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STMicroelectronics PM8804TR | Demoboard DN0046
Power over ethernet - PD converter with 24 V 2.5 A output, synchronous flyback
Details
| Topologie | Sperrwandler |
| Eingangsspannung | 36-46 V |
| Ausgang 1 | 29 V / 25 A |
| IC-Revision | 1 |
Beschreibung
This Design Notes describes a Flyback circuit for PoE applications, delivering 24 V @2.5 A.A prototype with these characteristics has been based on modifying an existing demo board, the STEVAL-POE002V1; this demo board integrates a front-end part to interface the Ethernet input and a 40 W converter delivering 5 V @8 A). Only the DC-DC converter part has been used to do the trials (to the right of the red line in the below figure) after modifying the circuitry according to the new design specification
Eigenschaften
- Input voltage range 36 V to 54 V
- Output voltage 24 V ±5%
- Switching frequency 250 KHz
- Max. Output current 2.5 A
- PWM operation current mode controller
- Max. Output power 60 W
- DC-DC Efficiency above 90%
- Peak to peak output ripple at full load 160 mV
- Transient response ΔV pk-pk 100% to 50% load step 1.4 V
Artikeldaten
Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | C | Tol. C | VR(V (DC)) | Betriebstemperatur | DF(%) | RISO | L(mm) | B(mm) | H(mm) | Fl(mm) | Keramiktyp | Verpackung | Vin | VOut1(V) | IOut1(A) | Vaux(V) | L(µH) | Qmin. | n | ISAT(A) | LS(µH) | VT(V (AC)) | Bauform | IC-Referenz | Muster | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WCAP-CSST Soft Termination, 2.2 nF, ±10% | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWCAP-CSST Soft Termination | Kapazität2.2 nF | Kapazität±10% | Nennspannung50 V (DC) | Betriebstemperatur -55 °C up to +125 °C | Verlustfaktor2.5 % | Isolationswiderstand10 GΩ | Länge2 mm | Breite1.25 mm | Höhe1.25 mm | Pad Dimension0.5 mm | KeramiktypX7R Klasse II | Verpackung7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | Bauform0805 | – | ||||
| WCAP-CSGP MLCCs 50 V(DC), 3.3 nF, ±10% | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWCAP-CSGP MLCCs 50 V(DC) | Kapazität3.3 nF | Kapazität±10% | Nennspannung50 V (DC) | Betriebstemperatur -55 °C up to +125 °C | Verlustfaktor2.5 % | Isolationswiderstand10 GΩ | Länge1.6 mm | Breite0.8 mm | Höhe0.8 mm | Pad Dimension0.4 mm | KeramiktypX7R Klasse II | Verpackung7" Tape & Reel | – | – | – | – | – | Güte [1]600 | – | – | – | – | Bauform0603 | – | |||||
 | WE-FB Sperrwandlerübertrager geeignet für LT3573/ LT3574/ LT3575/ LT3748, –, – | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | – | – | – | Betriebstemperatur -40 °C up to +125 °C | – | – | Länge27.03 mm | Breite32.31 mm | Höhe13.69 mm | – | – | – | Input Voltage 19 - 70 V (DC) | Ausgangsspannung 124 V | Ausgangsstrom 12.5 A | Hilfsspannung12 V | Induktivität20 µH | – | Übersetzungsverhältnis1.5:1:0.5 | Sättigungsstrom16 A | Streuinduktivität0.225 µH | Prüfspannung1500 V (AC) | BauformEFD25 | IC-ReferenzLT3748 |