參數(shù)資料
型號(hào)： TPS2345PWNRND
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： GREEN, TSSOP-24
文件頁(yè)數(shù)： 18/32頁(yè)
文件大?。?/td> 621K
代理商： TPS2345PWNRND
TPS2345
SLUS503B – MARCH 2002 – REVISED AUGUST 2002
25
www.ti.com
APPLICATION INFORMATION
Due to the potential three-phase nature of the load current ramp (refer to Figure 20), the increasing load voltage
may also have three distinct periods. The first phase is during the slow turn-on period at the start of each IRAMP
cycle. Depending on a number of factors, significant voltage ramping may or may not occur during this time.
Also, any appreciable voltage ramp is more likely on the 3.3-V and 5-V loads. For verification of the fault timeout
delay, the worst case situation is no appreciable load charging (i.e., a longer overall charge time); therefore it
is assumed that no voltage ramp occurs here.
The next phase is the linear load current ramp period. For any device channel x, if the IMAX level is not reached
while charging a given load capacitor of CLx, then the time to reach the input dc level, VINx, is estimated by
equation (9).
t
SSx +
2
C
Lx
C
IRAMP
K
X
R
SNSx
V
INx
58
mA
where:
KX = 67.5 for Channels 1, 2, and 3, and
KX = 7.5 for Channel 4.
For example, assuming the 5-V back-end plane in this application has 220-
F bulk capacitance, the anticipated
typical ramp-up time is about 1.6 ms.
During inrush slewing, the load current ramp tracks the voltage ramp on the IRAMP capacitor, up to a voltage
of about 1.35 V on the IRAMP pin. Therefore, the time duration of this ramp activity, tIRAMP, is given by
equation (10).
t
IRAMP +
C
IRAMP
(1.25 V)
58
where:
CIRAMP is in microfarads.
If, for any channel, the time for soft-start charging of the load voltage is greater than the current ramp period,
(tSSx > tIRAMP), back-end plane ramp-up completes at the dc IMAX level. In this case, the following procedure
can be used to estimate load ramp-up time.
First, equation (11) is used to determine the load voltage level, vLx(t), attained during the current ramp period.
v
Lx tIRAMP +
58
mA
2
C
Lx
C
IRAMP
K
X
R
SNSx
t
IRAMP
2
Once this voltage level is known, it can be used to estimate the additional charging time required at constant
current to reach the input dc potential, tCCx. This time is calculated from equation (12).
t
CCx +
C
Lx
V
INx * VLx tIRAMP
IMAXx
The sum of tIRAMP and tCCx can then be used to estimate the total load ramp-up time for Channel x.
(9)
(10)
(11)
(12)
相關(guān)PDF資料
PDF描述
TPS2346PWG4 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
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