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)： 17/44頁(yè)
文件大?。?/td> 983K
代理商： TPS2459RHBR
PRODUCTPREVIEW
3.3-V Current Limiting
3.3-V Fast Trip Function
3.3-V Current Limit Function
LIMIT
SUM3
650 V
I
R
=
(1)
3.3-V Over-Temperature Shutdown
3.3-V ORing
SLUS917 – FEBRUARY 2009 ............................................................................................................................................................................................ www.ti.com
The 3.3-V management power channel includes an internal pass FET and current sense resistor. The
on-resistance of the management channel (including pass FET, sense resistor, metallization resistance, and
bond wires) typically equals 290 m
and never exceeds 500 m. The AdvancedMC specification allows a total
of 1
between the power source and the load. The TPS2459 never consumes more than half of this
requirement.
The 3.3-V fast trip function protects the channel against short-circuit events. If the current through the channel
exceeds a nominal value of 300 mA, then the TPS2459 immediately disables the internal pass transistor and
then allows it to slowly turn back on into current limiting.
The 3.3-V current limit function internally limits the current to comply with the AdvancedMC and MicroTCA
specifications. External resistor RSUM3 allows the user to adjust the current limit threshold. The nominal current
limit threshold ILIMIT is shown in Equation 1.
A 3320-
resistor gives a nominal current limit of ILIMIT = 195 mA which complies with AdvancedMC and
MicroTCA specifications. This resistance corresponds to an EIA 1% value. Alternatively, a 3.3-k
resistor also
suffices. Whenever the 3.3-V channel enters current limit, its fault timer begins to operate (see Fault Timer
Programming section).
The 3.3-V over-temperature shutdown is enabled if the 3.3 V channel remains in current limit while the die
temperature exceeds approximately 140°C. When this occurs, the channel operating in current limit turns off until
the chip cools by approximately 10°C.
The 3.3-V channel limits reverse current flow by sensing the input-to-output voltage differential and turning off the
internal pass FET when this differential drops below –3 mV. This corresponds to a nominal reverse current flow
of 10 mA. The pass FET turns back on when the differential exceeds +10 mV. These thresholds provide a
nominal 13 mV of hysteresis to help prevent false triggering. This feature allows the implementation of redundant
power supplies (also known as supply ORing).
If the 3.3-V channel does not use redundant supplies, the 3ORON bit can be cleared to disable the ORing
circuitry. This precaution eliminates the chance that transients might trigger the ORing circuitry and upset system
operation.
24
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS2459
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