QM48T25050-PAA0G [BEL]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT, QUARTER-BRICK, 8 PIN;
| 型号： | QM48T25050-PAA0G |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT, QUARTER-BRICK, 8 PIN |
| 文件： | 总13页 (文件大小：333K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
The QM Series of high current single output dc-dc
converters sets new standards for thermal performance
and power density in the quarter-brick package.
The QM48T/S25050 converters of the QM Series provide
thermal performance in high temperature environments
that is comparable to or exceeds the industry’s leading 5 V
half-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
impedance to system airflow, thus enhancing cooling for
both upstream and downstream devices. The use of 100%
automation for assembly, coupled with advanced electric
and thermal design, results in a product with extremely
high reliability.
Features
•
RoHS lead-free solder and lead-solder-exempted
products are available
Operating from a 36-75 V input, the QM Series converters
provide outputs that can be trimmed from –20% to +10%
of the nominal output voltage, thus providing outstanding
design flexibility.
•
•
•
•
•
•
•
•
Delivers up to 25 A @ 5.0 V
Industry-standard quarter brick pinout
On-board 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 surface-mount packages
Low profile: 0.28” [7.1 mm] SMT version,
0.31” [7.9 mm] TH version
Applications
•
•
•
•
•
•
•
Low weight: 1.1 oz [31.5 g] typical
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Fixed-frequency operation
Fully protected
Remote output sense
•
•
•
•
Telecommunications
Data communications
Wireless
Servers
Output voltage trim range: +10%/−20% with
industry-standard trim equations
•
High reliability: MTBF of 2.6 million hours,
calculated per Telcordia TR-332, Method I Case 1
Positive or negative logic ON/OFF option
UL60950 recognized in US and Canada and
DEMKO certified per IEC/EN60950
Meets conducted emissions requirements of FCC
Class B and EN 55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
•
•
•
•
V4.0 29-March-11
Page 1 of 13
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QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
Electrical Specifications (QM48T25050 and QM48S25050)
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
0
-40
-55
80
85
125
VDC
°C
°C
Operating Ambient Temperature
Storage Temperature
INPUT CHARACTERISTICS
Operating Input Voltage Range
36
33
31
48
34
32
75
35
33
100
3.9
VDC
VDC
VDC
VDC
ADC
mADC
mADC
mAPK-PK
dB
Input Under Voltage Lockout Turn-on Threshold
Input Under Voltage Lockout Turn-off Threshold
Input Voltage Transient
Maximum Input Current
Input Stand-by Current
Non-latching
100 ms
25 ADC, 5 VDC Out @ 36 VDC In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25 MHz bandwidth
2.65
52
12.5
TBD
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
120 Hz
OUTPUT CHARACTERISTICS
External Load Capacitance
Plus full load (resistive)
10,000
25
33
50
6.5
5.050
±5
±5
5.075
50
μF
ADC
ADC
A
Arms
VDC
mV
mV
VDC
mVPK-PK
Output Current Range
Current Limit Inception
0
Non-latching
Non-latching. Short = 10 mΩ.
Non-latching
26.25
30
31
Peak Short-Circuit Current
RMS Short-Circuit Current
Output Voltage Set Point (no load)
Output Regulation Over Line
Output Regulation Over Load
Output Voltage Range
4.950
4.925
5.000
±2
±2
Over line, load and temperature2
Full load + 10 μF tantalum + 1 μF ceramic
Output Ripple and Noise - 25 MHz bandwidth
30
1.4
340
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance
Isolation Resistance
2000
10
VDC
nF
MΩ
FEATURE CHARACTERISTICS
Switching Frequency
kHz
%
%
Output Voltage Trim Range1
Remote Sense Compensation1
Output Over-Voltage Protection
Auto-Restart Period
Industry-std. equations
Percent of VOUT(NOM)
Non-latching
-20
+10
+10
140
117
128
100
4
%
ms
ms
Applies to all protection features
Turn-On Time
ON/OFF Control (Positive Logic)
Converter Off
-20
2.4
0.8
20
VDC
VDC
Converter On
ON/OFF Control (Negative Logic)
Converter Off
2.4
-20
20
0.8
VDC
VDC
Converter On
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 1 A/μs
Co = 470 μF tantalum + 1 μF ceramic
120
40
mV
µs
Setting Time to 1%
EFFICIENCY
100% Load
89.5
90.5
%
%
50% Load
Notes: 1. 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.
2. -40ºC to 85ºC
V4.0 29-March-11
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QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
the Start-up Information section for system timing
waveforms associated with use of the ON/OFF pin.
