DC1947A: LT3799-1 Offline Isolated Flyback LED Driver with PFC
1A offline isolated flyback LED driver using LT3799-1. Supports 30V-50V LED strings and 90-277VAC input with >0.9 power factor and primary-side sensing.
Overview
The DC1947A demonstration circuit is an offline isolated flyback LED driver featuring the LT3799-1 controller. It provides a constant current output of 1A over an LED string voltage range of 30V to 50V. The circuit is designed for a universal input voltage range of 90VAC to 277VAC and maintains a power factor greater than 0.9. It utilizes boundary mode operation and primary-side current sensing to eliminate the need for an opto-coupler while maintaining tight regulation. The design is compliant with IEC 61000-3-2 Class C harmonics and EN55015B EMI standards, and includes protection for open-LED and shorted-LED faults.
Use Cases
- Universal input LED lighting
- Commercial LED luminaires
- Industrial lighting applications
- Offline LED power supplies
Topics
Referenced Parts
SS-5H-2.5A
Bussmann
FUSE, 2.5A
BAV20W-7-F
Diodes Inc.
DIODE, FAST SWITCHING
HD06-T
Diodes Inc.
RECTIFIER, BRIDGE 600V, 0.8A
PDU340-13
Diodes Inc.
DIODE, 3A Ultra-Fast REC., Power-DI-5
SMBJ170A-13-F
Diodes Inc.
DIODE, TVS, 600W, 170V, SMB
SMBJ48A-13-F
Diodes Inc.
DIODE, TVS, 600W, 48V, SMB
B82731H2701A030
EPCOS
CHOKE, D Code Double Choke
LT3799EMSE-1#PBF
Linear Technology
IC., Isolated Flyback Controller
63ZL330MEF
Rubycon
CAP, ELEC., 330μF, 63V, 20%
CV385K10R
Stackpole Electronics, Inc.
VARISTOR, 385V
CRCW080510KFKEA
Vishay
RES, CHIP., 10k, 1%, 1/8W, 0805
CRCW080520KFKEA
Vishay
RES, CHIP., 20k, 1%, 1/8W, 0805
CRCW080520R0JKEA
Vishay
RES, CHIP., 20, 5%, 1/8W, 0805
750817251
Wurth Elektronik
XFMR, FLYBACK
LT3799-1
Linear Technology
off-line isolated flyback LED driver featuring LTC® 3799-1
0.8A
Diodes
1 1 B1 RECTIFIER, BRIDGE 600V, 0.8A DIODES INC., HD06-T
Power-DI-5
Diodes
15 1 D3 DIODE, 3A Ultra-Fast REC., Power-DI-5 DIODES INC., PDU340-13
650V
Infineon
21 1 Q1 XSTR, MOSFET, N-CHANNEL 650V INFINEON, IPB60R165CP
1mH
TDK
19 1 L1 INDUCTOR, 1mH, TDK, TSL1315RA-102JR78-PF
| 0805YD475MAT2A | AVX | CAP, X5R, 4.7μF, 16V, 20%, 0805 |
| 12061C105KAT2A | AVX | CAP, X7R, 1μF, 100V, 10%, 1206 |
| CMR1U-10M | Central Semiconductor | DIODE, ULTRA FAST RECTIFIER |
| IPB60R165CP | Infineon | XSTR, MOSFET, N-CHANNEL 650V |
| GRM216R71H103KA01D | Murata | CAP, X7R, 0.01μF, 50V, 10%, 0805 |
| GRM21A7U2E152JW31D | Murata | CAP, U2J, 1.5nF, 250V, 5%, 0805 |
