DATA SHEET
SQE48T40015 DC-DC CONVERTER
36-75V
DC
Input; 1.5V
DC
, 40A, 60W Output
FEATURES
APPLICATIONS
o
o
o
o
Telecommunications
Data communications
Wireless communications
Servers, workstations
BENEFITS
High efficiency – no heat sink required
Higher current capability at elevated
temperatures than competitors’ 40A
quarter-bricks
Industry-standard eighth brick footprint:
0.896” x 2.30” (2.06 in
2
), 38% smaller
than conventional quarter-bricks
RoHS lead-free solder and lead-solder-exempted products are available
Delivers up to 40A
Industry-standard eighth-brick pinout
On-board input differential LC-filter
Start-up into pre-biased load
No minimum load required
Weight: 0.88 oz [25.1g]
Meets Basic Insulation requirements of EN60950
Withstands 100V input transient for 100ms
Fixed-frequency operation
Fully protected
Remote output sense
Positive or negative logic ON/OFF option
Low height of 0.374” (9.5mm)
Output voltage trim range: +10%/−20% with industry-standard trim equations
High reliability: MTBF = 15.4 million hours, calculated per Telcordia SR-332,
Method I Case 1
UL60950 recognized in US and Canada and DEMKO certified per
IEC/EN60950 (pending)
Designed to meet Class B conducted emissions per FCC and EN55022 when
used with external filter
All materials meet UL94, V-0 flammability rating
DESCRIPTION
The new high performance 40A
SQE48T40015
DC-DC converter provides a high efficiency single output, in an eighth 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 SQE48T40015 converter utilize the same pinout and functionality of the industry-standard
quarter-bricks.
The SQE48T40015 converter provides thermal performance in high temperature environments that exceeds most 40A quarter-bricks in
the market. This performance is accomplished through the use of patented/patent-pending circuits, packaging, and processing tech-
niques to achieve ultra-high efficiency, excellent thermal management, and a low-body profile.
Low-body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling for both upstream and
downstream devices. The use of 100% automation for assembly, coupled with advanced electronic circuits and thermal design, results
in a product with extremely high reliability.
Operating from a 36-75V input, the SQE48T40015 converter provides a 1.5V output voltage that can be trimmed from –20% to +10% of
the nominal output voltage, thus providing outstanding design flexibility.
With standard pinout and trim equations, the SQE48T40015 converter is a perfect drop-in replacement for existing 40A 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 SQE48T40015’s optimized thermal efficiency.
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DATA SHEET
1
ELECTRICAL SPECIFICATIONS
PARAMETER
NOTES
Continuous
Iout = 40A
Iout ≤ 32A
3001
-55
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µ F, unless otherwise specified.
MIN
-0.3
-40
TYP
MAX
80
85
3000
10000
125
UNITS
VDC
°C
m
m
°C
Absolute Maximum Ratings
Input Voltage
Operating Ambient Temperature
Operating Altitude
Storage Temperature
Isolation Characteristics
Standard Product: Option 0 (refer to
CONVERTER PART NUMBERING/ORDERING INFORMATION)
I/O Isolation
Isolation Capacitance
Isolation Resistance
Option
K
(refer to
CONVERTER PART NUMBERING/ORDERING INFORMATION)
I/O Isolation
Isolation Capacitance
Isolation Resistance
Feature Characteristics
Switching Frequency
Output Voltage Trim Range
1
Remote Sense Compensation
1
Output Overvoltage Protection
Overtemperature Shutdown (PCB)
Operating Humidity
Storage Humidity
Peak Back-drive Output Current
(Sinking current from external source)
during startup into pre-biased output
Back-drive Output Current (Sinking Current
from external source)
Auto-Restart Period
Turn-On Time
ON/OFF Control (Positive Logic)
Converter Off (logic low)
Converter On (logic high)
ON/OFF Control (Negative Logic)
Converter Off (logic high)
Converter On (logic low)
2.4
-20
20
0.8
VDC
VDC
-20
2.4
0.8
20
VDC
VDC
Industry-std. equations
Percent of VOUT(nom)
Non-latching
Non-latching
Non-condensing
Non-condensing
Peak amplitude
Peak duration
Converter OFF;
external voltage 5 VDC
Applies to all protection features
See Figures E, F, and G
1
50
10
200
3
15
50
117
122
-20
440
+10
+10
130
125
95
95
kHz
%
%
%
°C
%
%
ADC
µs
mADC
ms
ms
10
1500
200
1500
VDC
pF
MΩ
10
2250
160
VDC
pF
MΩ
Vout can be increased up to 10% via the sense leads or 10% via the trim function. However, the total output voltage trim from all sources should not ex-
ceed 10% of V
OUT
(
NOM
), in order to ensure specified operation of overvoltage protection circuitry.
