Texas Instruments eFuse TPS25983EVM Manuale utente
EVM User's Guide: TPS25983EVM TPS25983
Evaluation Module for TPS25983 eFuse
Description
The TPS25983EVM eFuse Evaluation Board allows
reference circuit evaluation of TI's TPS25983 eFuse.
The TPS25983 device is 2.7 V to 26 V, 18 A
eFuse with integrated 2.7 mOhm FET, programmable
undervoltage, overvoltage,overcurrent, inrush current
protection, and configurable number of autoretries
and retry delay features.
Features
• 2.7-V to 26-V (typ) operation
• 2 A to 20 A programmable current limit using
onboard jumpers
• Programmable output voltage slew rate control
• Configurable number of auto-retries and retry-
delay features
• Programmable current limit timer
• TVS diode for input transient protection
• On-board Schottky diode at output prevents
negative spike during overcurrent faults
• LED status indication for Power Good output
Applications
• Hot-Swap, Hot-Plug
• Server standby rails
• Optical Modules
• PCIe, SSDs and HDDs
• Routers and Switches
• Industrial PC
• Digital TV
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1 Evaluation Module Overview
1.1 Introduction
The TPS25983EVM eFuse Evaluation Board enables evaluation of TPS259830L eFuse from TPS25983 family.
The input power is applied between connectors J1 and J3 while J2 and J3 provides the output connection to the
load; refer to the schematic in Figure 3-1, and EVM test setup in Figure 2-1. D1/C1 provides input protection for
the TPS259830L eFuse while D2/C2 provides output protection.
S1 allows U1 to be RESET or disabled. A power good (PG) indicator is provided by D3. Scaled device current
can be monitored at TP15.
Table 1-1. TPS25983EVM eFuse Evaluation Board Options and Setting
Part Number EVM Function Vin Range Vin UVLO OV Cut-off Current Limit Fault Response
Low Setting Hi Setting
TPS25983EVM
eFuse Evaluation
Board
2.7 V to 26 V, 18 A
eFuse 2.7 V to 26 V 10.87 V 13.79 V 2 A 20 A
Configurable number
of auto-retries and
retry-delay
1.2 Kit Contents
Item Description Quantity
TPS25983EVM PCB 1
Box Cardboard BOX 1
Foam Antistatic Foam 2
Label Standard Label 1
Literature EVM Disclaimer Read Me 1
1.3 Specification
The TPS25983EVM eFuse Evaluation Board enables evaluation of TPS25983 eFuse from TPS25983 family.
• 2.7-V to 26-V (typ) operation
• 2 A to 20 A programmable current limit using onboard jumpers
• Programmable output voltage slew rate control
• Configurable number of auto-retries and retry-delay features
• Programmable current limit timer
• TVS diode for input transient protection
• On-board Schottky diode at output prevents negative spike during overcurrent faults
• LED status indication for Power Good output
1.4 Device Information
TPS259830L device is used on the EVM and is a current limit variant. This device has a dVdT pin that can
drive external FET, which helps in reverse current blocking when the device is off. TPS25983 eFuse is a highly
integrated circuit protection and power management device in a small package. The device is operational over
a wide input voltage range. The device is a robust defense against overloads, short-circuits, voltage surges,
reverse current and excessive inrush current.
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2 Hardware
2.1 Test Points and Connectors
Table 2-1 lists the TPS25983EVM eFuse Evaluation Board input and output connector functionality. Table 2-2
and Table 2-3 describe the test point availability and the jumper functionality. Table 2-4 describes the auto-retries
and retry-delay settings.
Table 2-1. Input and Output Connector Functionality
Connector Label Description
J1 VIN Power input connector to the positive rail of the input power supply.
J3 PGND Ground connection for the power supply.
J2 VOUT Power output connector to the positive side of the load.
J14 P-LOAD Placeholder for connecting load such as power resistor between J2 and J14.