| 450MPH224K | Rubycon | CAP, FILM, 0.22μF, 450V, 10% |
| 50YXJ10M5X11 | Rubycon | CAP, 10μF, 20%, 50V, ALUM |
| TSL1315RA-102JR78-PF | TDK | INDUCTOR, 1mH |
| 440LD22-R | Vishay | CAP, 2.2nF, 10%, TYPE "Y1" |
| BFC233922104 | Vishay | CAP, 0.1μF, 310V, 20% |
| CRCW08050000Z0EA | Vishay | RES, CHIP., 0, 1/8W, 0805 |
| CRCW0805100KFKEA | Vishay | RES, CHIP., 100k, 1%, 1/8W, 0805 |
| CRCW0805150RFKEA | Vishay | RES, CHIP., 150, 1%, 1/8W, 0805 |
| CRCW0805200KFKEA | Vishay | RES, CHIP., 200k, 1%, 1/8W, 0805 |
| CRCW0805249KFKEA | Vishay | RES, CHIP., 249k, 1%, 1/4W, 1206 |
| CRCW08053K48FKEA | Vishay | RES, CHIP., 3.48k, 1%, 1/8W, 0805 |
| CRCW080540K2FKEA | Vishay | RES, CHIP., 40.2k, 1%, 1/8W, 0805 |
| CRCW08059K31FKEA | Vishay | RES, CHIP., 9.31k, 1%, 1/8W, 0805 |
| CRCW1206499KFKEA | Vishay | RES, CHIP., 499k, 1%, 1/4W, 1206 |
| CRCW1210200KFKEA | Vishay | RES, CHIP., 200k, 1%, 1/2W, 1210 |
| WSL1206R0300FEA | Vishay | RES, CHIP., 0.03, 1/4W, 1%, 1206 |
| 12061C105KAT2A | AVX | 12 1 C23 CAP, X7R, 1μF, 100V, 10%, 1206 AVX 12061C105KAT2A |
| 08055A470KAT | AVX | CAP, C0G, 47pF, 50V, 10%, 0805 |
| 08055A4R7BAQ2A | AVX | CAP, C0G, 4.7pF, 50V, 0805 |
| 1715250000 | Weidmuller | TERMINAL BLOCK, 2 POSITION |
| SS-5H-2.5A | Bussmann | FUSE, 2.5A |
| BAV20W-7-F | Diodes Inc. | DIODE, FAST SWITCHING |
| HD06-T | Diodes Inc. | RECTIFIER, BRIDGE 600V, 0.8A |
| PDU340-13 | Diodes Inc. | DIODE, 3A Ultra-Fast REC., Power-DI-5 |
| SMBJ170A-13-F | Diodes Inc. | DIODE, TVS, 600W, 170V, SMB |
| SMBJ48A-13-F | Diodes Inc. | DIODE, TVS, 600W, 48V, SMB |
| B82731H2701A030 | EPCOS | CHOKE, D Code Double Choke |
| LT3799EMSE-1#PBF | Linear Technology | IC., Isolated Flyback Controller |
| 63ZL330MEF | Rubycon | CAP, ELEC., 330μF, 63V, 20% |
| CV385K10R | Stackpole Electronics, Inc. | VARISTOR, 385V |
| CRCW080510KFKEA | Vishay | RES, CHIP., 10k, 1%, 1/8W, 0805 |
| CRCW080520KFKEA | Vishay | RES, CHIP., 20k, 1%, 1/8W, 0805 |
| CRCW080520R0JKEA | Vishay | RES, CHIP., 20, 5%, 1/8W, 0805 |
| 750817251 | Wurth Elektronik | XFMR, FLYBACK |
| LT3799-1 | Linear Technology | off-line isolated flyback LED driver featuring LTC® 3799-1 |
| 0.8A | Diodes | 1 1 B1 RECTIFIER, BRIDGE 600V, 0.8A DIODES INC., HD06-T |
| Power-DI-5 | Diodes | 15 1 D3 DIODE, 3A Ultra-Fast REC., Power-DI-5 DIODES INC., PDU340-13 |
| 650V | Infineon | 21 1 Q1 XSTR, MOSFET, N-CHANNEL 650V INFINEON, IPB60R165CP |
| 1mH | TDK | 19 1 L1 INDUCTOR, 1mH, TDK, TSL1315RA-102JR78-PF |