DC/DC Converter

MORNSUN DC DC converter includes isolated DC DC converter, non isolated DC DC converter and high voltage output with the package of SMD, SIP, DIP and other optional mounting, and the range is from 0.25 to 200W. MORNSUN DC DC power converter can be widely used in industrial control, medical devices, power electronics, instrumentation, rail transportation, communications, etc. We hope that those high-efficiency, excellent-quality, and cost-effective DC DC converter power supply is an ideal fit for your application needs.

DC/DC Converter
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Series Power(W) Vin(VDC) Vout(VDC) No. of Outputs Isolation(VDC) Package 3D Impression Drawing (.stp) Certification Datasheet Sample Buy
K78xxW-500R3 - 4.75~36 3.3~15 1 - Chassis K78xxW-500R3.stp - CE - K78xxW-500R3 - sample request - buy on line -
K7803W-500R3 - 4.75~36 3.3 1 - Chassis K78xxW-500R3.stp CE K7803W-500R3 申请 buy on line
K7805W-500R3 - 6.5~36 5 1 - Chassis K78xxW-500R3.stp CE K7805W-500R3 申请 buy on line
K7809W-500R3 - 12~36 9 1 - Chassis K78xxW-500R3.stp CE K7809W-500R3 申请 buy on line
K7812W-500R3 - 8~36 12 1 - Chassis K78xxW-500R3.stp CE K7812W-500R3 申请 buy on line
K7815W-500R3 - 8~36 15 1 - Chassis K78xxW-500R3.stp CE K7815W-500R3 申请 buy on line
KUB48_QB-10A - 16~75 12,24 1 - DIP - CE - KUB48_QB-10A - sample request - buy on line -
KUB4812QB-10A - 16~75 12 1 - DIP - CE KUB4812QB-10A 申请 buy on line
KUB4824QB-10A - 30~75 24 1 - DIP - CE KUB4824QB-10A 申请 buy on line
K78_MT-500R4 - 8~36 3.3~15 1 - DFN - - K78_MT-500R4 - sample request - buy on line -
K7803MT-500R4 - 4.5~36 3.3 1 - DFN - - K7803MT-500R4 申请 buy on line
K7805MT-500R4 - 6.5~36 5 1 - DFN - - K7805MT-500R4 申请 buy on line
K78X6MT-500R4 - 7~36 6.5 1 - DFN - - K78X6MT-500R4 申请 buy on line
K7809MT-500R4 - 8~36 9 1 - DFN - - K7809MT-500R4 申请 buy on line
K7812MT-500R4 - 8~36 12 1 - DFN - - K7812MT-500R4 申请 buy on line
K7815MT-500R4 - 8~36 15 1 - DFN - - K7815MT-500R4 申请 buy on line
K78_T-500R3 - 4.75~36 1.5~6.5 1 - SMD K78_T-500R3.stp - - K78_T-500R3 - sample request - buy on line -
K7801T-500R3 - 4.75~28 1.5 1 - SMD K78_T-500R3.stp - K7801T-500R3 申请 buy on line
K78X2T-500R3 - 4.75~28 1.8 1 - SMD K78_T-500R3.stp - K78X2T-500R3 申请 buy on line
K7802T-500R3 - 4.75~32 2.5 1 - SMD K78_T-500R3.stp - K7802T-500R3 申请 buy on line
K7803T-500R3 - 4.75~36 3.3 1 - SMD K78_T-500R3.stp - K7803T-500R3 申请 buy on line
K7805T-500R3 - 6.5~36 5 1 - SMD K78_T-500R3.stp - K7805T-500R3 申请 buy on line
K78X6T-500R3 - 8~36 6.5 1 - SMD K78_T-500R3.stp - K78X6T-500R3 申请 buy on line
K7809T-500R3 - 12~36 9 1 - SMD K78_T-500R3.stp - K7809T-500R3 申请 buy on line
K7812T-500R3 - 15~36 12 1 - SMD K78_T-500R3.stp - K7812T-500R3 申请 buy on line