Operation
Remote Sense (Pins 5 and 7)
Input and Output Impedance
The remote sense feature of the converter compensates
These power converters have been designed to be stable
with no external capacitors when used in low inductance
input and output circuits.
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).
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 33 µF electrolytic capacitor with an ESR <
1 Ω 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
2,200 µF on 5 V output.
TM Series
Rw
QmaX
Vout (+)
100
Vin (+)
ON/OFF
Vin (-)
Converter
SENSE (+)
(Top View)
Rload
TRIM
Vin
SENSE (-)
10
Vout (-)
Rw
ON/OFF (Pin 2)
Fig. B: Remote sense circuit configuration.
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.
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.
TM Series
QmaX
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
(Top View)
Rload
Vin
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 ensure optimum performance.
When wiring discretely, twisted pair wires should be used
to connect the sense lines to the load to reduce
susceptibility to noise.
SENSE (-)
Vout (-)
CONTROL
INPUT
Fig. A: Circuit configuration for ON/OFF function.
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.
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.
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.
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
sinking up to 1 mA depending on the signal polarity. See
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
MAR 27, 2003 revised to SEP 28, 2006
Page 3 of 13
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QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
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.
511
RT−DECR
=
− 10.22 [kΩ]
| Δ |
where,
Output Voltage Adjust /TRIM (Pin 6)
R
T−DECR
=
Required value of trim-down resistor [kΩ]
and Δ is as defined above.
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.
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter-bricks. More information can be found in
Output Voltage Trim Feature Application Note.
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.
TM Series
QmaX
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
(Top View)
To increase the output voltage, refer to Fig. C. A trim
resistor, RT-INCR, should be connected between the TRIM
(Pin 6) and SENSE(+) (Pin 7), with a value of:
Rload
Vin
RT-DECR
SENSE (-)
Vout (-)
5.11(100 + Δ)VO−NOM − 626
RT−INCR
=
− 10.22 [kΩ]
1.225Δ
Fig. D: Configuration for decreasing output voltage.
where,
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
0.50 V, or:
R
T−INCR
O−NOM
=
=
Required value of trim-up resistor kΩ]
Nominal value of output voltage [V]
V
(VO-REQ − VO-NOM
)
Δ =
X 100 [%]
V
O -NOM
[VOUT(+) − VOUT(−)]− [VSENSE(+) − VSENSE(−)] ≤ 0.50 [V]
VO−REQ
=
Desired (trimmed) output voltage [V].
This equation is applicable for any condition of output
sensing and/or output trim.
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.
QmaXTM Series
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
(Top View)
R T-INCR
Rload
Vin
SENSE (-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
To decrease the output voltage (Fig. D), a trim resistor,
T-DECR, should be connected between the TRIM (Pin 6)
R
and SENSE(-) (Pin 5), with a value of:
MAR 27, 2003 revised to SEP 28, 2006
Page 4 of 13
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QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
To comply with safety agencies’ requirements, an input
line fuse must be used external to the converter. A fuse
with rating of 7A is recommended for use with this product.
Protection Features
Input Undervoltage Lockout
Electromagnetic Compatibility (EMC)
Input undervoltage lockout is standard with this converter.
The converter will shut down when the input voltage drops
below a pre-determined voltage.
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 their
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.
The input voltage must be at least 35 V for the converter to
turn on. Once the converter has been turned on, it will shut
off when the input voltage drops below 31 V. This feature
is beneficial in preventing deep discharging of batteries
used in telecom applications.
Output Overcurrent Protection (OCP)
Effective internal LC differential filter significantly reduces
input reflected ripple current, and improves EMC.
The converter is protected against overcurrent or short-
circuit conditions. Upon sensing an overcurrent condition,
the converter will switch to constant current operation and
thereby begin to reduce output voltage. When the output
voltage drops below 60% of the nominal value of output
voltage, the converter will shut down.
With the addition of a simple external filter, all versions of
the QM Series of converters pass the requirements of
Class B conducted emissions per EN55022 and FCC, and
meet at a minimum, Class A radiated emissions per EN
55022 and Class B per FCC Title 47CFR, Part 15-J.
Please contact Power-One Applications Engineering for
details of this testing.
Once the converter has shut down, it will attempt to restart
nominally every 100 ms with a typical 3% duty cycle. The
attempted restart will continue indefinitely until the
overload or short circuit conditions are removed or the
output voltage rises above 60% of its nominal value.
Output Overvoltage Protection (OVP)
The converter will shut down if the output voltage across
Vout(+) (Pin 8) and Vout(-) (Pin 4) 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 100 ms until the OVP condition is removed.
