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DATA SHEET
3.5
SAFETY REQUIREMENTS
The converters meet North American and International safety regulatory requirements per UL60950 and EN60950. Basic
Insulation is provided between input and output.
The converters have no internal fuse. If required, the external fuse needs to be provided to protect the converter from cata-
strophic failure. Refer to the “Input Fuse Selection for DC/DC converters” application note on www.power-one-com for proper
selection of the input fuse. 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.
Abnormal and component failure tests were conducted with the input protected by a TBD fuse. If a fuse rated greater than
TBD A is used, additional testing may be required. To protect a group of converters with a single fuse, the rating can be in-
creased from the recommended value above.
3.6
ELECTROMAGNETIC COMPATIBILITY (EMC)
EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC characteristics
of board mounted component DC-DC converters exist. However, Power-One tests its converters to several system level
standards, primary of which is the more stringent EN55022, Information technology equipment - Radio disturbance charac-
teristics-Limits and methods of measurement.
An effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC.
With the addition of a simple external filter, the SQE48T40015 converter passes the requirements of Class B conducted
emissions per EN55022 and FCC requirements. Contact Power-One Applications Engineering for details of this testing.
3.7
STARTUP INFORMATION (USING NEGATIVE ON/OFF)
Scenario #1: Initial Startup From Bulk Supply
ON/OFF function enabled, converter started via application of V IN . See Figure E.
Time
t 0
t 1
t 2
t 3
Comments
ON/OFF pin is ON; system front-end power is toggled on, V IN to converter begins to rise.
V IN crosses undervoltage Lockout protection circuit threshold; converter enabled.
Converter begins to respond to turn-on command (converter turn-on delay).
Converter V OUT reaches 100% of nominal value.
For this example, the total converter startup time (t 3 - t 1 ) is typically 3 ms.
Fig. E: Startup scenario #1.
V IN
ON/OFF
STATE
OFF
ON
V OUT
ZD-01745_1.1_September-10-2013
t 0
t 1 t 2
t 3
7
t
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