SQ24T/S03150 DC-DC Converter Data Sheet
19-36 VDC Input; 15 VDC Output @ 3.3 A
Features
Description
The SemiQ™ Family of DC-DC converters provide a high-efficiency single output in a size that is only 60% of
industry-standard quarter-bricks, while preserving the same pinout and functionality.
In high-temperature environments, the thermal performance of SemiQ™ converters exceeds that of most
competitors' quarter-bricks. This is accomplished through the use of patent pending circuit, packaging and
processing techniques to achieve ultra-high efficiency, excellent thermal management, and a very low body profile.
Low body profile and the preclusion of heat sinks minimize airflow shadowing, thus enhancing cooling for
downstream devices. The use of 100% automation for assembly, coupled with advanced electrical and thermal
design results in a product with extremely high reliability.
With a standard pinout and trim equations, the SQ24 Series converters are perfect drop-in replacements for
existing quarter-brick designs. Inclusion of this converter in new designs can result in significant board space and
cost savings. The device is also available in a surface mount package.
In both cases the designer can expect reliability improvement over other available converters because of the
SQ24 Series’ optimized thermal efficiency.
RoHS lead-free solder and lead-solder-exempted
products are available
Delivers up to 3.3 A @ 15 V
Industry-standard quarter-brick pinout
Extremely small footprint: 0.896” x 2.30” (2.06 in
2
),
40% smaller than conventional quarter-bricks
Higher current capability at elevated temperatures
than most competitors' quarter-bricks
Onboard input differential LC-filter
High efficiency – no heat sink required
Start-up into pre-biased output
No minimum load required
Available in through-hole and SM packages
Low profile: 0.274” (6.96 mm)
Low weight: 0.53 oz (15 g)
Meets Basic insulation requirements
Fixed-frequency operation
Fully protected
Remote output sense
Output voltage trim range: +10%/−20% with
Industry-standard trim equations
High reliability: MTBF of 3.4 million hours,
calculated per Telcordia TR-332, Method I Case 1
Positive or negative logic ON/OFF option
Applications
Telecommunications
Data communications
Wireless
Servers
CAN/CSA C22.2, No. 60950-1/UL 60950-1
Second Edition, IEC/EN 60950-1 Second Edition
safety approved
Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
All materials meet 94, V-0 flammability rating
MCD10160 Rev.1.0, 01-Jun-10
Page 1 of 16
www.power-one.com
SQ24T/S03150 DC-DC Converter Data Sheet
19-36 VDC Input; 15 VDC Output @ 3.3 A
Electrical Specifications
Conditions: T
A
=25 ºC, Airflow=300 LFM (1.5 m/s), Vin=24 VDC, All output voltages, unless otherwise specified.
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Ambient Temperature
Storage Temperature
Continuous
NOTES
MIN
0
-40
-55
19
TYP
MAX
40
85
125
UNITS
VDC
°C
°C
VDC
VDC
VDC
VDC
pF
MΩ
kHz
%
%
%
ms
ms
VDC
VDC
VDC
VDC
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
Turn-off Threshold
24
17
16
36
17.5
16.5
Non-latching
16
15
2000
230
10
415
Industry-std. equations
Percent of V
OUT
(
NOM
)
Non-latching
Applies to all protection features
-20
117
125
100
4
+10
+10
140
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance:
Isolation Resistance
FEATURE CHARACTERISTICS
Switching Frequency
1
Output Voltage Trim Range
1
Remote Sense Compensation
Output Over-Voltage Protection
Auto-Restart Period
Turn-On Time
ON/OFF Control (Positive Logic)
Converter Off
Converter On
ON/OFF Control (Negative Logic)
Converter Off
Converter On
-20
2.4
2.4
-20
0.8
20
20
0.8
Additional Notes:
1.
Vout can be increased up to 10% via the sense leads or up to 10% via the trim function for Vin > 21 V; however total output voltage trim
from all sources should not exceed 10% of V
OUT
(
NOM
), in order to insure specified operation of overvoltage protection circuitry. Vout can be
increased up to 5% for Vin > 20V.
MCD10160 Rev.1.0, 01-Jun-10
Page 2 of 16
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SQ24T/S03150 DC-DC Converter Data Sheet
19-36 VDC Input; 15 VDC Output @ 3.3 A
Electrical Specifications (continued
)
Conditions: T
A
=25 ºC, Airflow=300 LFM (1.5 m/s), Vin=24 VDC, Vout=15 VDC unless otherwise specified.
PARAMETER
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
NOTES
3.3 ADC, 15 VDC Out @ 19 VDC In
Vin = 24 V, converter disabled
Vin = 24 V, converter enabled
25MHz bandwidth
120Hz
MIN
TYP
MAX
3.2
UNITS
ADC
mADC
mADC
mA
PK-PK
dB
VDC
mV
mV
VDC
mV
PK-PK
μF
ADC
ADC
A
Arms
mV
mV
µs
%
%
3
105
7
TBD
14.850
15.000
±4
±4
15.150
±10
±10
15.225
140
1000
3.3
4.5
15
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Over line, load and temperature
Full load + 10
μF
tantalum + 1
μF
ceramic
Plus full load (resistive)
Non-latching
Non-latching. Short=10mΩ
Non-latching
Co = 1
μF
ceramic
Co = 47
μF
tant. + 1
μF
ceramic
Co = 47
μF
tant. + 1
μF
ceramic
2
14.775
110
0
4
12
0.75
200
150
150
89
88
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/μS
di/dt = 5 A/μS
Setting Time to 1%
Load Change (25%-75%-25%), di/dt = 5 A/μS
EFFICIENCY
100% Load
50% Load
Additional Notes: 2. -40 ºC to 85 ºC.
