DATA SHEET
SQE48T20120 DC-DC CONVERTER
36-75V
DC
Input; 12V
DC
, 20A, 240W Output
FEATURES
Industry-standard quarter-brick pinout;
Delivers 240W at 94.2% efficiency;
Withstands 100V input transient for 100ms;
Fixed-frequency operation;
On-board input differential LC-filter;
Start-up into pre-biased load;
No minimum load required;
Meets Basic Insulation requirements;
Fully protected (OTP, OCP, OVP, UVLO);
Positive or negative logic ON/OFF option;
Low height of 0.44” (11.18mm);
Weight: 32g w/o baseplate, 40g with baseplate;
High reliability: MTBF = 14.3 million hours, calculated per Telcordia SR-
332, Method I Case 1;
Approved to the following Safety Standards: UL/CSA60950-1, EN60950-
1, and IEC60950-1;
Designed to meet Class B conducted emissions per FCC and EN55022
when used with external filter;
All materials meet UL94, V-0 flammability rating.
APPLICATIONS
o
o
o
o
Intermediate Bus Architectures
Data communications/processing
LAN/WAN
Servers, Workstations
BENEFITS
High efficiency – no heat sink
required
1
Industry-standard 1/8
th
brick
footprint: 0.896” x 2.30” (2.06 in
2
)
- 38% smaller than conventional
quarter-bricks
DESCRIPTION
The new high performance 20A
SQE48T20120
DC-DC converter provides a high efficiency single output, in a 1/8
th
brick package that
is only 62% the size of the industry-standard quarter-brick. Specifically designed for operation in systems that have limited airflow and
increased ambient temperatures, the SQE48T20120 converter utilizes the same pinout and Input/Output functionality of the industry-
standard quarter-bricks. In addition, a heat-spreader (baseplate) feature is available (-xDxBx suffix) that provides an effective thermal
interface for coldplate and heat sinking options.
The SQE48T20120 converter thermal performance is accomplished through the use advanced circuits, packaging, and processing
techniques to achieve ultra-high efficiency, excellent thermal management, and a low-body profile.
Operating from a wide-range 36-75V input, the SQE48T20120 converter provides a fully regulated 12V output voltage. Employing a
standard power pinout, the SQE48T20120 converter is an ideal drop-in replacement for existing high current quarter-brick designs.
Inclusion of this converter in a new design can result in significant board space and cost savings. The designer can expect reliability
improvement over other available converters because of the SQE48T20120’s optimized thermal efficiency.
1
Baseplate/heat-spreader option (suffix ‘-xDxBx’) facilitates heatsink mounting to further enhance the unit’s thermal capability.
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DATA SHEET
1
ELECTRICAL SPECIFICATIONS
PARAMETER
NOTES
Absolute Maximum Ratings
Continuous
Transient (100ms)
Ambient (T
A
)
2
Component
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=100 µ F, unless otherwise specified.
MIN
-0.3
-40
-40
-40
-55
TYP
MAX
80
100
85
125
105
125
UNITS
VDC
VDC
°C
°C
°C
°C
VDC
Input Voltage
Operating Temperature
(See Derating Curves)
Storage Temperature
(T
C
)
Baseplate (T
B
)
Isolation Characteristics
I/O Isolation
Isolation Capacitance
Isolation Resistance
Input to Baseplate
Output to Baseplate
Dielectric strength
UL/CSA60950-1, EN60950-1, and IEC60950-1.
Basic Insulation
2,250
1200
10
1,500
1,500
pF
MΩ
VDC
VDC
Feature Characteristics
Switching Frequency
Output Voltage Trim Range
3
Remote Sense Compensation
3
Output Overvoltage Protection (Non-latching)
Over Temperature Shutdown (Non-latching)
Auto-Restart Period
Turn-On Time from Vin
Turn-On Time from ON/OFF Control
Turn-On Time from Vin
(w/ Co max.)
Turn-On Time from ON/OFF Control
(w/ Co max.)
