參數(shù)資料
型號(hào)： TPS2363PFBG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48
封裝： PLASTIC, TQFP-48
文件頁(yè)數(shù)： 13/44頁(yè)
文件大小： 840K
代理商： TPS2363PFBG4
5.63
3
+ 1.88 A
dv
dt +
I
GATE
C
MILLER
(gfs ) 1)
I
LOAD
C
LOAD
+
I
GATE
C
MILLER
4
C
MILLER
4 +
I
GATE
C
LOAD
I
LOAD
C
MILLER +
(25 mA
2000 mF)
1.88
4
+ 6.6 nF, (use 6800 pF)
SLUS680B – JANUARY 2006 – REVISED JANUARY 2010
www.ti.com
For the 12-V output, a P-channel FET is used in order to get sufficient VGS for control. In this configuration the
FET is a high-gain amplifier. The slew rate for the 12 V is controlled by a Miller capacitance from the gate of the
FET to the source. The calculation is the same as the 3.3 V case but CMILLER is reduced because by the gfs of
the FET.
Example:
The PCIExpress specification allows for 2000 mF maximum capacitance for the 12 V.
Minimum trip point for the 12 V with an 8 m
is 5.63 A. Use
.
Assume a gfs for the FET of about 3.
IGATE = 25 mA .
The equation to calculate the slew rate of the 12 V is:
The delay time from ONA/B is controlled by the sum CGATE and CMILLER. Add a gate capacitor to the 12-V FET
gate to keep the power on delay about the same as the 3.3-V FET. Since CMILLER is small compared to the 3.3-V
CGATE, use the same capacitor value for 12-V gate as for the 3.3 V.
The table below shows the recommended gate capacitor for the 3.3-V and 12-V supply for the different connector
widths.
Table 6. Recommended Gate Capacitor(1)
VOLTAGE
WIDTH
CMILLER (pF)
CGATE (nF)
+3.3
All
22
+12
All
6800
22
(1)
Recommended capacitors to limit inrush current.
20
Copyright 2006–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2363
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TPS2363PFBR 功能描述:熱插拔功率分布 PCIExpress Srvr Dual Slot Hot Plug Cntrlr RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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TPS2370DG4 功能描述:熱插拔功率分布 IEEE 802.3af Pwr Ifc Switch For PoE PD’s RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2370DR 功能描述:熱插拔功率分布 IEEE 802.3af Pwr Ifc Switch For PoE PD’s RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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