K7815T-500R3 - 19~36 15 1 - SMD K78_T-500R3.stp - K7815T-500R3 申请 buy on line
K78_JT-500R3 - 4.75~36 3.3~15 1 - SMD(without housing) K78_JT-500R3.stp - CE - K78_JT-500R3 - sample request - buy on line -
K7803JT-500R3 - 4.75~36 3.3 1 - SMD(without housing) K78_JT-500R3.stp CE K7803JT-500R3 申请 buy on line
K7805JT-500R3 - 6.5~36 5 1 - SMD(without housing) K78_JT-500R3.stp CE K7805JT-500R3 申请 buy on line
K7809JT-500R3 - 12~36 9 1 - SMD(without housing) K78_JT-500R3.stp CE K7809JT-500R3 申请 buy on line
K7812JT-500R3 - 15~36 12 1 - SMD(without housing) K78_JT-500R3.stp CE K7812JT-500R3 申请 buy on line
K7815JT-500R3 - 19~36 15 1 - SMD(without housing) K78_JT-500R3.stp CE K7815JT-500R3 申请 buy on line
K78Lxx-500R3 - 4.75~36 3.3~15 1 - SIP(without housing) K78Lxx-500R3.stp - CE UL CB - K78Lxx-500R3 - sample request - buy on line -
K78L03-500R3 - 4.75~36 3.3 1 - SIP(without housing) K78Lxx-500R3.stp CE UL CB K78L03-500R3 申请 buy on line
K78L05-500R3 - 6.5~36 5 1 - SIP(without housing) K78Lxx-500R3.stp CE UL CB K78L05-500R3 申请 buy on line
K78L12-500R3 - 15~36 12 1 - SIP(without housing) K78Lxx-500R3.stp CE UL CB K78L12-500R3 申请 buy on line
K78L15-500R3 - 19~36 15 1 - SIP(without housing) K78Lxx-500R3.stp CE UL CB K78L15-500R3 申请 buy on line
K78xx-500R3 - 4.75~36 3.3~15 1 - SIP K78xx-500R3.stp - CE UL CB - K78xx-500R3 - sample request - buy on line -
K7803-500R3 - 4.75~36 3.3 1 - SIP K78xx-500R3.stp CE UL CB K7803-500R3 申请 buy on line
K7809-500R3 - 12~36 9 1 - SIP K78xx-500R3.stp CE UL CB K7809-500R3 申请 buy on line
K7812-500R3 - 15~36 12 2 - SIP K78xx-500R3.stp CE UL CB K7812-500R3 申请 buy on line
K7815-500R3 - 19~36 15 2 - SIP K78xx-500R3.stp CE UL CB K7815-500R3 申请 buy on line
K7805-500R3 - 6.5~36 5 1 - SIP K78xx-500R3.stp CE UL CB K7805-500R3 申请 buy on line
K78(L)04-1000R3 - 8~36 4 1 - SIP - - K78(L)04-1000R3 - sample request - buy on line -
K7804-1000R3 - 8~36 4 1 - SIP - - K7804-1000R3 申请 buy on line
K78L04-1000R3 - 8~36 4 1 - SIP(without housing) - - K78L04-1000R3 申请 buy on line
K78xx-1000R3(L) - 6~36 3.6~15 1 - SIP K78xx-1000R3.stp - CE UL - K78xx-1000R3(L) - sample request - buy on line -
K7803-1000R3 - 6~36 3.3 1 - SIP K78xx-1000R3.stp CE UL K7803-1000R3 申请 buy on line
K7805-1000R3 - 8~36 5 1 - SIP K78xx-1000R3.stp CE UL K7805-1000R3 申请 buy on line
K7805-1000R3L - 8~36 5 1 - SIP K78xx-1000R3.stp CE UL K7805-1000R3L 申请 buy on line
K7809-1000R3 - 13~36 9 1 - SIP K78xx-1000R3.stp CE UL K7809-1000R3 申请 buy on line
K7809-1000R3L - 13~36 9 1 - SIP K78xx-1000R3.stp CE UL K7809-1000R3L 申请 buy on line
K7812-1000R3 - 16~36 12 1 - SIP K78xx-1000R3.stp CE UL K7812-1000R3 申请 buy on line
K7812-1000R3L - 16~36 12 1 - SIP K78xx-1000R3.stp CE UL K7812-1000R3L 申请 buy on line
K7815-1000R3 - 16~36 15 1 - SIP K78xx-1000R3.stp CE UL K7815-1000R3 申请 buy on line