ON/OFF Control (Positive Logic)
ON/OFF Control (Negative Logic)
110
2
428
450
n/a
n/a
120
130
250
22
12
22
12
502
kHz
%
%
130
%
°C
ms
Component (T
C
)
Applies to all protection features
Time from UVLO to Vo=90%V
OUT
(
NOM
)
Resistive load
Time from ON to Vo=90%V
OUT
(
NOM
)
Resistive load
Time from UVLO to Vo=90%V
OUT
(
NOM
)
Resistive load, C
EXT
=10,000µ F load
Time from ON to Vo=90%V
OUT
(
NOM
)
Resistive load, C
EXT
=10,000µ F load
Converter Off (logic low)
Converter On (logic high)
Converter Off (logic low)
Converter On (logic high)
Input Characteristics
25
15
25
15
0.8
20
20
0.8
ms
ms
ms
ms
VDC
VDC
VDC
VDC
VDC
VDC
VDC
VDC
ADC
mA
mA
mA
PK-PK
mA
RMS
mA
PK-PK
mA
RMS
dB
-20
2.4
2.4
-20
36
31.5
30
1.5
48
34.5
32
2.0
3
50
70
760
265
8
2
45
Operating Input Voltage Range
Input Undervoltage Lockout
Turn-on Threshold
Turn-off Threshold
Lockout Hysteresis Voltage
Maximum Input Current
Input Standby Current
Input No Load Current (No load on the output)
Input Reflected-Ripple Current, ic
Input Reflected-Ripple Current, i
S
Input Voltage Ripple Rejection
2
3
75
35.5
34.0
2.5
7.3
5
130
900
325
14
5
Po = 240W @ 36VDC In
Vin = 48V, converter disabled
Vin = 48V, converter enabled
Vin = 48V, 25 MHz bandwidth,
Po=240W (Figs. 19, 20, 21)
120 Hz
Reference Figure E for component (T
C
and T
B
) locations.
This functionality not provided, however the unit is fully regulated.
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DATA SHEET
1
ELECTRICAL SPECIFICATIONS (CONTINUED)
PARAMETER
NOTES
Output Characteristics
V
IN
=48V, I
OUT
=0Amps, T
A
=25° C
I
OUT
=20Amps, T
A
=25° C
V
IN
=48V, , T
A
=25° C
Over line, load and temperature
I
OUT
=20Amps,
C
EXT
=10 µ F tantalum + 1 µ F ceramic
I
OUT
=20Amps (resistive)
C
EXT
ESR
0
4
1
0
22
25
2.4
75
30
Efficiency
@ 100% Load
@ 60% Load
48V
IN
, T
A
=25° C, 300LFM
94.2
94
%
%
11.64
50
25
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=100 µ F, unless otherwise specified.
MIN
11.76
TYP
12.00
± 12
±6
MAX
12.24
± 24
± 12
12.36
100
50
10,000
20
29
5
140
50
UNITS
VDC
mV
mV
VDC
mV
PK-PK
V
RMS
µF
mOhm
ADC
ADC
A
RMS
mV
µs
Output Voltage Setpoint
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise – 25 MHz bandwidth
Admissible External Load Capacitance
Output Current Range
Current Limit Inception
RMS Short-Circuit Current
Load Change 50%-75%-50% of I
OUT
Max
(di/dt = 0.1 A/μs)
Settling Time to 1% of V
OUT
Non-latching
Non-latching Short = 10 mΩ
Dynamic Response
C
EXT
= 10µ F tantalum + 1µ F ceramic
2
ENVIRONMENT AND MECHANICAL SPECIFICATIONS
PARAMETER
NOTES
Environmental
Non-condensing
Non-condensing
Mechanical
Without baseplate
With baseplate
GR-63-CORE, Sect. 5.4.2
Half Sinewave, 3-axis
Reliability
Telcordia SR-332, Method I Case 1
50% electrical stress, 40° C components
EMI and Regulatory Compliance
1
50
32
40
MIN
TYP
MAX
95
95
UNITS
%
%
g
g
g
g
Operating Humidity
Storage Humidity
Weight
Vibration
Shocks
MTBF
14.3
MHrs
Conducted Emissions
CISPR 22 B with external EMI filter network
4
See
“Input Output Impedance”,
Page 4.
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DATA SHEET
3
3.1
OPERATIONS
INPUT AND OUTPUT IMPEDANCE
These power converters have been designed to be stable with no external capacitors when used in low inductance input and
output circuits.
However, in some applications, the inductance associated with the distribution from the power source to the input of the
converter can affect the stability of the converter. A 100 µ F electrolytic capacitor with adequate ESR based on input
impedance is recommended to ensure stability of the converter.
In many end applications, a high capacitance value is applied to the converter’s output via distributed capacitors. The power
converter will exhibit stable operation with external load capacitance up to 10,000 µ F.
