Analog LTC4269-1 PoE+ PD Controller and Synchronous Flyback Reference Design (DC1335B-B)
Reference design for a 5V, 4.5A PoE+ powered device using the LTC4269-1 controller, featuring isolated flyback topology and synchronous rectification.
Overview
The DC1335B-B demonstration circuit is a high-power PoE+ (IEEE 802.3at) Powered Device (PD) interface and power supply featuring the LTC4269-1 controller. The board utilizes an isolated flyback topology with synchronous rectification to provide a regulated 5V output at currents up to 4.5A. It supports an input voltage range of 37V to 57V via PoE or 44V to 57V via an auxiliary wall adapter. The design features a two-stage filter for low differential mode emissions and achieves a typical efficiency of 91% at 50V input. The document includes performance specifications, setup instructions, thermal data, a comprehensive bill of materials, and full schematic diagrams.
Use Cases
- High-power PoE PD systems
- IP security cameras
- Wireless access points
- VoIP telephony
- Industrial network equipment
Topics
Referenced Parts
ETH1-230LB
Coilcraft
XFMR, POE PLUS, ETH1-230LD, COILCRAFT, ETH1-230LB
B1100-13-F
Diodes Inc.
DIODE, SCHOTTKY, 1A, SMA-DIODE
BAS21-7-F
Diodes Inc.
DIODE, FAST SWITCHING, SOT23
BAT54-7-F
Diodes Inc.
DIODE, SCHOTTKY, SOT23
S1B-13-F
Diodes Inc.
DIODE, 1A, PASSIVATED RECTIFIER
SMAJ58A-13-F
Diodes Inc.
DIODE, 58V, 400W, TVS, SMA-DIODE
LRC-LRF1206LF-01-R033-F
IRC
RES., CHIP, 0.033Ω, 1/8W, 1%, 1206
LTC4269IDKD-1
Linear Technology
IC, LTC4269IDKD-1, DFN32
GRM21BR71C105KA01
Murata
CAP., X7R, 1μF, 16V, 0805
GRM31CR60J226KE19
Murata
CAP., X5R, 22μF, 6.3V, 1206
GRM32ER72A225KA01
Murata
CAP., X7R, 2.2μF, 100V, 1210
PS2801-1-F3--L-A
NEC
IC, OPTOCOUPLERS PS2801-1-L, NEC, PS2801-1-F3--L-A
PDZ36B
NXP
DIODE, SMT ZENER, 36V, 400mW
ESVB21C106M
Neo Capacitor
CAP., TANT, 10μF, 16V, B2
PSLB20J107M(45
Neo Capacitor
CAP., TANT, 100μF, 6.3V, 3528
SS-6488-NF-K1
Stewart Connector Systems
CONN., RJ-45 RIGHT ANGLE, RJ45
CRCW060310K0JKEA
Vishay
RES., CHIP, 10k, 1/16W, 5%, 0603
CRCW060312K0JKEA
Vishay
RES., CHIP, 12k, 1/16W, 5%, 0603
CRCW060320K0JKEA
Vishay
RES., CHIP, 20k, 1/16W, 5%, 0603
CRCW060324K0JKEA
Vishay
RES., CHIP, 24k, 1/16W, 5%, 0603
8834
Keystone
STAND-OFF, NYLON (SNAP ON), 0.625” TALL, KEYSTONE, 8834
D2-9
Diodes
