Q2S15 Series – 15A Quarter-Brick DC/DC Converter
48V, 24V Input
5.0V Output
Data Sheet
Features
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•
•
•
•
•
•
•
•
•
•
•
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Low profile ( < 8mm )
2000 VDC input-to-output isolation meets
basic insulation
High efficiency - to 88% at full load
Start-up into high capacitive load
Low conducted and radiated EMI
Output overcurrent protection
Output overvoltage protection
Overtemperature protection
Back drive 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 Recognized, CSA 22.2 No. 950-
95 certified, TUV IEC9
Applications
•
•
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Distributed power architectures
Telecommunications equipment
LAN/WAN applications
Data processing applications
Description
The new Q2S15 series of low profile, high-density, single-output DC/DC converters convert standard
telecom and datacom voltages into isolated low-voltage outputs. The Q2S’s leading-edge technology
provides high efficiency. The SMT mounting option eliminates the need for a separate (additional manual)
process in attaching the converters to the motherboards during mass production.
Base Model Selection Chart
Input
Output
Output rated
current,
voltage,
current,
max,
I rated
ADC
VDC
ADC
1.5
5.0
15
4.7
5.0
15
Model
Q2S15ZG
Q2S15YG
Input
voltage
range,
VDC
36-75
18-36
Output
Ripple /
Noise, Typ,
mV p-p
30
30
Efficiency
@ I rated,
Typical,
%
88
88
Location of the Thermocouple for Thermal Testing.
REV. JUN 12, 2002
Page 1 of 9
Q2S15 Series – 15A Quarter-Brick DC/DC Converter
48V, 24V Input
5.0V Output
Absolute Maximum Ratings
Data Sheet
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
ON/OFF Control Voltage
Conditions/Description
Continuous
Per GR-513, tp = 10µs
At 100% load
Referenced to -Vin
Min
Max
75
100
100
125
20
Units
VDC
VDC
°C
°C
VDC
-40
-40
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
Halfsine wave, 3 axes
GR-63-Core, Section 5.A.2
Standard process
Per Bellcore TR-NWT-000332
Min
50
1
Nom
Max
Units
g
Oz/g
kHrs
1.02(28)
Yes
Consult factory
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
Min
2000
10
230
Nom
Basic
Max
Units
VDC
MΩ
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
Turn-On Time
Input Reflected Ripple Current
Inrush Transient
REV. JUN 12, 2002
Conditions/Description
Continuous
Ramping Up Vin= 36-75
Vin = 18 -36
Ramping Down Vin = 36-75
Vin = 18-36
To Output Regulation Band
100% Resistive Load
25 MHz Bandwidth
Vin=Vin max
Min
36
18
33
16
31
15
Nom
48
24
Max
75
36
35
17.5
33
16.5
Units
VDC
VDC
VDC
ms
mA
pk.pk
0.1
A
2
s
Page 2 of 9
2.5
6
Q2S15 Series – 15A Quarter-Brick DC/DC Converter
48V, 24V Input
5.0V Output
Output Specifications
Data Sheet
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise
noted.
Parameter
Output Voltage Setpoint Accuracy
Output Current*
Line Regulation
Load Regulation
Total Output Voltage Regulation
Remote Sense Headroom***
Dynamic Regulation
Peak Deviation
Settling Time
Admissible Load Capacitance
Output Current Limit Threshold**
Switching Frequency
Over voltage Protection,
Non Latching
Trim Range****
Conditions/Description
Vin=Vin nom, Full Load
Vin min to Vin max,
Iout max
Vin=Vnom, Iout min to
Iout max
Over all input voltage, load,
and temperature conditions
50-75% load step change
to 1% error band
Iout.max, Nom Vin
Vout
≤0.97Vout
nom
Over all input voltage and
load conditions
Iout max, Vin=Vnom
120
100
16.5
115
-20
18
435
122
10,000
20
127
+10
mV
µS
µF
Adc
kHz
%Vout
%Vout
Min
-1
0
Nom
Max
1
15
±5
±5
Units
%Vout
ADC
mV
mV
±2
±2
4.925
5.000
5.075
10%
Vdc
%Vout
** Overcurrent protection is non-latching with auto recovery.
*** Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total
output voltage trim from all sources should not exceed 10% of Vout (Nom) in order to insure specified
operation of over-voltage protection circuitry.
