Texas Instruments TPS25921XEVM-637 User Manual
User's Guide
SLUUB50–August 2014
TPS25921X-637EVM: Evaluation Module for TPS25921X
This user’s guide describes the evaluation module (EVM) for the TPS25921. The TPS25921X is an eFuse
with precision current limit, 4.5-V to 18-V supply voltage operation, programmable undervoltage,
overvoltage, overcurrent and inrush current protection features.
Contents
1 Introduction ................................................................................................................... 2
1.1 EVM Features....................................................................................................... 2
1.2 EVM Applications................................................................................................... 2
2 Description.................................................................................................................... 3
3 Schematics ................................................................................................................... 4
4 General Configurations ..................................................................................................... 5
4.1 Physical Access..................................................................................................... 5
4.2 Test Equipment and Setup ....................................................................................... 6
4.3 Test Setup and Procedures ....................................................................................... 7
5 EVM Assembly Drawings and Layout Guidelines...................................................................... 11
5.1 PCB Drawings ..................................................................................................... 11
6 Bill of Materials (BOM)..................................................................................................... 14
List of Figures
1 TPS25921X EVM Schematic............................................................................................... 4
2 EVM Setup with Test Equipment .......................................................................................... 7
3 J3= No Jumper Current Limit (1.5 A) Test Auto Retry (CH1) ........................................................ 10
4 J7 = No Jumper Current Limit (1.5A) Test with Latch (CH2)......................................................... 10
5 Top Side Placement ....................................................................................................... 11
6 Top Layer ................................................................................................................... 12
7 Bottom Layer................................................................................................................ 13
List of Tables
1 TPS25921X EVM Options and Settings .................................................................................. 3
2 Input and Output Connector Functionality................................................................................ 5
3 Test Points Description ..................................................................................................... 5
4 Jumper and LEDs Descriptions............................................................................................ 6
5 Power Supply Setting for PWR637........................................................................................ 8
6 Default Jumper Setting for PWR637 ...................................................................................... 8
7 PWR637 DMM Readings at Different Test Points....................................................................... 8
8 PWR637 Oscilloscope Setting for Current Limit Test................................................................... 9
9 PWR637 Jumper Settings for Current Limits ............................................................................ 9
10 TPS25921XEVM-637 Bill of Materials .................................................................................. 14
SLUUB50–August 2014 TPS25921X-637EVM: Evaluation Module for TPS25921X
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
1
Introduction
1 Introduction
The TPS25921XEVM allows reference circuit evaluation of TI's TPS25921X devices. The TPS25921X
devices are available with both latching and auto-retry operation.
1.1 EVM Features
• General TPS25921XEVM features include:
– 4.5-V to 18.0-V (TYP) operation
• CH1 Rising input voltage turn-on threshold – 4.5 V (TYP)
• CH1 rising input voltage turn-off threshold (OVP) – 17 V (TYP)
• CH1 Falling Input voltage turn-off threshold (UVLO) –4.2 V (TYP)
• CH2 Rising Input voltage turn-on threshold – 4.5 V (TYP)
• CH2 Rising Input voltage turn-off threshold (OVP) – 17 V (TYP)
• CH2 Falling Input voltage turn-off threshold (UVLO) – 4.2 V (TYP)
– 0.5-A to 1.5-A programmable current limit
– Programmable undervoltage lockout/overvoltage
– Programmable VOUT slew rate
– Latched-off TPS25921LD
– Auto-retry TPS25921AD
• Push button RESET signal
• On-board transorb is for overvoltage input protection
• Common diode at output prevents a negative spike when the load is removed
www.ti.com
1.2 EVM Applications
• Set-top boxes, DVD and Blu-ray™ units
• HDD and SSD drives
• Thunderbolt host ports
• Hot-swap boards
• PCI/PCIe cards
• White goods/appliances
• Servers
Blu-ray is a trademark of Blu-ray Disc Association.
All other trademarks are the property of their respective owners.
2
TPS25921X-637EVM: Evaluation Module for TPS25921X SLUUB50–August 2014
Copyright © 2014, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
2 Description
The TPS25921XEVM-637 enables full evaluation of the TPS25921X 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 J1 (CH1) and, J5 (CH2) while J2 and (CH1)/J6 (CH2) provide the output connection to
the load. Refer to the schematic in Figure 1, and EVM test setup in Figure 2.
D1/C1(CH1), D5/C9 (CH2) provide input protection for the TPS25921X (U1 and U2, respectively) while
D2/C2-C6 (CH1), D6/C10-C14 (CH2) provide output protection and inrush current demand from the load.
S1 and S2 allow U1 and U2, respectively, to be RESET or disabled. A power good (PG) indicator is
provided by D3, D7 for CH1 and CH2, respectively, and circuit faults can be observed with D4. Scaled
channel current can be monitored at TP10 and TP20 with a scale factor of approximately 1 V/A.
