SLVUCW7 September   2024 TPS1685

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 General Configurations
      1. 2.1.1 Physical Access
      2. 2.1.2 Test Equipment and Setup
        1. 2.1.2.1 Power Supplies
        2. 2.1.2.2 Meters
        3. 2.1.2.3 Oscilloscope
        4. 2.1.2.4 Loads
  8. 3Implementation Results
    1. 3.1 Test Setup and Procedures
      1. 3.1.1  Hot Plug
      2. 3.1.2  Start-up with Enable
      3. 3.1.3  Power Up Into Short
      4. 3.1.4  Undervoltage Lockout
      5. 3.1.5  Overvoltage Lockout
      6. 3.1.6  Transient Overload Performance
      7. 3.1.7  Overcurrent Event
      8. 3.1.8  Output Hot Short
      9. 3.1.9  Quick Output Discharge (QOD)
      10. 3.1.10 Thermal Performance of TPS1685EVM
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Drawings
    3. 4.3 Bill of Materials (BOM)
  10. 5Additional Information
    1. 5.1 Trademarks

2.1.1 Physical Access

The TPS1685EVMeFuse Evaluation Board input and output connectors functionalities are listed in 5. The availability of test points and the functionalities of the jumpers are described in 6 and 7. The function of the signal LED indicators is detailed in Table 2-4.

Table 2-1 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
T3PGND (–)Negative terminal for the EVM (Common for both input and output)
Table 2-2 Test Points Description
Test PointsLabelDescription
TP1VINInput voltage
TP2VOUTOutput voltage

TP3

EN

Active-high enable input

TP4

SWEN

Open-drain signal to indicate and control power switch ON and OFF status
TP5

OVP

Voltage at the OVP pin of the devices

TP6

TIMER

Overcurrent blanking timer

TP7

VDD1

Controller input power: primary device

TP8

TEMP

Maximum device die temperature monitor analog voltage output with two TPS1685 eFuses in parallel

TP9

MODE1

MODE selection: primary device

TP10

DVDT

Start-up output slew rate control

TP11

IREFReference voltage for overcurrent and amp; short-circuit protections, and active current-sharing blocks

TP12

ILIM1

Individual eFuse current monitor and active current sharing threshold under steady-state: primary device

TP13

ILIM2Individual eFuse current monitor and active current sharing threshold under steady-state: secondary device

TP14

IMON

Load current monitor and over-current and amp; fast-trip thresholds during steady state

TP15

SFT_SELScalable fast trip threshold multiplier during steady state

TP16

FLTb1

Open-drain active low fault indication: primary device

TP17

FLTb2

Open-drain active low fault indication: secondary device

TP18

PG

Open-drain active high power good indication

TP19

S1_P

Kelvin sensing points to measure primary eFuse ON resistance

TP20

S1_N

TP21

VDD Pullup

5V pullup power supply generated using a LDO from VIN

TP22

VDD2

Controller input power: secondary device

TP23

S2_P

Kelvin sensing points to measure secondary eFuse ON resistance

TP24

S2_N

QGND1, QGND2, QGND3, and QGND4

QGND

Device ground

G1, G2, G3, and G4

QGND

Device ground
Table 2-3 Jumper Descriptions and Default Positions
JumperLabelDescription

Default Jumper Position

J1

DVDT

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

3-4

3-4 Position sets the output slew rate to 0.5V/ms
5-6 Position sets the output slew rate to 0.1V/ms

J2

TIMER1-2 Position sets the overcurrent blanking timer to 3ms

3-4

3-4 Position sets the overcurrent blanking timer to 17ms

J3

IMON1-2 Position sets the circuit breaker threshold to 25A with VIREF of 1V

3-4

3-4 Position sets the circuit breaker threshold to 44A with VIREF of 1V

J4

ILIM1

1-2 Position sets the active current sharing threshold to 18A with VIREF of 1V: Primary Device

3-4

3-4 Position sets the active current sharing threshold to 24A with VIREF of 1V: Primary Device

J5

ILIM21-2 Position sets the active current sharing threshold to 18A with VIREF of 1V: Secondary Device

3-4

3-4 Position sets the active current sharing threshold to 24A with VIREF of 1V: Secondary Device

J6

IREF1-2 Position sets the reference voltage for over-current, short-circuit protection, and active current sharing blocks to 0.8V

3-4

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

J7

SFT_SEL

1-2 Position sets the scalable fast-trip threshold at 2.5 times over-current threshold

3-4

3-4 Position sets the scalable fast-trip threshold at 2 times over-current threshold
Table 2-4 LED Descriptions

LED

Description

DG1

When ON, indicates that PG is asserted

DR1

When ON, indicates that FLTb1 is asserted

DR2

When ON, indicates that FLTb2 is asserted