Texas Instruments Evaluation Module for TPS2393 Positive High-Voltage Power-Limiting Hotswap Controller TPS2493EVM-004 TPS2493EVM-004 Scheda Tecnica
Codici prodotto
TPS2493EVM-004
Description
2.3
Equipment supplied
•
EVM-491
•
The datasheet and this users guide is available on the TPS2492/3 product page at
www.ti.com
.
2.4
Equipment Required
•
Power Supply is able to output twice the steady state current for pulse duration. For the 12-V factory
set EVM, steady state power is 25-A nominal.
set EVM, steady state power is 25-A nominal.
•
Oscilloscope
•
Current Probe
2.5
EVM Documentation
The manufacturing and engineering documentation for the EVM is shown in sections 3 to 6. The EVM is
orderable in 12-V or 48-V configurations, latched off or retry on fault.
orderable in 12-V or 48-V configurations, latched off or retry on fault.
2.6
EVM Configuration
Components may be changed for operation at voltage or current not configured as supplied. The List of
Materials, , shows the parts to change to configure the EVM to 48 V at 5-A operation. Configure the circuit
board for other operating current to 50 A maximum. Changing the sense resistor, the power limit
programming components, and possibly the number of MOSFETs as required.
Materials, , shows the parts to change to configure the EVM to 48 V at 5-A operation. Configure the circuit
board for other operating current to 50 A maximum. Changing the sense resistor, the power limit
programming components, and possibly the number of MOSFETs as required.
Use the List of Material as a guide when changing module configurations. The TPS2492/93 datasheet has
design example describing how to select parts based on specifications. A calculator tool is also available
from the product page at
design example describing how to select parts based on specifications. A calculator tool is also available
from the product page at
www.ti.com
.
2.7
Other EVM Options
There are EVM options not described in the other TPS2492/3 documentation. These are described in this
section. They involve the not populated components of the EVM.
section. They involve the not populated components of the EVM.
2.7.1
Trip Point Trim Resistors
R15 and R16 are added to fine tune the sense current when the required current cannot be achieved with
standard sense resistors. These resistors form a divider across the sense main sense resistor to increase
the trip point from the main sense setting. These are low power rated components. They should be kept
below 100
standard sense resistors. These resistors form a divider across the sense main sense resistor to increase
the trip point from the main sense setting. These are low power rated components. They should be kept
below 100
Ω
to minimize the set point error.
For example, to select 30 A nominal,
•
Bracket the setpoint. A 0.001-
Ω
sense resistor selects 50 A and a 0.002
Ω
selects 25 A.
•
Use the larger value sense resistor. In this case 0.002
Ω
.
•
At 30 A, the voltage across the 0.002-
Ω
sense resistor is 60 mV.
•
R15 and R16 make a standard voltage divider. Use the formula (60 mV x R16) / (R15 + R16) = 50 mV.
•
Let R16 = 33
Ω
, solve for R15. In this case, R15 = 6.6
Ω
, use standard value R = 6.55
Ω
.
3
SLUU425A
–
May 2010
–
Revised March 2011
Using the TPS2492/3 Hot Swap Controller
Copyright
©
2010
–
2011, Texas Instruments Incorporated