Table 2-2. Test Points Description
Test Points Label Description
TP1 VIN Input power supply to the EVM
TP2 VOUT Output from the EVM
(Drain of Q3)
TP3 EN/UVP Active high enable and undervoltage input
TP4 VCC_EXT External power supply input for Power good pullup
TP5 PG Power good test point
TP6 DVOUT Output from the TPS25983
(Source of Q3)
TP7 PGND System ground
TP8 GND GND(IC GND)
TP9 GND GND(IC GND)
TP10 GND GND(IC GND)
TP11 ITIMER Fault timer voltage
TP12 ILIM Sets current limit threshold
TP13 RETRY_DLY Sets retry delay time
TP14 DVDT Output voltage ramp control
TP15 IMON Load current monitor
TP16 LOAD_ON Gate control for series MOSFET + Power load
TP17 PGND System ground
TP18 GATE Gate of external blocking FET Q3
TP19 OVLO Overvoltage lockout pin
Table 2-3. Jumper and LED Descriptions
Jumper Label Description
J4 NRETRY NRETRY setting number of auto-retries. Please refer Table 5 for details.
1-2 Position shorts to ground 3-4 Position sets 68 nF
J6 IMON Current scale setting
1-2 Position sets 0.13 V/A
3-4 Position sets 0.25 V/A
J7 PG Pull-Up PG Pull-Up voltage setting
1-2 Position sets external source “VCC_EXT”
3-4 Position sets 3.3 V
J8 VIN_UVLO 1-2 position connects UVLO pin to VIN resistor ladder.
J9 ITIMER ITIMER setting (sets delay before entering into current limit)
OPEN sets ‘0’sec delay
1-2 Position sets 200 µs delay
3-4 Position sets 2 ms delay
5-6 Position sets 20 ms delay
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Table 2-3. Jumper and LED Descriptions (continued)
Jumper Label Description
J10 ILIM Current limit setting 1-2 Position sets 2 A
3-4 Position sets 5 A
5-6 Position sets 18 A
7-8 Position sets 20 A
J11 RETRY_DLY Retry delay setting
OPEN sets 200 µs
1-2 Position sets “NO auto-retry” (latches OFF the device)
3-4 Position sets 1 s retry delay
5-6 Position sets 50 ms retry delay
J12 DVDT Output voltage slew rate setting
1-2 Position sets 1.5 V/ms
3-4 Position sets 0.5 V/ms
J13 VIN_OVLO 1-2 position connects OVLO pin to VIN resistor ladder
D3
(GREEN – LED)
D3 Power good indicator. LED turns on when the internal FET fully turns ON
Table 2-4. Auto-retries and Retry Delay Settings
RETRY_DLY
(J11 Position)
Retry Delay NRETRY
(J4 Position)
Number of Auto-Retries
OPEN 200 µs OPEN 4
1-2 Infinite
2-3 16
1-2 Position Latches OFF X 0
3-4 Position 1 s OPEN 4
1-2 Infinite
2-3 16
5-6 Position 50 ms OPEN 4
1-2 Infinite
2-3 64
2.2 Test Equipment and Set Up
2.2.1 Power Supplies
One adjustable power supply 0 V to 30 V output, 0 A to 30 A output current limit.
2.2.2 Meters
One DMM minimum needed.
2.2.3 Oscilloscope
A DPO2024 or equivalent, three 10x voltage probes, and a DC current probe.
2.2.4 Loads
One resistive load or equivalent which can tolerate up to 30 A DC load @ 24 V and capable of the output short.
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2.3 Test Setup and Procedures
In this user guide, the test procedure is described for TPS25983 device.
Make sure the evaluation board has default jumper settings as shown in Table 2-5.
Table 2-5. Default Jumper Setting for TPS25983EVM eFuse Evaluation Board
J4 J6 J7 J8 J9 J10 J11 J12 J13
Open 1-2 2-3 Install 3-4 5-6 Open 1-2 Install
Negative
Positive
Negative
Load
Positive
Power Supply
Voltmeter
PRINT
HELP
ALPHA
SHIFT
ENTER
RUN
D
GE
RF
I
A
JB
KC
L
7
M8
N9
O
D
GD
GD
G
D
G T 3
U
0
V.