Description
Table 1. TPS25921X EVM Options and Settings
Part Number EVM Function OVP
TPS25921XE 4.5 V–18 Auto-
VM-637 V retry
eFuse with
Precision Current 4.2 V 4.2 V 17 V 0.5 A 1.5 A 1:00 AM Latched
Limit
VIN
Range
UVLO Current Limit Fault Response
CH1 CH2 Lo Setting CH1 CH2
No Middle
Jumper Setting
SLUUB50–August 2014 TPS25921X-637EVM: Evaluation Module for TPS25921X
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
3
S1
4.7µF
C5
4.7µF
C3
0.1µF
C2
TP6
VIN1
TP8
TP5
VOUT1
TP3
EN1
TP10
ILIM1
TP7
TP1
1000pF
C7
D1
COMMON GROUND
VIN1
FAULT1
1
2
3
J3
TP4
FLTb1
1000pF
C8
0.47µF
C1
VOUT-1=4.5V-18V
IOUT-1=0.4A -1.6A
Red
D3
D2
J2
J1
4.7µF
C4
TP2
GND
1
SS
2
EN/UVLO
3
VIN4OUT
5
FLTb
6
ILIM
7
OVP
8
U1
TPS25921AD
100k
R1
12.1k
R6
24.9k
R3
DNP
95.3k
R2
45.3k
R4
S2
34.8k
R14
4.7µF
C13
4.7µF
C11
0.1µF
C10
TP19
VIN2
TP11
TP18
VOUT2
TP16
EN2
TP20
ILIM2
TP13
TP12
1000pF
C15
D5
COMMON GROUND
VIN2
FAULT2
45.3k
R15
1
2
3
J7
TP17
FLTb2
1000pF
C16
100k
R11
0.47µF
C9
95.3k
R12
VIN=4.5V-18V
IIN=0.4A-1.6A
VOUT-2=4.5V-18V
IOUT-2=0.4A -1.6A
Red
D7
D6
J6
J5
24.9k
R13
DNP
4.7µF
C12
TP21
GND
1
SS
2
EN/UVLO
3
VIN4OUT
5
FLTb
6
ILIM
7
OVP
8
U2
TPS25921LD
VOUT2
123
J4
330µF
C14
330µF
C6
34.8k
R5
12.1k
R16
24.3k
R17
24.3k
R7
0.1
R10
TP14
P-LOAD
P-LOAD-RTN
ON
TP15
I-LOAD
TP9
Green
D4
100k
R9
10.0k
R8
VOUT1
VIN=4.5V-18V
IIN=0.4A-1.6A
TP22
OVP1
TP23
OVP2
1000pF
C17
1000pF
C18
VOUT1VOUT2
4
7,8
1,2,3
5,6,
Q1
Schematics
3 Schematics
Figure 1 illustrates the schematic for this EVM.
4
TPS25921X-637EVM: Evaluation Module for TPS25921X SLUUB50–August 2014
www.ti.com
Figure 1. TPS25921X EVM Schematic
Copyright © 2014, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
4 General Configurations
This section describes the physical access, test equipment and set up, and the test setup and procedures
for this EVM.
4.1 Physical Access
Table 2 lists the TPS25921XEVM-637 input and output connector functionality.
Table 2. Input and Output Connector Functionality
Connector Label Description
J1 CH1 VIN1(+), GND(–) CH1 Input power supply to the EVM
J2 VOUT1(+),GND(–) CH1 Output power from the EVM
J5 CH2 VIN2(+), GND(–) CH2 Input power supply to the EVM
J6 VOUT2(+),GND(–) CH2 Output power from the EVM
Table 3 describes the test point availability.
Channel Test Points Label Description
CH1 TP6 VIN1 CH1 Input power supply to the EVM
TP3 EN1 CH1 Active high enable and under voltage input
TP22 OVP1 CH1, Active high overvoltage input
TP10 IMON1 CH1 Current monitor. Load current ≈1 × voltage on TP10
TP5 VOUT1 CH1 Output from the EVM
TP4 FLTb1 CH1, Fault test point
TP1 GND GND
TP2 GND GND
TP7 GND GND
TP8 GND GND
CH2 TP19 VIN2 CH2 Input power supply to the EVM
TP16 EN2 CH2 Active high enable and under voltage input
TP23 OVP2 CH2, Active high overvoltage input
TP20 IMON2 CH2 Current monitor. Load current ≈1 × voltage on TP20
TP18 VOUT2 CH2 Output from the EVM
TP20 FLTb2 CH2, Fault test point
TP11 GND GND
TP12 GND GND
TP13 GND GND
TP21 GND GND
General Configurations
Table 3. Test Points Description
SLUUB50–August 2014 TPS25921X-637EVM: Evaluation Module for TPS25921X
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
5
General Configurations
Table 4 describes the jumper functionality.
Jumper Label Description
J3 0.5 A−1.0 A CH1 current setting (no jumper sets 1.5 A)
J7 0.5 A−1.0 A CH2 current setting (no jumper sets 1.5 A)
D3 (Red) D2 CH1 circuit fault indicator. LED turns on when the internal MOSFET is disabled due to a fault
D7 (Red) D3 CH2 circuit fault indicator. LED turns on when the internal MOSFET is disabled due to a fault
D4 (Green) D4
condition such as overload, short circuit, or undervoltage and so forth.
condition such as overload, short circuit, or undervoltage and so forth.
CH1 and CH2 power good indicator.
This LED turns on from:
VOUT1, if the jumper is installed in position 2-3
VOUT2, if the jumper is installed in position 1-2
4.2 Test Equipment and Setup
4.2.1 Power Supplies
One adjustable power supply: 0- to 20-V output, 0- to 3-A output current limit.
4.2.2 Meters
One DMM minimum needed and may require more, if simultaneous measurements are needed.
www.ti.com
Table 4. Jumper and LEDs Descriptions
4.2.3 Oscilloscope
A DPO2024 or Lecroy 424 oscilloscope or equivalent, three 10X voltage probes, and a DC current probe
4.2.4 Loads
One resistive load or equivalent which can tolerate up to 3 ADC load at 12 V and are capable of the
output short.
6
TPS25921X-637EVM: Evaluation Module for TPS25921X SLUUB50–August 2014
Copyright © 2014, Texas Instruments Incorporated
Submit Documentation Feedback
Loading...