參數(shù)資料
型號(hào)： TPS2346PWTR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
封裝： TSSOP-24
文件頁(yè)數(shù)： 16/30頁(yè)
文件大小： 490K
代理商： TPS2346PWTR
TPS2346
SLUS529 – MAY 2002
23
www.ti.com
APPLICATION INFORMATION
When setting the current limits, it is important to consider the device minimum that may be imposed by the
TPS2346. Using the values given in the electrical tables, equations (2) and (3) follow from equation (1).
For Channels 1, 2 and 3:
R
SNSx +
16 mV
IMAXx
where:
x = 1, 2 or 3.
For Channel 4:
R
SNS4 +
75 mV
IMAX4
To ensure proper operation across the range of anticipated load currents on each channel, the maximum load
under normal operating conditions must also be considered. To avoid current-limit operation during steady-state
loading, the IMAX level must be set above the expected load. For example, if the 5-V (Channel 2) and 3.3-V
(Channel 3) supplies of the typical application diagram each need to deliver up to 7.5 A, and a 500-mA margin
is desired, using equation (2) yields:
R2
+ R3 + 16 mV
8A
+ 2mW
Similarly, for up to 5-A capability on Channel 1, equation (2) indicates R1
` 3 m. Setting R4 = 200 m, provides
some margin over a 250 mA load.
setting the inrush slew rate
The TPS2346 is easily programmed for the desired maximum current slew rate during turn-on and turn-off
events. A single capacitor at the IRAMP pin (C2 in the diagram) controls the di/dt for all three positive channels.
Once the sense resistor values have been established, the value for CIRAMP, in microfarads, can be determined
from equation (4).
For Channels 1, 2, and 3:
C
IRAMPx +
68
67.5
R
SNSx
di
dt x
where:
CIRAMPx = the capacitor value indicated to achieve the (di/dt)x limit value,
RSNSx = sense resistor in ohms and
(di/dt)x = the maximum di/dt rate, in amps/second.
(2)
(3)
(4)
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