Overtemperature Protection (OTP)
Fig. H: Location of the thermocouple for thermal testing.
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 such as system fan failure. After
the converter has cooled to a safe operating temperature,
it will automatically restart.
Safety Requirements
The converters meet North American and International
safety regulatory requirements per UL60950 and
EN60950. Basic Insulation is provided between input and
output.
MAR 27, 2003 revised to SEP 28, 2006
Page 5 of 13
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QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
For each set of conditions, the maximum load current was
defined as the lowest of:
Characterization
General Information
(i) The output current at which either any FET junction
temperature did not exceed
a maximum specified
temperature (120°C) as indicated by the thermographic
image, or
The converter has been characterized for many
operational aspects, to include thermal derating (maximum
load current as a function of ambient temperature and
airflow) for vertical and horizontal mounting, efficiency,
start-up and shutdown parameters, output ripple and
noise, transient response to load step-change, overload,
and short circuit.
(ii) The nominal rating of the converter (25 A)
During normal operation, derating curves with maximum
FET temperature less than or equal to 120 °C should not
be exceeded. Temperature on the PCB at the
thermocouple location shown in Fig. H should not exceed
118 °C in order to operate inside the derating curves.
The following pages contain specific plots or waveforms
associated with the converter. Additional comments for
specific data are provided below.
Efficiency
Test Conditions
Fig.5 shows the efficiency vs. load current plot for ambient
temperature of 25 ºC, airflow rate of 300 LFM (1.5 m/s)
with vertical mounting and input voltages of 36 V, 48 V and
72 V. Also, a plot of efficiency vs. load current, as a
function of ambient temperature with Vin = 48 V, airflow
rate of 200 LFM (1 m/s) with vertical mounting is shown in
Fig. 6.
All data presented were taken with the converter soldered
to a test board, specifically a 0.060” thick printed wiring
board (PWB) with four layers. The top and bottom layers
were not metalized. The two inner layers, comprising two-
ounce copper, were used to provide traces for connectivity
to the converter.
The lack of metalization on the outer layers as well as the
limited thermal connection ensured that heat transfer from
the converter to the PWB was minimized. This provides a
worst-case but consistent scenario for thermal derating
purposes.
Power Dissipation
Fig. 7 shows the power dissipation vs. load current plot for
Ta = 25ºC, airflow rate of 300 LFM (1.5 m/s) with vertical
mounting and input voltages of 36 V, 48 V and 72 V. Also,
a plot of power dissipation vs. load current, as a function of
ambient temperature with Vin = 48 V, airflow rate of 200
LFM (1 m/s) with vertical mounting is shown in Fig. 8.
All measurements requiring airflow were made in vertical
and horizontal wind tunnel facilities using Infrared (IR)
thermography and thermocouples for thermometry.
Start-up
Ensuring components on the converter do not exceed their
ratings is important to maintaining high reliability. If one
anticipates operating the converter at or close to the
maximum loads specified in the derating curves, it is
prudent to check actual operating temperatures in the
application. Thermographic imaging is preferable; if this
capability is not available, then thermocouples may be
used. Power-One recommends the use of AWG #40
gauge thermocouples to ensure measurement accuracy.
Careful routing of the thermocouple leads will further
minimize measurement error. Refer to Figure H for
optimum measuring thermocouple location.
Output voltage waveforms, during the turn-on transient
using the ON/OFF pin for full rated load currents (resistive
load) are shown without and with external load
capacitance in Fig. 9 and Fig. 10, respectively.
Ripple and Noise
Figure 12 shows the output voltage ripple waveform,
measured at full rated load current with a 10 µF tantalum
and 1 µF ceramic capacitor across the output. Note that all
output voltage waveforms are measured across a 1 µF
ceramic capacitor.
Thermal Derating
The input reflected ripple current waveforms are obtained
using the test setup shown in Fig 13. The corresponding
waveforms are shown in Figs. 14 and 15.
Load current vs. ambient temperature and airflow rates are
given in Figs. 1-4 for vertical and horizontal converter
mounting both through-hole and surface mount version.
Ambient temperature was varied between 25°C and 85°C,
with airflow rates from 30 to 500 LFM (0.15 to 2.5 m/s).
MAR 27, 2003 revised to SEP 28, 2006
Page 6 of 13
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QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
Start-up Information (using negative ON/OFF)
VIN
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of
VIN. See Figure E.
ON/OFF
STATE
Time
Comments
OFF
ON
t0
ON/OFF pin is ON; system front end power is toggled
on, VIN to converter begins to rise.
