3.3 kW APM OBC Demo Board Test Report
2021-08-11
◆KEY FEATURES
■Whole Solution
●2CH Interleave PFC to get high efficiency and power density. Decrease the current ripple at mean time
●Full bridge LLC to boost efficiency by high bus voltage usage
●Flyback topology to supply as auxiliary power
●Hardware PFC and LLC control approach for easily designing and less malfunction.
●Full functional solution including input/output current/voltage sensing and CC/CV PWM control interface.
●AEC−Qualified APM to decrease PCB space and increase power density
■PFC Controller FAN9672
●Continuous Conduction Mode with Average Current Mode Control
●Two−Channel Interleave Operation
●Programmable Operation Frequency Range: 18 kHz~40 kHz or 55 kHz~75 kHz
●Programmable PFC Output Voltage
●Two Current−Limit Functions
●TriFault Detect Protects Against Feedback Loop Failure
●SAG Protection
●Programmable Soft−Start
●Under−Voltage Lockout (UVLO)
●Differential Current Sensing
■LLC Controller NCV4390 (AEC Qualified Version of FAN7688)
●Secondary Side PFM Controller for LLC Resonant Converter with Synchronous Rectifier Control
●Charge Current Control for Better Transient Response and Easy Feedback Loop Design
●Adaptive Synchronous Rectification Control with Dual Edge Tracking
●Closed Loop Soft−Start for Monotonic Rising Output
●Wide Operating Frequency (39 kHz~690 kHz)
●Green Functions to Improve Light−Load Efficiency
●Symmetric PWM Control at Light−Load to Limit the Switching Frequency while Reducing Switching Losses
●Protection Functions ( with Auto−Restart
▲Over−Current Protection (OCP)
▲Output Short Protection (OSP)
▲NON Zero−Voltage Switching Prevention (NZS) by Compensation Cutback (Frequency Shift)
▲Power Limit by Compensation Cutback (Frequency Shift)
▲Overload Protection (OLP) with Programmable Shutdown Delay Time
▲Over−Temperature Protection (OTP)
●Programmable Dead Times for Primary Side Switches and Secondary Side Synchronous Rectifiers
●VDD Under−Voltage Lockout (UVLO)
●Wide Operating Temperature Range −40℃ to +125℃
■PWM Controller NCV3843
●Trimmed Oscillator for Precise Frequency Control
●Oscillator Frequency Guaranteed at 250 kHz
●Current Mode Operation to 500 kHz
●Automatic Feed Forward Compensation
●Latching PWM for Cycle−By−Cycle Current Limiting
●Internally Trimmed Reference with Undervoltage Lockout
●High Current Totem Pole Output
●Undervoltage Lockout with Hysteresis
●Low Startup and Operating Current
■Whole Solution
●2CH Interleave PFC to get high efficiency and power density. Decrease the current ripple at mean time
●Full bridge LLC to boost efficiency by high bus voltage usage
●Flyback topology to supply as auxiliary power
●Hardware PFC and LLC control approach for easily designing and less malfunction.
●Full functional solution including input/output current/voltage sensing and CC/CV PWM control interface.
●AEC−Qualified APM to decrease PCB space and increase power density
■PFC Controller FAN9672
●Continuous Conduction Mode with Average Current Mode Control
●Two−Channel Interleave Operation
●Programmable Operation Frequency Range: 18 kHz~40 kHz or 55 kHz~75 kHz
●Programmable PFC Output Voltage
●Two Current−Limit Functions
●TriFault Detect Protects Against Feedback Loop Failure
●SAG Protection
●Programmable Soft−Start
●Under−Voltage Lockout (UVLO)
●Differential Current Sensing
■LLC Controller NCV4390 (AEC Qualified Version of FAN7688)
●Secondary Side PFM Controller for LLC Resonant Converter with Synchronous Rectifier Control
●Charge Current Control for Better Transient Response and Easy Feedback Loop Design
●Adaptive Synchronous Rectification Control with Dual Edge Tracking
●Closed Loop Soft−Start for Monotonic Rising Output
●Wide Operating Frequency (39 kHz~690 kHz)
●Green Functions to Improve Light−Load Efficiency
●Symmetric PWM Control at Light−Load to Limit the Switching Frequency while Reducing Switching Losses
●Protection Functions ( with Auto−Restart
▲Over−Current Protection (OCP)
▲Output Short Protection (OSP)
▲NON Zero−Voltage Switching Prevention (NZS) by Compensation Cutback (Frequency Shift)
▲Power Limit by Compensation Cutback (Frequency Shift)
▲Overload Protection (OLP) with Programmable Shutdown Delay Time
▲Over−Temperature Protection (OTP)
●Programmable Dead Times for Primary Side Switches and Secondary Side Synchronous Rectifiers
●VDD Under−Voltage Lockout (UVLO)
●Wide Operating Temperature Range −40℃ to +125℃
■PWM Controller NCV3843
●Trimmed Oscillator for Precise Frequency Control
●Oscillator Frequency Guaranteed at 250 kHz
●Current Mode Operation to 500 kHz
●Automatic Feed Forward Compensation
●Latching PWM for Cycle−By−Cycle Current Limiting
●Internally Trimmed Reference with Undervoltage Lockout
●High Current Totem Pole Output
●Undervoltage Lockout with Hysteresis
●Low Startup and Operating Current
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