MFJ MFJ-4418 Instruction Manual Download Page 18 | Manualshive

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Figure 12 Control Section Schematic

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Summary of Contents for MFJ-4418

Page 1: ......

Page 2: ...10 THEORY OF OPERATION 13 Input Filtering 13 SMPS controller 14 MOSFET drivers and transformer 14 Output Filtering 14 Over voltage Protection 14 IN CASE OF DIFFICULTY 15 Low Voltage Disconnect trips u...

Page 3: ...418 gives you a choice of Anderson PowerPoleTM connectors or 5 way binding posts on the input and output Software Managed Adjustments The user through MFJ software can adjust the output voltage measur...

Page 4: ...nd output cables MFJ has cables available for the output side for use with most HF and VHF UHF radios 2 Prior to connecting the radio and battery plug the input and the output cables in to the MFJ 441...

Page 5: ...View 1 5 Way High Power Binding Post Negative Input 2 Anderson PowerPoleTM Input 3 5 Way High Power Binding Post Positive Input 4 5 Way High Power Binding Post Positive Output 5 Anderson PowerPoleTM...

Page 6: ...remote devices 7 USB The port to connect a computer for setting up the MFJ 4418 and monitoring the MFJ 4418 functions Not shown on the back side there is a ground lug available for chassis grounding C...

Page 7: ...ly through the EXTERNAL BOOST ENABLE connector allowing the unit to be enabled a number of ways including the ignition line and the radio amplifier key line There are a total of 4 control lines Two wi...

Page 8: ...oltage See Programming the MFJ 4418 section This mode does not require any connections to the radio and does not require the Boost Enable switch to be pushed in Any external connections or the Boost E...

Page 9: ...incoming voltage to 13 8V when enabled for any voltage between the minimum voltage and 13 8V If the incoming voltage is above what the output voltage is set to the output voltage will rise to the inc...

Page 10: ...ndows 10 i The default USB driver used by Windows 10 will work with the MFJ 4418 There is no need to run the MFJ 4418 Driver Installer program ii You can do a driver update by going to the Control Pan...

Page 11: ...power is interrupted prior to closing the USB port the changes will be lost d Input Voltage Output Voltage and Output Current These displays are updated every second and display in volts and amps e IN...

Page 12: ...the Enable High Limit is greater than the Enable Low Limit l Electronic Fuse This selects either fast or slow blow operation In fast blow the delay time is 1 10 second and in slow blow the delay time...

Page 13: ...nd Average Current Display It does not reset any other functions THEORY OF OPERATION Figure 10 Block Diagram Input Filtering The input filter consists of C13 which provides EMI filtering followed by L...

Page 14: ...the next power up cycle before the control IC takes control of the gate usually destroying one or both MOSFETs Output Filtering The output filter consists of toroid inductor L2 with capacitors C14 thr...

Page 15: ...e power is removed The high current led will blink indicating a high voltage fault occurred The CPU monitors for overcurrent and will shut down the power and boost function should the output current e...

Page 16: ...further reduce noise 1 or 2 turns through the bead will help TECHNICAL ASSISTANCE If you have any problem with this unit first check the appropriate section of this manual If the manual does not refer...

Page 17: ...Schematics Figure 11 SMPS Section Schematic...

Page 18: ...Figure 12 Control Section Schematic...

Page 19: ...Figure 13 CPU Section...

Page 20: ...of of purchase and a personal check cashiers check or money order must be provided to cover postage and handling Postage and handling may vary according to the weight of the product in question We als...

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