K7815-1000R3L - 16~36 15 1 - SIP K78xx-1000R3.stp CE UL K7815-1000R3L 申请 buy on line
K7803-1000R3L - 6~36 3.3 1 - SIP K78xx-1000R3.stp CE UL K7803-1000R3L 申请 buy on line
K78_T-1000R3 - 4.75~36 1.5~6.5 1 - SMD K78_T-1000R3.stp - - K78_T-1000R3 - sample request - buy on line -
K7801T-1000R3 - 4.75~32 1.5 1 - SMD K78_T-1000R3.stp - K7801T-1000R3 申请 buy on line
K78X2T-1000R3 - 4.75~32 1.8 1 - SMD K78_T-1000R3.stp - K78X2T-1000R3 申请 buy on line
K7802T-1000R3 - 4.75~32 2.5 1 - SMD K78_T-1000R3.stp - K7802T-1000R3 申请 buy on line
K7803T-1000R3 - 6.5~36 3.3 1 - SMD K78_T-1000R3.stp - K7803T-1000R3 申请 buy on line
K7805T-1000R3 - 8~36 5 1 - SMD K78_T-1000R3.stp - K7805T-1000R3 申请 buy on line
K78X6T-1000R3 - 10~36 6.5 1 - SMD K78_T-1000R3.stp - K78X6T-1000R3 申请 buy on line
K7809T-1000R3 - 13~36 9 1 - SMD K78_T-1000R3.stp - K7809T-1000R3 申请 buy on line
K7812T-1000R3 - 16~36 12 1 - SMD K78_T-1000R3.stp - K7812T-1000R3 申请 buy on line
K78Lxx-1000R3 - 6~36 3.3~15 1 - SIP(without housing) K78Lxx-1000R3.stp - CE UL - K78Lxx-1000R3 - sample request - buy on line -
K78L03-1000R3 - 6~36 3.3 1 - SIP(without housing) K78Lxx-1000R3.stp CE UL K78L03-1000R3 申请 buy on line
K78L12-1000R3 - 16~36 12 1 - SIP(without housing) K78Lxx-1000R3.stp CE UL K78L12-1000R3 申请 buy on line
K78L05-1000R3 - 8~36 5 1 - SIP(without housing) K78Lxx-1000R3.stp CE UL K78L05-1000R3 申请 buy on line
K78L15-1000R3 - 20~36 15 1 - SIP(without housing) K78Lxx-1000R3.stp CE UL K78L15-1000R3 申请 buy on line
K78xxM-1000R3 - 6~36 3.3~15 1 - SIP K78xxM-1000R3.stp - CE - K78xxM-1000R3 - sample request - buy on line -
K7803M-1000R3 - 6~36 3.3 1 - SIP K78xxM-1000R3.stp CE K7803M-1000R3 申请 buy on line
K7805M-1000R3 - 8~36 5 2 - SIP K78xxM-1000R3.stp CE K7805M-1000R3 申请 buy on line
K7809M-1000R3 - 13~36 9 1 - SIP K78xxM-1000R3.stp CE K7809M-1000R3 申请 buy on line
K78X6M-1000R3 - 10~36 6.5 1 - SIP K78xxM-1000R3.stp CE K78X6M-1000R3 申请 buy on line
K7812M-1000R3 - 16~36 12 1 - SIP K78xxM-1000R3.stp CE K7812M-1000R3 申请 buy on line
K7815M-1000R3 - 20~36 15 2 - SIP K78xxM-1000R3.stp CE K7815M-1000R3 申请 buy on line
K78xx-2000R3 - 4.5~36 2.5~15 1 - SIP K78xxW-500R3.stp - CE - K78xx-2000R3 - sample request - buy on line -
K7802-2000R3 - 4.5~36 2.5 1 - SIP K78xxW-500R3.stp CE K7802-2000R3 申请 buy on line
K7803-2000R3 - 6~36 3.3 1 - SIP K78xxW-500R3.stp CE K7803-2000R3 申请 buy on line
K7805-2000R3 - 8~36 5 1 - SIP K78xxW-500R3.stp CE K7805-2000R3 申请 buy on line
K7809-2000R3 - 13~36 9 1 - SIP K78xxW-500R3.stp CE K7809-2000R3 申请 buy on line
K7812-2000R3 - 16~36 12 1 - SIP K78xxW-500R3.stp CE K7812-2000R3 申请 buy on line
K7815-2000R3 - 18~36 15 1 - SIP K78xxW-500R3.stp CE K7815-2000R3 申请 buy on line
K7803-2000R3L - 6~36 3.3 1 - SIP(Bent foot) K78xxW-500R3.stp CE K7803-2000R3L 申请 buy on line
