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参数资料
| 型号： | QLS08ZH-NT |
| 厂商： | Power-One |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | DC/DC QTR BRICK 96W 12V OUT |
| 标准包装： | 21 |
| 系列： | * |
QLS08ZH Data Sheet
100W Quarter-Brick Converter
3.
The QLS08ZH converter will trim down further than the
10% limit. In general, this is permissible. The user
R UP = 5 . 11 ?
? Vout ( 100 + Δ V %) 100 + 2 Δ V % ?
Output Voltage Trim
The trim feature allows the user to adjust the output
voltage from the nominal. This can be used to
accommodate a different requirement or to do
production margin testing.
Industry Standard Trim
The converters trim up with a resistor from the TRIM
pin to the +Sense pin and trim down with a resistor
from the TRIM pin to the –Sense pin as shown in
Figure 4.
Figure 4 . QLS08ZH Positive Trim Schematic
The equations below determine the trim resistor
value required to achieve a Δ V change in the output
voltage.
? ? ,k Ω
? 1 . 225 Δ V % Δ V % ?
must confirm that the results are acceptable in the
application.
Safety Considerations
The QLS08ZH converter features 1500 Volt DC
isolation from input to output. The input-to-output
resistance is greater than 10MOhm. This converter
is 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 or additional requirements may be
needed for specific applications.
The QLS08ZH converter has no internal fuse. The
external fuse must be provided to protect the system
from catastrophic failure as shown in Figure 3. The
fuse with a rating not greater than 6A 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, which occurs 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 QLS08ZH 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:
R DOWN = 5 . 11 ?
? 2 ? , k Ω
? 100 ?
? Δ V % ?
Where Δ V% is the output voltage change expressed
in percents of the nominal output voltage, Vout.
NOTES :
1. When the output voltage is trimmed up, the output
power from the converter must not exceed its maximum
rating. The power is determined by measuring the
output voltage on the output pins, and multiplying it by
the output current.
2. In order to avoid creating apparent load regulation
degradation, it is important that the trim resistors are
connected directly to the remote sense pins, and not to
the load or to traces going to the load.
?
?
?
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
QLS08ZH converter, must pass a dielectric
withstand test for Reinforced insulation. Design
MCD10050 Rev. 1.0
Page 5 of 7
www.power-one.com
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