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STMicroelectronics PM8804TR | Demoboard DN0046
Power over ethernet - PD converter with 24 V 2.5 A output, synchronous flyback
Overview
| Topology | Flyback Converter |
| Input voltage | 36-46 V |
| Output 1 | 29 V / 25 A |
| IC revision | 1 |
Description
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
Features
- 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
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR(V (DC)) | Operating Temperature | DF(%) | RISO | L(mm) | W(mm) | H(mm) | Fl(mm) | Ceramic Type | Packaging | VIN | VOut1(V) | IOut1(A) | Vaux(V) | L(µH) | Qmin. | n | ISAT(A) | LS(µH) | VT(V (AC)) | Size | IC Reference | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WCAP-CSST Soft Termination, 2.2 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSST Soft Termination | Capacitance2.2 nF | Capacitance±10% | Rated Voltage50 V (DC) | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Length2 mm | Width1.25 mm | Height1.25 mm | Pad Dimension0.5 mm | Ceramic TypeX7R Class II | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | Size0805 | – | ||||
| WCAP-CSGP MLCCs 50 V(DC), 3.3 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance3.3 nF | Capacitance±10% | Rated Voltage50 V (DC) | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Ceramic TypeX7R Class II | Packaging7" Tape & Reel | – | – | – | – | – | Q-Factor [1]600 | – | – | – | – | Size0603 | – | |||||
 | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | – | – | – | Operating Temperature -40 °C up to +125 °C | – | – | Length27.03 mm | Width32.31 mm | Height13.69 mm | – | – | – | Input Voltage 19 - 70 V (DC) | Output Voltage 124 V | Output Current 12.5 A | Auxiliary Voltage12 V | Inductance20 µH | – | Turns Ratio1.5:1:0.5 | Saturation Current16 A | Leakage Inductance0.225 µH | Insulation Test Voltage1500 V (AC) | SizeEFD25 | IC ReferenceLT3748 |