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| 型號： | TPS2459RHB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | PLASTIC, QFN-32 |
| 文件頁數(shù)： | 22/48頁 |
| 文件大小： | 852K |
| 代理商： | TPS2459RHB |
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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
SET
LIMIT
SENSE
SUM
0.675
R
I
13.83 A
R
=
LIMIT
INRUSH
I
0.6
I
0.6
13.83 A
8.3 A
=
=
=
(
)
LIMIT
SENSE
SUM
SET
I
R
857
0.675
=
W
SET
LIMIT
SENSE
SUM
0.675
R
I
16.75 A
R
=
LIMIT
INRUSH
I
0.5
I
0.5
16.75 A
8.38 A
=
=
=
www.ti.com
SLUS917D – FEBRUARY 2009 – REVISED MAY 2010
(7)
where
RSUM = 6810
RSENSE = 5
(8)
The closest 1% value is 698
(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.
(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 mF 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
RSUM = 6810
RSENSE = 5
(11)
The closest 1% value is 845
.
(12)
Neglecting the current slew time, charge the 1600-mF 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 13.
(13)
The new 8.38-A current limit is within the specification of 8.25 A ±10 %.
Note. These calculations use all nominal values.
Copyright 2009–2010, Texas Instruments Incorporated
29
Product Folder Link(s): TPS2459
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