VIN crosses Under-Voltage Lockout protection circuit
threshold; converter enabled.
Converter begins to respond to turn-on command
(converter turn-on delay).
Converter VOUT reaches 100% of nominal value.
t1
t2
t3
VOUT
For this example, the total converter start-up time (t3- t1) is
typically 4 ms.
t
t
0
t
1
t
2
t3
Fig. E: Start-up scenario #1.
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure F.
VIN
Time
t0
t1
Comments
VINPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
ON/OFF
STATE
t2
t3
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
OFF
ON
For this example, the total converter start-up time (t3- t1) is
typically 4 ms.
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously powered, converter is disabled and then
enabled via ON/OFF pin. See Figure G.
V
OUT
Time
Comments
t0
t1
VIN and VOUT are at nominal values; ON/OFF pin ON.
ON/OFF pin arbitrarily disabled; converter output falls
to zero; turn-on inhibit delay period (100 ms typical) is
initiated, and ON/OFF pin action is internally inhibited.
ON/OFF pin is externally re-enabled.
t
t
0
t
1
t
2
t3
Fig. F: Start-up scenario #2.
t2
VIN
If (t2- t1) ≤ 100 ms, external action of ON/OFF pin
is locked out by start-up inhibit timer.
If (t2- t1) > 100 ms, ON/OFF pin action is
internally enabled.
Turn-on inhibit delay period ends. If ON/OFF pin is
ON, converter begins turn-on; if off, converter awaits
ON/OFF pin ON signal; see Figure F.
100 ms
t3
ON/OFF
STATE
OFF
t4
t5
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
ON
V
OUT
For the condition, (t2- t1) ≤ 100 ms, the total converter start-up
time (t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, start-up will
be typically 4 ms after release of ON/OFF pin.
t
t
0
t
1
t
2
t
3
t
4
t5
Fig. G: Start-up scenario #3.
MAR 27, 2003 revised to SEP 28, 2006
Page 7 of 13
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QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
30
25
20
15
10
5
30
25
20
15
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
10
5
0
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 1: Available load current vs. ambient air temperature and
airflow rates for QM48T25050 converter with B height pins
mounted vertically with air flowing from pin 3 to pin 1, MOSFET
temperature ≤ 120°C, Vin = 48 V.
Fig. 2: Available load current vs. ambient air temperature and
airflow rates for QM48T25050 converter with B height pins
mounted horizontally with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
30
25
20
15
30
25
20
15
500 LFM (2.5 m/s)
400 LFM (2.0 m
500 LFM (2.5 m
400 LFM (2.0 m
10
5
300 LFM (1.5 m/
200 LFM (m/s)
100 LFM (0m/s)
30 LFM (0.15 m/s)
10
5
300 LFM (1.5 m/s
200 M (m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
0
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 3: Available load current vs. ambient temperature and airflow
rates for QM48S25050 converter mounted vertically with Vin = 48
V, air flowing from pin 3 to pin 1 and maximum FET temperature
≤ 120°C.
Fig. 4: Available load current vs. ambient temperature and airflow
rates for QM48S25050 converter mounted horizontally with Vin =
48 V, air flowing from pin 3 to pin 1 and maximum FET
temperature ≤ 120°C.
V4.0 29-March-11
Page 8 of 13
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QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
0.90
0.85
0.80
72 V
48 V
36 V
70 C
55 C
40 C
0.75
0.70
0.65
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Load Current [Adc]
Load Current [Adc]
Fig. 5: Efficiency vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to pin 1
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 6: Efficiency vs. load current and ambient temperature for
converter mounted vertically with Vin = 48 V and air flowing
from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
20.00
16.00
12.00
8.00
20.00
16.00
12.00
8.00
72 V
48 V
70 C
55 C
36 V
40 C
4.00
4.00
0.00
0.00
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Load Current [Adc]
Load Current [Adc]
Fig. 7: Power dissipation vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to pin 1
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 8: Power dissipation vs. load current and ambient
temperature for converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0
m/s).
MAR 27, 2003 revised to SEP 28, 2006
Page 9 of 13
www.power-one.com
QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
Fig. 10: Turn-on transient at full rated load current (resistive)
plus 10,000 µF at Vin = 48 V, triggered via ON/OFF pin. Top
trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage
(2 V/div.). Time scale: 2 ms/div.
Fig. 9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48 V, triggered via ON/OFF
pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: output
voltage (2 V/div.) Time scale: 2 ms/div.