MCD10160 Rev.1.0, 01-Jun-10
Page 3 of 16
www.power-one.com
SQ24T/S03150 DC-DC Converter Data Sheet
19-36 VDC Input; 15 VDC Output @ 3.3 A
Operation
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 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 100 µF
electrolytic capacitor with an ESR < 1
across the
input helps ensure stability of the converter. In many
applications, the user has to use decoupling
capacitance at the load. The power converter will
exhibit stable operation with external load
capacitance up to 1000 µF.
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 logic and
negative logic and both are referenced to Vin(-).
Typical connections are shown in Fig. A.
Vin (+)
sinking up to 1 mA depending on the signal polarity.
See the Start-up Information section for system
timing waveforms associated with use of the
ON/OFF pin.
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
regulation is required (see Fig. B).
Vin (+)
Semi
Q
Family
TM
Converter
Vout (+)
100
Rw
(Top View)
Vin
ON/OFF
SENSE (+)
TRIM
SENSE (-)
10
Rload
Vin (-)
Vout (-)
Rw
Fig. B:
Remote sense circuit configuration.
Semi
Q
Family
TM
Converter
Vout (+)
SENSE (+)
TRIM
SENSE (-)
Rload
(Top View)
Vin
ON/OFF
Vin (-)
CONTROL
INPUT
Vout (-)
If remote sensing is not required, 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 connections are not
made, the converter will deliver an output voltage
that is slightly higher than the specified value.
Because the sense leads carry minimal current,
large traces on the end-user board are not required.
However, sense traces should be located close to a
ground plane to minimize system noise and insure
optimum performance. When wiring discretely,
twisted pair wires should be used to connect the
sense lines to the load to reduce susceptibility to
noise.
The converter’s output over-voltage 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, equal to the
product of the nominal output voltage and the
allowable output current for the given conditions.
Fig. A:
Circuit configuration for ON/OFF function.
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
.
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 V
through a resistor. A 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 of
±20
V max.
may be connected directly to the ON/OFF input, in
which case it should be capable of sourcing or
MCD10160 Rev.1.0, 01-Jun-10
Page 4 of 16
www.power-one.com
SQ24T/S03150 DC-DC Converter Data Sheet
19-36 VDC Input; 15 VDC Output @ 3.3 A
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 (Pin 6)
The converter’s output voltage can be adjusted up
10% or down 20% relative to the rated output voltage
by the addition of an externally connected resistor.
Trim up to 10% is guaranteed only at Vin
≥
21 V, and
to 5% is guaranteed only at Vin
≥
20 V.
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, 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
5.11(100
Δ)V
O
NOM
626
10.22
[k]
1.225Δ
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
511
10.22
[k]
|
Δ
|
where,
R
T
DECR
½
Required value of trim-down resistor [k]
and
Δ
is as defined above.
Note: The above equations for
resistor values match those
conventional industry-standard,
one-eighth brick. For more
Application Note 103.
calculation of trim
typically used in
quarter-bricks and
information, see
Vin (+)
Semi
Q
Family
TM
Converter
Vout (+)
SENSE (+)
TRIM
SENSE (-)
R
T-DECR
Rload
(Top View)
Vin
ON/OFF
Vin (-)
Vout (-)
where,
R
T
INCR
½
Required value of trim-up resistor k]
V
O
NOM
½
Nominal value of output voltage [V]
Δ
½
(V
O-REQ
V
O -NOM
)
X 100
[%]
V
O -NOM
Fig. D:
Configuration for decreasing output voltage.
V
O
REQ
½
Desired (trimmed) output voltage [V].
Trimming/sensing beyond 110% of the rated output
voltage is not an acceptable design practice, as this
condition could cause unwanted triggering of the
output overvoltage protection (OVP) circuit. The
designer should ensure that the difference between
the voltages across the converter’s output pins and
its sense pins does not exceed 10%
of V
OUT
(
NOM
)
, or:
[V
OUT
)
V
OUT
)]
[V
SENSE
)
V
SENSE
)]
V
O - NOMX
10%
[V]
(
(
(
(
When trimming up, care must be taken not to exceed
the converter‘s maximum allowable output power.
See previous section for a complete discussion of
this requirement.
This equation is applicable for any condition of
output sensing and/or output trim.
Vin (+)
Semi
Q
Family
TM
Protection Features
Vout (+)
SENSE (+)
R
T-INCR
Converter
(Top View)
Vin
ON/OFF
Input Undervoltage Lockout
Rload
TRIM
SENSE (-)
Vin (-)
Vout (-)
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 at least 17.5 V for the
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops below 15 V. This feature is beneficial in
Fig. C:
Configuration for increasing output voltage.
MCD10160 Rev.1.0, 01-Jun-10
Page 5 of 16
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