DC/DC - Switching Regulator

MORNSUN DC DC switching regulator is the high efficiency non-isolated dcdc converter with the package of SIP, DIP, SMD or chassing mounting, and the efficiency is high up to 95%. The newest regulated output K78-R4 series released recently has undergone a fundamental change in dimension and packaging which manufactured via the chiplet SiP(system in package) process, and the appearance of R4 has changed from the simple and roughness to the refinement.

Switching Regulator
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Types of MORNSUN Switching Regulator

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Series Vin(VDC) Vout(VDC) Iout(mA) No. of Outputs Package Dimension(mm) Footprint & 3D Certification Datasheet Sample Buy
K78_MT-500R4 8~36 3.3~15 500 1 DFN 9.00*7.00*3.10 Download - - K78_MT-500R4 - sample request - buy on line -
K7803MT-500R4 4.5~36 3.3 500 1 DFN 9.00*7.00*3.10 3D MODEL Footprint PCB Symbol CE K7803MT-500R4 申请 buy on line
K7805MT-500R4 6.5~36 5 500 1 DFN 9.00*7.00*3.10 3D MODEL Footprint PCB Symbol CE K7805MT-500R4 申请 buy on line
K78X6MT-500R4 7~36 6.5 500 1 DFN 9.00*7.00*3.10 3D MODEL Footprint PCB Symbol CE K78X6MT-500R4 申请 buy on line
K7809MT-500R4 8~36 9 500 1 DFN 9.00*7.00*3.10 3D MODEL Footprint PCB Symbol CE K7809MT-500R4 申请 buy on line
K7812MT-500R4 8~36 12 500 1 DFN 9.00*7.00*3.10 3D MODEL Footprint PCB Symbol CE K7812MT-500R4 申请 buy on line
K7815MT-500R4 8~36 15 500 1 DFN 9.00*7.00*3.10 3D MODEL Footprint PCB Symbol CE K7815MT-500R4 申请 buy on line
K78_MT-1000R4 4.75~36 3.3~15 1000 1 DFN 9.00*7.00*3.10 Download - - K78_MT-1000R4 - sample request - buy on line -
K7803MT-1000R4 4.75~36 3.3 1000 1 DFN 9.00*7.00*3.10 Footprint PCB Symbol - K7803MT-1000R4 申请 buy on line
K7805MT-1000R4 6.5~36 5 1000 1 DFN 9.00*7.00*3.10 Footprint PCB Symbol - K7805MT-1000R4 申请 buy on line
K78X6MT-1000R4 8~36 6.5 1000 1 DFN 9.00*7.00*3.10 Footprint PCB Symbol - K78X6MT-1000R4 申请 buy on line
K7809MT-1000R4 8~36 9 1000 1 DFN 9.00*7.00*3.10 Footprint PCB Symbol - K7809MT-1000R4 申请 buy on line
K7812MT-1000R4 8~36 12 1000 1 DFN 9.00*7.00*3.10 Footprint PCB Symbol - K7812MT-1000R4 申请 buy on line
K7815MT-1000R4 8~36 15 1000 1 DFN 9.00*7.00*3.10 Footprint PCB Symbol - K7815MT-1000R4 申请 buy on line
K78xxW-500R3 4.75~36 3.3~15 500 1 Chassis 11.50*9.00*17.50 Download - CE - K78xxW-500R3 - sample request - buy on line -
K7803W-500R3 4.75~36 3.3 500 1 Chassis 11.50*9.00*17.50 3D MODEL CE K7803W-500R3 申请 buy on line
K7805W-500R3 6.5~36 5 500 1 Chassis 11.50*9.00*17.50 3D MODEL CE K7805W-500R3 申请 buy on line
K7809W-500R3 12~36 9 500 1 Chassis 11.50*9.00*17.50 3D MODEL CE K7809W-500R3 申请 buy on line
K7812W-500R3 8~36 12 500 1 Chassis 11.50*9.00*17.50 3D MODEL CE K7812W-500R3 申请 buy on line
K7815W-500R3 8~36 15 500 1 Chassis 11.50*9.00*17.50 3D MODEL CE K7815W-500R3 申请 buy on line
K78_T-500R3 4.75~36 1.5~6.5 500 1 SMD 15.24*11.40*8.25 Download - - K78_T-500R3 - sample request - buy on line -
K7801T-500R3 4.75~28 1.5 500 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7801T-500R3 申请 buy on line
K78X2T-500R3 4.75~28 1.8 500 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K78X2T-500R3 申请 buy on line
K7802T-500R3 4.75~32 2.5 500 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7802T-500R3 申请 buy on line
K7803T-500R3 4.75~36 3.3 500 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7803T-500R3 申请 buy on line
K7805T-500R3 6.5~36 5 500 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7805T-500R3 申请 buy on line
