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Analog Devices LTC7878 | Demoboard EVAL-LTC7878-BZ
70V Parallel Five-Phase 4-Switch Buck-Boost Controller
Details
| Topologie | Abwärts- und Aufwärtswandler |
| Eingangsspannung | 40-65 V |
| Ausgang 1 | 48 V / 114 A |
Beschreibung
The evaluation circuit EVAL-LTC7878-BZ features the LTC®7878: a 70V parallelable buck-boost controller with inductor DCR current sensing. The LTC7878 is a four-switch buck-boost switching regulator designed to operate above, below, or equal to the output voltage safely and easily. The constant-frequency, peak-current mode architecture allows phase-lockable switching frequency up to 600kHz. A programmable input or output current loop regulates the average input or output current loop, making it suitable for battery charging applications. Additionally, with a wide 5V to 70V input and output range and seamless, low-noise transition between operating regions, the LTC7878 is ideal for industrial and telecom systems.The EVAL-LTC7878-BZ operates from a 36V to 65V input voltage range and generates an output of 48V and at least a 5.5kW output power. The board features five LTC7878’s in parallel to achieve very high power. The parallel operation is set to a switching frequency of 150kHz, which results in an efficient circuit. The adjacent outputs are phase shifted by 72° offset to interleave the switching while still providing great current sharing.The LTC7878 has a precision voltage reference that can generate an output voltage with a 1% tolerance over the full operating conditions. The converter achieves over 98% efficiency with a 5.5kW output power at full operating VIN.
Eigenschaften
- Single Inductor Architecture Allows VIN Above, Below or Equal to the Regulated VOUT
- Synchronous Rectification: Up to 98% Efficiency
- Wide VIN Voltage Range: 5V to 70V
- ±1% Output Voltage Accuracy: 1V ≤ VOUT ≤ 70V
- DCR or RSENSE Current Sensing
- Peak Current Mode Control in Buck/Boost/Buck-Boost Mode
- Programmable Input or Output Current Regulation
- 7V NMOS Gate Drivers
- Phase-Lockable Frequency (100kHz to 600kHz)
- Multiphase/Multi-ICs Parallel Operation
- Selectable Continuous or Pulse-Skipping Mode Operation and Inductor Peak Current Limits
- Small 32-Lead 5mm × 5mm QFN Package
- 48-Lead 7mm x 7mm x 0.75mm LFCSP Package
Typische Anwendungen
- Industrial Systems
- Battery Backup Units (BBU)
- Telecom Systems
Weiterführende Informationen
Artikeldaten
Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Drahttype | Pins | Typ | Montageart | L(mm) | H(mm) | IR(A) | Arbeitsspannung(V (AC)) | Betriebstemperatur | MusterVerfügbarkeit & Muster | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-HCF SMT-Hochstrominduktivität, 10 µH, 34.95 A | Verfügbarkeit – | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWE-HCF SMT-Hochstrominduktivität | Induktivität10 µH | Performance Nennstrom34.95 A | Sättigungsstrom 132.6 A | Sättigungsstrom @ 30%37 A | Gleichstromwiderstand2.64 mΩ | Eigenresonanzfrequenz13 MHz | DrahttypeFlach | Pins2 | – | MontageartSMT | Länge27 mm | Höhe18.5 mm | Nennstrom35 A | – | Betriebstemperatur -40 °C up to +125 °C | –Verfügbarkeit prüfen | |||
 | SPECWR-PHD Stiftleisten, –, – | Simulation– | Verfügbarkeit – | Downloads7 Dateien | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Stiftleisten | – | – | – | – | – | – | – | Pins8 | TypGerade | MontageartTHT | Länge8 mm | – | Nennstrom2 A | Arbeitsspannung200 V (AC) | Betriebstemperatur -40 °C up to +105 °C | –Verfügbarkeit prüfen |
| Erwartete Verfügbarkeit | Eingehender Bestand | Menge |
|---|---|---|
| Aktuelle Verfügbarkeit | – | – |