NCP4390/NCV4390 Secondary Side Synchronous LLC Controller

The NCP4390/NCV4390 is an advanced secondary side controller for LLC resonant converters with Synchronous Rectification (SR). It features current mode control based on charge control, dual-edge adaptive dead time control, and is an upgrade of FAN7688. The controller offers benefits like excellent transient response, easy feedback loop design, best-in-class efficiency, and more. It is suitable for AC-DC power supplies, isolated DC-DC converters, automotive and industrial power systems.

• Secondary Side Controller
• Resonant Converter
• LLC
• Synchronous Rectification
• Power Management

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Uploaded on Jul 17, 2024 | 1 Views

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1. Secondary Side Synchronous LLC Controller NCP4390/NCV4390

2. NCP(V)4390 Secondary Side LLC Resonant Converter Controller with Sync Rectification NCP(V)4390 Secondary Side LLC Resonant Converter Controller with Sync Rectification Value Proposition Value Proposition 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. Unique Features Unique Features Benefits Benefits Typical Application Schematic Typical Application Schematic 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 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 VO SRDRV2 VIN SRDRV1 Q2 SR1DS PRDRV+ Other Features Other Features PRDRV- GND 5VB PWMS VDD Q1 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 PRDRV+ FMIN PROUT1 FB PROUT2 PRDRV- COMP SROUT1 SRDRV1 SS SROUT2 SRDRV2 ICS SR1DS SR1DS CS RDT Ordering & Package Information Ordering & Package Information Markets & Applications Markets & Applications AC-DC Power Supplies Isolated DC-DC Converters Automotive (OBC) & Industrial Power Systems OPN OPN Package Package SOIC-16 Narrow Body NCP4390DR2G 2

3. NCP4390 NCP4390 - - Typical Application Circuit Typical Application Circuit Half Bridge LLC converter The NCP4390 device NCP4390 device locates in the secondary side of an LLC converter Current sensing Current sensing primary-side current (current transformer) loop control + overcurrent Primary Primary- -side MOSFET drive side MOSFET drive (pulse transformer) controlling signal Voltage feedback Voltage feedback loop control + overvoltage Secondary side synchronous rectification synchronous rectification (SR) with dual edge tracking Half Bridge LLC converter VO SRDRV2 DC Input DC Input Voltage Voltage from PFC Battery Battery Regulated DC Output DC Output to Load Load VIN SRDRV1 Q2 PFC or SR1DS PRDRV+ PRDRV- GND 5VB Q1 PWMS VDD PRDRV+ FMIN PROUT1 FB PROUT2 PRDRV- COMP SRDRV1 SROUT1 SS SROUT2 SRDRV2 ICS SR1DS SR1DS CS RDT NCP4390 NCP4390 3

4. NCP4390 Special Features NCP4390 Special Features - - Closed Closed- -loop Soft loop Soft- -start Waveforms start Waveforms Soft Soft start currents and or expensive protection components to counteract this behavior; The NCP4390 allows setting an accurately controlled capacitor on the SS pin. start is an important feature of any converter application to avoid bad EMI, high inrush controlled startup startup slope slope by means of a simple small Soft Soft- -start at start at no load no load Soft Soft- -start at start at full load full load (21A) (21A) COMP Vss Vo Is 4

5. NCP4390 NCP4390 - - LLC Design Application Notes & Tools LLC Design Application Notes & Tools a) Half-Bridge LLC background technical information on LLC system theory and design steps to be followed; LLC Resonant Resonant Converter Converter Design Design Using Using NCP NCP4390 4390/NCV /NCV4390 4390 (AND90061), providing b) In tandem with spreadsheet LLC LLC Resonant Resonant Converter Converter Design Design Tool Tool for for NCP NCP4390 4390 & & FAN FAN7688 7688 (link); OUTPUTS OUTPUTS INPUTS INPUTS c) Similarly we have tools for design with the LLC controller NCP NCP13992 13992 (link). 5

6. NCV4390 NCV4390 - - Evaluation Board: LLC On Board Charger (OBC) Evaluation Board: LLC On Board Charger (OBC) - - 6.6kW SiC based 6.6kW SiC based Specifications Specifications AC in 90-265V 32A max. HV Output 200-450Vdc 20A max. VBus Full Bridge LLC NVHL060N090SC1 Full Bridge Rectifier FFSP3065A_F085 3Ch Interleave PFC NVHL030N090SC1 FFSP3065A_F085 Iin Sensing NCV210SQT2G IO Sensing NCV210SQT2G Drivers NCV57000 Io Monitor Control and Interface add on Board 3Ch PFC Controller & Drivers FAN9673Q NCV51705 Vo Monitor Current mode LLC Controller CC/CV Control NCV4390 NCV2003SN2T1G 12V dc PWM signal for CC/CV Control Auxiliary Power NCV1077 NCV890100PDR2G 15Vdc PWM signal for VBus Control Vin, Iin Monitor SEC SEC- -6D6KW 6D6KW- -OBC OBC- -SIC SIC- -GEVB GEVB 6