參數(shù)資料
型號(hào)： LTC3786EMSE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, PLASTIC, MSOP-16
文件頁(yè)數(shù)： 6/34頁(yè)
文件大?。?/td> 397K
代理商： LTC3786EMSE#TRPBF
LTC3786
14
3786fa
applicaTions inForMaTion
TheTypicalApplicationonthefirstpageisabasicLTC3786
applicationcircuit.LTC3786canbeconfiguredtouseeither
inductor DCR (DC resistance) sensing or a discrete sense
resistor (RSENSE) for current sensing. The choice between
the two current sensing schemes is largely a design trade-
off between cost, power consumption and accuracy. DCR
sensing is becoming popular because it does not require
current sensing resistors and is more power efficient,
especially in high current applications. However, current
sensing resistors provide the most accurate current limits
for the controller. Other external component selection is
driven by the load requirement, and begins with the se-
lection of RSENSE (if RSENSE is used) and inductor value.
Next, the power MOSFETs are selected. Finally, input and
output capacitors are selected.
SENSE+ and SENSE– Pins
The SENSE+ and SENSE– pins are the inputs to the cur-
rent comparators. The common mode input voltage range
of the current comparators is 2.5V to 38V. The current
sense resistor is normally placed at the input of the boost
controller in series with the inductor.
The SENSE+ pin also provides power to the current com-
parator. It draws ~200A during normal operation. There
is a small base current of less than 1A that flows into
the SENSE– pin. The high impedance SENSE– input to the
current comparators allows accurate DCR sensing.
Filter components mutual to the sense lines should be
placed close to the LTC3786, and the sense lines should
run close together to a Kelvin connection underneath the
current sense element (shown in Figure 1). Sensing cur-
rent elsewhere can effectively add parasitic inductance
and capacitance to the current sense element, degrading
the information at the sense terminals and making the
programmed current limit unpredictable. If DCR sensing
is used (Figure 2b), sense resistor R1 should be placed
closetotheswitchingnode,topreventnoisefromcoupling
into sensitive small-signal nodes.
Sense Resistor Current Sensing
A typical sensing circuit using a discrete resistor is shown
in Figure 2a. RSENSE is chosen based on the required
output current.
The current comparator has a maximum threshold
VSENSE(MAX) of 75mV. The current comparator threshold
sets the peak of the inductor current, yielding a maximum
average inductor current, IMAX, equal to the peak value
VIN
TO SENSE FILTER,
NEXT TO THE CONTROLLER
INDUCTOR OR RSENSE
3786 F01
(OPTIONAL)
VIN
VOUT
3786 F02a
TG
SW
BG
LTC3786
INTVCC
BOOST
SENSE+
SENSE–
VBIAS
SGND
TG
SW
BG
INDUCTOR
DCR
L
LTC3786
INTVCC
BOOST
SENSE+
SENSE–
R2
C1
VBIAS
VIN
VOUT
PLACE C1 NEAR SENSE PINS
SGND
3786 F02b
(R1||R2) C1 =
L
DCR
RSENSE(EQ) = DCR
R2
R1 + R2
R1
(2b) Using the Inductor DCR to Sense Current
(2a) Using a Resistor to Sense Current
Figure 2. Two Different Methods of Sensing Current
Figure 1. Sense Lines Placement with Inductor or Sense Resistor
相關(guān)PDF資料
PDF描述
LTC3786EMSE#PBF SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO16
LTC3786EUD#PBF SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PQCC16
LTC3787IGN#TRPBF SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PDSO28
LTC3787EGN#TRPBF SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PDSO28
LTC3787EUFD#PBF SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PQCC28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC3786EUD#PBF 制造商:Linear Technology 功能描述:IC, DC-DC CONV, 550kHz, QFN16
LTC3786EUD#TRPBF 功能描述:IC REG CTRLR BST PWM CM 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LTC3786IMSE#PBF 功能描述:IC REG CTRLR BST PWM CM 16-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LTC3786IMSE#TRPBF 功能描述:IC REG CTRLR BST PWM CM 16-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
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