
OUTPUT SPECIFICATIONS 
Output power     5 Watts max 
Voltage accuracy      Full load and nominal Vin  ± 2% 
Minimum load (Note 1) 
10% of FL
Line regulation    LL to HL at Full Load 
± 0.2%
Load regulation    25% to 100% FL 
Single 
Dual 
± 0.5%
± 1%
Cross regulation(Dual) Asymmetrical load 25% / 100% FL  ± 5% 
Ripple and noise    20MHz bandwidth  50mVp-p 
T e mperature coefficient 
I0.02% / ºC, max
Transient response recovery time 25% load step change  200uS 
Over load protection  % of FL at nominal input  170% typ 
Short circuit protection  Continuous, automatics recovery
INPUT SPECIFICATIONS 
Input voltage range 
FKC05 
FKC05-W 
12V nominal input 
24V nominal input 
48V nominal input 
24V nominal input 
48V nominal input 
9 – 18VDC 
18 – 36VDC 
36 – 75VDC
9 – 36VDC 
18 – 75VDC
Input filter   Pi type 
Input surge voltage  
100mS max
12V input 
24V input 
48V input 
36VDC 
50VDC
100VDC
Input reflected ripple (Note 2)  Nominal Vin and full load  20mAp-p 
Start up time  Nominal Vin and constant resistor load  600mS typ
GENERAL SPECIFICATIONS 
Efficiency  See table
Isolation voltage 
Input to Output 
Input ( Output ) to Case
1600VDC, min 
DIP    1600VDC, min 
SMD    1000VDC, min
Isolation resistance 
109ohms, min
Isolation capacitance  300pF, ma
Switching frequency  300KHz, typ 
Approvals and standard   IEC60950, UL1950, EN60950 
Case material  Nickel-coated coppe
Base material  Non-conductive black plastic 
Potting material  Epoxy (UL94-V0)
Dimensions 
1.25 X 0.80 X 0.40 Inch 
(31.8 X 20.3 X 10.2 mm)
Weight 
DIP 
SMD 
16g (0.55oz) 
18g (0.62oz)
MTBF (Note 3)  3.165 x 106 hrs
ENVIRO NMENTAL SPECIFIC ATIONS 
Operating temperature range  
Standard 
M1 (Note 4) 
M2 (W series) 
-25ºC~+85ºC (with derating)
-40ºC~+85ºC (non-derating)
-40ºC~+85ºC (with derating)
Maximum case temperature  +100ºC 
Storage temperature range  -55ºC ~ +105ºC 
Thermal impedance  Nature convection  20ºC/watt 
Thermal shock  MIL-STD-810D 
Vibration  10~55Hz, 2G, 30minitues along X,Y and Z 
Relative humidity  5% to 95% RH
EMC CHARACT ERIST ICS 
Conducted emissions  EN55022   Level A 
Radiated emissions  EN55022  Level A 
ESD EN61000-4-2 Perf. Criteria
Radiated immunity  EN61000-4-3  Perf. Criteria
Fast transient  EN61000-4-4  Perf. Criteria
Surge EN61000-4-5 Perf. Criteria
Conducted immunity  EN61000-4-6  Perf. Criteria
The FKC05 series offer 5 watts of output power from a package in an IC compatible 
24pin DIP configuration without derating to 71ºC ambient temperature and pin to pin 
compatible with FKC03 series. FKC05 series have 2:1 wide input voltage of 9-18, 18-36 
and 36-75VDC. FKC05-W series have 4:1 ultra wide input voltage of 9-36 and 
18-75VDC. The FKC05 features 1600VDC of isolation, short-circuit protection and as 
well as five sided shielding. All models are particularly suited to telecommunications, 
industrial, mobile telecom and test equipment applications. 
