參數(shù)資料
型號(hào)： TPS51427ARHBT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數(shù)： 28/42頁
文件大小： 2131K
代理商： TPS51427ARHBT
Current Limit Design Considerations
( )
(
)
OCLx
DS on max
MIN OCLvalley
V
R
I
=
(9)
OCLx
TRIP
V
5 mV
R
10
I
+
=
÷
è
(10)
TRIPx
TRIP
OCLx
V
I
R
=
(11)
(
)
(
)
(
)
TRIPx(max)
TRIP
OCLx
J
V
I
R
1
TOL
1
2900ppm / C
T
25 C
=
+
°
-
°
(12)
Shutdown and Standby Control Logic
SLUS843B – MAY 2008 – REVISED SEPTEMBER 2008 .................................................................................................................................................. www.ti.com
The current limit of Channel1 can be set using the TRIP1 pin via an external small resistor to GND. Channel2
current limit can be set via the TRIP2 pin. The sourcing current for both Channel1 and Channel2 is 5
A at room
temperature with 2900 ppm/°C built-in temperature coefficient (to compensate for the temperature dependency of
the RDS(on) of the low-side MOSFET). To take advantage of this feature, a good thermal coupling between the
TPS51427A and the low-side MOSFET has to be obtained.
The current limit adjustment range (VTRIPx) is between 0.2 V and 2 V. If 5 V is applied to the pin (TRIP1 and/or
TRIP2) directly (VTRIPx > 3.1 V), TPS51427A assumes a default of a 100-mV current limit without temperature
compensation.
Once the minimum OCL level is determined, translate the minimum OCL point (DC) into minimum valley current
by subtracting of the peak-to-peak inductor current. Then convert the current information into the voltage level for
the TPS51427A to process.
where
the low-side MOSFET at T
J = 25°C
The external resistor can be set using Equation 10.
where
I
TRIP = 5 A and the tolerance is ±5%
Once ROCLx is obtained, calculate the maximum VTRIPx voltage to make sure the maximum voltage on the TRIP1
pin and/or the TRIP2 pin is less than 3.1 V for the entire operating temperature range.
The TRIPx voltage (VTRIPx ) can be calculated by Equation 11.
And maximum VTRIPx voltage can be calculated by Equation 12.
where
I
TRIP = 5 A
TOL = 5%
T
J is assumed to be 125°C for the worst case junction temperature
Shutdown and Standby Control Logic Table
ENLDO
LDO
VREF2
VREF3
EN1
EN2
Channel1
Low
Off
Low
Off
High
On
Low
Off
High
On
High
On
High
On
High
Low
On
Off
On (if VIN > 2.2 V)
High
On
Low
High
Off
On
Off (if VIN < 2 V)
On (after Channel1
High
On
High
On
is up)
On (after Channel2
High
On
High
On
is up)
34
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS51427A
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS51427ARHBTG4 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Synch Step Down Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS51427RHBR 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Synch Step Down Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS51427RHBRG4 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Sync Step Down Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS51427RHBT 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Synch Step Down Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS51427RHBTG4 功能描述:DC/DC 開關(guān)控制器 Dual D-Cap Sync Step Down Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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