and signal pairs. Schottky diodes (D2-9) are used at the
SOT23
Diodes
17 2 D11, D16 DIODE, FAST SWITCHING, SOT23 DIODES INC., BAS21-7-F
SOT23
Diodes
18 1 D14 DIODE, SCHOTTKY, SOT23 DIODES INC., BAT54-7-F
400mW
NXP
8 1 D13 DIODE, SMT ZENER, 36V, 400mW NXP, PDZ36B
| 06035A330KAT2A | AVX | CAP., NPO, 33pF, 50V, 0603 |
| 06035C104KAT2A | AVX | CAP., X7R, 0.1μF, 50V, 0603 |
| 1808GC222MAT1A | AVX | CAP., X7R, 2200pF, 2KV, 1808 |
| DO1608C-103MLB | Coilcraft | INDUCTOR, 10μH, DO1608C-103MLB |
| DO1813H-181MLB | Coilcraft | INDUCTOR, 180μH, DO1813H-181MLB |
| FDS2582 | Fairchild | MOSFET, N-CH, 150V, 4.1A, SO8 |
| FDS8880 | Fairchild | MOSFET, N-CH, 30-V, SO8 |
| 2501-2-00-80-00-00-07-0 | Mill-Max | TP, TURRET, 0.094" |
| GRM21BR72A103KA01 | Murata | CAP., X7R, 0.01μF, 100V, 0805 |
| GRM31A7U2J220JW31D | Murata | CAP., NPO, 22pF, 200V, 1206 |
| NACEW100M100V6.3X8TR13F | NIC Components | CAP., ELEC., 10μF, 100V |
| ERJ3GEY0R00V | Panasonic | RES., CHIP, 0Ω, JUMPER, 0603 |
| LN1351C-(TR) | Panasonic | LED, SMT GREEN, LN1351C-(TR) |
| PA2369NL | Pulse | XFMR, FLYBACK, PA2369NL |
| PE-68386NL | Pulse | XFMR, GATE DRIVE PE-68386NL |
| CRCW0603100KFKEA | Vishay | RES., CHIP, 100k, 1/16W, 1%, 0603 |
| CRCW0603100RFKEA | Vishay | RES., CHIP, 100Ω, 1/16W, 1%, 0603 |
| CRCW0603107KFKEA | Vishay | RES., CHIP, 107k, 1/16W, 1%, 0603 |
| CRCW060310K0FKEA | Vishay | RES., CHIP, 10k, 1/16W, 1%, 0603 |
| CRCW060314K0FKEA | Vishay | RES., CHIP, 14.0k, 1/16W, 1%, 0603 |
| CRCW060315R0JNEA | Vishay | RES., CHIP, 15Ω, 1/16W, 5%, 0603 |
| CRCW06031K21FKEA | Vishay | RES., CHIP, 1.21k, 1/16W, 1%, 0603 |
| CRCW060327K4FKEA | Vishay | RES., CHIP, 27.4k, 1/10W, 1%, 0603 |
| CRCW060330R9FKEA | Vishay | RES., CHIP, 30.9Ω, 1/16W, 1%, 0603 |
| CRCW0603383KFKEA | Vishay | RES., CHIP, 383k, 1/16W, 1%, 0603 |
| CRCW060338K3FKEA | Vishay | RES., CHIP, 38.3k, 1/16W, 1%, 0603 |
| CRCW06033K01FKEA | Vishay | RES., CHIP, 3.01k, 1/16W, 1%, 0603 |
| CRCW060351K0FKEA | Vishay | RES., CHIP, 51k, 1/16W, 1%, 0603 |
| CRCW0603620RFKEA | Vishay | RES., CHIP, 620Ω, 1/16W, 1%, 0603 |
| CRCW060375R0JNEA | Vishay | RES., CHIP, 75Ω, 1/16W, 5%, 0603 |
| CRCW080520R0JNEA | Vishay | RES., CHIP, 20Ω, 1/10W, 5%, 0805 |
| CRCW1206150RJNEA | Vishay | RES., CHIP, 150Ω, 1/4W, 5%, 1206 |
| CRCW120639K0JNEA | Vishay | RES., CHIP, 39k, 1/4W, 5%, 1206 |