K78X6T-500R3 8~36 6.5 500 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K78X6T-500R3 申请 buy on line
K7809T-500R3 12~36 9 500 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7809T-500R3 申请 buy on line
K7812T-500R3 15~36 12 500 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7812T-500R3 申请 buy on line
K7815T-500R3 19~36 15 500 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7815T-500R3 申请 buy on line
K78_JT-500R3 4.75~36 3.3~15 500 1 SMD(without housing) 12.50*13.50*3.50 Download - CE - K78_JT-500R3 - sample request - buy on line -
K7803JT-500R3 4.75~36 3.3 500 1 SMD(without housing) 12.50*13.50*3.50 3D MODEL Footprint PCB Symbol CE K7803JT-500R3 申请 buy on line
K7805JT-500R3 6.5~36 5 500 1 SMD(without housing) 12.50*13.50*3.50 3D MODEL Footprint PCB Symbol CE K7805JT-500R3 申请 buy on line
K7809JT-500R3 12~36 9 500 1 SMD(without housing) 12.50*13.50*3.50 3D MODEL Footprint PCB Symbol CE K7809JT-500R3 申请 buy on line
K7812JT-500R3 15~36 12 500 1 SMD(without housing) 12.50*13.50*3.50 3D MODEL Footprint PCB Symbol CE K7812JT-500R3 申请 buy on line
K7815JT-500R3 19~36 15 500 1 SMD(without housing) 12.50*13.50*3.50 3D MODEL Footprint PCB Symbol CE K7815JT-500R3 申请 buy on line
K78Lxx-500R3 4.75~36 3.3~15 500 1 SIP(without housing) 10.00*7.20*11.00 Download - CE UL CB - K78Lxx-500R3 - sample request - buy on line -
K78L03-500R3 4.75~36 3.3 500 1 SIP(without housing) 10.00*7.20*11.00 3D MODEL CE UL CB K78L03-500R3 申请 buy on line
K78L05-500R3 6.5~36 5 500 1 SIP(without housing) 10.00*7.20*11.00 3D MODEL CE UL CB K78L05-500R3 申请 buy on line
K78L12-500R3 15~36 12 500 1 SIP(without housing) 10.00*7.20*11.00 3D MODEL CE UL CB K78L12-500R3 申请 buy on line
K78L15-500R3 19~36 15 500 1 SIP(without housing) 10.00*7.20*11.00 3D MODEL CE UL CB K78L15-500R3 申请 buy on line
K78xx-500R3 4.75~36 3.3~15 500 1 SIP 11.60*7.55*10.16 Download - CE UL CB - K78xx-500R3 - sample request - buy on line -
K7803-500R3 4.75~36 3.3 500 1 SIP 11.60*7.55*10.16 3D MODEL Footprint PCB Symbol CE UL CB K7803-500R3 申请 buy on line
K7809-500R3 12~36 9 500 1 SIP 11.60*7.55*10.16 3D MODEL Footprint PCB Symbol CE UL CB K7809-500R3 申请 buy on line
K7812-500R3 15~36 12 500 1 SIP 11.60*7.55*10.16 3D MODEL Footprint PCB Symbol CE UL CB K7812-500R3 申请 buy on line
K7815-500R3 19~36 15 500 1 SIP 11.60*7.55*10.16 3D MODEL Footprint PCB Symbol CE UL CB K7815-500R3 申请 buy on line
K7805-500R3 6.5~36 5 500 1 SIP 11.60*7.55*10.16 3D MODEL CE UL CB K7805-500R3 申请 buy on line
K78(L)04-1000R3 8~36 4 1000 1 SIP 17.50*11.50*9.00 - - K78(L)04-1000R3 - sample request - buy on line -
K7804-1000R3 8~36 4 1000 1 SIP 17.50*11.50*9.00 - - K7804-1000R3 申请 buy on line
K78L04-1000R3 8~36 4 1000 1 SIP(without housing) 17.50*11.50*7.50 - - K78L04-1000R3 申请 buy on line
K78xx-1000R3(L) 6~36 3.6~15 1000 1 SIP 11.50*9.00*17.50 Download - CE UL - K78xx-1000R3(L) - sample request - buy on line -
K7803-1000R3 6~36 3.3 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7803-1000R3 申请 buy on line
K7805-1000R3 8~36 5 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7805-1000R3 申请 buy on line
K7805-1000R3L 8~36 5 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7805-1000R3L 申请 buy on line
K7809-1000R3 13~36 9 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7809-1000R3 申请 buy on line
K7809-1000R3L 13~36 9 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7809-1000R3L 申请 buy on line