Fig. 12: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 µF tantalum + 1uF
ceramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 11: Output voltage response to load current step-change
(12.5 A – 18.75 A – 12.5 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (5 A/div).
Current slew rate: 1 A/µs. Co = 470 µF tantalum + 1 µF
ceramic. Time scale: 0.2 ms/div.
MAR 27, 2003 revised to SEP 28, 2006
Page 10 of 13
www.power-one.com
QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
iS
iC
10 µH
source
inductance
TM Series
33 µF
ESR <1
electrolytic
capacitor
1 µF
ceramic
capacitor
QmaX
Ω
DC/DC
Converter
Vout
Vsource
Fig. 13: Test setup for measuring input reflected ripple currents, ic and is.
Fig. 14: Input reflected ripple current, is (10 mA/div), measured
through 10 µH at the source at full rated load current and Vin =
48 V. Refer to Fig. 13 for test setup. Time scale: 1µs/div.
Fig. 15: Input reflected ripple current, ic (200 mA/div),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 13 for test setup. Time scale: 1 µs/div.
6.0
5.0
4.0
3.0
2.0
1.0
0
10
20
30
40
0
Iout [Adc]
Fig. 17: Load current (top trace, 20 A/div, 20 ms/div) into a 10
mΩ short circuit during restart, at Vin = 48 V. Bottom trace (20
A/div, 1 ms/div) is an expansion of the on-time portion of the
top trace.
Fig. 16: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost
no effect on current limit characteristic.
V4.0 29-March-11
Page 11 of 13
www.power-one.com
QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
Physical Information
QM48S Platform Notes
•
•
•
•
•
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Gold over Nickel
Converter Weight: 1.1oz [31.5 g]
Recommended Surface-Mount Pads:
Min. 0.080” X 0.112” [2.03 x 2.84]
Max. 0.092” X 0.124” [2.34 x 3.15]
1
2
3
8
7
6
5
4
TOP VIEW
SIDE VIEW
Pin Connections
Pin #
Function
1
2
3
4
5
6
7
8
Vin (+)
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
QM48S (Surface Mount)
SENSE(+)
Vout (+)
QM48T Platform Notes
1
8
7
6
5
4
•
•
All dimensions are in inches [mm]
Pins 1-3 and 5-7 are Ø 0.040” [1.02]
with Ø 0.078” [1.98] shoulder
Pins 4 and 8 are Ø 0.062” [1.57]
without shoulder
2
TOP VIEW
3
•
•
•
Pin Material: Brass
Pin Finish: Tin/Lead over Nickel or
Matte Tin over Nickel for “G” version
Converter Weight: 1.1 oz [31.5 g] typical
SIDE VIEW
•
QM48T (Through-hole)
HT
CL
PL
(Max. Height)
(Min. Clearance)
Pin Length
Height
Option
Pin
Option
+0.000 [+0.00]
-0.038 [- 0.97]
+0.016 [+0.41]
-0.000 [- 0.00]
±0.005 [±0.13]
A
B
D
0.325 [8.26]
0.358 [9.09]
0.422 [10.72]
0.030 [0.77]
0.063 [1.60]
0.127 [3.23]
A
B
C
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
V4.0 29-March-11
Page 12 of 13
www.power-one.com
QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
Converter Part Numbering/Ordering Information
Pin
Length
[PL]
Product
Series
Input
Voltage
Mounting
Scheme
Rated Load
Current
Output
Voltage
ON/OFF
Logic
Maximum
Height [HT]
Special
Features
RoHS
QM
48
T
25
050
-
N
B
A
0
SMT
S ⇒ 0.295”
SMT
0 ⇒ 0.00”
No Suffix ⇒
RoHS
lead-solder-
exemption
compliant
S ⇒
Surface
Mount
N ⇒
Negative
1/4th
Brick
Through
hole
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
36-75 V
25 ADC
050 ⇒ 5.0 V
0 ⇒ STD
Through hole
A ⇒ 0.325”
B ⇒ 0.358”
D ⇒ 0.422”
Format
T⇒
Through-
hole
P ⇒
Positive
G ⇒ RoHS
compliant
for all six
substances
The example above describes P/N QM48T25050-NBA0: 36-75 V input, through-hole, 25 A @ 5 V output, negative ON/OFF logic, a maximum height
of 0.358”, a through the board pin length of 0.188”, and RoHS lead-solder-exemption compliancy. Please consult factory regarding availability of a
specific version.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical components
in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective
divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date
manufactured. Specifications are subject to change without notice.
MAR 27, 2003 revised to SEP 28, 2006
Page 13 of 13
www.power-one.com
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