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參數(shù)資料
| 型號： | TPS2343DDPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO80 |
| 封裝： | GREEN, PLASTIC, HTSSOP-80 |
| 文件頁數(shù)： | 16/42頁 |
| 文件大小： | 942K |
| 代理商： | TPS2343DDPR |
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TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
23
www.ti.com
APPLICATION INFORMATION
3.3 Volt or 1.55 Volt Supply for VIO
Overload trip point with MISET = 6.04 k
W.
Desired ITRIP(nom) = 4 A
R
SENSE +
V
TRIP(nom)
I
TRIP(nom)
+ 23.5 mV
4.0 A
+ 0.00598W
Choose 0.006
I
TRIP(min) +
20 mV
0.00612
W +
3.27 A
MIN
I
TRIP(max) +
27 mV
0.00588
W +
4.594 A
MIN
Thermal Shutdown
Under normal operating consitions, the power dissipation in the TS2343 is low enough that the junction
temperature (TJ) is not more than 15°C above air temperature (TA). However, in the case of a load that exceeds
PCI specifications (but remains under the TPS2343 overcurrent threshold) power dissipation can be higher. To
prevent any damage from an out-of-specification load or severe rise in ambient temperature, the TPS2343
contains two independent thermal shutdown circuits, one for each main supply slot. VAUX is not affected by the
thermal shutdown.
The highest power dissipation in the TPS2343 is from the 12-V power FET so that TPS2343 temperature sense
elements are integrated closely with these FETs. These sensors indicate when the temperature at these
transistors exceeds approximately 150
°C, due either to average device power dissipation, 12-V power FET
power dissipation, or a combination of both.
When excessive junction temperature is detected in one slot, that slot’s fault latch is set and remains set until
the junction temperature drops by approximately 10
°C and the slot is then restarted. The other slot is not
affected by this event.
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