WXYZ
TAB
% UTILIZATION
HUB/MAU NIC
2
BNC
4Mb/s
---
Oscilloscope
Figure 2-1. TPS25983EVM Setup with Test Equipment
Follow the below instructions before starting any test and repeat again before moving to next test.
• Set the power supply output (VIN) to zero volts.
• Turn ON the power supply and set the power supply output (VIN) to 12 V, current limit = 20 A.
• Turn OFF the power supply.
• Set the jumper setting on EVM to default position as shown in Table 2-5.
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2.3.1 Hot-Plug Test
Use the following instructions to measure the inrush current during Hot-Plug event.
1. For checking inrush current control capability, insert additional capacitance of 1800 uF at C16 terminals.
Total output capacitance = 1800 uF + 220 uF approx. 2 mF.
2. Set Jumper J12 in 3-4 position to set Cdvdt at 10 nF for o/p slew rate of 0.5 V/ms.
3. Set the input supply voltage VIN to 12 V and current limit of 5 A. Enable the power supply.
4. Hot-plug the supply between input connectors J1 and J3.
5. Observe the waveform at VOUT (TP2) with an oscilloscope to measure the slew rate and rise time of the
eFuse with a given input voltage of 12 V.
Figure 2-2 shows an example of inrush current captured on the TPS25983EVM eFuse Evaluation Board.
Figure 2-2. TPS25983 Output Rise Profile (VIN = 12 V, CdVdT = 10 nF, COUT = 2 mF, No-load)
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2.3.2 Current Limit Test
Use the following instructions to perform current limit test.
1. Place jumper J9 in 3-4 Position to set 2 ms for ITIMER.
2. Set the input supply voltage VIN to 12 V and current limit of 25 A and enable the power supply.
3. Place jumper J10 in 7-8 Position to set 18 A current limit.
4. Set the electronic load to 17 A and connect between VOUT and GND. Enable the electronic load.
5. Now apply overload of 7 A (using resistive load of 1.66 Ohm) between VOUT and GND.
6. The device allows the overload current for the programmed ITIMER period for example, 2 ms and then
switches OFF.
7. Place jumper J10 at other settings to test at various current limits.
Figure 2-3 shows an example of current limit at 18 A on the TPS25983EVM eFuse Evaluation Board.
Figure 2-3. Over Current Response of TPS25983 for 18 A Current Limit Setting
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2.3.3 Output Hot-Short Test
Use the following instructions to perform output Hot-Short test.
1. Set the input supply voltage VIN to 12 V and current limit of 15 A. Turn ON the power supply.
2. Short the output of the device for example, VOUT to GND with a shorter cable.
3. Observe the waveforms using an oscilloscope.
Figure 2-4 shows test waveform of output hot-short on the TPS25983EVM eFuse Evaluation Board.
Figure 2-4. Output Hot-Short Response of TPS25983 Device
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2.3.4 Wakeup into Short Test
Use the following instructions to perform wakeup into short test.
1. Set the input supply voltage VIN to 12 V and current limit of 10 A. Turn OFF the power supply.
2. Short the output of the device for example, VOUT to GND with a shorter cable.
3. Turn ON the power supply.
Figure 2-5 shows test waveform of wakeup into output short on the TPS25983EVM eFuse Evaluation Board.
Figure 2-5. Test Waveform of Wakeup Into Output Short for TPS25983 Device
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2.3.5 Overvoltage Cut-off Test
Use the following instructions to perform overvoltage protection test.
1. Remove input TVS diodes.
2. Set the input supply voltage VIN to 12 V and current limit of 5 A. Apply the supply between input connectors
J1 and J3 and enable the power supply.
3. Set the load resistance to 24 Ω and connect between VOUT and GND.
4. Increase the input supply VIN from 12 V to 18 V and observe the waveforms using an oscilloscope.
Figure 2-6 shows over voltage response of TPS25983 on TPS25983EVM eFuse Evaluation Board.
Figure 2-6. Over Voltage Protection Response of TPS25983 Device
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