參數(shù)資料
型號(hào)： TPS2459RHBR
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32
封裝： PLASTIC, QFP-32
文件頁(yè)數(shù)： 26/44頁(yè)
文件大?。?/td> 983K
代理商： TPS2459RHBR
PRODUCTPREVIEW
Multiswap Operation in Redundant Systems
Backplane
TPS2459
Power Source 1
mC
TPS2459
SUM3
SUM12
Power Source 2
R
SUM3
mC
UDG-09036
R
SUM12
7
21
SUM12
R
SUM3
R
SUM12
7
21
SUM3
UDG-09036
Power Source 1
TPS2459
SUM3
SUM12
Power Source 2
Backplane
TPS2459
SUM3
SUM12
5
21
R
SUM12
R
SUM3
5
21
SLUS917 – FEBRUARY 2009 ............................................................................................................................................................................................ www.ti.com
TheTPS2459 features an additional mode of operation called Multiswap redundancy. This technique does not
require a microcontroller, making it simpler and faster than the redundancy schemes described in the
MicroTCAstandard. Multiswap is especially attractive for AdvancedMC applications that require redundancy
but need not comply with the MicroTCA power module standard.
To implement Multiswap redundancy, connect the SUM pins of the redundant channels together and tie a single
RSUM resistor from this node to ground. The current limit thresholds now apply to the sum of the currents
delivered by the redundant supplies. When implementing Multiswap redundancy on 12-V channels, all of the
channels must use the same values of resistors for RSENSE and RSET.
Figure 26 and Figure 27 compare the redundancy technique advocated by the MicroTCA specification with
Multiswap redundancy. MicroTCA redundancy independently limits the current delivered by each power
source. The current drawn by the load cannot exceed the sum of the current limits of the individual power
sources. Multiswap redundancy limits the current drawn by the load to a fixed value regardless of the number of
operational power sources. Removing or inserting power sources within a Multiswap system does not affect the
current limit seen by the load.
Figure 26.
TCA Redundancy
Figure 27. Multiswap Redundancy
32
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS2459
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