INN2124K Power Integrations InnoSwitch-CE Off-Line CV/CC Flyback Switcher IC
INN2124K is a 15W InnoSwitch-CE offline flyback switcher IC with 650V MOSFET, CV/CC control, 100kHz operation, and eSOP-R16B package.
Same model may have multiple batches, images only for reference.
Technical Specifications
INN2124K Power Integrations InnoSwitch-CE Off-Line CV/CC Flyback Switcher IC technical specifications.
General
Alternate Parts Comparison (INN2124K vs INN2125K-TL vs INN2004K-TL vs INN2003K-TL)
Side-by-side technical parameter comparison of related primary models in this product family.
| This Part | Alternate Parts | Alternate Parts | Alternate Parts | |
|---|---|---|---|---|
| Duty Cycle | 60% | 60% | 60% | 60% |
| Fault Protection | Over Temperature, Over | Over Temperature, Over | Current Limiting, Over Temperature, Over | Current Limiting, Over Temperature, Over |
| Internal Switch S | Yes | Yes | Yes | Yes |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 105°C (TA) | -40°C ~ 105°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Output Isolation | Isolated | Isolated | Isolated | Isolated |
| Package / Case | 16-PowerSOIC | 16-PowerSOIC | 16-PowerSOIC | 16-PowerSOIC |
| Power Watts | 15 W | 20 W | 15 W | 12 W |
| Supplier Device Package | -- | -- | -- | -- |
| Switching Frequency | 100kHz | 100kHz | 100kHz | 100kHz |
| Topology | Flyback, Secondary Side SR | Flyback, Secondary Side SR | Flyback, Secondary Side SR | Flyback, Secondary Side SR |
| Voltage Breakdown | 650V | 650V | 650V | 650V |
| Action |
INN2124K, INN2125K-TL, INN2004K-TL, and INN2003K-TL are all Power Integrations InnoSwitch-series offline flyback switcher ICs in the same 16-PowerSOIC / eSOP package family. INN2124K and INN2125K-TL are closer alternatives within the InnoSwitch-CE family, both intended for compact isolated CV/CC flyback power supply designs with integrated 650V MOSFET technology. INN2124K is suitable for 15W-class applications, while INN2125K-TL may be selected when a higher power/current design margin is required.
INN2004K-TL and INN2003K-TL are earlier or related InnoSwitch variants and should be compared carefully by output power, current limit, reference design, package suffix, and BOM compatibility before substitution. For new designs, choose the part according to required output power, thermal margin, switching performance, and availability; for replacement use, verify the exact suffix, PCB footprint, and datasheet parameters before purchase.
Power Integrations INN2124K Power Integrations InnoSwitch-CE Off-Line CV/CC Flyback Switcher IC Overview
The INN2124K is an off-line CV/CC flyback switcher IC from Power Integrations, designed for compact and efficient isolated power supplies. As part of the InnoSwitch-CE family, it integrates a 650 V power MOSFET, primary-side controller, secondary-side controller, sensing elements, and a safety-rated feedback mechanism into a single surface-mount package. This high level of integration helps reduce external component count, simplify power supply design, and improve manufacturing consistency.
The device supports isolated flyback converter designs with secondary-side synchronous rectification, making it suitable for low-voltage, high-current adapters, chargers, auxiliary supplies, and compact AC/DC power modules. Typical reference designs show its use in 15 W CV/CC isolated flyback power supplies, including 5 V / 3 A output applications.
Key Features
InnoSwitch-CE off-line CV/CC flyback switcher IC
Integrated 650 V high-voltage MOSFET
15 W output power class
Flyback topology with secondary-side synchronous rectification
100 kHz switching frequency
60% duty cycle
Isolated output architecture
Built-in fault protection including over-temperature and over-voltage protection
Surface-mount eSOP-R16B / 16-PowerSOIC package
Operating temperature range: -40°C to 105°C
Suitable for compact, high-efficiency AC/DC power supply designs
Target Applications
AC/DC adapters and chargers
Low-voltage, high-current power supplies
Isolated flyback power modules
Consumer electronics power supplies
Smart home and IoT power adapters
Set-top boxes, routers, and networking equipment
Auxiliary power supplies for appliances and industrial electronics
Compact CV/CC power supply designs
The INN2124K is a highly integrated offline flyback switcher IC for isolated CV/CC power supply designs. By combining a 650 V MOSFET, primary and secondary control circuitry, sensing functions, and feedback technology in a single package, it enables compact, efficient, and lower-component-count AC/DC converter designs. It is a practical choice for 15 W-class adapters, chargers, auxiliary supplies, and compact embedded power applications.
