QTS48T46096 DC-DC Converter Data Sheet
441-Watt @ 48Vin Quarter-Brick Bus Converter
Features
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RoHS lead-free and lead-solder-exempt
products are available
Delivers up to 500 watts with a 55 VDC input
Cost-effective, single-board design
5:1 Fixed ratio converter
Ultra-high efficiency over 97%
0.48” maximum height (12.2 mm)
Narrow input range 36 – 55 VDC
Parallel operation (3 units)
Input-to-output isolation: 1500 VDC
Start-up into high capacitive load
Low conducted and radiated EMI
Output overcurrent protection
Input undervoltage lockout
Input overvoltage shutdown
Overtemperature protection
Approved to UL 60950-1/ CAN/CSA-C22.2 No.
60950-1-03, and TUV approved to EN 60950-1,
IEC 60950-1
Applications
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Intermediate Bus architectures
Telecommunications equipment
LAN/WAN
Data processing
Description
The QTS48T46096 bus converter provides a 5:1 fixed ratio, isolated, step-down voltage. Output voltage is directly
proportional to input voltage with a conversion ratio of 5:1; at 48 VDC the resulting output voltage would be
9.6 VDC. The converter provides ultra-high efficiency over 97%; as a result very little heat is dissipated and a heat
sink is not required.
The QTS48T46096 is an excellent choice for intermediate bus applications where multiple output voltages are
required and a 9.6 V rail will be used to power “Point of Load” devices.
Model Selection
Model
Input
Voltage
VDC
Input
Current,
Max ADC
Output
Voltage
Vout,@ 48Vin
VDC
9.6
Output
Current (A)
Output
Ripple/Noise,
mV p-p (max.)
Typical
Efficiency @
48Vi, 39.5A
QTS48T46096-NCAP
36-55
9.3
46
250
97.3
This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment should be
followed.
ZD-02076 Rev 2.1
Page 1 of 7
www.power-one.com
QTS48T46096 DC-DC Converter Data Sheet
441-Watt @ 48Vin Quarter-Brick Bus Converter
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect long-
term reliability, and cause permanent damage to the converter.
Parameter
Input Voltage
Operating Temperature
Storage Temperature
Conditions/Description
Min
0
-40
-40
Max
55
125
125
Units
VDC
°C
°C
Continuous
*Case Temperature (Q11)
* If necessary the factory will provide an assembly drawing upon request to locate Q11
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Shock
Sinusoidal Vibration
Weight
Water Washing
MTBF
Conditions/Description
(Half-sinewave, 6ms), 3 axes
GR-63-CORE, Section 5.4.2
Standard process
Per Bellcore TR-NWT-000332
Min
Nom
50
1
1.7/48
Yes
3.5
Max
Units
g
g
Oz/g
MHrs
(Po= 260 W, T
A
= 30°C)
Isolation Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Insulation Safety Rating
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Conditions/Description
Input to Output
Min
1500
10
1100
Nom
Functional
Max
Units
VDC
MOhm
pF
Input Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Input Voltage
Turn-On Input Voltage
Turn-Off Input Voltage
Output Rise Time
Conditions/Description
Continuous
Ramping Up
Ramping Down
Time from Vo @ 10% of nominal to
Vo @ 90% of Nominal, w/ Load =
365 W resistor + 3000 µF capacitor
Full Load, 12
µH
source inductance
Vin=Vin.max
Vin
57
55
Min
36
33
31
0.5
Nom
48
35
32
Max
55
37
33
2
Units
VDC
VDC
VDC
ms
Input Reflected Ripple Current
Inrush Transient
Input Overvoltage Shutdown
Turn-off voltage threshold
Turn-on voltage threshold
50
1
59.5
58
mA p-p
A
2
s
ZD-02076 Rev 2.1
Page 2 of 7
www.power-one.com
QTS48T46096 DC-DC Converter Data Sheet
441-Watt @ 48Vin Quarter-Brick Bus Converter
Output Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Output Voltage over line load and
temperature
Output Current
Load Regulation
Turn-on overshoot
Transient response
Admissible Load Capacitance
Output Current Limit Threshold
Latch-Off (recycle power or toggle
shutdown pin to re-start)
Switching Frequency
Io
Vo
Vo
25% load step change @ 1A/µs
(% of Vo nominal)
I
rated
, Nom Vin
Po
110%
130%
Vo
Conditions/Description
Min
6.8
0
300
Nom
Max
11.5
46
500
3
±
4
3000
150%
Units
VDC
A
mV
%
%
µF
240
kHz
Feature Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Shutdown (ON/OFF)
Negative Logic
Converter ON
Source Current
Converter OFF
Positive Logic
Converter ON
Open Circuit Voltage
Converter OFF
Overtemperature Protection
Current Share Accuracy
Conditions/Description
On/Off signal is low – converter is ON
-0.5
ON/OFF pin is connected to -Vin
2.5
On/Off signal is low–converter is OFF
2.5
ON/OFF pin is floating
-0.5
Average board temperature
See Page 4. “Parallel Operation”
+130
5
37
5
0.8
+140
10
VDC
VDC
VDC
°C
%
0.8
1
37
VDC
mADC
VDC
Min
Nom
Max
Units
ZD-02076 Rev 2.1
Page 3 of 7
www.power-one.com
QTS48T46096 DC-DC Converter Data Sheet
441-Watt @ 48Vin Quarter-Brick Bus Converter
Characteristic Curves
Efficiency Vs Line, Load
Shutdown Feature Description
The ON/OFF pin in the QTS48T46096 converter
functions as a normal soft shutdown. It is referenced
to the –Vin pin (see Figure 2). With the 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.
