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參數(shù)資料
| 型號(hào)： | 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)： | 25/42頁 |
| 文件大?。?/td> | 942K |
| 代理商： | TPS2343DDPR |
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TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
31
www.ti.com
APPLICATION INFORMATION
VIO Power Selection
PCIX Local Bus specification revision 2.0 requires that VIO be 3.3 V when the slot is operating in 33-MHz,
66-MHz, or 133-MHz modes and 1.5 V when the slot is operating in 266-MHz or 533-MHz modes. The TPS2343
provides signals to drive external power FETs to select between 3.3 V and 1.5 V for VIO.
To prevent body-diode conduction from the 3.3-V supply to the 1.5-V supply when 3.3 V is delivered to VIO, the
1.5-V VIO switch uses two power FETs in blocking-series connection. To minimize voltage loss, low
on-resistance FETs are required (such as IRF1302S or Si4430DY). It is helpful to anticipate the voltage drop
in the FETs and adjust the 1.5-V VIO power source for slightly greater than 1.5 V, for example 1.55 V
±25 mV.
6m
W
15VIOG
3VIOG
VIOIS
VIOS
1.55V
3.3V
+
To
Slot
VIO
10
m A
10
m A
IRF1302S
or Si4430DY
IRF7460 or
Si4410DY
23mV
22 nF
Figure 6. VIO Application Diagram (one slot shown)
When PWREN is asserted, depending on VIOSEL, either 15VIOG or 3VIOG ramps up concurrently with the
other main power supplies. When PWREN is deasserted, 15VIOG or 3VIOG ramps down concurrently with the
other main power supplies.
Gate slewing caps are used on the VIO channels. One cap is used for the 3VIOGx and another for the 15VIOGx
in order to set the slew rate properly for a 1.5-V or 3.3-V channel. There is only one charging current on VIO
which is set at 10
A and switched between the two pins depending on the VIOSELx input.
PCI specifications limit adapter card VIO capacitance to 150
F. It is recommended that the backplane also have
between 10
F and 50 F of bypass capacitance on VIO to minimize transients. The capacitance on each gate
is 22 nF, producing a gate slew rate of approximately 0.45 V/ms. The averagelimits VIO capacitive inrush current
is approximately 68 mA.
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