參數(shù)資料
型號： TPS2458RHBR
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
文件頁數(shù)： 9/28頁
文件大小： 966K
代理商： TPS2458RHBR
12-V Fast Trip and Current Limiting
12-V Fast Trip Function
FT
S
100 mV
I
R
=
(2)
12-V Current Limit Function
SENSE
SUM
12SUM
SENSE
SET
R
V
I
R
=
÷
è
(3)
SET
LIMIT
SUM
SENSE
R
I
0.675 V
R
=
÷
è
(4)
LIMIT
SET
0.0198 A
I
R
=
÷
W
è
(5)
www.ti.com ............................................................................................................................................................................................ SLUS916 – FEBRUARY 2009
Figure 19 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.
The 12-V fast trip function is designed to protect the channel against short-circuit events. If the voltage across
RSENSE exceeds a nominal threshold of 100 mV, the device will immediately disable the pass transistor and
declare a fault condition. The nominal fast trip threshold is shown in Equation 2.
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 19. 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), the amplifier sources current to PASS. When the voltage on the 12SUM pin
exceeds the reference voltage, amplifier A2 begins to sink current from the PASS pin. 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.
The recommended value of RSUM is 6810 . This resistor should never equal less than 675 to prevent
excessive currents from flowing through the internal circuitry. Using the recommended values of RSENSE = 5 m
and RSUM = 6810 gives Equation 5.
Copyright 2009, Texas Instruments Incorporated
17
Product Folder Link(s): TPS2458
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