參數(shù)資料
型號(hào)： TPS2306DWG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： SOIC-16
文件頁(yè)數(shù)： 11/29頁(yè)
文件大?。?/td> 427K
代理商： TPS2306DWG4
TPS2306
DUAL SEQUENCING HOT SWAP POWER MANAGER
SLVS368 APRIL 2001
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
If a desired maximum slew rate is known, it can be used to set the value of the soft-start cap, CSS. Since soft-start
is
i/t control, the required value of CSS can be determined by taking the derivative of equation 8 at time t = 0
and solving for CSS. The result is equation 10 below.
C
SSx +
IMAXx
R
IMAXx
i
t x
where:
(
i/t)x = the desired inrush slew rate of channel x
Continuing with the Figure 2 example, if the 5.0-V supply-current ramp is limited to 10 mA per microsecond, but
the 3.3-V input is capable of 100 mA per microsecond, the soft-start caps should be set to:
C
SS1 +
1.0 A
365
W
0.01
10*6
C
SS2 +
3.0 A
274
W
0.1
10*6
C
SS1 ^
0.27
mFC
SS2 ^
0.11
mF
Generally, selecting the next higher available value helps compensate for variations in the actual IMAX levels,
such that the
i/t does not exceed the design value, even for a hot swap solution operating at the high end of
its IMAX tolerance band.
programming the supply sequencing
The TPS2306 makes use of four on-chip comparators to control the ramp-up and ramp-down sequencing of
power delivery to the two loads. The UP1 and UP2 inputs are available to configure the ramp-up sequence of
Channels 1 and 2 respectively. The functional block diagram shows that the UPx comparators’ outputs switch
the internal current sources I1 and I2 to their respective IMAXx pins. In addition, they release disable inputs to
the LCAs, enabling LCA drive of the external FET gates.
Output turn-off is programmable via the DOWN1 and DOWN2 inputs. Again referring to the block diagram, when
the external enable signal is removed from the ENBL input, the DNx comparator outputs are gated to the LCA
control logic. When the voltage at either comparator input falls below the 0.5-V reference, that channel’s LCA
is disabled, removing the gate drive. A nominal 10-
A current source pulls the gate toward the GND pin
potential, ultimately turning off the external FET.
(10)
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