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Analog Devices LT8708 | Demoboard DC2719A
LT8708/LT8708-1 80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller with Flexible Bidirectional Capability
Details
| Topologie | Abwärts- und Aufwärtswandler |
| Eingangsspannung | 10.5-25 V |
| Schaltfrequenz | 100-400 kHz |
| Ausgang 1 | 14.5 V / 40 A |
Beschreibung
Demonstration circuit 2719A is a high performance bidirectional buck-boost converter featuring the LT8708/ LT8708-1 that can operate from input voltages above, below or equal to the output voltage. The demo board input range is 10.5V to 14.5V (25VMAX). The output voltage is set at 14.5V and the output current limit at 40A. The board can operate in both forward and reverse mode.The controller has integrated input voltage and output voltage regulators and two sets of input and output current regulators that control current flow in forward or reverse direction. Features are included that simplify bidirectional power conversion in battery/capacitor backup systems and other applications that may need regulation of VIN, VOUT, IIN and/or IOUT.While the current mode control limits the inductor current both in normal and in reverse direction these current limits have some variation as input/output voltage changes. The forward and reverse input and output current regulators offer four accurate current limits that can be set individually.The input voltage regulator is often used in applications with high impedance power sources and will reduce the forward current if the input voltage drops below the set point. When operating with reverse current flow, the input voltage regulator regulates the voltage at the input side.The operating mode of the controller is determined through the MODE pin (jumper JP9 Pins 5 to 12) and can be set to discontinuous mode, hybrid discontinuous mode, forced continuous mode and Burst Mode® operation.The LT8708 is capable of bidirectional operation when operating in the continuous conduction mode (CCM). DCM, HCM and Burst Mode operation only allow power to flow in one direction. Additional circuitry may be needed depending on the application.
Eigenschaften
- Single Inductor Allows VIN Above, Below, or Equal to VOUT
- Six Independent Forms of Regulation
- VIN Current (Forward and Reverse)
- VOUT Current (Forward and Reverse)
- VIN and VOUT Voltage
- Forward and Reverse Discontinuous Conduction Mode Supported
- Supports MODE and DIR Pin Changes While Switching
- VINCHIP Range 2.8V (Need EXTVCC > 6.4V) to 80V
- VOUT Range: 1.3V to 80V
- Synchronous Rectification: Up to 99% Efficiency
- Available in 40-Lead (5mm × 8mm) QFN with High Voltage Pin Spacing
Typische Anwendungen
- High Voltage Buck-Boost Converters / Bidirectional Charging System
- Automotive 48V Systems
Weiterführende Informationen
Artikeldaten
Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | L(mm) | f(mm) | C | Tol. C | VR(V (DC)) | Bauform | Betriebstemperatur | Q(%) | RISO | Keramiktyp | B(mm) | H(mm) | Fl(mm) | Verpackung | Pins | Typ | Montageart | IR(A) | Arbeitsspannung(V (AC)) | Farbe | Gender | Muster | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 25 V(DC), 1.6 mm, – | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWCAP-CSGP MLCCs 25 V(DC) | Länge1.6 mm | – | Kapazität100 pF | Kapazität±5% | Nennspannung25 V (DC) | Bauform0603 | Betriebstemperatur -55 °C up to +125 °C | Güte1000 % | Isolationswiderstand10 GΩ | KeramiktypNP0 Klasse I | Breite0.8 mm | Höhe0.8 mm | Pad Dimension0.4 mm | Verpackung7" Tape & Reel | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 25 V(DC), 1.6 mm, – | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWCAP-CSGP MLCCs 25 V(DC) | Länge1.6 mm | – | Kapazität470 pF | Kapazität±5% | Nennspannung25 V (DC) | Bauform0603 | Betriebstemperatur -55 °C up to +125 °C | Güte1000 % | Isolationswiderstand10 GΩ | KeramiktypNP0 Klasse I | Breite0.8 mm | Höhe0.8 mm | Pad Dimension0.4 mm | Verpackung7" Tape & Reel | – | – | – | – | – | – | – | |||||
 | WR-PHD Kurzschlussbrücken, 2.44 mm, – | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Kurzschlussbrücken | Länge2.44 mm | – | – | – | – | – | Betriebstemperatur -40 °C up to +125 °C | – | Isolationswiderstand1000 MΩ | – | – | – | – | VerpackungBeutel | Pins1 | – | – | Nennstrom3 A | Arbeitsspannung250 V (AC) | FarbeSchwarz | GenderJumper | |||
 | WA-SNSR Self-Retaining Spacer, 9.5 mm, 4.8 mm | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWA-SNSR Self-Retaining Spacer | Länge9.5 mm | Bohrung in Blende4.8 mm | – | – | – | – | Betriebstemperatur -30 °C up to +85 °C | – | – | – | – | – | – | – | – | – | – | – | – | FarbeNatur | – | |||
 | WR-PHD Stiftleisten - Zweireihig, 10.16 mm, – | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Stiftleisten - Zweireihig | Länge10.16 mm | – | – | – | – | – | Betriebstemperatur -40 °C up to +105 °C | – | Isolationswiderstand1000 MΩ | – | – | – | – | VerpackungBeutel | Pins8 | TypGerade | MontageartTHT | Nennstrom3 A | Arbeitsspannung250 V (AC) | – | GenderStiftleiste | |||
 | WR-PHD Stiftleisten - Zweireihig, 20.32 mm, – | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Stiftleisten - Zweireihig | Länge20.32 mm | – | – | – | – | – | Betriebstemperatur -40 °C up to +105 °C | – | Isolationswiderstand1000 MΩ | – | – | – | – | VerpackungBeutel | Pins16 | TypGerade | MontageartTHT | Nennstrom3 A | Arbeitsspannung250 V (AC) | – | GenderStiftleiste | |||
 | WR-PHD Stiftleisten - Zweireihig, 33.02 mm, – | Simulation– | Downloads7 Dateien | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Stiftleisten - Zweireihig | Länge33.02 mm | – | – | – | – | – | Betriebstemperatur -40 °C up to +105 °C | – | Isolationswiderstand1000 MΩ | – | – | – | – | VerpackungBeutel | Pins26 | TypGerade | MontageartTHT | Nennstrom3 A | Arbeitsspannung250 V (AC) | – | GenderStiftleiste |