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
- Converter OFF
Positive Logic
- Converter ON
- Converter OFF
Overtemperature
Protection
Conditions/Description
On/Off signal is low – converter is ON
ON/OFF pin is connected to -Vin
On/Off signal is low –converter is OFF
ON/OFF pin is connected to -Vin
PCB Temperature
Min
Nom
Max
Units
-20
2.4
2.4
-20
118
0.8
20
20
0.8
VDC
VDC
VDC
VDC
°C
REV. JUN 12, 2002
Page 3 of 9
Q2S15 Series – 15A Quarter-Brick DC/DC Converter
48V, 24V Input
5.0V Output
Characteristic curve
0.95
0.90
0.85
Efficiency
0.80
0.75
0.70
0.65
0
2
4
6
8
10
12
14
16
Load Current [Adc]
72 V
54 V
36 V
Data Sheet
converter.
Note, that the capacitors do not
substitute the filtering required by the load.
Shutdown Feature Description
The ON/OFF pin in the Q2S15 series converters
functions as a normal soft shutdown.
It is
referenced to the –Vin pin (see Figure 2). 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
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. 1.
Q2S15ZG (5.0V) Efficiency vs. Load
Typical Application
Figure 2 shows the recommended connections for
the Q2S15 series converter.
Fig. 2.
Typical Application of Q2S15 Series
The Q2S15 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, a
capacitor may be required to enhance
performance of the converter. A minimum of a
100µF electrolytic capacitor with the ESR<0.7Ω is
recommended for the Q2S15 series.
If magnitude of the inrush current needs to be
limited, see the “Inrush Current Control
Application Note” on the Power-One website at
www.power-one.com.
For output decoupling we recommend using a
10μF tantalum and a 1μF ceramic capacitor
connected directly across the output pins of the
REV. JUN 12, 2002
Output Voltage Trim
The trim feature allows the user to adjust the
output voltage from the nominal value. This can
be used to compensate distribution drops,
perform margining in production, or accommodate
other requirements when output voltage needs to
be adjusted from the nominal.
The converter’s output voltage (at the terminals)
can be adjusted up 10% or down 20% relative to
the nominal output voltage by connecting the
TRIM pin to sense (+) or sense (-) via a trim
resistor. The Trim pin should be left open if the
trimming function is not to be used.
To trim up the output voltage, a trim resistor, RT-
INCR, should be connected between TRIM (Pin 6)
Page 4 of 9
Q2S15 Series – 15A Quarter-Brick DC/DC Converter
48V, 24V Input
5.0V Output
and SENSE(+) (Pin 7), as illustrated in Fig. 3.
The trim-up resistor can be calculated from:
Data Sheet
Fig. 3.
5.1(100+Δ)V
O-NOM
– 624.75
__________________________________
1.225
Δ
- 10.2 [KΩ]
R
T-INCR
=
where,
R
T-INCR
=
Required value of trim-up resistor
V
O-NOM
= Nominal value of output voltage
insert absolute value bars
Δ
=
V
O-REQ
- V
O-NOM
_________________________
V
O-NOM
x 100
[%]
V
O-REQ
= Desired (trimmed) output voltage
When trimming up, care must be taken not to
exceed the converter‘s maximum allowable output
power, as discussed in the previous section
Remote Sense.
To trim down the output voltage, a trim resistor,
R
T-DECR
, should be connected between TRIM (Pin
6) and SENSE(-) (Pin 5), as illustrated in Fig.4.
Fig. 4.
The trip-down resistor can be calculated from:
R
T-DECR
=
____________
510
Δ
- 10.2
[KΩ]
where,
R
T-DECR
=
.
Required value of trim-down resistor
and
Δ
is as defined above.
REV. JUN 12, 2002
Page 5 of 9
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