Flyback Converter DC-DC Converter Chips
Last Updated: January 16, 2025 Reviewed by: Mohsen Mostafaei, consulting engineer
Description
A Flyback Converter DC-DC Converter Chip is an integrated circuit designed to control voltage conversion in switched-mode power supplies. It transforms input DC voltage to a different DC voltage level through electromagnetic storage and transfer mechanisms. These specialized chips incorporate control circuitry, switching elements, and protection features all within a single package to manage the entire flyback conversion process.
Working Principle
The flyback converter operates by storing energy in a transformer's primary winding during the switch-on period and transferring this energy to the secondary winding during the switch-off period. The integrated chip controls this switching action through pulse-width modulation, managing the duty cycle to maintain stable output voltage. The transformer also provides galvanic isolation between input and output, while the chip monitors and adjusts the switching frequency and duty cycle in real-time to compensate for load variations and input voltage fluctuations.
Applications
Flyback converter chips are extensively used in LED drivers for commercial lighting systems, particularly in smart building installations requiring precise dimming control. They're found in medical imaging equipment power supplies where isolation is critical, such as in MRI machine auxiliary systems. These chips are crucial components in modern electric vehicle charging stations, specifically in the 3.3kW to 6.6kW onboard chargers. They're also widely implemented in professional camera flash units, high-end smartphone fast chargers, and industrial automation control systems requiring multiple isolated outputs.
Advantages over other DC-DC Converter Chips
Flyback converter chips offer superior isolation capabilities compared to buck or boost converters, typically achieving isolation voltages up to 5000V. They can handle wider input voltage ranges, often supporting 85-265V AC input variations, making them more versatile than forward converters. These chips require fewer components than push-pull or half-bridge converters, reducing board space by up to 40%. They're particularly efficient at low power levels, achieving up to 94% efficiency in 20W-100W applications, where other topologies struggle to reach 85%.
Limitations
These chips exhibit reduced efficiency at higher power levels, typically above 200W, where forward converters become more practical. They suffer from higher output ripple voltage compared to buck converters, often requiring additional output filtering. The transformer design becomes increasingly complex at higher frequencies, limiting their practical switching frequency to about 200kHz in most applications. They also show increased electromagnetic interference due to higher peak currents in the transformer, requiring careful PCB layout and shielding considerations.
Considerations
Initial implementation costs are typically 15-30% higher than simpler buck converters due to the requirement for custom transformers and more sophisticated control circuitry. Operating expenses remain competitive due to high efficiency in their optimal power range, though transformer replacement may be necessary every 5-7 years in high-stress applications. Accuracy of voltage regulation is typically ±1% under normal conditions but can degrade to ±3% at temperature extremes. Maintenance costs primarily involve periodic inspection of electrolytic capacitors and thermal management systems, with replacement costs ranging from $50-200 depending on power rating and isolation requirements.
from Rochester Electronics
LTC3873 - No RSENSE Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller [See More]
- Configuration / Function: Flyback
from RS Components, Ltd.
5A 40V Boost/SEPIC/Flyback DC-DC HTSSOP [See More]
- Configuration / Function: Boost; Flyback; Flyback, sepic, step up
- Output Voltage Type: Adjustable / Variable
- Package Type: SSOP; Other; Htssop
from Win Source Electronics
Manufacturer: Texas Instruments. Storage Condition: Dry storage cabinet & Humidity protection package. Win Source Part Number: 1017456-TL5001AMFKB. Packaging: Rail/Tube. Length: 8.89 mm. Operating Supply Voltage: 40 V. Thickness: 1.83 mm. Height: 2.03 mm. Topology: Boost, Buck-Boost, Flyback,... [See More]
- Configuration / Function: Flyback
- IOUT: 0.0200
- Output Voltage: 50
from RS Components, Ltd.
