Secondary Side Synchronous LLC Controller
Description: Secondary Side Synchronous LLC Controller NCP4390NCV4390 NCP(V)4390 Secondary Side LLC Resonant Converter Controller with Sync Rectification Analog Charge Current Control Adaptive SR with Dual edge Tracking Green Functions i.e. Symmetric
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slide1. Secondary Side Synchronous LLC Controller NCP4390/NCV4390<br>
slide2. NCP(V)4390 Secondary Side LLC Resonant Converter Controller with Sync Rectification Analog Charge Current Control
Adaptive SR with Dual edge Tracking
Green Functions i.e. Symmetric PWM Control and SR Disabling at Light Load Condition
Closed Loop Soft Start The NCP(V)4390 is an advanced secondary side PFM controller for LLC resonant converters with Synchronous Rectification (SR). It employs a current mode control technique based on charge control simplifying the feedback loop design and allowing true input power limit. A dual edge tracking adaptive dead time control minimizes body diode conduction thus maximizing efficiency. The device is also an upgrade of FAN7688 in SOIC-16 NB package. Value Proposition Ordering & Package Information Other Features Markets & Applications AC-DC Power Supplies
Isolated DC-DC Converters
Automotive (OBC) & Industrial Power Systems Over Current Protection (OCP)
Output Short protection (OSP)
Non ZVS Prevention
Power Limit by Compensation Cutback
Overload Protection with Programmable Shutdown Delay
Wide Operating Temperature Range –40°C To 125°C No Need for Expensive, Complex MCU
Excellent Transient response and Easy feedback Loop Design
Best In Class Efficiency
Improved Light Load Efficiency
Monotonic Rising Output Voltage 2<br>
slide3. NCP4390 - Typical Application Circuit – Half Bridge LLC converter The NCP4390 device locates in the secondary side of an LLC converter
Current sensing primary-side current (current transformer) → loop control + overcurrent
Primary-side MOSFET drive (pulse transformer) → controlling signal
Voltage feedback → loop control + overvoltage
Secondary side synchronous rectification (SR) with dual edge tracking 3 DC Input Voltage from PFC or Battery Regulated DC Output to Load<br>
slide4. NCP4390 Special Features - Closed-loop Soft-start Waveforms Soft start is an important feature of any converter application to avoid bad EMI, high inrush currents and or expensive protection components to counteract this behavior;
The NCP4390 allows setting an accurately controlled startup slope by means of a simple small capacitor on the SS pin. 4<br>
slide5. NCP4390 - LLC Design Application Notes & Tools 5 Half-Bridge LLC Resonant Converter Design Using NCP4390/NCV4390 (AND90061), providing background technical information on LLC system theory and design steps to be followed;
In tandem with spreadsheet LLC Resonant Converter Design Tool for NCP4390 & FAN7688 (link);
Similarly we have tools for design with the LLC controller NCP13992 (link). INPUTS OUTPUTS<br>
slide6. 6 NCV4390 - Evaluation Board: LLC On Board Charger (OBC) - 6.6kW SiC based SEC-6D6KW-OBC-SIC-GEVB<br>
slide2. NCP(V)4390 Secondary Side LLC Resonant Converter Controller with Sync Rectification Analog Charge Current Control
Adaptive SR with Dual edge Tracking
Green Functions i.e. Symmetric PWM Control and SR Disabling at Light Load Condition
Closed Loop Soft Start The NCP(V)4390 is an advanced secondary side PFM controller for LLC resonant converters with Synchronous Rectification (SR). It employs a current mode control technique based on charge control simplifying the feedback loop design and allowing true input power limit. A dual edge tracking adaptive dead time control minimizes body diode conduction thus maximizing efficiency. The device is also an upgrade of FAN7688 in SOIC-16 NB package. Value Proposition Ordering & Package Information Other Features Markets & Applications AC-DC Power Supplies
Isolated DC-DC Converters
Automotive (OBC) & Industrial Power Systems Over Current Protection (OCP)
Output Short protection (OSP)
Non ZVS Prevention
Power Limit by Compensation Cutback
Overload Protection with Programmable Shutdown Delay
Wide Operating Temperature Range –40°C To 125°C No Need for Expensive, Complex MCU
Excellent Transient response and Easy feedback Loop Design
Best In Class Efficiency
Improved Light Load Efficiency
Monotonic Rising Output Voltage 2<br>
slide3. NCP4390 - Typical Application Circuit – Half Bridge LLC converter The NCP4390 device locates in the secondary side of an LLC converter
Current sensing primary-side current (current transformer) → loop control + overcurrent
Primary-side MOSFET drive (pulse transformer) → controlling signal
Voltage feedback → loop control + overvoltage
Secondary side synchronous rectification (SR) with dual edge tracking 3 DC Input Voltage from PFC or Battery Regulated DC Output to Load<br>
slide4. NCP4390 Special Features - Closed-loop Soft-start Waveforms Soft start is an important feature of any converter application to avoid bad EMI, high inrush currents and or expensive protection components to counteract this behavior;
The NCP4390 allows setting an accurately controlled startup slope by means of a simple small capacitor on the SS pin. 4<br>
slide5. NCP4390 - LLC Design Application Notes & Tools 5 Half-Bridge LLC Resonant Converter Design Using NCP4390/NCV4390 (AND90061), providing background technical information on LLC system theory and design steps to be followed;
In tandem with spreadsheet LLC Resonant Converter Design Tool for NCP4390 & FAN7688 (link);
Similarly we have tools for design with the LLC controller NCP13992 (link). INPUTS OUTPUTS<br>
slide6. 6 NCV4390 - Evaluation Board: LLC On Board Charger (OBC) - 6.6kW SiC based SEC-6D6KW-OBC-SIC-GEVB<br>