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DATA SHEET
1
ELECTRICAL SPECIFICATIONS (CONTINUED)
PARAMETER
NOTES
MIN
36
33
32.5
1.0
100 ms
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µ F, unless otherwise specified.
TYP
48
MAX
75
35.5
34.5
2.0
100
7
0.1
UNITS
VDC
VDC
VDC
VDC
VDC
V/ms
A
2
s
ADC
mA
Input Characteristics
Operating Input Voltage Range
Input Undervoltage Lockout
Turn-on Threshold
Turn-off Threshold
Lockout Hysteresis Voltage
Input Voltage Transient
Input Voltage Transient Rate
Input Current Transient Rate
Maximum Input Current
Input Stand-by Current
Input No Load Current (0A load on the output)
Input Reflected-Ripple Current,
i
s
Input Voltage Ripple Rejection
Output Characteristics
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Output Voltage Set Point (no load)
2
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise – 25 MHz bandwidth
Dynamic Response
Load Change 50%-75%-50% of Iout Max,
di/dt = 0.1 A/μs
Settling Time to 1% of Vout
di/dt = 2.5 A/μs
Settling Time to 1% of Vout
Efficiency
100% Load
50% Load
Mechanical
Weight
Vibration IEC Class 3M5
Shocks IEC Class 3M5
Reliability
MTBF
Telcordia SR-332, Method I Case 1
50% electrical stress, 40° C ambient
15.4
MHrs
Freq. Velocity IEC 68-2-6
Freq. Accelerat. IEC 68-2-6
Accelerat. IEC 68-2-29
MIL-STD-202F
25.1g
5-9Hz 5mm/s
9-200Hz 1g
10g
Method 213B Cond. F
V
OUT
= 1.5 VDC
V
OUT
= 1.5 VDC
86.7
90
%
%
Over line, load and temperature
2
Full load + 10µ F tantalum + 1µ F ceramic V
OUT
= 1.5VDC
Co = 1 µ F ceramic (Figure 8)
Co = 470µ F POS + 1µ F ceramic (Figure 9)
-3.0
35
30
100
150
20
±2
±2
±5
±5
+3.0
mV
mV
%Vout
mV
PK-PK
mV
µs
mV
µs
Non-latching
Non-latching, Short = 10 mΩ
Non-latching
-1
12
+1
Plus full load (resistive)
0
42
20,000
40
48
50
µF
ADC
ADC
A
Arms
%Vout
40 ADC Out @ 36 VDC In
VOUT = 1.5 VDC
Vin = 48V, converter disabled
Vin = 48V, converter enabled
VOUT = 1.5 VDC
Vin = 48V, 25 MHz bandwidth
VOUT = 1.5 VDC
120 Hz, VOUT = 1.5 VDC
2.0
2
30
8
60
50
30
mA
mA
PK-PK
dB
2
Operating ambient temperature range of -40 ºC to 85 ºC for converter.
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DATA SHEET
2
2.1
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 con-
verter can affect the stability of the converter. A 33µ F electrolytic capacitor with an ESR < 1Ω across the input is recom-
mended to ensure stability of the converter over the wide range of input source impedance.
In many applications, the user has to use decoupling capacitance at the load. The power converter will exhibit stable opera-
tion with external load capacitance up to 20,000µ F.
2.2
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 Fig. A.