TECHNICAL SPECIFICATION All specifications are typical at nominal input, full load and 25ºC otherwise noted 
50 60 70 80 90 
100 -40 -25 0 -10 
25 
50 
75 
100 
0 
AMBIENT TEM PERA TURE (ºC) 
OUTPUT POWER (%) 
FKC05-48S05 Derating Curve 
Nature convection 
M! Version 
M1 Version
UL E193009 
TUV R3-50007936 
CB JPTUV-003641 
CE MARK 
• 5 WATTS OUTPUT POWER 
• 2:1 AND 4:1 WIDE INPUT VOLTAGE RANGE 
• INTERNATIONAL SAFETY STANDARD APPROVAL 
• FIVE-SIDED SHIELD 
• HIGH EFFICIENCY UP TO 84% 
• STAN DARD 24 PIN DIP PACKAGE & SMD TYPE PACKAGE 
• FIXED SWITCHING FREQUENCY 
 

Model 
Number 
Input 
Range 
Output 
Voltage 
Output 
Current 
Input 
Current 
(5)
Eff 
Load max 
FKC05-12S33  9 – 18 VDC  3.3 VDC  1000mA 
382mA 
76  2200uF 
FKC05-12S05  9 – 18 VDC  5 VDC  1000mA 
563mA 
78 1000uF 
FKC05-12S12  9 – 18 VDC  12 VDC  470mA  603mA  82  220uF 
FKC05-12S15  9 – 18 VDC  15 VDC  400mA  649mA  81  150uF 
FKC05-12D05  9 – 18 VDC  ± 5 VDC  ± 500mA  563mA  78  ± 680uF 
FKC05-12D12  9 – 18 VDC  ± 12 VDC  ± 230mA  597mA  81  ± 100uF 
FKC05-12D15  9 – 18 VDC  ± 15 VDC  ± 190mA  617mA  81  ± 68uF 
FKC05-24S33 (W)  18 – 36 (9 – 36) VDC  3.3 VDC  1000mA  194mA (191mA)  75 (76)  2200uF 
FKC05-24S05 (W)  18 – 36 (9 – 36) VDC  5 VDC  1000mA  285mA (285mA)  77 (77)  1000uF 
FKC05-24S12 (W)  18 – 36 (9 – 36) VDC  12 VDC  470mA  305mA (309mA)  81 (80)  220uF 
FKC05-24S15 (W)  18 – 36 (9 – 36) VDC  15 VDC  400mA  325mA (329mA)  81 (80)  150uF 
FKC05-24D05 (W)  18 – 36 (9 – 36) VDC  ± 5 VDC  ± 500mA  274mA (282mA)  80 (78)  ± 680uF 
FKC05-24D12 (W)  18 – 36 (9 – 36) VDC  ± 12 VDC  ± 230mA  288mA (295mA)  84 (82)  ± 100uF 
FKC05-24D15 (W)  18 – 36 (9 – 36) VDC  ± 15 VDC  ± 190mA  308mA (313mA)  81 (80)  ± 68uF 
FKC05-48S33 (W)  36 – 75 (18 – 75) VDC  3.3 VDC  1000mA  98mA (100mA)  74 (73)  2200uF 
FKC05-48S05 (W)  36 – 75 (18 – 75) VDC  5 VDC  1000mA   143mA (145mA)  77 (76)  1000uF 
FKC05-48S12 (W)  36 – 75 (18 – 75) VDC  12 VDC  470mA  151mA (155mA)  82 (80)  220uF 
FKC05-48S15 (W)  36 – 75 (18 – 75) VDC  15 VDC  400mA  162mA (167mA)  81 (79)  150uF 
FKC05-48D05 (W)  36 – 75 (18 – 75) VDC  ± 5 VDC  ± 500mA  141mA (145mA)  78 (76)  ± 680uF 
FKC05-48D12 (W)  36 – 75 (18 – 75) VDC  ± 12 VDC  ± 230mA  147mA (151mA)  82 (80)  ± 100uF 
FKC05-48D15 (W)  36 – 75 (18 – 75) VDC  ± 15 VDC  ± 190mA  154mA (159mA)  81 (79)  ± 68uF 
Note 
1. The FKC05 (W) series required a minimum 10% loading on the output to maintain specified regulation. Operation under no-load condition will not damage 
these devices, however they may not meet all listed specification. 
2. Simulated source impedance of 12uH. 12uH inductor on series with + Vin. 
3. BELLCORE TR-NWT-000332. Case I: 50% Stress, Temperature at 40ºC. (Ground fixed and controlled environment) 
4. M1 version is more efficient, therefore, it can be operated in a more extensive temperature range than standard and M2 version 
5. Maximum value at nominal input voltage and full load of standard type. 
6. Typical value at nominal input voltage and full load 
7. Test by minimum Vin and constant resistor load. 
8. There is no pin at PIN10 & PIN15 for FKC05-W series 
DIP PIN CONNECTI ON 
PIN  SINGLE  DUAL 
2  - INPUT  - INPUT 
3  - INPUT  - INPUT 
9  NC 
COMMON 
23  + INPUT + INPUT 
22  + INPUT + INPUT 
16  - OUTPUT COMMON 
10 NC(Note 8) NC(Note 8) 15 NC(Note 8) NC(Note 8)
PIN  SINGLE  DUAL 
11  NC  - OUT P U T  14 + OUTPUT + OUTPUT
SMD PIN CONNECTI ON 
PIN  SINGLE  DUAL 
2  - INPUT  - INPUT 
3  - INPUT  - INPUT 
9  NC 
COMMON 
23  + INPUT + INPUT 
22  + INPUT + INPUT 
16  - OUTPUT COMMON 
10  NC  NC  15  NC  NC 
PIN  SINGLE  DUAL 
11  NC  - OUTPUT  14 + OUTPUT + OUTPUT
Others  NC  NC  Others  NC  NC 
1. All dimensions in Inches (mm) 
2. Pin pitch tolerance I0.014(0.35)
Pin size is 0.02( 0.5) Dia or 
0.01 x 0.02 (0.25 x 0.50) Rectan gular Pin 
14 
23 
22 
16 
3 
9 
2 
11 
1.25 (31.8) 
0.60(15.2) 
0.80(20.3) 
0.40 
(10.2) 
0.15 
(3.8) 
0.70 (17.8) 
0.20 (5.1) 
0.18(4.6) 
BOT TOM 
VIEW 
15 
10 
Suffix-SMD 
1.00(25.4) 
0.92(23.4) 
0.44(11.2) 
0.43(10.9) 
0.10 (2.54) 
0.15 (3.81) 0.25 (6.35) 
1.25 (31.8) 
0.80(20.3) 
0.02(0.5) 
24 
13 
16 
20 
12
1
5
9
BOTTOM 
VIEW
Pin Area
0.04 x 0.02 
(1.0 x 0.5)