Linear公司的LTC3787是高性能多相單輸出同步升壓電源轉換器控制器,能驅動兩個N溝功率MOSFET.輸入電壓4.5V-38V,輸出電壓高達60V,±1% 1.200V基準電壓, 可編程固定頻率50kHz到900kHz,靜態電流135uA,主要用于工業,汽車,醫療設備和軍用.本文介紹了LTC3787主要特性,方框圖, 12相工作連接圖以及高效2相24V,46V和48V升壓轉換器電路圖, 4相單輸出升壓轉換器電路圖,演示板DC1411A主要性能特性,電路圖,材料清單和PCB元件布局圖.
The LTC3787 is a high performance PolyPhase single output synchronous boost converter controller that drives two N-channel power MOSFET stages out-of-phase. Multiphase operation reduces input and output capacitor requirements and allows the use of smaller inductors than the single-phase equivalent. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, enabling high power boost applications.
A 4.5V to 38V input supply range encompasses a wide range of system architectures and battery chemistries. When biased from the output of the boost converter or another auxiliary supply, the LTC3787 can operate from an input supply as low as 2.5V after start-up. The operating frequency can be set for a 50kHz to 900kHz range or synchronized to an external clock using the internal PLL.
PolyPhase operation allows the LTC3787 to be configured for 2-, 3-, 4-, 6- and 12-phase operation.
The SS pin ramps the output voltage during start-up. The PLLIN/MODE pin selects Burst Mode. operation, pulseskipping mode or forced continuous mode at light loads.
LTC3787主要特性:
2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise
Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation
Wide VIN Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up
Output Voltage Up to 60V
±1% 1.200V Reference Voltage
RSENSE or Inductor DCR Current Sensing
100% Duty Cycle Capability for Synchronous MOSFET
Low Quiescent Current: 135μA
Phase-Lockable Frequency (75kHz to 850kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Power Good Output Voltage Monitor
Low Shutdown Current, IQ < 8μA
Internal LDO Powers Gate Drive from VBIAS or EXTVCC
Thermally Enhanced Low Profile 28-Pin 4mmx 5mm
QFN Package and Narrow SSOP Package
LTC3787應用:
Industrial
Automotive
Medical
Military
圖1.LTC3787方框圖
圖2.LTC3787 12相工作連接圖
圖3.LTC3787高效2相24V升壓轉換器電路圖
圖4.LTC3787高效2相48V升壓轉換器電路圖
圖5.LTC3787高效2相36V升壓轉換器電路圖
圖6.LTC3787高效2相48V升壓轉換器電路圖
圖7.LTC3787采用電感DCR電流檢測的高效2相24V升壓轉換器電路圖
圖8.LTC3787 4相單輸出升壓轉換器電路圖
演示板DC1411A主要性能特性:
圖9.演示板DC1411A電路圖:輸入5-24V,輸出24V/6A
演示板DC1411A材料清單:
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Qty
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Reference
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Part Description
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Manufacturer / Part #
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REQUIRED CIRCUIT COMPONENTS:
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3
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CIN1,COUT5,COUT10
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CAP., 150uF,35V,EP-cap
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SUNCON, 35HVH150M
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12
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COUT1, COUT2, COUT3, COUT4, COUT6, COUT7, COUT8, COUT9, CIN2, CIN3, CIN4, CIN5
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Cap.,X5R, 22uF 25V, 20%,1812
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TDK, C4532X5R1E226M
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1
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C2,
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Cap., NPO, 100pF, 25V,10%,0603
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AVX, 06033A101KAT
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1
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C3
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Cap.,X7R, 15nF, 25V, 10%,0603
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AVX, 06033C153KAT
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4
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C4,C9,C15,C16
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Cap., X5R, 0.1uF, 25V, 10%, 0603
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AVX, 06033D104KAT2A
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3
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C5,C10,C18
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Cap., NPO, 1000pF, 25V,10%,0603
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AVX, 06033A102KAT
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1
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C8
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Cap., X5R, 4.7uF, 25V, 10%,0805
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TaiyoYuden, TMK212BJ475KG-T
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2
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D1,D2
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DIODE, 30V, SOD323
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Infineon, BAS140W
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2
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L1,L2
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Inductor, 3.3uH
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PULSE-PA1494.362NL
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2
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Q2,Q8
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MOSFET,N Chanel,LFPAK
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RENESAS, RJK0452DPB
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2
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Q4,Q6
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MOSFET,N Chanel,LFPAK
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RENESAS, RJK0453DPB
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4
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RSNS1,RSNS2,RSNS3,RSNS4
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Res., Chip, 0.008, 1%, 2010
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VISHAY, WSL20108L000FEA
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6
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R2,R3,R5,R7,R15,R18
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Res., Chip, 0 Ohm, 1%, 0603
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VISHAY, CRCW06030000Z0EA
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1
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R6
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Res., Chip, 232K, 1%, 0603
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VISHAY, CRCW0603232KFKED
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3
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R8,R9,R34
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Res., Chip, 12.1K, 1%, 0603
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VISHAY, CRCW060312K1FKEA
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4
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R11,R16,R35,R36
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Res., Chip, 10K, 1%, 0603
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VISHAY, CRCW060310KFKEA
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4
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R13,R17,R19,R21
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Res., Chip, 10, 1%, 0603
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VISHAY, CRCW060310R0FKEA
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2
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R26,C17
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Res., Chip, 100K, 1%, 0603
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VISHAY, CRCW0603100KFKEA
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1
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R32
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Res., Chip, 2.21, 1%, 0603
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VISHAY, CRCW06032R21FNEA
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1
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R33
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Res., Chip, 38.3K ,1%, 0603
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VISHAY, CRCW060338K3FKEA
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1
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U1
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I.C. LTC3787EUFD QFN28 - 4X5
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Linear Tech.,LTC3787EUFD
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ADDITIONAL DEMO BOARD CIRCUIT COMPONENTS:
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0
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C1,C19,C20
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OPT, 0603
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0
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Q1,Q3,Q5,Q7
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OPT, LFPAK
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0
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R1,R4,R10,R31
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OPT, 0603
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HARDWARE-FOR DEMO BOARD ONLY:
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11
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E1,E5,E6,E7,E8,E11, E12,E13,E14,E15,E21
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Turret, Testpoint , 091"
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Mill Max 2501-2-00-80-00-00-07-0
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2
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E2,E4
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JACK BANANA
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KEYSTONE, 575-4
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2
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E9,E10
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STUD, TEST PIN
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PEM KFH-032-10
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4
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(E9,E10)X2
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NUT, BRASS NUTS # 10-32
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ANY #10-32
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2
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E9,E10
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RING, LUG RING # 10
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KEYSTONE #10
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2
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E9,E10
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WASHER, TIN PLATED BRASS
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ANY #10
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2
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JP1,JP5
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Headers, 4 Pins 2mm Ctrs.
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Samtec TMM-104-02-L-S
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1
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JP2
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Headers, 3 Pins 2mm Ctrs.
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Samtec TMM-103-02-L-S
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4
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XJP1-XJP2
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Shunt, 2mm Ctrs.
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Samtec 2SN-BK-G
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4
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STAND-OFF, NYLON 0.5" tall
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KEYSTONE, 8833(SNAP ON)
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圖10.演示板DC1411A PCB元件布局圖:頂層
圖11.演示板DC1411A PCB元件布局圖:底層
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