K7805-2000R3L - 8~36 5 1 - SIP(Bent foot) K78xxW-500R3.stp CE K7805-2000R3L 申请 buy on line
K7812-2000R3L - 16~36 12 1 - SIP(Bent foot) K78xxW-500R3.stp CE K7812-2000R3L 申请 buy on line
K12T-6A - 8.3~14 0.75~5 1 - SMD K12T-6A.stp - CE - K12T-6A - sample request - buy on line -
K12T-6A-P - 8.3~14 0.75~5 1 - SMD - CE K12T-6A-P 申请 buy on line
K12T-6A-N - 8.3~14 0.75~5 1 - SMD - CE K12T-6A-N 申请 buy on line
K12T-10A - 8.3~14 0.75~5 1 - SMD K12T-10A.stp - CE - K12T-10A - sample request - buy on line -
K12T-10A-P - 8.3~14 0.75~5 1 - SMD K12T-10A.stp CE K12T-10A-P 申请 buy on line
K12T-10A-N - 8.3~14 0.75~5 1 - SMD K12T-10A.stp CE K12T-10A-N 申请 buy on line
K12T-16A - 8.3~14 0.75~5 1 - SMD K12T-16A.stp - CE - K12T-16A - sample request - buy on line -
K12T-16A-P - 8.3~14 0.75~5 1 - SMD K12T-16A.stp CE K12T-16A-P 申请 buy on line
K12T-16A-N - 8.3~14 0.75~5 1 - SMD K12T-16A.stp CE K12T-16A-N 申请 buy on line
MBP2403YMD-3A - 16~32 2.0~3.65 1 1000 DIP - CE - MBP2403YMD-3A - sample request - buy on line -
MBP2403YMD-3A - 16~32 2.0~3.65 1 1000 DIP - CE MBP2403YMD-3A 申请 buy on line
MBP4803YMD-3A - 30~60 2.0~3.65 1 1000 DIP - CE - MBP4803YMD-3A - sample request - buy on line -
MBP4803YMD-3A - 30~60 2.0~3.65 1 1000 DIP - CE MBP4803YMD-3A 申请 buy on line
K78(L)xx-3AR3 - 8~36 3.3~15 1 - SIP - CE - K78(L)xx-3AR3 - sample request - buy on line -
K78(L)03-3AR3 - 8~36 3.3 1 - SIP - CE K78(L)03-3AR3 申请 buy on line
K78(L)05-3AR3 - 8~36 5 1 - SIP - CE K78(L)05-3AR3 申请 buy on line
K78(L)X6-3AR3 - 10~36 6.5 1 - SIP - CE K78(L)X6-3AR3 申请 buy on line
K78(L)09-3AR3 - 13~36 9 1 - SIP - CE K78(L)09-3AR3 申请 buy on line
K78(L)12-3AR3 - 16~36 12 1 - SIP - CE K78(L)12-3AR3 申请 buy on line
K78(L)15-3AR3 - 19~36 15 1 - SIP - CE K78(L)15-3AR3 申请 buy on line
K78_MT-1000R4 - 4.75~36 3.3~15 2 - DFN - - K78_MT-1000R4 - sample request - buy on line -
K7803MT-1000R4 - 4.75~36 3.3 2 - DFN - - K7803MT-1000R4 申请 buy on line
K7805MT-1000R4 - 6.5~36 5 2 - DFN - - K7805MT-1000R4 申请 buy on line
K78X6MT-1000R4 - 8~36 6.5 2 - DFN - - K78X6MT-1000R4 申请 buy on line
K7809MT-1000R4 - 8~36 9 2 - DFN - - K7809MT-1000R4 申请 buy on line
K7812MT-1000R4 - 8~36 12 2 - DFN - - K7812MT-1000R4 申请 buy on line
K7815MT-1000R4 - 8~36 15 2 - DFN - - K7815MT-1000R4 申请 buy on line
B_S-W2R2 0.25 2.97~26.4 3.3~12 1 1500 SIP B_S-W2R2.stp - CE UL CB - B_S-W2R2 - sample request - buy on line -
B0303S-W2R2 0.25 2.97~3.63 3.3 1 1500 SIP B_S-W2R2.stp CE UL CB B0303S-W2R2 申请 buy on line
B0305S-W2R2 0.25 2.97~3.63 5 1 1500 SIP B_S-W2R2.stp CE UL CB B0305S-W2R2 申请 buy on line
B1205S-W2R2 0.25 10.8~13.2 5 1 1500 SIP B_S-W2R2.stp CE UL CB B1205S-W2R2 申请 buy on line
B1505S-W2R2 0.25 13.5~16.5 5 1 1500 SIP B_S-W2R2.stp CE UL CB B1505S-W2R2 申请 buy on line
B2405S-W2R2 0.25 21.6~26.4 5 1 1500 SIP B_S-W2R2.stp CE UL CB B2405S-W2R2 申请 buy on line
