Datasheet LTC7804 (Analog Devices) - 29
| Fabricante | Analog Devices |
| Descripción | Low IQ Synchronous Boost Controller |
| Páginas / Página | 34 / 29 — TYPICAL APPLICATIONS. Figure 9. High Efficiency 375kHz 24V Boost Converter |
| Formato / tamaño de archivo | PDF / 1.5 Mb |
| Idioma del documento | Inglés |
TYPICAL APPLICATIONS. Figure 9. High Efficiency 375kHz 24V Boost Converter
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Versión de texto del documento
LTC7804
TYPICAL APPLICATIONS
RUN LTC7804 VBIAS SENSE+ V EXTV R CC 1nF SENSE C IN IN 4.5V TO 38V 2mΩ 10µF 200Ω MODE SENSE– L PLLIN/SPREAD 2µH FREQ TG CSS 0.1µF SW V SS C OUT B MTOP COUTA + 24V C 0.1µF C ITH 10µF OUTB 6A* 22nF RITH ×2 100µF 8.06k BOOST ITH CITHA 220pF D BG MBOT RA INTVCC 31.6k CINT VFB 4.7µF GND RS 604k 7804 F09 CIN, COUTA: MURATA GCM32EC71H106KA03 COUTB: SUNCON 63HVPF100M D: INFINEON BAS140W L: COILCRAFT SER2011-202MLD MBOT, MTOP: INFINEON BSC059N04LS6 *WHEN VIN > 24V, VOUT FOLLOWS VIN; WHEN VIN < 9V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED.
Figure 9. High Efficiency 375kHz 24V Boost Converter
EXTVCC RUN MODE VBIAS PLLIN/SPREAD SENSE+ VIN RSENSE CIN 9V TO 38V C FREQ SS 7mΩ 10µF 0.1µF SENSE– ×2 BOOST L SS C TG 33µH ITH 10nF D RITH V LTC7804 SW OUT* 45.3k 80V ITH + 1.5A C COUTA C ITHA BG MBOT OUTB 100pF 10µF 68µF ×3 INTVCC RA CINT 12.1k 4.7µF VFB GND RS 806k 7804 F10 CIN: MURATA GCM32EC71H106KA03 COUTA: TDK C5750X7S2A106K230KE COUTB: SUNCON100CE68LX D: VISHAY VS-12CWQ10FN-M3 L: COILCRAFT XAL1510-333MEB MBOT: INFINEON BSC159N10LSF-G *WHEN VIN < 24V, MAXIMUM LOAD CURRENT AVAILABLE IS DERATED BY INPUT CURRENT LIMIT.
Figure 10. Low IQ Nonsynchronous 80V/120W Boost Converter
Rev. 0 For more information www.analog.com 29 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Main Control Loop INTVCC/EXTVCC Power Boost Supply and Dropout (BOOST and SW Pins) Shutdown and Start-Up (RUN, SS Pins) Light Load Current Operation: Burst Mode Operation, Pulse-Skipping or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum and Phase-Locked-Loop (FREQ and PLLIN/SPREAD Pins) Operation When VIN > VOUT Operation at Low Input Voltage BOOST Supply Refresh and Internal Charge Pump Applications Information SENSE+ and SENSE– Pins Low Value Resistor Current Sensing Inductor DCR Sensing Inductor Value Calculation Inductor Core Selection Power MOSFET Selection CIN and COUT Selection Setting Output Voltage RUN Pin Soft-Start (SS Pin) INTVCC Regulators Topside MOSFET Driver Supply (CB, DB) Phase-Locked Loop and Frequency Synchronization Setting the Operating Frequency Selecting the Light-Load Operating Mode Minimum On-Time Considerations Fault Conditions: Overtemperature Protection Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Package Description Typical Application Related Parts
TYPICAL APPLICATIONS
RUN LTC7804 VBIAS SENSE+ V EXTV R CC 1nF SENSE C IN IN 4.5V TO 38V 2mΩ 10µF 200Ω MODE SENSE– L PLLIN/SPREAD 2µH FREQ TG CSS 0.1µF SW V SS C OUT B MTOP COUTA + 24V C 0.1µF C ITH 10µF OUTB 6A* 22nF RITH ×2 100µF 8.06k BOOST ITH CITHA 220pF D BG MBOT RA INTVCC 31.6k CINT VFB 4.7µF GND RS 604k 7804 F09 CIN, COUTA: MURATA GCM32EC71H106KA03 COUTB: SUNCON 63HVPF100M D: INFINEON BAS140W L: COILCRAFT SER2011-202MLD MBOT, MTOP: INFINEON BSC059N04LS6 *WHEN VIN > 24V, VOUT FOLLOWS VIN; WHEN VIN < 9V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED.
Figure 9. High Efficiency 375kHz 24V Boost Converter
EXTVCC RUN MODE VBIAS PLLIN/SPREAD SENSE+ VIN RSENSE CIN 9V TO 38V C FREQ SS 7mΩ 10µF 0.1µF SENSE– ×2 BOOST L SS C TG 33µH ITH 10nF D RITH V LTC7804 SW OUT* 45.3k 80V ITH + 1.5A C COUTA C ITHA BG MBOT OUTB 100pF 10µF 68µF ×3 INTVCC RA CINT 12.1k 4.7µF VFB GND RS 806k 7804 F10 CIN: MURATA GCM32EC71H106KA03 COUTA: TDK C5750X7S2A106K230KE COUTB: SUNCON100CE68LX D: VISHAY VS-12CWQ10FN-M3 L: COILCRAFT XAL1510-333MEB MBOT: INFINEON BSC159N10LSF-G *WHEN VIN < 24V, MAXIMUM LOAD CURRENT AVAILABLE IS DERATED BY INPUT CURRENT LIMIT.
Figure 10. Low IQ Nonsynchronous 80V/120W Boost Converter
Rev. 0 For more information www.analog.com 29 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Main Control Loop INTVCC/EXTVCC Power Boost Supply and Dropout (BOOST and SW Pins) Shutdown and Start-Up (RUN, SS Pins) Light Load Current Operation: Burst Mode Operation, Pulse-Skipping or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum and Phase-Locked-Loop (FREQ and PLLIN/SPREAD Pins) Operation When VIN > VOUT Operation at Low Input Voltage BOOST Supply Refresh and Internal Charge Pump Applications Information SENSE+ and SENSE– Pins Low Value Resistor Current Sensing Inductor DCR Sensing Inductor Value Calculation Inductor Core Selection Power MOSFET Selection CIN and COUT Selection Setting Output Voltage RUN Pin Soft-Start (SS Pin) INTVCC Regulators Topside MOSFET Driver Supply (CB, DB) Phase-Locked Loop and Frequency Synchronization Setting the Operating Frequency Selecting the Light-Load Operating Mode Minimum On-Time Considerations Fault Conditions: Overtemperature Protection Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Package Description Typical Application Related Parts