LNK6425D
Energy-Efficient, Accurate Primary-Side Regulation CV/CC Switcher for Adapters and Chargers
Applications
Product Details
The LinkSwitch-3 family of ICs dramatically simplifies low power CV/CC charger designs by eliminating an optocoupler and secondary control circuitry. The device introduces a revolutionary control technique to provide very accurate output voltage and current regulation, compensating for transformer and internal parameter tolerances along with input voltage variations.
The device incorporates a 725 V power MOSFET, a novel ON/OFF control state machine, a high-voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry onto a monolithic IC.
Product Highlights
Dramatically Simplifies CV/CC Converters
- Eliminates optocoupler and all secondary CV/CC control circuitry
- Eliminates all control loop compensation circuitry
Advanced Performance Features
- Compensates for transformer inductance tolerances, input line voltage variations, and cable voltage drop
- Very tight IC parameter tolerances using proprietary trimming technology
- Frequency jittering greatly reduces EMI filter cost
- Programmable switching frequency up to 85 kHz to reduce transformer size
- Minimum operation frequency fixed to improve transient load response
Advanced Protection/Safety Features
- Hysteretic thermal shutdown – automatic recovery reduces power supply returns from the field
- Meets high-voltage creepage requirements between DRAIN and all other pins both on the PCB and at the package
EcoSmart– Energy Efficient
- Easily meets all global energy efficiency regulations with no added components
- No-load consumption at 230 VAC input with bias winding <30 mW
Green Package
- Halogen free and RoHS compliant package
Specifications
| Output Power (Max) - Enclosed, Univ | 4.50 W |
| Output Power (Max) - Open Frame, Univ | 5.10 W |
| Switching Frequency (min) | 60.00 kHz |
| Switching Frequency (max) | 85 kHz |
| Breakdown Voltage | 725 V |
| Voltage - Input (Min) | 90 V |
| Voltage - Input (Max) | 264 V |
| Cable Drop Compensation | 1.06 |
| IC Package | SO-8C |
| Internal Switch | Yes |
| Mounting Type | Surface Mount |
| Over-Temperature Response | Hysteretic |
| Temperature - Operating (Min) | -40 °C |
| Temperature - Operating (Max) | 150 °C |
| Control Scheme | Primary-side |
| Control Features |
Cable Drop Compensation
Selectable Current Limit
Frequency Jittering
Programmable Switching Frequency
Auto-Restart/Latching Fault Response
On/Off Control
|
| Protection Features |
Output Open Loop
Output Short Circuit
Overtemperature
|
| Output Profile | CV/CC |
| Topology | Flyback |
| Product Sub-Type | PMIC |