3.2
ON/OFF (PIN 2)
The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control
options available, positive and negative logic, with both referenced to Vin(-). A typical connection is shown in Figure A.
The positive logic version turns on when the ON/OFF pin is at a logic high or left open and turns off when it is at a logic low.
See the Electrical Specifications for logic high/low definitions.
Fig. A: Typ. Circuit configuration for ON/OFF function.
The negative logic version turns on when the ON/OFF pin is at a logic low and turns off when the pin is at logic high. To
enable automatic power up of the converter without the need of an external control signal the ON/OFF pin can be hard wired
directly to Vin(-) for N and left open for P version.
The ON/OFF pin is internally pulled up to 5V through a resistor. A properly de-bounced mechanical switch, open-collector
transistor, or FET can be used to drive the input of the ON/OFF pin. The device must be capable of sinking up to 0.2 mA at a
low level voltage of
0.8 V. An external voltage source (± 20 V maximum) may be connected directly to the ON/OFF input, in
which case it must be capable of sourcing or sinking up to 1 mA depending on the signal polarity. See the Startup
Information section for system timing waveforms associated with use of the ON/OFF pin.
4
4.1
PROTECTION FEATURES
INPUT UNDERVOLTAGE LOCKOUT (UVLO)
Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops below a
pre-determined voltage.
The input voltage must be typically 35V for the converter to turn on. Once the converter has been turned on, it will shut off
when the input voltage drops typically below 33V. This feature is beneficial in preventing deep discharging of batteries used
in telecom applications.
4.2
OUTPUT OVERCURRENT PROTECTION (OCP)
The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the
converter will shut down after entering the constant current mode of operation, regardless of the value of the output voltage.
Once the converter has shut down, it will enter hiccup mode with attempt to restart every 260ms until the overload or short
circuit conditions are removed.
SQE48T20120 DC-DC Converter
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DATA SHEET
4.3
OUTPUT OVERVOLTAGE PROTECTION (OVP)
The converter will shut down if the output voltage across Vout(+) and Vout(-) exceeds the threshold of the OVP circuitry. The
OVP circuitry contains its own reference, independent of the output voltage regulation loop. Once the converter has shut
down, it will attempt to restart every 260 ms until the OVP condition is removed.
4.4
OVERTEMPERATURE PROTECTION (OTP)
The converter will shut down under an overtemperature condition to protect itself from overheating caused by operation
outside the thermal derating curves, or operation in abnormal conditions. The converter will automatically restart after it has
cooled to a safe operating temperature.
4.5
SAFETY REQUIREMENTS
The converters are safety approved to UL/CSA60950-1, EN60950-1, and IEC60950-1. Basic Insulation is provided between
input and output.
The converters have no internal fuse. To comply with safety agencies requirements, an input line fuse must be used external
to the converter. A 10A fuse is recommended for use with this product. The fuse must not be placed in the grounded input
line.
The SQE48 converter is UL approved for a maximum fuse rating of 15Amps.
4.6
ELECTROMAGNETIC COMPATIBILITY (EMC)
EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC characteristics
of board mounted component dc-dc converters exist. However, Power-One tests its converters to several system level
standards, primary of which is the more stringent EN55022, Information technology equipment - Radio disturbance
characteristics - Limits and methods of measurement.
An effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC.
With the addition of an external filter, the SQE48T20120 converter will pass the requirements of Class B conducted
emissions per EN55022 and FCC requirements. Refer to Figures 18 – 19 for typical performance with external filter.
4.7
STARTUP INFORMATION (USING NEGATIVE ON/OFF)
Scenario #1: Initial Startup From Bulk Supply
ON/OFF function enabled, converter started via application of V
IN
. See Figure B.
Time
Comments
t
0
ON/OFF pin is ON; system front-end power is toggled on, V
IN
to converter begins to rise.
t
1
V
IN
crosses undervoltage Lockout protection circuit threshold; converter enabled.
t
2
Converter begins to respond to turn-on command (converter turn-on delay).
t
3
Converter V
OUT
reaches 100% of nominal value.
For this example, the total converter startup time (t
3
- t
1
) is typically 22 ms.
Fig. B: Startup scenario #1.
V
IN
ON/OFF
STATE
OFF
ON
V
OUT
t
0
t
1
t
2
t
3
t
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