SQL48T15033 DC-DC Converter
36-75 VDC Input; 3.3 VDC @ 15A Output
Preliminary Data Sheet
Features
•
RoHS lead-free solder and lead-solder-exempted
products are available
•
Industry-standard quarter-brick pin-out
•
Delivers 3.3V @ 15A with no thermal derating
@ 48Vin
•
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 of EN60950-1
•
Fully protected (OTP, OCP, OVP, UVLO)
•
Remote output sense
•
Positive or negative logic ON/OFF option
•
Output voltage trim range: +10%/−20%
with
Industry Standard trim equations
•
Low height of 0.375” (9.5mm)
•
Weight: 21.4g, 32.9g w/baseplate
•
High reliability: MTBF approx. 23.6 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
•
•
•
•
Telecommunications
Data communications/processing
LAN/WAN
Servers, Workstations
Benefits
•
High efficiency – no heat sink required
th
•
Industry-standard 1/8 brick footprint: 0.896” x
2
2.30” (2.06 in ) - 38% smaller than conventional
quarter-bricks
1
Description
The new high performance 15A SQL48T15033 DC-DC converter provides a high efficiency single output, in a 1/8
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 SQL48T15033 converter utilizes the
same pin-out and Input/Output functionality of the industry-standard quarter-bricks. In addition, a heat spreader
feature is available (-xxxBx suffix) that provides an effective thermal interface for coldplate and heat sinking
options.
The SQL48T15033 converter thermal performance is accomplished through the use of patent-pending circuits,
packaging, and processing techniques 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 wide-range 36-75V input, the SQL48T15033 converter provides a fully regulated 3.3V output
voltage. The outputs can be trimmed from –20% to +10% of the nominal output voltage, thus providing outstanding
design flexibility. Employing a standard power pin-out, the SQL48T15033 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 SQL48T15033’s optimized thermal efficiency.
1
th
Baseplate/heat spreader option (suffix ‘-xxxBx’) facilitates heatsink mounting to further enhance the unit’s thermal capability.
Rev 0.2, 3-Mar-11
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Page 1 of 14
SQL48T15033 DC-DC Converter
36-75 VDC Input; 3.3 VDC @ 15A Output
Preliminary Data Sheet
Electrical Specifications
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
Parameter
Absolute Maximum Ratings
Input Voltage
Operating Temperature
1
Notes
Continuous
Transient (100ms)
Ambient (T
A
)
Component (T
C
)
Min
-0.3
-40
-40
-40
-55
2,250
Typ
Max
80
100
85
120
105
125
Units
VDC
VDC
°C
°C
°C
°C
VDC
(See Derating Curves)
Baseplate (T
B
)
Storage Temperature
Isolation Characteristics
I/O Isolation
Isolation Capacitance
Isolation Resistance
Input to Baseplate
Output to Baseplate
10
1,500
1,500
270
pF
MΩ
VDC
VDC
Feature Characteristics
Switching Frequency
Output Voltage Trim Range
2
2, 4
445
Industry-std. equations
Percent of V
OUT
(
NOM
)
Non-latching
Non-latching
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
Converter Off (logic low)
Converter On (logic high)
Converter Off (logic high)
Converter On (logic low)
120
125
200
5
5
-20
2.4
2.4
-20
20
20
0.8
20
20
0.8
3
kHz
+10
+10
140
%
%
%
°C
ms
ms
ms
VDC
VDC
VDC
VDC
-20
Remote Sense Compensation
Output Overvoltage Protection
Over Temperature Shutdown
Auto-Restart Period
Turn-On Time from Vin
Turn-On Time from ON/OFF Control
ON/OFF Control (Positive Logic option)
ON/OFF Control (Negative Logic option)
Additional Notes:
1
Reference Figure H for component (T
C
and T
B
) locations.
2
Vout can be increased up to 10% via the sense leads or up to 10% via the trim function. However, the total output voltage trim-up should
not exceed 10% of V
OUT
(
NOM
).
3
Trim equations are defined within this document’s “Operations” section.
4
When using remote sense a minimum of 100uF ceramic capacitance should be mounted between Vout(+) and Vout(-) close to pin 8 and
pin 4.
Rev 0.2, 3-Mar-11
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Page 2 of 14
SQL48T15033 DC-DC Converter
36-75 VDC Input; 3.3 VDC @ 15A Output
Preliminary Data Sheet
Electrical Specifications (continued)
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
Parameter
Input Characteristics
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,
Input Reflected-Ripple Current,
Input Voltage Ripple Rejection
Notes
Min
36
31.5
30
1.0
Typ
48
33.5
32
Max
75
35.5
34
2.0
1.55
Units
VDC
VDC
VDC
VDC
ADC
mADC
mADC
3.3 Vout, Full Load @ 36VDC In
Vin = 48V, converter disabled
Vin = 48V, converter enabled
Vin = 48V, 20 MHz bandwidth,
Full Load (resistive)
(See Fig. J)
@ 120 Hz
V
IN
=48V, I
OUT
=0Amps, T
A
=25°C
I
OUT
=15Amps, T
A
=25°C
V
IN
=48V, , T
A
=25°C
Over line, load and temperature
I
OUT
=15Amps,
C
EXT
=10 µF tantalum + 1 µF ceramic
Plus Full Load (resistive)
C
EXT
ESR
0
1
0
16.5
19.5
25
4
3.2
30
15
3.25
5
45
200
ic
i
S
400
150
30
5
60
3.3
±2
±2
3.35
±17
±17
3.4
100
30
7,500
15
22.5
8
mA
PK-PK
mA
RMS
mA
PK-PK
mA
RMS
dB
VDC
mV
mV
VDC
mV
PK-PK
V
RMS
µF
mOhm
ADC
ADC
Amps
A
RMS
Output Characteristics
Output Voltage Setpoint
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise – 20 MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Short-Circuit Current
Pk:
RMS:
Non-latching
Non-latching Short = 10 mΩ
1
Dynamic Response
Load Change 50%-75%-50% of I
OUT
Max
Settling Time to 1% of V
OUT
di/dt = 0.1
A/μs
C
EXT
= 10µF tantalum + 1µF ceramic
di/dt = 1.0
A/μs
C
EXT
= 470µF POS + 1µF ceramic
±40
±70
20
@ 100% Load
@ 50% Load
Additional Notes:
1
mV
mV
µs
%
%
Efficiency
48V
IN
, T
A
=25°C, 300LFM (1.5 m/s)
91
89
See
“Input & Output Impedance”,
Page 4.
