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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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 885382207005 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSST Soft Termination | 2.2 nF | ±10% | 50 | -55 °C up to +125 °C | 2.5 | 10 GΩ | 2 | 1.25 | 1.25 | 0.5 | X7R Class II | 7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | 0805 | – | ||
 | 885012206086 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 50 V(DC) | 3.3 nF | ±10% | 50 | -55 °C up to +125 °C | 2.5 | 10 GΩ | 1.6 | 0.8 | 0.8 | 0.4 | X7R Class II | 7" Tape & Reel | – | – | – | – | – | 600 | – | – | – | – | 0603 | – | ||
 | 750311783 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | – | – | – | -40 °C up to +125 °C | – | – | 27.03 | 32.31 | 13.69 | – | – | – | 19 - 70 V (DC) | 24 | 2.5 | 12 | 20 | – | 1.5:1:0.5 | 16 | 0.225 | 1500 | EFD25 | LT3748 |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 885382207005 | SPEC | |
| 885012206086 | SPEC | |
| 750311783 | SPEC |
| Samples |
|---|
| 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 |
|---|