K7812-1000R3 16~36 12 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7812-1000R3 申请 buy on line
K7812-1000R3L 16~36 12 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7812-1000R3L 申请 buy on line
K7815-1000R3 16~36 15 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7815-1000R3 申请 buy on line
K7815-1000R3L 16~36 15 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7815-1000R3L 申请 buy on line
K7803-1000R3L 6~36 3.3 1000 1 SIP 11.50*9.00*17.50 3D MODEL CE UL K7803-1000R3L 申请 buy on line
K78_T-1000R3 4.75~36 1.5~6.5 1000 1 SMD 15.24*11.40*8.25 Download - - K78_T-1000R3 - sample request - buy on line -
K7801T-1000R3 4.75~32 1.5 1000 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7801T-1000R3 申请 buy on line
K78X2T-1000R3 4.75~32 1.8 1000 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K78X2T-1000R3 申请 buy on line
K7802T-1000R3 4.75~32 2.5 1000 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7802T-1000R3 申请 buy on line
K7803T-1000R3 6.5~36 3.3 1000 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7803T-1000R3 申请 buy on line
K7805T-1000R3 8~36 5 1000 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7805T-1000R3 申请 buy on line
K78X6T-1000R3 10~36 6.5 1000 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K78X6T-1000R3 申请 buy on line
K7809T-1000R3 13~36 9 1000 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7809T-1000R3 申请 buy on line
K7812T-1000R3 16~36 12 800 1 SMD 15.24*11.40*8.25 3D MODEL Footprint PCB Symbol - K7812T-1000R3 申请 buy on line
K78Lxx-1000R3 6~36 3.3~15 1000 1 SIP(without housing) 11.50*7.50*17.50 Download - CE UL - K78Lxx-1000R3 - sample request - buy on line -
K78L03-1000R3 6~36 3.3 1000 1 SIP(without housing) 11.50*7.50*17.50 3D MODEL CE UL K78L03-1000R3 申请 buy on line
K78L12-1000R3 16~36 12 1000 1 SIP(without housing) 11.50*7.50*17.50 3D MODEL CE UL K78L12-1000R3 申请 buy on line
K78L05-1000R3 8~36 5 1000 1 SIP(without housing) 11.50*7.50*17.50 3D MODEL CE UL K78L05-1000R3 申请 buy on line
K78L15-1000R3 20~36 15 1000 1 SIP(without housing) 11.50*7.50*17.50 3D MODEL CE UL K78L15-1000R3 申请 buy on line
K78xxM-1000R3 6~36 3.3~15 1000 1 SIP 11.60*8.00*10.40 Download - CE - K78xxM-1000R3 - sample request - buy on line -
K7803M-1000R3 6~36 3.3 1000 1 SIP 11.60*8.00*10.40 3D MODEL Footprint PCB Symbol CE K7803M-1000R3 申请 buy on line
K7805M-1000R3 8~36 5 1000 2 SIP 11.60*8.00*10.40 3D MODEL Footprint PCB Symbol CE K7805M-1000R3 申请 buy on line
K7809M-1000R3 13~36 9 1000 1 SIP 11.60*8.00*10.40 3D MODEL Footprint PCB Symbol CE K7809M-1000R3 申请 buy on line
K78X6M-1000R3 10~36 6.5 1000 1 SIP 11.60*8.00*10.40 3D MODEL Footprint PCB Symbol CE K78X6M-1000R3 申请 buy on line
K7812M-1000R3 16~36 12 1000 1 SIP 11.60*8.00*10.40 3D MODEL Footprint PCB Symbol CE K7812M-1000R3 申请 buy on line
K7815M-1000R3 20~36 15 1000 2 SIP 11.60*8.00*10.40 3D MODEL Footprint PCB Symbol CE K7815M-1000R3 申请 buy on line
K78xx-2000R3 4.5~36 2.5~15 2000 1 SIP 11.50*9.00*17.50 Download - CE - K78xx-2000R3 - sample request - buy on line -
K7802-2000R3 4.5~36 2.5 2000 1 SIP 11.50*9.00*17.50 Footprint PCB Symbol CE K7802-2000R3 申请 buy on line
K7803-2000R3 6~36 3.3 2000 1 SIP 11.50*9.00*17.50 Footprint PCB Symbol CE K7803-2000R3 申请 buy on line
K7805-2000R3 8~36 5 2000 1 SIP 11.50*9.00*17.50 Footprint PCB Symbol CE K7805-2000R3 申请 buy on line
K7809-2000R3 13~36 9 2000 1 SIP 11.50*9.00*17.50 Footprint PCB Symbol CE K7809-2000R3 申请 buy on line
K7812-2000R3 16~36 12 2000 1 SIP 11.50*9.00*17.50 Footprint PCB Symbol CE K7812-2000R3 申请 buy on line
