Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com

©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06

POWER PRODUCTS

PISCES II DC/DC CONVERTERS

G2PW5V030

48V Input – 5.0VDC – 30A Output

page 5

Protection and Control

Thermal Shutdown

The printed circuit board temperature is measured using a

semiconductor sensor. If the maximum rated temperature

is exceeded, the converter is latched off. To re-enable the

converter requires cycling the ON/OFF pin or power to the

converter. If non-latching is required, consult factory.

Control Options

As the behavior of the circuit is determined by firmware in the

microcontroller, specific requirements, such as:

• non-latching thermal protection

• custom valid input voltage range

• controlled delay from initiating an ON/OFF signal for

power sequencing

can be accomplished with no change to hardware. The

standard behavior was chosen based on system design

experience, but customers may have their own requirements.

Please contact Bel Power for any special needs.

Remote Sense

The output voltage is regulated at the point where the

sense pins connect to the power output pins. Total sense

compensation should not exceed 0.4V or 10% of Vout,

whichever is greater.

Safety

An external input fuse must always be used to meet these

safety requirements.

External Output Trimming

Trim

To trim the output voltage higher, connect the required trim

resistor from the Trim pin to the +Sense pin. To trim the output

voltage lower, connect the required trim resistor from the Trim

pin to the –Sense pin.

Trim-down

+ Sense

Trim

– Sense

Increase in Output Voltage (%)

10000

1000

100

0

1

2

3

4

5

6

7

8

9

10

5.0V Trim-up

Decrease in Output Voltage (%)

1000

100

10

0

1

2

3

4

5

6

7

8

9

10

Trim-down

R

TRIM-UP

=

5.0(100+

∆%) _ (100+2∆%)

5.11k

Ω

1.225

∆%

∆%

{

}

R

TRIM-DOWN

=

100 _ 2

5.11k

Ω

∆%

{

}

Trim-up