NCS3 Series
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Isolated 3W 4:1 Input Single Output DC-DC Converters
SELECTION GUIDE
Efciency
Rated Input Rated
Efciency Ripple and
1
12V or 48V MTTF
Current Input
24V Input. Noise
12V or 48V Current Input.
Order Code
Input. 24V Input.
Nom. Min. Typ. Min. Typ. Typ. Max.
V V % mA mA mA % % % % mVp/p mVp/p kHrs
NCS3S1203SC 12 3.3 10 250 125 700 74 77 73 76 32 55 1335
NCS3S1205SC 12 5 5 305 150 600 79 82 79 81 34 60 1081
NCS3S1212SC 12 12 0 300 150 250 81 84 80 83 28 55 1272
NCS3S1215SC 12 15 0 300 150 200 82 86 81 85 20 50 1617
NCS3S4803SC 48 3.3 10 124 65 700 70 74 74 77 22 55 1327
NCS3S4805SC 48 5 5 153 80 600 77.5 80 79 81 36 75 1117
FEATURES
NCS3S4812SC 48 12 0 150 80 250 77 81 80 83 31 65 1211
UL 60950 recognised NCS3S4815SC 48 15 0 149 80 200 78 81 81 83 22 55 1574
4:1 Wide range voltage input
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Operating temperature range -40C to 85C
12V input types 9 12 36
with derating
Voltage range V
48V input types 18 48 75
1.5 kVDC Isolation Hi Pot Test
12V input 5.5
NCS3S12XX
24V input 2
3.3V, 5V, 12V & 15V outputs
Input reected ripple
mA p-p
current
24V input 3.5
No electrolytic capacitors
NCS3S48XX
48V input 2
Continuous short circuit protection
Power consumption at shutdown 2 mW
Input current in shutdown 2.5 mA
PRODUCT OVERVIEW
The NCS3 series of DC-DC converters offers a OUTPUT CHARACTERISTICS
single output voltage from input voltage ranges Parameter Conditions Min. Typ. Max. Units
of 9-36V and 18-75V. The NCS3 is housed in an 3.3V output types 2.31
Rated power W
industry standard package with a standard pinout.
All other output types 3
Voltage set point accuracy All output types 1 2 %
Applications include telecommunications, battery
Line regulation Low line to high line 0.5 %
powered systems, process control and distributed
Load regulation All output types 1 %
power systems.
Peak deviation (12.5-37.5% & 37.5-12.5% swing) 5 %Vout
Transient response Settling time
1.5 ms
(within 5% V Nom.)
out
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
CTRL input current Please refer to control pin application note 2 8 mA
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 minute 1500 VDC
NCS3S12XXSC 180
Isolation Capacitance pF
NCS3S48XXSC 185
Resistance Viso = 1kVDC 1 G
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Operation See derating graphs -40 85
Storage -50 115
C
Case temperature rise above
100% Load, Nom VIN, Still Air 30 40
ambient
1 Calculated using MIL-HDBK-217 FN2, parts stress method with nominal input voltage at full load.
All specications typical at TA=25C, nominal input voltage and rated output current unless otherwise specied.
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KDC_NCS3_B05 Page 1 of 10
Input
Voltage
Output
Voltage
Minimum
Load
Output
CurrentNCS3 Series
Isolated 3W 4:1 Input Single Output DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection (for SELV input voltages) Continuous
Control pin input current 8mA
Lead temperature 1.0mm from case for 10 seconds (to JEDEC JESD22-B106 ISS C) 260C
Input voltage, NCS3 12V input types 40V
Input voltage, NCS3 24V input types 80V
SWITCHING FREQUENCY
Parameter Conditions Min. Typ. Max. Units
10% Load 1200
12V input types
100% Load 280
NCS3S1203SC kHz
10% Load 1620
24V input types
100% Load 460
10% Load 1200
12V input types
100% Load 270
NCS3S1205SC kHz
10% Load 1690
24V input types
100% Load 490
10% Load 1220
12V input types
100% Load 310
NCS3S1212SC kHz
10% Load 1680
24V input types
100% Load 570
10% Load 1130
12V input types
100% Load 310
NCS3S1215SC kHz
10% Load 1580
24V input types
100% Load 570
10% Load 1020
24V input types
100% Load 270
NCS3S4803SC kHz
10% Load 1440
48V input types
100% Load 450
10% Load 1190
24V input types
100% Load 260
NCS3S4805SC kHz
10% Load 1590
48V input types
100% Load 470
10% Load 1180
24V input types
100% Load 1570
NCS3S4812SC kHz
10% Load 310
48V input types
100% Load 560
10% Load 1180
24V input types
100% Load 330
NCS3S4815SC kHz
10% Load 1590
48V input types
100% Load 610
APPLICATION NOTES
Recommended Input Capacitor and Maximum Output Capacitance
A 10 F output capacitor is recommended for stability under all operating conditions. Maximum output capacitance should not exceed:
Output Voltage MaximumLoad Capacitance
VF
3.3 470
5 470
12 220
15 110
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KDC_NCS3_B05 Page 2 of 10