K7815-2000R3 18~36 15 2000 1 SIP 11.50*9.00*17.50 Footprint PCB Symbol CE K7815-2000R3 申请 buy on line
K7803-2000R3L 6~36 3.3 2000 1 SIP(Bent foot) 11.50*9.00*17.50 3D MODEL CE K7803-2000R3L 申请 buy on line
K7805-2000R3L 8~36 5 2000 1 SIP(Bent foot) 11.50*9.00*17.50 3D MODEL CE K7805-2000R3L 申请 buy on line
K7812-2000R3L 16~36 12 2000 1 SIP(Bent foot) 11.50*9.00*17.50 3D MODEL CE K7812-2000R3L 申请 buy on line
K12T-6A 8.3~14 0.75~5 6000 1 SMD 20.30*11.40*6.60 - - K12T-6A - sample request - buy on line -
K12T-6A-P 8.3~14 0.75~5 6000 1 SMD 20.30*11.40*6.60 - CE K12T-6A-P 申请 buy on line
K12T-6A-N 8.3~14 0.75~5 6000 1 SMD 20.30*11.40*6.60 - CE K12T-6A-N 申请 buy on line
K12T-10A 8.3~14 0.75~5 10000 1 SMD 33.00*13.50*8.30 - - K12T-10A - sample request - buy on line -
K12T-10A-P 8.3~14 0.75~5 10000 1 SMD 33.00*13.50*8.30 3D MODEL CE K12T-10A-P 申请 buy on line
K12T-10A-N 8.3~14 0.75~5 10000 1 SMD 33.00*13.50*8.30 3D MODEL CE K12T-10A-N 申请 buy on line
K12T-16A 8.3~14 0.75~5 16000 1 SMD 33.00*13.50*8.30 - - K12T-16A - sample request - buy on line -
K12T-16A-P 8.3~14 0.75~5 16000 1 SMD 33.00*13.50*8.30 3D MODEL CE K12T-16A-P 申请 buy on line
K12T-16A-N 8.3~14 0.75~5 16000 1 SMD 33.00*13.50*8.30 3D MODEL CE K12T-16A-N 申请 buy on line
KUB48_QB-10A 16~75 12,24 10000 1 DIP 59.20*37.60*13.00 Download - CE - KUB48_QB-10A - sample request - buy on line -
KUB4812QB-10A 16~75 12 10000 1 DIP 59.20*37.60*13.00 3D MODEL Footprint PCB Symbol CE KUB4812QB-10A 申请 buy on line
KUB4824QB-10A 30~75 24 10000 1 DIP 59.20*37.60*13.00 3D MODEL Footprint PCB Symbol CE KUB4824QB-10A 申请 buy on line
K78Lxx-3AR3 8~36 3.3~15 3000 1 SIP 32.15*14.85*9.05 Download - CE - K78Lxx-3AR3 - sample request - buy on line -
K78L03-3AR3 8~36 3.3 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K78L03-3AR3 申请 buy on line
K78L05-3AR3 8~36 5 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K78L05-3AR3 申请 buy on line
K78LX6-3AR3 10~36 6.5 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K78LX6-3AR3 申请 buy on line
K78L09-3AR3 13~36 9 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K78L09-3AR3 申请 buy on line
K78L12-3AR3 16~36 12 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K78L12-3AR3 申请 buy on line
K78L15-3AR3 19~36 15 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K78L15-3AR3 申请 buy on line
K78xx-3AR3 8~36 3.3~15 3000 1 SIP 32.15*14.85*9.05 Download - CE - K78xx-3AR3 - sample request - buy on line -
K7803-3AR3 8~36 3.3 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K7803-3AR3 申请 buy on line
K7805-3AR3 8~36 5 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K7805-3AR3 申请 buy on line
K78X6-3AR3 10~36 6.5 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K78X6-3AR3 申请 buy on line
K7809-3AR3 13~36 9 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K7809-3AR3 申请 buy on line
K7812-3AR3 16~36 12 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K7812-3AR3 申请 buy on line
K7815-3AR3 19~36 15 3000 1 SIP 32.15*14.85*9.05 3D MODEL Footprint PCB Symbol CE K7815-3AR3 申请 buy on line
K78xx-2000R3L 4.5~36 3.3~12 2000 1 SIP 11.50*9.00*17.50 Download - CE - K78xx-2000R3L - sample request - buy on line -
K7803-2000R3L 6~36 3.3 2000 1 SIP(Bent foot) 11.50*9.00*17.50 PCB Symbol CE K7803-2000R3L 申请 buy on line
K7805-2000R3L 8~36 5 2000 1 SIP(Bent foot) 11.50*9.00*17.50 PCB Symbol CE K7805-2000R3L 申请 buy on line
K7812-2000R3L 16~36 12 2000 1 SIP(Bent foot) 11.50*9.00*17.50 PCB Symbol CE K7812-2000R3L 申请 buy on line

