Secondary Device

TP29

ILIM

Current limit and fast-trip threshold during start-up: Primary Device

TP30

IREF

Reference voltage for overcurrent & short-circuit protections, and active current sharing blocks

TP31

MODE

MODE selection: Primary Device

TP32

PG

Open-drain active high power good indication

TP33

EN

Active high enable input

TP34

VDD-SEC

Controller input power: Secondary Device

TP35

+5V Pullup

5 V pullup power supply generated using a LDO from VIN

TP36

+1.2V Reference

Used to implement system level functionalities such as adjustable overvoltage protection, PROCHOT#™, load handshake, power good with adjustable thresholds, etc. using the built-in general-purpose comparator

TP37

VCC EXTERNAL

External pullup power supply

TP38

GD EXTERNAL

External gate signal for custom load transient

TP39

PGND

Supply ground

QGND1

QGND

Device ground

G1

QGND

Device ground

G2

QGND

Device ground
Table 4-3 Jumper Descriptions and Default Positions
JumperLabelDescription

Default Jumper Position

J1

SWEN1-2 Position: The SWEN pullup supply is generated from VIN using a Zener diode (RZ2 populated & RZ3 depopulated) or using a LDO (RZ2 depopulated & RZ3 populated)

1-2

2-3 Position: The SWEN pin is connected to the ITIMER pin of the Primary Device through a 100-kΩ resistor

J2

DVDT

1-2 Position sets the output slew rate to 1.8-V/ms

5-6

3-4 Position sets the output slew rate to 12-V/ms
5-6 Position sets the output slew rate to 1.2-V/ms

J3

ITIMER1-2 Position sets the overcurrent blanking timer to 1.4-ms

3-4

3-4 Position sets the overcurrent blanking timer to 14-ms

J4

IMON1-2 Position sets the circuit breaker threshold to 100-A with VIREF of 1-V

1-2

3-4 Position sets the circuit breaker threshold to 70-A with VIREF of 1-V

J5

ILIM

1-2 Position sets the inrush current limit to 32-A and the active current sharing threshold to 50-A with VIREF of 1-V: Primary Device

1-2

3-4 Position sets the inrush current limit to 22-A and the active current sharing threshold to 35-A with VIREF of 1-V: Primary Device

J6

IREF

1-2 Position sets the reference voltage for overcurrent, short-circuit protection, and active current sharing blocks to 0.8-V

3-4

3-4 Position sets the reference voltage for overcurrent, short-circuit protection, and active current sharing blocks to 1-V

J7

ILIM2

1-2 Position sets the inrush current limit to 32-A and the active current sharing threshold to 50-A with VIREF of 1-V: Secondary Device

1-2

3-4 Position sets the inrush current limit to 22-A and the active current sharing threshold to 35-A with VIREF of 1-V: Secondary Device

J8

VDD PULLUP POWER SUPPLY

1-2 Position provides the VDD pullup supply from the external power source

2-3

2-3 Position provides the VDD pullup supply from the onboard 12-V to 5-V LDO

J9

EXTERNAL GATE SIGNAL

1-2 Position provides the GATE signal to the MOSFETs (Q7 – Q9) from the onboard monoshot

1-2

2-3 Position provides the GATE signal to the MOSFETs (Q7 – Q9) from the external signal generator
Table 4-4 LED Descriptions

LED

Description

DG1

When ON, indicates that PG is asserted

DR1

When ON, indicates that FLTb is asserted

DR2

When ON, indicates that FLTb2 is asserted