Rev 0.2, 3-Mar-11
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Page 3 of 14
SQL48T15033 DC-DC Converter
36-75 VDC Input; 3.3 VDC @ 15A Output
Preliminary Data Sheet
Environment and Mechanical Specifications
Environmental
Operating Humidity
Storage Humidity
Mechanical
Weight
Reliability
MTBF
EMI and Regulatory Compliance
Conducted Emissions
Safely Agency Approvals
CISPR 22 B with external EMI filter network
UL60950-1/CSA60950-1, EN60950-1 and IEC60950-1
Telcordia SR-332, Method I Case 1
50% electrical stress, 40°C components
~23.6
MHrs
No Baseplate
With Baseplate
21.4
32.9
g
g
RH (Non-condensing)
RH (Non-condensing)
95
95
%
%
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.
In many applications, the inductance associated with
the distribution from the power source to the input of
the converter can affect the stability of the converter.
The addition of a 33 μF electrolytic capacitor with an
ESR <1 Ω across the input helps to ensure stability
of the converter. In applications where decoupling
capacitance is distributed at the load, the power
converter will exhibit stable operation with up to the
maximum admissible external load capacitance up to
7,500
µF and ESR > 1mΩ.
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.
Vin (+)
The positive logic version turns on when the ON/OFF
pin is at logic high and turns off when at 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
logic low and turns off when the pin is at 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 5 VDC 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.
Remote Sense
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
regulation is required (see Fig. B). When using remote
sense a minimum of 100uF ceramic capacitance
should be mounted between Vout(+) and Vout(-) close
to the pin 8 and pin 4.
SQL 48 Converter
Vout (+)
(Top View)
SENSE (+)
TRIM
SENSE (-)
Rload
Vin
ON/OFF
Vin (-)
CONTROL
INPUT
Vout (-)
Fig. A: Typ. Circuit configuration for ON/OFF function.
Rev 0.2, 3-Mar-11
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Page 4 of 14
SQL48T15033 DC-DC Converter
36-75 VDC Input; 3.3 VDC @ 15A Output
Preliminary Data Sheet
SQL 48 Converter
Vin (+)
(Top View)
ON/OFF
Rw
Vout (+)
100
SENSE (+)
Vin
TRIM
SENSE (-)
10
Rload
The TRIM pin should be left open if trimming is not
being used. To minimize noise pickup, a 0.1 µF
capacitor is connected internally between the TRIM
and SENSE(-) pins.
To increase the output voltage (Fig. C) a trim resistor,
R
T-INCR
, should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of
Vin (-)
Vout (-)
Rw
Fig. B: Remote sense circuit configuration.
R
T
−
INCR
=
where,
5.11(100
+
Δ)V
O
−
NOM
−
626
−
10.22
1.225Δ
Caution:
If remote sensing is not utilized, the SENSE(-) pin
must be connected to the Vout(-) pin, and the
SENSE(+) pin must be connected to the Vout(+) pin to
ensure the converter will regulate at the specified
output voltage. If these connections are not made, the
converter will deliver an output voltage that is slightly
higher than the specified data sheet value.
[kΩ]
R
T-INCR
= Required value of trim-up resistor
[kΩ]
V
O-NOM
= Nominal value of output voltage [V]
Δ
=
(V
O -REQ
−
V
O -NOM
)
X 100
V
O -NOM
[%]
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)
circuitry 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
conditions.
When using remote sense, the output voltage at the
converter can be increased by as much as 10%
above the nominal rating in order to maintain the
required voltage across the load. Therefore, the
designer must, if necessary, decrease the maximum
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.
Output Voltage Adjust / TRIM
V
O-REQ
= 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.
Vin (+)
SQL 48 Converter
(Top View)
Vout (+)
R
T-INCR
Rload
SENSE (+)
Vin
ON/OFF
TRIM
SENSE (-)
Vin (-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
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
=
where,
511
−
10.22
|
Δ
|
[kΩ]
R
T-DECR
= Required value of trim-down
resistor [kΩ]
and
∆
is defined above.
Note:
The above equations for calculation of trim resistor values match
those typically used in conventional industry-standard quarter-bricks,
eighth-bricks and sixteenth-brick models.
SQL 48 Converter
(Top View)
ON/OFF
Vin (+)
Vout (+)
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. For
output voltage 3.3V, trim-up to 10% is guaranteed at
Vin
≥ 40V, and
to 8% at Vin
≥
36V.
SENSE (+)
TRIM
R
T-DECR
Rload
Vin
SENSE (-)
Vin (-)
Vout (-)
Rev 0.2, 3-Mar-11
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Page 5 of 14
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