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Analog Devices LTC7897 | Demoboard EVAL-LTC7897-AZ
Wide Input and Output Voltage Synchronous Buck Controller
Details
| Topologie | Abwärtswandler |
| Eingangsspannung | 16-100 V |
| Schaltfrequenz | 200-240 kHz |
| Ausgang 1 | 12 V / 20 A |
Beschreibung
The evaluation circuit EVAL-LTC7897-AZ features the LTC®7897: a 140V Low IQ Synchronous Buck Controller with Programmable 5V to 10V Gate Drive. Split gate drivers allow for easily adjustable turn-on and turn-off of FETs. User adjustable adaptive and smart dead time control modes are available for optimal gate timing. Additionally, the IC features low IQ, up to 2.5MHz programmable/synchronizable switching frequency, spread spectrum, and a small 28-lead (4mm x 5mm) QFN package. These features allow for a wide variety of applications including industrial, military, medical, and telecommunications systems.The EVAL-LTC7897-AZ operates from a 16V to 100V input voltage range and generates a 12V, 20A output (see Figure 8 in user guide). The LTC7897 has a precision voltage reference providing an output voltage with 2% tolerance over the full operating conditions. The EVAL-LTC7897-AZ is set to a 200kHz switching frequency, which results in a small and efficient circuit. The converter achieves over 93% efficiency with a 20A load at full operating VIN and peak efficiency over 96%.
Eigenschaften
Wide VIN Range: 4V to 135V (140V ABS MAX)Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 135V (140V ABS MAX)Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE, 15V ABS MAX)Adjustable Driver Voltage UVLOAdaptive or Resistor Adjustable Dead TimesSplit-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths100% Duty Cycle OperationLow Operating IQ: 5μA (48V<IN to 3.3VOUT)Spread Spectrum Frequency ModulationProgrammable Frequency (100kHz to 2.5MHz);Synchronizable Frequency (100kHz to 2.5MHz);28-Pin (4mm x 5mm) QFN Package
Typische Anwendungen
Weiterführende Informationen
Artikeldaten
Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | C | Tol. C | VR(V (DC)) | Bauform | Betriebstemperatur | DF(%) | RISO | Keramiktyp | L(mm) | B(mm) | H(mm) | Fl(mm) | Verpackung | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Drahttype | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | Raster(mm) | Ø D(mm) | Pins | Typ | Montageart | IR(A) | Arbeitsspannung(V (AC)) | Muster | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 50 V(DC), 6.8 nF, ±10% | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWCAP-CSGP MLCCs 50 V(DC) | Kapazität6.8 nF | Kapazität±10% | Nennspannung50 V (DC) | Bauform0603 | Betriebstemperatur -55 °C up to +125 °C | Verlustfaktor2.5 % | Isolationswiderstand10 GΩ | KeramiktypX7R Klasse II | Länge1.6 mm | Breite0.8 mm | Höhe0.8 mm | Pad Dimension0.4 mm | Verpackung7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
 | WCAP-AT1H Aluminium-Elektrolytkondensatoren, 47 µF, ±20% | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWCAP-AT1H Aluminium-Elektrolytkondensatoren | Kapazität47 µF | Kapazität±20% | Nennspannung200 V (DC) | Bauform13.0 x 20.0 | – | Verlustfaktor15 % | – | – | Länge20 mm | – | – | – | VerpackungAmmopack | – | – | – | – | – | – | – | Endurance 10000 | Rippelstrom980 mA | Leckstrom476 µA | Raster5 mm | Durchmesser13 mm | – | – | – | – | – | ||||
 | WE-HCF SMT-Hochstrominduktivität, –, – | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWE-HCF SMT-Hochstrominduktivität | – | – | – | Bauform2013 | Betriebstemperatur -40 °C up to +125 °C | – | – | – | Länge20.8 mm | Breite20.5 mm | Höhe13.5 mm | – | – | Induktivität5.5 µH | Performance Nennstrom23.35 A | Sättigungsstrom 130 A | Sättigungsstrom @ 30%33 A | Gleichstromwiderstand4.4 mΩ | Eigenresonanzfrequenz21 MHz | DrahttypeFlach | – | – | – | – | – | Pins2 | – | MontageartSMT | Nennstrom22 A | – | ||||
 | WR-PHD Stiftleisten, –, – | Simulation– | Downloads7 Dateien | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Stiftleisten | – | – | – | – | Betriebstemperatur -40 °C up to +105 °C | – | Isolationswiderstand1000 MΩ | – | Länge6 mm | – | – | – | VerpackungBeutel | – | – | – | – | – | – | – | – | – | – | Raster2 mm | – | Pins6 | TypGerade | MontageartTHT | Nennstrom2 A | Arbeitsspannung200 V (AC) |