TPS2346PWRG4【PDF 23/30 页】IC HOT SWAP POWER MGR 24-TSSOP

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Sheet目录47

19页 20页 21页 22页 [23页]24页 25页 26页 27页

TPS2346

SLUS529 MAY 2002

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:

SNSx

16 mV

IMAXx

where:

x = 1, 2 or 3.

For Channel 4:

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

8 A

+ 2 mW

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 C

IRAMP

, in microfarads, can be determined

from equation (4).

For Channels 1, 2, and 3:

IRAMPx

67.5 R

SNSx

where:

IRAMPx

= the capacitor value indicated to achieve the (di/dt)x limit value,

SNSx

= sense resistor in ohms and

(di/dt)

= the maximum di/dt rate, in amps/second.

(2)

(3)

(4)

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