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參數(shù)資料
| 型號： | TPS2306EVM-001 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | TPS2306 Dual Sequencing Hot Swap Power Manager Evaluation Module and Interface Card(雙序列熱交換電源管理器件TPS2306的評估板與接口卡) |
| 中文描述： | TPS2306熱插拔雙測序電源管理評估模塊和接口卡（雙序列熱交換電源管理器件TPS2306的評估板與接口卡） |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 462K |
| 代理商： | TPS2306EVM-001 |
SLUU094
16
TPS2306 Dual Sequencing Hot Swap Power Manager
To modify the IMAX levels of the EVM, appropriate resistor values are determined using equation 5. For a
desired IMAXx value, the value of R3 or R4 (R
IMAXx
in the equation) is given by:
IMAXx
RSNSx
(1.1)
(1.5 V) R14
RIMAXx
Where:
IMAXx = the desired current level for Channel x, and
R
SNSx
= the value of that Channel
’
s current sense resistor
As an example, the Channel 1 IMAX current of the TPS2306 EVM, as supplied from the factory, is a nominal
2 A. Using equation 5, the value of R3 is found as follows:
R3
IMAX1
1.1
R1
1.5 V
R14
(2.0 )
1.1
(0.05
1.5 V
)
15 k
909
For additional details on setting the IMAX levels, refer to the TPS2306 device data sheet.
4.5
Optional Soft-Start With the TPS2306
The TPS2306 can be used with or without inrush soft-start. Without soft-start, when the output turn-on conditions
are met, the load currents virtually step to the programmed IMAX level, where they are limited during the start-up
transient. Once the loads
’
input bulk capacitance is charged to the input dc levels, the sourcing current tapers
to the steady-state load level. In this configuration, the TPS2306 provides constant-current charging of the
loads
’
capacitance. To test this mode of operation, the user should remove capacitors C3 (for Channel 1) and
C4 (for Channel 2).
Even with the current-limiting function provided by the internal LCA control, some power distribution systems
may still be sensitive to the di/dt event that occurs when the pass FETs are first turned on. For these applications,
inrush slew-rate control (soft-start) is easily implemented with the TPS2306, by installing capacitors in parallel
with the IMAX programming resistors. The TPS2306 EVM is designed to demonstrate the soft-start capability
of the device. Capacitors C3 and C4 are installed to program the slew rates to two very different curves. Adding
a capacitor in parallel with the IMAX resistor applies an RC time-constant to the reference voltage generation
at the IMAXx pins of the device. Due to the closed-loop control provided by the internal amplifiers during output
ramp-up, the load current supplied also ramps with a corresponding RC characteristic. For the TPS2306 EVM,
Channel 1 sourcing current has a time constant of only (0.056
μ
F) * (909
) = 51
μ
s, while the Channel 2 constant
is on the order of (1.2
μ
F) * (365
)
440
μ
s.
For additional information on establishing the inrush current profile, and a discussion about its effect on load
start-up times, refer to the device data sheet.
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