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HLS30ZD-NT

48 VDC Input, 30 & 40 Amp Half-Bricks

Power-One Inc. 

HLS Series DC-DC Converter Data Sheet

48 VDC Input, 30 & 40 Amp Half-Bricks

Safety Considerations

The HLS Series converters feature 1500 Volt DC

isolation from input to output. The input to output DC

resistance is greater than 10MΩ. These converters

are provided with Basic insulation between input and

output circuits according to all IEC60950 based

standards. Nevertheless, if the system using the

converter needs to receive safety agency approval,

certain rules must be followed in the design of the

system. In particular, all of the creepage and

clearance requirements of the end-use safety

requirements must be observed. These documents

include UL60950, CSA60950-00 and EN60950,

although other additional requirements may be

needed for user’s specific applications.

The HLS Series converters have no internal fuse.

An external fuse must be provided to protect the

system from catastrophic failure, as illustrated in

Figure 6. The fuse with a rating not greater than

10 A is recommended. The user can select a lower

rating fuse based upon the highest inrush transient

at the maximum input voltage and the maximum

input current of the converter at the minimum input

voltage. Both input traces and the chassis ground

trace (if applicable) must be capable of conducting a

current of 1.5 times the value of the fuse without

opening. The fuse must not be placed in the

grounded input line, if any.

In order for the output of the HLS Series converter to

be considered as SELV (Safety Extra Low Voltage)

or TNV-1, according to all IEC60950 based

standards, one of the following requirements must be

met in the system design:

• If the voltage source feeding the module is SELV

or TNV-2, the output of the converter may be

grounded or ungrounded.

• If the voltage source feeding the module is ELV,

the output of the converter may be considered

SELV only if the output is grounded per the

requirements of the standard.

• If the voltage source feeding the module is a

Hazardous Voltage Secondary Circuit, the

voltage source feeding the module must be

provided with at least Basic insulation between

the source to the converter and any hazardous

voltages. The entire system, including the HLS

converter, must pass a dielectric withstand test

for Reinforced insulation. Design of this type of

system requires expert engineering and

understanding of the overall safety requirements

and should be performed by qualified personnel.

Thermal Considerations

The HLS Series converters are designed for natural

or forced convection cooling. The maximum

allowable output power of the converters is

determined by meeting the derating criteria of all

electronic components used in the power supplies.

An example of the derating criteria for the

semiconductor junction temperature is not to exceed

120 °C to provide reliable, long-term operation of the

converters.

The graphs in Figures 10-14 show the maximum

output current of the HLS Series converters at

different ambient temperatures under both natural

and forced (longitudinal airflow direction, from pin 1

to pin 4) convection. This is further illustrated in Fig.

9 as arrow ‘A’. As an example, from Figure 10, the

HLS30ZG operating at 55 °C can deliver up to 22 A

reliably with 100 LFM forced air, while up to 25 A

reliably with 200 LFM forced air.

C

A

Pin side down

B

Figure 9. HLS Forced Airflow Directions (A, B, C)

Airflow directions ‘A’ and ‘C’ should be considered

equivalent in terms of the cooling effectiveness each

provides. Direction ‘B’ can offer a marginal (< 3.5%)

power capability improvement over that offered by ‘A’

or ‘C’. This characteristic is demonstrated in Fig. 15.

Note:

Figure 15 was established with Vin = 48 VDC, and figures 10-14

at Vin = 52 VDC. The resulting small difference in converter

efficiency introduces an error term that prevents accurate

correlation directly between figures 10 and 15.)

FEB 17, 2006 revised to JUL 25, 2006

Page 8 of 10

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