cdtechno NCX10S48033Y, NCX10S24050, NCX10S48050Y, NCX10S48050, NCX10S48033 Datasheet

NCX10S SERIES

Isolated 10W Single Output DC/DC Converters

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SELECTION GUIDE

1

FEATURES

■ High Efficiency to 82%

■ 500V Input to Output Isolation

■ Industry Standard Pinout

■ UL 60950 Recognition Pending

■ Non Latching Current Limit

■ Constant 400kHz Frequency

■ Versatile Control Options

■ Continuous Rating to 10W @85°C

■ Operation to Zero Load

■ Protected Against Load Faults

■ Internal Over Temperature Protection

■ Uses No Electrolytic Capacitors

DESCRIPTION

The NCX10S series of DC/DC Converters
combines ease of application with versatility
and is available in two pin patterns based on
popular industry standards. High efficiency
enables full rating to be achieved in a small
package without heatsinking, and a high
surge capability will provide for start-up and
transient loads, whilst being thermally
protected against sustained overload. The
NCX10S series is currently undergoing
testing by Underwriters Laboratory (UL) to UL
60950 for functional insulation.

Order Code V V A mW mW % pF

NCX10S24033

24 3.4 3.1 270 26 78 23

NCX10S24050

24 5.1 2.0 280 25 82 26

NCX10S48033

48 3.4 3.1 500 44 79 29

NCX10S48050

48 5.1 2.0 510 45 82 32

NCX10S24033Y

24 3.4 3.1 270 26 78 23

NCX10S24050Y

24 5.1 2.0 280 25 82 26

NCX10S48033Y

48 3.4 3.1 500 44 79 29

NCX10S48050Y

48 5.1 2.0 510 45 82 32

Parameter Conditions MIN NOM MAX Units

Voltage Range

Continuous operation, 24V input types 18 24 36

V

Continuous operation, 48V input types 36 48 75

Nominal

Input Voltage

Output Voltage

Output Current

Power Consumption

at 0% Load

Power Consumption

at Shutdown

Efficiency (MIN)

Isolation

Capacitance

Parameter Conditions MIN TYP MAX Units

Voltage Set Point Error 50% load 1.0 %
Overall

Substrate temperature –40 to 110°C

Voltage Error

Load 0% - 100% 2.5 %
Input specified range

Temperature Coefficient
of Output Voltage 250 ppm°C
(slope)

Deviation of
Output Voltage

Temperature MIN - MAX

1.0 %

Current Limit Continuous short circuit causes no damage

NCX10S24033 153

% of

Overload 95% of nominal

NCX10S24050 170

rated

Output Current output voltage

NCX10S48033 148

Output

NCX10S48050 164

Current

Line Regulation Operating voltage range, 50% load 0.1 %
Load Regulation 0% - 100% rated load

2

0.5 %

Ripple rms 1.0 %

Input voltage, 24V input types –0.3V to 40V
Input voltage, 48V input types –0.3V to 80V
Output Voltage –0.3V to regulated voltage
Output trim control –1V to +30V relative to output return
Shutdown control –0.3V to 6V relative to input return

INPUT CHARACTERISTICS

1

OUTPUT CHARACTERISTICS

1

Parameter Conditions MIN TYP MAX Units

Voltage Trimming At rated load,

±10 %

Range Trim control at either output
Remote Switch Input Not operating -0.3 0 1.5
(voltage relative Operating, open circuit voltage

2.6 5.0 6.1

V

to input negative) VINMIN to MAX
Start Delay

Time from application of valid input
voltage to output being in specification

10 ms

Switching Frequency 360 400 440 kHz

CONTROL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

1 Specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
2A minimum load of 10% of rating is recommended for typical applications, see application notes.

ENVIRONMENTAL CHARACTERISTICS

APPLICATION NOTES

Parameter Conditions MIN TYP MAX Units

Substrate Temp. Full load –40 125 °C
Storage Absolute MAX internal temperature –40 125 °C
Thermal Protection Operates at substrate temperature 150 °C

In a typical application, the NCX10S series
of DC/DC converters require nothing more
than a dc supply of correct polarity and
voltage to generate its specified output. These
notes are intended to offer help in the use of
other facilities offered by these converters,
and to provide assistance in achieving their
full potential.

VOLTAGE TRIMMING

ISOLATION CHARACTERISTICS

Parameter Conditions MIN TYP MAX Units

Isolation Voltage Flash tested for 1 second 1000 VDC
Resistance V

ISO

=500VDC 1 GΩ

THERMAL PERFORMANCE

11
10

9
8
7
6
5
4

-40 10 60 110
Ambient Temperature (°C)

NCX10S24033

Ambient Power (W)

Still Air
100lfm
200lfm
300lfm
400lfm

11
10

9
8
7
6
5
4

-40 10 60 110
Ambient Temperature (°C)

NCX10S24050

Ambient Power (W)

Still Air
100lfm
200lfm
300lfm

11
10

9
8
7
6
5
4

-40 10 60 110
Ambient Temperature (°C)

NCX10S48033

Ambient Power (W)

Still Air
100lfm
200lfm

11
10

9
8
7
6
5
4

-40 10 60 110
Ambient Temperature (°C)

NCX10S48050

Ambient Power (W)

Still Air
100lfm

UL 60950 RECOGNITION

(Maximum permissable load in still air)

Part Number -40°C 25°C 70°C 75°C 80°C 85°C 90°C Units

NCX10S24033 10.0 10.0 10.0 9.0 7.9 6.5 5.0
NCX10S24050 10.0 10.0 10.0 10.0 8.9 7.2 5.2

W

NCX10S48033 10.0 10.0 10.0 9.5 8.4 7.1 5.5
NCX10S48050 10.0 10.0 10.0 10.0 10.0 9.6 8.0

NCX10S SERIES

Isolated 10W Single Output DC/DC Converters

DC

DC

+V

IN

–V

IN

+V

OUT

ADJ

100KΩ

0V

Figure 1: Voltage Trimming

The trimming (adjust) input on the secondary
side allows output voltage adjustment within
the capability of the power circuit.

When open circuit, the trimming pin ADJ
operates at near half the output voltage. A
basic trimming arrangement consists of a
potentiometer of 10kΩ to 100kΩ connected
across the output, with its wiper connected to
the ADJ pin (see figure 1). Dependent on
model, the output will be reduced by about

15% when the wiper is at the positive output,
or increased by about 24% when at the
negative rail. Regulation will be maintained to
at least 10% adjustment either way.

If finer adjustment is required, a resistor may
be included between the wiper and the pin.
For example, 62kΩ will restrict a 3.3V model
to ±5% adjustment range. The corresponding
values for the 5V model is 56kΩ.