B2409S-W2R2 0.25 21.6~26.4 9 1 1500 SIP B_S-W2R2.stp CE UL CB B2409S-W2R2 申请 buy on line
F_XT-W2R2 0.25 4.5~13.2 5 1 3000 SMD F_XT-W2R2.stp - CE - F_XT-W2R2 - sample request - buy on line -
F1205XT-W2R2 0.25 10.8~13.2 5 1 3000 SMD F_XT-W2R2.stp CE F1205XT-W2R2 申请 buy on line
B_XT-W2R2 0.25 2.97~26.4 3.3~15 1 1500 SMD B_XT-W2R2.stp - CE - B_XT-W2R2 - sample request - buy on line -
B0303XT-W2R2 0.25 2.97~3.63 3.3 1 1500 SMD B_XT-W2R2.stp - B0303XT-W2R2 申请 buy on line
B0305XT-W2R2 0.25 2.97~3.63 5 1 1500 SMD B_XT-W2R2.stp - B0305XT-W2R2 申请 buy on line
B0312XT-W2R2 0.25 2.97~3.63 12 1 1500 SMD B_XT-W2R2.stp - B0312XT-W2R2 申请 buy on line
B1203XT-W2R2 0.25 10.8~13.2 3.3 1 1500 SMD B_XT-W2R2.stp - B1203XT-W2R2 申请 buy on line
B1205XT-W2R2 0.25 10.8~13.2 5 1 1500 SMD B_XT-W2R2.stp CE B1205XT-W2R2 申请 buy on line
B1209XT-W2R2 0.25 10.8~13.2 9 1 1500 SMD B_XT-W2R2.stp CE B1209XT-W2R2 申请 buy on line
B1212XT-W2R2 0.25 10.8~13.2 12 1 1500 SMD B_XT-W2R2.stp CE B1212XT-W2R2 申请 buy on line
B2405XT-W2R2 0.25 21.6~26.4 5 1 1500 SMD B_XT-W2R2.stp CE B2405XT-W2R2 申请 buy on line
HO1-P(N)xxxxV-xxC 0.625~2 10.8~13.2 0~±1250V 1 - DIP - - HO1-P(N)xxxxV-xxC - sample request - buy on line -
HO1-P202V-1C - 21.6~26.4 2000 1 - DIP - - HO1-P202V-1C 申请 buy on line
HO1-P1251V-0.5C 0.625 10.8~13.2 1250 1 - DIP - - HO1-P1251V-0.5C 申请 buy on line
HO1-N1251V-0.5C 0.625 10.8~13.2 -1250 1 - DIP - - HO1-N1251V-0.5C 申请 buy on line
HO1-P(N)xxxxV-xxF 0.625~2 21.6~26.4 0~±1250V 1 - DIP - - HO1-P(N)xxxxV-xxF - sample request - buy on line -
HO1-P1251V-0.5F 0.625 21.6~26.4 1250 1 - DIP - - HO1-P1251V-0.5F 申请 buy on line
HO1-N1251V-0.5F 0.625 21.6~26.4 -1250 1 - DIP - - HO1-N1251V-0.5F 申请 buy on line

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

Series
K78xxW-500R3
K7803W-500R3
K7805W-500R3
K7809W-500R3
K7812W-500R3
K7815W-500R3
KUB48_QB-10A
KUB4812QB-10A
KUB4824QB-10A
K78_MT-500R4
K7803MT-500R4
K7805MT-500R4
K78X6MT-500R4
K7809MT-500R4
K7812MT-500R4
K7815MT-500R4
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
MBP2403YMD-3A
MBP2403YMD-3A
MBP4803YMD-3A
MBP4803YMD-3A
K78(L)xx-3AR3
K78(L)03-3AR3
K78(L)05-3AR3
K78(L)X6-3AR3
K78(L)09-3AR3
K78(L)12-3AR3
K78(L)15-3AR3
K78_MT-1000R4
K7803MT-1000R4
K7805MT-1000R4
K78X6MT-1000R4
K7809MT-1000R4
K7812MT-1000R4
K7815MT-1000R4
B_S-W2R2
B0303S-W2R2
B0305S-W2R2
B1205S-W2R2
B1505S-W2R2
B2405S-W2R2
B2409S-W2R2
F_XT-W2R2
F1205XT-W2R2
B_XT-W2R2
B0303XT-W2R2
B0305XT-W2R2
B0312XT-W2R2
B1203XT-W2R2
B1205XT-W2R2
B1209XT-W2R2
B1212XT-W2R2
B2405XT-W2R2
HO1-P(N)xxxxV-xxC
HO1-P202V-1C
HO1-P1251V-0.5C
HO1-N1251V-0.5C
HO1-P(N)xxxxV-xxF
HO1-P1251V-0.5F
HO1-N1251V-0.5F

DC/DC Converter-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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