Laptop Power Adaptors (48W)

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GENERAL: These small but powerful converters provide a source of stabilised low voltage suitable for running many different items of equipment. Their output is ohmically isolated from and constant current limited. Continuous operation in current limit is allowed making them suitable for battery charging providing charge time is controlled. Connection to the battery is by a plug with a flying lead, that fits most standard cigar lighter sockets, and output is by flying lead terminated in a popular 2.5mm concentric plug.

The converters are mainly designed for use with notebook computers that have two wire input. These converters are current limited above a certain level of demand. The output isolation of the converter from system chassis ensures that earth currents do not flow.

BATTERY DRAIN: These converters draw about 1A at 12V, 0.5A at 24V I/P and 0.25A at 48V I/P for every 10 watts of load applied.

Models available:

SM4450 12V i/p, 5V at 8.5A o/p. SM4470 24V i/p, 5V at 8.5A o/p. SM3770 48V i/p, 5V at 8.5A o/p.
SM4451 12V i/p, 9V at 5.0A o/p. SM4471 24V i/p, 9V at 5.0A o/p. SM3771 48V i/p, 9V at 5.0A o/p.
SM4452 12V i/p, 12V at 3.8A o/p. SM4472 24V i/p, 12V at 3.8A o/p. SM3772 48V i/p, 12V at 3.8A o/p.
SM4453 12V i/p, 15V at 3.0A o/p. SM4473 24V i/p, 15V at 3.0A o/p. SM3773 48V i/p, 15V at 3.0A o/p.
SM4454 12V i/p, 18V at 2.5A o/p. SM4474 24V i/p, 18V at 2.5A o/p. SM3774 48V i/p, 18V at 2.5A o/p.
SM4455 12V i/p, 21V at 2.2A o/p. SM4475 24V i/p, 21V at 2.2A o/p. SM3775 48V i/p, 21V at 2.2A o/p.
SM4456 12V i/p, 24V at 1.9A o/p. SM4476 24V i/p, 24V at 1.9A o/p. SM3776 48V i/p, 24V at 1.9A o/p.
SM4457 12V i/p, 48V at 1.0A o/p. SM4477 24V i/p, 48V at 1.0A o/p. SM3777 48V i/p, 48V at 1.0A o/p.
SM4458 12V i/p, 13.8V at 3.3A o/p. SM4478 24V i/p, 13.8V at 3.3A o/p. SM3778 48V i/p, 13.8V at 3.3A o/p.
SM4459 12V i/p, 27.6V at 1.7A o/p. SM4479 24V i/p, 27.6V at 1.7A o/p. SM3779 48V i/p, 27.6V at 1.7A o/p.

Specification:

 

INPUT SPECIFICATION

 

12V TYPES

24V TYPES

48V TYPES

Battery:

12V Nominal battery.

24V Nominal battery.

 48V Nominal battery.

Voltage Range:

11-15V (10.5-16V Short term).

22-30V (21-32V Short term).

 44-60V (42-63V Short term).

Current, No Load:

0.1A Typical.

0.1A typical.

 0.05A typical.

Current Drawn Per 10W Load

1A.

0.5A.

 0.25A.

Input Fuse Rating:

6.3A 5 x 20MM (T).

6.3A 5 x 20MM (T).

 6.3A 5 x 20MM (T).

Input to output isolation:

500Kohm +/- 63V

 

 

OUTPUT SPECIFICATION

Output variation for 0-90% load change (plus drop in cable)

0.5% max.

Output variation for 2V input change:

50mV max.

Output current limit(See note 2):

125% +/- 17%.

Output low frequency ripple:

200mV max.

 

 

 

GENERAL

Size:

111mm x 60mm x 30mm.

Weight:

0.38 Kg.

Storage Temperature:

-40 to +70C.

Operating Temperature:

-20 to +35C.

 

SPECIFICATION NOTES:    The main variation of output voltage with load is due to the resistance of the output cable. An internal potentiometer is available to adjust the output voltage over a range of plus or minus 5% to compensate.

CAUTION: This converter is supplied on the basis of the user determining the suitability for the purpose for which it is to be used. Allow adequate ventilation to assist unit cooling. Removal of the input cigar plug will void warranty.

WARNING: Do not reverse input polarity. Do not expose to moisture. These converters are only suitable for use with vehicles having the negative of the battery connected to chassis. Not for life dependent use.