參數(shù)資料
型號(hào)： TPS2459RHBR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 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)： 18/44頁(yè)
文件大?。?/td> 983K
代理商： TPS2459RHBR
PRODUCTPREVIEW
12-V Fast Trip and Current Limiting
UDG-09040
13
SET
12
SENM
11
PASS
8
OUT12
R
SET
12 V
V
IN
TPS2459
+
14
SENP
R
SENSE
5
SUM12
R
SUM
+
100 mV
Fast Trip Comparator
30 mA
A1
+
A2
675 mV
12-V Fast Trip Function
FT
SENSE
100mV
I
R
=
(2)
12-V Current Limit Function
SENSE
SUM
12SUM
SENSE
SET
R
V
I
R
=
÷
è
(3)
www.ti.com ............................................................................................................................................................................................ SLUS917 – FEBRUARY 2009
Figure 21 shows a simplified block diagram of the circuitry associated with the fast trip and current limit circuitry
in the 12-V channel, which requires an external N-channel pass FET and three external resistors. These resistors
allow the user to independently set the fast trip threshold and the current limit threshold, as described below.
Figure 21. 12-V Channel Threshold Circuitry
The 12-V fast trip function protects the channel against short-circuit events. If the voltage across external resistor
RSENSE exceeds the fast trip threshold, then the TPS2459 immediately disables the pass transistor. The 12CL
bits set the magnitude of the fast trip threshold. When 12CL = 1111B, the fast trip threshold nominally equals 100
mV. The fast trip current IFT corresponding to this threshold is shown in Equation 2.
The recommended value of (RSENSE = 5 m) sets the fast trip threshold at 20 A for 12CL = 1111B. This choice of
sense resistor corresponds to the maximum 19.4 A inrush current allowed by the MicroTCA specification.
The 12-V current limit function regulates the PASS pin voltage to prevent the current through the channel from
exceeding ILIMIT. The current limit circuitry includes two amplifiers, A1 and A2, as shown in Figure 21. Amplifier A1
forces the voltage across external resistor RSET to equal the voltage across external resistor RSENSE. The current
that flows through RSET also flows through external resistor RSUM, generating a voltage on the 12SUM pin is
shown in Equation 3.
Amplifier A2 senses the voltage on the 12SUM pin. As long as this voltage is less than the reference voltage on
its positive input (nominally 0.675 V for 12CL = 1111B), the amplifier sources current to PASS. When the voltage
on the 12SUM pin exceeds the reference voltage, amplifier A2 begins to sink current from PASS. The
gate-to-source voltage of pass FET MPASS drops until the voltages on the two inputs of amplifier A2 balance.
The current flowing through the channel then nominally is shown in Equation 4.
Copyright 2009, Texas Instruments Incorporated
25
Product Folder Link(s): TPS2459
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