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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)： | 18/42頁 |
| 文件大?。?/td> | 942K |
| 代理商： | TPS2343DDPR |
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TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
25
www.ti.com
APPLICATION INFORMATION
MOSFET Selection
All external power MOSFETs are N-channel devices. Gate resistors are not required.
Hot plug can cause excessive voltage spikes on the input and output of the FET. During a short circuit, an
excessive current spike can occur before current limit turns off the output. Although the duration is usually very
small, the energy can be large and cause big voltage fluctuations. The MOSFET will operate at high current and
high drain to source voltage which could violate the safe operating area of the device and cause breakdown.
To ensure safe operation of the external MOSFET, the drain-to-source voltage rating should be reasonably
higher than VIN. A 2-to-1 or 3-to-1 ratio of the VDSS to VIN is recommended.
VDSS > 2 x VIN
The current rating of the FET at the maximum case temperature (usually 70
°C 100°C), ID, should be at least
2 x ITRIP(max) (see RSENSE Calculations Section).
ID at TC(max) > 2 x ITRIP(max)
The gate-to-source voltage rating, VGS of the FET should be at least 10 V because the TPS2343 gate voltages
can be as high as 12 V and the source voltage as low as 3.3 V, a difference of 8.7 V.
VGS > 10 V
Another important parameter in choosing a FET is the on-resistance, RDS(on). The lower the RDS(on), the smaller
the power dissipation of the FET and the easier to maintain the PCI recommended bus voltage. The lowest
RDS(on) FETs are the most expensive. To calculate the FET RDS(on), note the lower limit for each slot voltage
specified in the PCIX Electrical and Mechanical Addendum.
Table 2.
SUPPLY VOLTAGE
PCI TOLERANCE
SUPPLY TOLERANCE
MAXIMUM OPERATING CUR-
RENT
+5 V
±0.25 V
±3%
5.0 A
+3.3 V
±0.3 V
±3%
7.6 A
VIO = 3.3
±0.3 V
±3%
3.5 A
VIO = 1.5
±0.075 V
±3%
1.5 A
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