* For reference only. The detailed info please refer to the datasheet.

Series
K78_MT-500R4
K7803MT-500R4
K7805MT-500R4
K78X6MT-500R4
K7809MT-500R4
K7812MT-500R4
K7815MT-500R4
K78_MT-1000R4
K7803MT-1000R4
K7805MT-1000R4
K78X6MT-1000R4
K7809MT-1000R4
K7812MT-1000R4
K7815MT-1000R4
K78xxW-500R3
K7803W-500R3
K7805W-500R3
K7809W-500R3
K7812W-500R3
K7815W-500R3
K78_T-500R3
K7801T-500R3
K78X2T-500R3
K7802T-500R3
K7803T-500R3
K7805T-500R3
K78X6T-500R3
K7809T-500R3
K7812T-500R3
K7815T-500R3
K78_JT-500R3
K7803JT-500R3
K7805JT-500R3
K7809JT-500R3
K7812JT-500R3
K7815JT-500R3
K78Lxx-500R3
K78L03-500R3
K78L05-500R3
K78L12-500R3
K78L15-500R3
K78xx-500R3
K7803-500R3
K7809-500R3
K7812-500R3
K7815-500R3
K7805-500R3
K78(L)04-1000R3
K7804-1000R3
K78L04-1000R3
K78xx-1000R3(L)
K7803-1000R3
K7805-1000R3
K7805-1000R3L
K7809-1000R3
K7809-1000R3L
K7812-1000R3
K7812-1000R3L
K7815-1000R3
K7815-1000R3L
K7803-1000R3L
K78_T-1000R3
K7801T-1000R3
K78X2T-1000R3
K7802T-1000R3
K7803T-1000R3
K7805T-1000R3
K78X6T-1000R3
K7809T-1000R3
K7812T-1000R3
K78Lxx-1000R3
K78L03-1000R3
K78L12-1000R3
K78L05-1000R3
K78L15-1000R3
K78xxM-1000R3
K7803M-1000R3
K7805M-1000R3
K7809M-1000R3
K78X6M-1000R3
K7812M-1000R3
K7815M-1000R3
K78xx-2000R3
K7802-2000R3
K7803-2000R3
K7805-2000R3
K7809-2000R3
K7812-2000R3
K7815-2000R3
K7803-2000R3L
K7805-2000R3L
K7812-2000R3L
K12T-6A
K12T-6A-P
K12T-6A-N
K12T-10A
K12T-10A-P
K12T-10A-N
K12T-16A
K12T-16A-P
K12T-16A-N
KUB48_QB-10A
KUB4812QB-10A
KUB4824QB-10A
K78Lxx-3AR3
K78L03-3AR3
K78L05-3AR3
K78LX6-3AR3
K78L09-3AR3
K78L12-3AR3
K78L15-3AR3
K78xx-3AR3
K7803-3AR3
K7805-3AR3
K78X6-3AR3
K7809-3AR3
K7812-3AR3
K7815-3AR3
K78xx-2000R3L
K7803-2000R3L
K7805-2000R3L
K7812-2000R3L

