參數(shù)資料
型號(hào)： TPS2459RHBR
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32
封裝： PLASTIC, QFP-32
文件頁(yè)數(shù)： 21/44頁(yè)
文件大小： 983K
代理商： TPS2459RHBR
PRODUCTPREVIEW
CHARGE
C V
1600 F 12 V
I
6.4 A
t
0.003 s
m
=
LOAD
P
80 W
I
6.67 A
V
12 V
=
(
)
LIMIT
SENSE
SUM
SET
I
R
691
0.675
=
W
(8)
SET
LIMIT
SENSE
SUM
0.675 R
I
13.83 A
R
=
(9)
LIMIT
INRUSH
I
0.6 I
0.6 13.83 A
8.3 A
=
=
=
(10)
(
)
LIMIT
SENSE
SUM
SET
I
R
857
0.675
=
W
SET
LIMIT
SENSE
SUM
0.675 R
I
16.75 A
R
=
(11)
LIMIT
INRUSH
I
0.5 I
0.5 16.75 A
8.38 A
=
=
=
(12)
SLUS917 – FEBRUARY 2009 ............................................................................................................................................................................................ www.ti.com
Next, use Equation 8 to calculate RSET for an ILIMIT of 13.7 A.
where
R
SUM = 6810
R
SENSE = 5
The closest 1% value is 698
. The ILIMIT can be calculated in Equation 9.
If R3[3:0] are set to 0111 and R6[4] = 1 the current limit drops to 60% of the programmed maximum after
dropping out of current limit following inrush. The operational current limit is calcualted in Equation 10.
The new 8.38-A current limit is within the specification of 8.25 A ±10 %. Note. These calculations use all nominal
values and neglect di/dt rates at turn on.
Example Two
Set up 12-A to startup into an 80-W load and charge a 1600
F at not more than 17-A nominal. Then drop to an
operational ILIMIT of 8.25 A ±10%.
ISTARTUP = 17 A
The correct RSET must be found to set maximum ILIMIT to less than 17 A.
where
R
SUM = 6810
R
SENSE = 5
The closest 1% value is 845
.
Neglecting the current slew time, charge the 1600-
F capacitor in 1.9 ms.
If R3[3:0] are set to 0101 and R6[4] = 1 the current limit drops to 50% of the programmed maximum after
dropping out of current limit following inrush. The operational current limit is calculated in Equation 12.
The new 8.38-A current limit is within the specification of 8.25 A ±10 %.
Note. These calculations use all nominal values.
28
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS2459
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