36
48
55
99.00
97.00
Efficiency (%)
95.00
93.00
91.00
89.00
87.00
85.00
%
%
%
%
%
%
%
%
%
80
50
10
20
30
40
60
70
90
10
0%
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 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).
Load (%)
Figure 1. QTS48T46096 Efficiency vs. Output Load
Figure 2 shows the recommended connections for
the QTS48T46096 converter.
Parallel Operation
Figure 2. Typical Application of QTS48T46096
The QTS48T46096 converter does not require any
external components for proper operation. However,
if the distribution of the input voltage to the converter
contains significant inductance, a capacitor C1 may
be required to enhance performance of the
converter. A minimum of a 100
µF
electrolytic
capacitor with the ESR<0.5Ω at 100 kHz is
recommended for the QTS48T46096.
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 using a 10
µF
low ESR tantalum (AVX TPSC106M025R0500 is
used in our test setup) and a 1
µF
ceramic capacitor.
Note, that the capacitors do not substitute the
filtering required by the load.
The following precautions must be observed when
operating two or more QTS48T46096’s in parallel:
1. The inputs of all units must be attached to
the same voltage source
2. The PCB trace resistance into each unit
should be equalized as much as is practical.
3. The enable pins must be tied together and
operated as a single unit.
4. The undervoltage lockout start-up point will
vary from unit to unit, therefore the dv/dt of
the input source as it rises from 0V to its final
value will affect the ability of the parallel
units to turn on into a load equal to more that
the maximum rated load of 1 unit. The dv/dt
of the rising edge of the input voltage must
be greater than 2V/msec. If three units are
to be operated in parallel, it is strongly
recommended that the maximum load
current be limited to the maximum current
rating of a single unit until the output voltage
exceeds 90% of the rated output voltage.
5. The accuracy of the current sharing will be
affected by the series impedance between
each unit at the load. Balancing these
impedances will enhance the current share
accuracy.
www.power-one.com
ZD-02076 Rev 2.1
Page 4 of 7
QTS48T46096 DC-DC Converter Data Sheet
441-Watt @ 48Vin Quarter-Brick Bus Converter
6. Figure 3 shows the recommended airflow
direction, unit orientation and temperature
variation of three paralleled units with 10%
current share accuracy. Please note that the
maximum power available will be reduced by
up to 10% due to current share accuracy.
(At 48 volts in, the maximum power available
would be 350 W X 3unit X 90% derating =
945 W)
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 QTS48T46096
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:
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If the voltage source feeding the module is SELV
or TNV, 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.
This information is provided for guidance only
and the user is responsible for any design
considerations regarding safety.
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Thermal Considerations
The QTS48T46096 converter is designed for natural
or forced convection cooling.
The maximum
allowable output current of the converter is
determined by meeting the derating criteria for all
components used in the converter. For example,
the maximum semiconductor junction temperature is
not allowed to exceed 125 °C to ensure reliable long-
term operation of the converter. Contact Power-One
for the complete list of the derating criteria.
The graph in Figure 4 and Figure 5 show the
maximum output current of the QTS48T46096
converter at different ambient temperatures under
both natural and forced (transverse airflow direction,
from pin 1 to pin 3) convection.
For example, the QTS48T46096 operating at 48Vin,
70 °C can deliver up to 33.6A reliably with 200 LFM
forced air.
AIRFLOW DIRECTION
Figure 3. Three units in parallel with 50 V input voltage,
900 W output power, 70
°C
ambient, and 200 LFM airflow.
Safety Considerations
The QTS48T46096 converter features 1500 Volt DC
isolation from input to output. The input-to-output
resistance is greater than 10 MΩ. This converter is
provided with functional 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 QTS48T46096 converter has no internal fuse.
The external fuse must be provided to protect the
system from catastrophic failure. 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, which occurs at the minimum input
ZD-02076 Rev 2.1
Page 5 of 7
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