Switching Regulator-FAQs

How to meet the requirement for ripple & noise when using low-power converters?

Low-power converters have a higher requirement for ripple & noise which need further filtering. 

There are the following measures: 

(1) add a capacitor at the output terminal (the function of the capacitor is to further lower ripple & noise with a relatively low frequency); 

2) add a PI filter at the output terminal by filtering methods of capacitor + DM inductor + capacitor  OR capacitor + CM inductor + capacitor (this method lowers ripple & noise at the same time. If the frequency of the noise is high, it is recommended to use the pattern of capacitor + CM inductor + capacitor);

 (3) customers can choose a power module whose output voltage is one grade higher and add an LDO to reduce ripple & noise (for instance, customers practically need a 3.3V output power module but there are demanding requirements for ripple & noise. Please recommend customer to choose a 5V output power module and add an LDO to lower it to 3.3V, and the LDO can lower ripple & noise).

What are the minimum starting current and input current of a module?

The starting current of a module is generally about 1.4-1.6 times that of the Iin (max). The increase of capacitive load of the output terminal will also increase the starting current value of the module. It is recommended to select the forestage power supply with higher power. For the minimum input current in the unloading condition, please check the ‘No-load current’ section in the datasheet of the corresponding module.

The module fails to start up when the capacitive load is relatively large. How to solve it?

In practical application, the capacitive load exceeds the maximum capacitive load of operating module. In addition, when the output capacitance is extremely large, large starting current is required at the moment of start-up, resulting in the failure of starting the module.

It is recommended to decrease the connected capacitance of the output terminal or add a buffer circuit at the output terminal to improve the capacity of the module to withstand capacitive load

What problems will be caused and how to avoid them if a module starts up with an input voltage lower than the minimum rated one?

The module may be damaged when it starts up at a voltage that is lower than that of input voltage range. Because there is no under-voltage protective circuits for the wide input voltage converters. 

The starting voltage should be determined on the basis of the threshold voltage of MOSFET and soft starting circuit, and the starting voltage of the MOSFET is 2V or more lower than that of the minimum input voltage of the module.

In this circumstance, lower voltage input requires higher input current so as to supply equal power; the power module is susceptible to damage in a higher input current condition.

(1) It should be ensured that the actual input voltage is in the rated range specified in the datasheet; 

(2) it is recommended to add an input under-voltage protective circuit on the front-terminal of the module in accordance with the Wide Input Voltage DC/DC Converter Application Guide.

Why is there high noise when the fixed input voltage product is used as the power source of the relay?

There is high reflected ripple during the operation of the relay. 

It is recommended to implement some filtering measures or add a Y capacitor between the input and output grounds.

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