Fig. A: Circuit configuration for ON/OFF function.
Vin (+)
SQE48 Converter
(Top View)
Vout (+)
SENSE (+)
TRIM
SENSE (-)
Rload
Vin
ON/OFF
Vin (-)
CONTROL
INPUT
Vout (-)
The positive logic version turns on when the ON/OFF pin is at a logic high and turns off when the pin is at a logic low. The
converter is on when the ON/OFF pin is left open. See the Electrical Specifications for logic high/low definitions.
The negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. The ON/OFF
pin can be hard wired directly to Vin(-) to enable automatic power up of the converter without the need of an external control
signal.
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 0.2mA at a
low level voltage of
0.8V. An external voltage source (± 20V maximum) may be connected directly to the ON/OFF input, in
which case it must be capable of sourcing or sinking up to 1mA depending on the signal polarity. See the Startup Information
section for system timing waveforms associated with use of the ON/OFF pin.
2.3
REMOTE SENSE (Pins 5 and 7)
The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter
and the load. The SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should be connected at the load or at the point where regula-
tion is required (see Fig. B).
Fig. B: Remote sense circuit configuration.
SQE48 Converter
Vin (+)
(Top View)
ON/OFF
Rw
Vout (+)
100
SENSE (+)
Vin
TRIM
SENSE (-)
10
Rload
Vin (-)
Vout (-)
Rw
CAUTION
If remote sensing is not utilized, the SENSE(-) pin must be connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin must
be connected to the Vout(+) pin (Pin 8) to ensure the converter will regulate at the specified output voltage. If these connec-
tions are not made, the converter will deliver an output voltage that is higher than the specified data sheet value.
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DATA SHEET
Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces
should be run side by side and located close to a ground plane to minimize system noise and ensure optimum performance.
The converter’s output overvoltage protection (OVP) senses the voltage across Vout(+) and Vout(-), and not across the
sense lines, so the resistance (and resulting voltage drop) between the output pins of the converter and the load should be
minimized to prevent unwanted triggering of the OVP.
When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability of
the converter, which is equal to the product of the nominal output voltage and the allowable output current for the given con-
ditions.
When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rat-
ing in order to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the maxi-
mum current (originally obtained from the derating curves) by the same percentage to ensure the converter’s actual output
power remains at or below the maximum allowable output power.
2.4
OUTPUT VOLTAGE ADJUST /TRIM (Pin 6)
The output voltage can be adjusted up 10% or down 20%, relative to the rated output voltage by the addition of an externally
connected resistor.
The TRIM pin should be left open if trimming is not being used. To minimize noise pickup, a 0.1µ F capacitor is connected
internally between the TRIM and SENSE(-) pins.
To increase the output voltage, refer to Fig. C. A trim resistor, R
T-INCR
, should be connected between the TRIM (Pin 6) and
SENSE(+) (Pin 7), with a value of:
R
T
INCR
½
where,
5.11(100
Δ)V
O
NOM
626
10.22
1.225Δ
[kΩ],
R
TINCR
½
Required value of trim-up resistor kΩ]
V
ONOM
½
Nominal value of output voltage [V]
Δ
½
(V
O-REQ
V
O-NOM
)
X 100
V
O -NOM
[%]
V
OREQ
½
Desired (trimmed) output voltage [V].
When trimming up, care must be taken not to exceed the converter‘s maximum allowable output power. See the previous
section for a complete discussion of this requirement.
Fig. C: Configuration for increasing output voltage.
SQE48 Converter
(Top View)
SENSE (+)
Vin
ON/OFF
TRIM
SENSE (-)
Vin (-)
Vout (-)
R
T-INCR
Rload
Vin (+)
Vout (+)
To decrease the output voltage (Fig. D), a trim resistor, R
T-DECR
, should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
R
T
DECR
½
where,
511
10.22
|Δ|
[kΩ]
R
TDECR
½
Required value of trim-down resistor [kΩ] and
Δ
is defined above.
Note:
The above equations for calculation of trim resistor values match those typically used in conventional industry-
standard quarter-bricks.
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