| CRCW12065R10JNEA | Vishay | RES., CHIP, 5.1Ω, 1/4W, 5%, 1206 |
| EPC3409G-LF | PCA Electronics | XFMR, FLYBACK, EPC3409G-LF |
| 06035C102JAT | AVX | CAP., X7R, 1000pF, 50V, 0603 |
| 06035C222JAT | AVX | CAP., X7R, 2200pF, 50V, 0603 |
| 06035C332JAT | AVX | CAP., X7R, 3300pF, 50V, 0603 |
| 08051C104JAT | AVX | CAP., X7R, 0.1μF, 100V, 0805 |
| 08055C152JAT | AVX | CAP., X7R, 1500pF, 50V, 0805 |
| 1808GC102MAT | AVX | CAP., X7R, 1000pF, 2KV, 1808 |
| BSS63LT1 | Onsemi | TRANSISTOR, PNP, SILICON POWER, SOT23, BSS63LT1 |
| MMBT3904 | Onsemi | TRANSISTOR, NPN, SILICON POWER, SOT23 |
| MMBT3906 | Onsemi | TRANSISTOR, PNP, SILICON POWER, SOT23 |
| ETH1-230LB | Coilcraft | XFMR, POE PLUS, ETH1-230LD, COILCRAFT, ETH1-230LB |
| B1100-13-F | Diodes Inc. | DIODE, SCHOTTKY, 1A, SMA-DIODE |
| BAS21-7-F | Diodes Inc. | DIODE, FAST SWITCHING, SOT23 |
| BAT54-7-F | Diodes Inc. | DIODE, SCHOTTKY, SOT23 |
| S1B-13-F | Diodes Inc. | DIODE, 1A, PASSIVATED RECTIFIER |
| SMAJ58A-13-F | Diodes Inc. | DIODE, 58V, 400W, TVS, SMA-DIODE |
| LRC-LRF1206LF-01-R033-F | IRC | RES., CHIP, 0.033Ω, 1/8W, 1%, 1206 |
| LTC4269IDKD-1 | Linear Technology | IC, LTC4269IDKD-1, DFN32 |
| GRM21BR71C105KA01 | Murata | CAP., X7R, 1μF, 16V, 0805 |
| GRM31CR60J226KE19 | Murata | CAP., X5R, 22μF, 6.3V, 1206 |
| GRM32ER72A225KA01 | Murata | CAP., X7R, 2.2μF, 100V, 1210 |
| PS2801-1-F3--L-A | NEC | IC, OPTOCOUPLERS PS2801-1-L, NEC, PS2801-1-F3--L-A |
| PDZ36B | NXP | DIODE, SMT ZENER, 36V, 400mW |
| ESVB21C106M | Neo Capacitor | CAP., TANT, 10μF, 16V, B2 |
| PSLB20J107M(45 | Neo Capacitor | CAP., TANT, 100μF, 6.3V, 3528 |
| SS-6488-NF-K1 | Stewart Connector Systems | CONN., RJ-45 RIGHT ANGLE, RJ45 |
| CRCW060310K0JKEA | Vishay | RES., CHIP, 10k, 1/16W, 5%, 0603 |
| CRCW060312K0JKEA | Vishay | RES., CHIP, 12k, 1/16W, 5%, 0603 |
| CRCW060320K0JKEA | Vishay | RES., CHIP, 20k, 1/16W, 5%, 0603 |
| CRCW060324K0JKEA | Vishay | RES., CHIP, 24k, 1/16W, 5%, 0603 |
| 8834 | Keystone | STAND-OFF, NYLON (SNAP ON), 0.625” TALL, KEYSTONE, 8834 |
| D2-9 | Diodes | and signal pairs. Schottky diodes (D2-9) are used at the |
| SOT23 | Diodes | 17 2 D11, D16 DIODE, FAST SWITCHING, SOT23 DIODES INC., BAS21-7-F |
| SOT23 | Diodes | 18 1 D14 DIODE, SCHOTTKY, SOT23 DIODES INC., BAT54-7-F |
| 400mW | NXP | 8 1 D13 DIODE, SMT ZENER, 36V, 400mW NXP, PDZ36B |