DPASWITCH 13 W (36-75 Vin) DPA423PN [See More]
- Configuration / Function: Flyback; Forward; Flyback, forward
- Output Voltage Type: Fixed
- Package Type: DIP; Other; Dipb
from Win Source Electronics
Manufacturer: Rohm Semiconductor. Win Source Part Number: 769918-BD7682FJ-LBE2. Packaging: Reel package. Operating Temperature Range: -40 °C ~ 150 °C (TJ). Package: 8-SOIC (0.154", 3.90mm Width). Mounting: SMD. Output Isolation: Isolated. Internal Switch(s): No. Topology: Flyback. Voltage... [See More]
- Configuration / Function: Flyback
- Operating Temperature: -40 to 150
- Package Type: SOIC; Other; 8-SOIC (0.154", 3.90mm Width)
from RS Components, Ltd.
MAX17691AATC+, Voltage Regulator [See More]
- Configuration / Function: Flyback; Isolated flyback
- Output Voltage Type: Fixed
- Package Type: Other; Tdfn
from Win Source Electronics
Manufacturer: Rohm Semiconductor. Win Source Part Number: 770246-BM1050AF-GE2. Packaging: Reel package. Operating Temperature Range: -40 °C ~ 85 °C (TA). Package: 24-SOIC (0.213", 5.40mm Width). Mounting: SMD. Output Isolation: Isolated. Internal Switch(s): No. Topology: Flyback. Voltage -... [See More]
- Configuration / Function: Flyback
- Operating Temperature: -40 to 85
- Package Type: SOIC; Other; 24-SOIC (0.213", 5.40mm Width)
from Win Source Electronics
Manufacturer: Rohm Semiconductor. Win Source Part Number: 113006-BM1P102FJ-E2. Packaging: Reel - TR. Mounting: Surface Mount. Output Isolation: Either. Topology: Flyback. Voltage - Start Up: 13.5V. Duty Cycle: 75%. Frequency - Switching: 100kHz. Fault Protection: Current Limiting, Over Voltage. [See More]
- Configuration / Function: Flyback
- Operating Temperature: -40 to 85
- Package Type: Other; 8-SOP-J
from Win Source Electronics
Manufacturer: Rohm Semiconductor. Win Source Part Number: 806695-BM2P012. Packaging: Tube. Mounting Style: Through Hole. Output Isolation: Either. Internal Switch(s): Yes. Voltage - Breakdown: 650V. Topology: Flyback. Voltage - Start Up: 13.5V. Duty Cycle: 75%. Frequency - Switching: 65kHz. Fault... [See More]
- Configuration / Function: Flyback
- Operating Temperature: -40 to 105
- Package Type: DIP; Other; 8-DIP , 7 Leads
from Win Source Electronics
Manufacturer: Rohm Semiconductor. Win Source Part Number: 1153903-BM2P014. Packaging: Tube. Mounting Style: Through Hole. Operating Temperature Range: -40 °C ~ 105 °C (TA). Package: 8-DIP (0.300", 7.62mm), 7 Leads. Output Isolation: Either. Internal Switch(s): Yes. Voltage - Breakdown:... [See More]
- Configuration / Function: Flyback
- Operating Temperature: -40 to 105
- Package Type: DIP; Other; 8-DIP (0.300", 7.62mm), 7 Leads
from Win Source Electronics
Manufacturer: Rohm Semiconductor. Win Source Part Number: 805960-BM2P054F-GE2. Packaging: Reel. Mounting Style: Surface Mount. Output Isolation: Either. Internal Switch(s): Yes. Voltage - Breakdown: 650V. Topology: Flyback. Voltage - Start Up: 13.5V. Duty Cycle: 75%. Frequency - Switching: 65kHz. [See More]
- Configuration / Function: Flyback
- Operating Temperature: -40 to 105
- Package Type: SOIC; Other; 8-SOIC
from MORNSUN Guangzhou Science & Technology Co., Ltd.
DC/DC power supply controller ICs feature a controller with one or more integrated MOSFETs and an external inductor, they offer a balance of flexibility and ease of use. Both non-synchronous and synchronous buck converters simplify the design process by reducing external component count. At the same... [See More]
- Configuration / Function: Flyback
- Output Power: 5 to 40
- Package Type: Other; MSOP-8
from Utmel Electronic Limited
Conv DC-DC Single Boost/Flyback/SEPIC 2.9V to 32V 16-Pin WQFN T/R [See More]
- Configuration / Function: Flyback
- Output Voltage: 38
- Package Type: Other; 16-WFQFN Exposed Pad
- Input Voltage: 5