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參數(shù)資料
| 型號(hào)： | TPS2343DDPG3 |
| 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)： | 6/42頁 |
| 文件大?。?/td> | 942K |
| 代理商： | TPS2343DDPG3 |
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TPS2343
SLUS644B FEBRUARY 2005 MAY 2005
14
www.ti.com
APPLICATION INFORMATION
Turn-On Sequence
Main power to the slot turns on when all input supplies are active and power is commanded, by asserting
PWRENx. The charge pump combined with the P12VGx capacitor produces a linear voltage ramp on P12VGx,
which produces a linear ramping of the 12-V output and the 12-V output. At the same time, a current source
on 5VG combined with the 5VG capacitor produces a linear voltage ramp on 5VG and a current source on 3VG
combined with the 3VG capacitor produces a linear voltage ramp on 3VG, which produces a linear ramping of
the 3.3-V and 5-V main outputs.
During this time, if any main slot current exceeds the appropriate over-current threshold for more than the
over-current sensitivity time, the slot latches off and remains off until the logic command is turned off and on
again.
When P12VGx exceeds the 12-V gate good threshold, 5VG exceeds the 5-V good threshold, and 3VG exceeds
the 3-V gate good threshold, outputs should be fully ramped and the power MOSFETs should be fully enhanced.
+12-V Supply Control
The TPS2343 integrates an N-channel power MOSFET for the 12-V supply and a voltage multiplying charge
pump to drive the gate of the power MOSFET to 20 V. Inrush current for the 12-V supply is controlled because
the slew rate of the 12-V supply is limited. The slew rate for the 12-V supply is set by the capacitor from P12VG
to AGND.
Slew rate can be estimated as:
dV
dt
+
I
GATE
C
P12VGx
where CP12VGx is the capacitor from P12VGx to AGND and IGATE is the P12VGx gate charge current.
PCI specifications allow for 12-V supply adapter card bulk capacitance of up to 300
F. This load capacitance
causes additional inrush current of:
I
INRUSH + CLOAD
dV
dt
+ 300 mF
I
GATE
C
P12VGx
Using the recommended value for CP12VGx = 0.022 F and the typical value for IGATE = 10 A, average inrush
current can be estimated as:
I
INRUSH + 300 mF
10
mA
0.022
mF +
0.136 A
An internal currentsense circuit monitors the 12-V supply. The over-current threshold for the 12-V supply is
directly proportional to the resistor from MISET to AGND. Raising the MISET resistor simultaneously raises the
current limit threshold for the 12-V, 5-V, 3.3-V and 12-V supplies. For example, to raise the nominal output
current from the 12-V supply by 20%, increase the MISET resistor 20%. This resistor can be as high as 12 k
if necessary.
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