QLS30ZA Просмотр технического описания (PDF) - Power-One Inc.
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QLS30ZA Datasheet PDF : 8 Pages
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QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
1.8V, 1.5V, 1.2V Output
Data Sheet
RTRIM
=
A − B × ∆V
∆V
,
kΩ (1)
where A and B are constants from the table
below, and ΔV is the absolute value of the desired
change in the output voltage in Volts.
Model
QLS30ZB
QLS30ZA
QLS30ZY
Trim up
A
B
0.57
1
0.283 0.121
0.5928 3.01
Trim down
A
B
0.2711 1.4676
0.065 0.352
0.5686 2.0422
Inductrial Standard Positive Trim (suffix –T)
The -T option units 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 the Figure 9.
RDOWN
=
5.11
100
2∆V %
−
1 ,KΩ
2
where ΔV% 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.
3. The QLS30 series converters will trim down
further than the 10% limit. In general, this is
permissible. The user must confirm that the
results are acceptable in the application.
Fig.9 QLS30 series positive trim schematic
The equations below determine the trim resistor
value required to achieve a ΔV change in the
output voltage.
RUP
=
5.11Vou1t.(212050∆+V∆%V
%)
−
100+ 2∆V
∆V %
%
,kΩ
RDOWN
=
5.11
100
∆V %
− 2 , kΩ
For QLS30ZY use the following equations.
RUP
=
5.11Vou1t.(212050∆+V∆%V
%)
,KΩ
REV. 10/01
Safety Considerations
The QLS30 series converters feature 1500 Volt
DC isolation from input to output. The input to
output resistance is greater than 10MOhm.
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 QLS30 series converters have no internal
fuse. An external fuse must be provided to
protect the system from catastrophic failure, as
illustrated in Figure 7. The fuse with a rating of
4A or less 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
Page 6 of 8
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