NPH15S SERIES

Isolated 15W Single Output DC-DC Converters

SELECTION GUIDE

FEATURES

■

High Efficiency to 89%

■

■

1.5kV Input to Output Isolation

■

Industry Standard Pinout

■

UL 1950 Recognised

■

Non Latching Current Limit

■

Constant 350kHz Frequency

■

Versatile Control Options

■

Continuous Rating to 30W

at 40°C Without Heatsink

■

Operation to Zero Load

■

Protected Against Load Faults

■

Internal Over Temperature Protection

■

Uses No Electrolytic Capacitors

■

UL 94V-0 Package Materials

DESCRIPTION

The NPH15S series of DC-DC Converters

combines ease of application with versatility.

The pin pattern is based on the popular

industry standard, but two additional pins

may optionally be fitted to provide a variety

of features not commonly found on units of

this type. 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. Overload protection of the

“constant current” type ensures start-up

into complex load conditions. The copper

case achieves efficient heat transfer and

screening. The product range has been

recognised by Underwriters Laboratory (UL)

to UL 1950 for operational insulation, file

number E179522 applies.

Nominal

Output

Output

Current

Input Voltage

Voltage

Current

Limit

Efficiency

(V)

(V)

(mA)

(A)Min

(A)Max

(%)

NPH15S2403i

24

3.4

4.4

7.5

11.0

81

NPH15S2405i

24

5.1

3.0

5.0

7.5

84

NPH15S2412i

24

12.1

1.3

2.5

3.7

86

NPH15S2415i

24

15.1

1.0

2.0

3.0

87

NPH15S4803i

48

3.4

4.4

7.5

11.0

83

NPH15S4805i

48

5.1

3.0

5.0

7.5

85

NPH15S4812i

48

12.1

1.3

2.5

3.7

88

NPH15S4815i

48

15.1

1.0

2.0

3.0

89

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

Parameter

Conditions

MIN

TYP

MAX

Units

Voltage Set

50% load

0.5

%

Point Error

Overall

Case temperature –40°C 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

0.5

1

%

Line Regulation

Operating voltage range, 50% load

0.1

%

Load Regulation

0.5

%

Ripple

rms

70

mV

Input voltage, 24V input types

Input voltage, 48V input types

Output Voltage

–0.3V to regulated voltage

Output trim control

–1V to +30V

Synchronisation/shutdown control

±15V relative to input return

INPUT CHARACTERISTICS

OUTPUT CHARACTERISTICS

Parameter

Conditions

MIN

TYP

MAX

Units

Voltage Trimming

At rated load,

±10

%

Range

Trim control at either output

Not operating

-15

0

1.5

V

(voltage relative

to input negative)

Operating, open circuit voltage

9

10

11

Start Delay

Time from application of valid input

voltage to output being in specification

25

50

mS

Specified drive signal

320

440

kHz

Switching Frequency

330

350

395

kHz

CONTROL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

ISOLATION CHARACTERISTICS

Parameter

Conditions

MIN

TYP

MAX

Units

Isolation Voltage

Flash tested for 1 second

1500

VDC

Resistance

Viso=500VDC

1

4000

GΩ

1 If optional pins ADJ and SS are required (as indicated in the pin connections diagram) prefix the ending “i” with

an E when ordering, e.g. NPH15S4803Ei.

2A minimum load of 10% of rating is recommended for typical applications.

3 Optional where fitted.

4 Absolute maximum value for 30 seconds. Prolonged operation may damage the product.

All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.

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