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PDF QLS30ZY Data sheet ( Hoja de datos )

Número de pieza QLS30ZY
Descripción QLS30 Series . 30A Quarter-Brick DC/DC Converter 48V Input 1.8V/ 1.5V/ 1.2V Output
Fabricantes Power One 
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QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
1.8V, 1.5V, 1.2V Output
Data Sheet
Features
Applications
Distributed power architectures
Telecommunications equipment
LAN/WAN applications
Data processing applications
Cost-effective single board design
Low profile – 11 mm height
Input/output isolation: 1500VDC, basic
insulation
High efficiency
Output back-drive protection
Start-up into high capacitive load
Low conducted and radiated EMI
Output overcurrent protection
Output overvoltage protection
Overtemperature protection
Remote sense
Set point accuracy ± 1%
Remote on/off (primary referenced), positive
or negative logic
Output voltage trim adjust, positive or
negative
UL 1950 Recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
Description
The new QLS30 series of single-output DC/DC converters features single board, multi-layer construction
and an SMT design that is highly reliable due to the low component count and minimal manufacturing touch
time. The QLS30 series uses fewer components than any other equivalently rated single board converter.
The converters can deliver a maximum of 30 Amps with a typical efficiency of 85%. The QLS provides
superior thermal performance, with minimal derating. The QLS30ZB model converter can deliver 22.8
amperes at 1.8 volt output in ambient conditions of 65°C and 200 LFM. This full featured, low profile
converter offers input undervoltage lockout, overload, overvoltage and overtemperature protection. Interface
features include remote on/off, remote sense and output voltage trim.
Selection Chart
Model
Input
Input
Output Output rated
Output
Typical
voltage current,
voltage
current
Ripple/Noise, Efficiency
VDC
max
ADC
Vout,
VDC
I rated,
ADC
mV p-p
@ I rated, %
QLS30ZB
36-75
1.5
1.8
30
100 86
QLS30ZA
36-75
1.3
1.5
30
100 85
QLS30ZY
36-75
1.1
1.2
30
100 84
This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment
should be followed.
REV. 10/1
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QLS30ZY pdf
QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
1.8V, 1.5V, 1.2V Output
Data Sheet
Typical Application
Figure 7 below shows the recommended
connections for the QLS30 series converter.
Fuse
C1
QLS30ZX
+Vi
On/Off
+Vo
+Sense
Trim
C2 C3
-Sense
-Vi -Vo
resistor between the ON/OFF pin and the +Vin
pin.
When the ON/OFF pin is used to achieve remote
control, the user must take care to insure that the
pin reference for the control is really the -Vin pin.
The control signal must not be referenced ahead
of EMI filtering, or remotely from the unit.
Optically coupling the information and locating the
optical coupler directly at the module will solve
any of these problems.
Note: If the ON/OFF pin is not used, it can be left
floating (positive logic), or connected to the -Vin
pin (negative logic).
Fig.7 Typical application of QLS30 series
The QLS30 series converters do not require any
external components for proper operation.
However, if the distribution of the input voltage to
the converter contains significant inductance, the
capacitor C1 may be required to enhance
performance of the converter. A minimum of a
33μF electrolytic capacitor with the ESR<0.7is
recommended for the QLS30 series.
Refer to the “Inrush Current Control Application
Note” on www.power-one.com for suggestions on
how to limit the magnitude of the inrush current.
For output decoupling we recommend to use a
10μF tantalum and a 1μF ceramic capacitors
connected directly across the output pins of the
converter. Note that the capacitors do not
substitute the filtering required by the load.
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. There are two
variances available in the QLS30 series.
Negative Trim (No suffix)
The QLS30 negative trim 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 Fig.8.
The negative trim schematic is shown in Figure 8.
Shutdown Feature Description
The ON/OFF pin in the QLS30 series converters
functions as a normal soft shutdown. It is
referenced to the –Vin pin (see Figure 7). With
positive logic, when the ON/OFF pin is pulled low,
the output is turned off and the unit goes into a
very low input power mode.
With negative logic, when the ON/OFF pin is
pulled low, the unit is turned on. An open collector
switch is recommended to control the voltage
between the ON/OFF pin and the -Vin pin of the
converter. The ON/OFF pin is pulled up
internally, so no external voltage source is
required. The user should avoid connecting a
REV. 10/01
Fig.8 QLS30 series negative trim schematic
The general equation (1) for changing the output
voltage on the negative trim modules is invariant,
but the constants in the equation change due to
different internal values.
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