ASQ48T15033-PBC0 [BEL]
DC-DC Regulated Power Supply Module, 1 Output, 49.5W, Hybrid, ONE-EIGHTH BRICK PACKAGE-8;
| 型号： | ASQ48T15033-PBC0 |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, 49.5W, Hybrid, ONE-EIGHTH BRICK PACKAGE-8 |
| 文件： | 总15页 (文件大小：267K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
Description
The ASQ48 Series DC-DC converters are ideally suited for
aerospace applications where high-reliability, low profile, and
low weight are critical. They are designed for reliable opera-
tion in harsh thermal and mechanical environments.
In high-ambient temperature applications the ASQ48 Series
15A converters provide thermal performance that exceeds
most competing DC-DC converters that have a higher
nominal rating and much larger package size. This is
accomplished using patent pending circuit, packaging, and
processing techniques to achieve ultra-high efficiency,
excellent thermal management and a very low body profile.
Coupled with Power-One’s use of 100% automation for
assembly; this results in a product with extremely high
quality and reliability.
ASQ48T15033 and ASQ48S15033 Converters
Features
RoHS lead solder exemption compliant
Delivers up to 15 A (50 W)
Operates from - 55 C to 85 C ambient
Available in both through-hole and surface mount packages,
the ASQ48 Series converters are also ideal for environ-
ments with little or no airflow.
Survives 1000 g mechanical shock, MIL-STD-883E
High reliability: MTBF 3.4 million hours, calculated per
Telcordia TR-332, Method I Case 1
20
15
10
Available in through-hole and SM packages
Low weight: 0.53 oz (15 g)
Low profile: 0.26” (6.6 mm)
Extremely small footprint: 0.896” x 2.30” (2.06 in2)
High efficiency – no heat sink required
On-board input differential LC-filter
Extremely low output and input ripple
Start-up into pre-biased output
No minimum load required
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)
5
30 LFM (0.15 m/s)
2,000 VDC I/O Isolation
0
Meets Basic Insulation requirements of EN60950
Meets input voltage transient of 100 V for 100 ms
Does not use opto-isolators
Fixed-frequency operation
Fully protected
Remote output sense
Output voltage trim range: +10%/-20%
Positive or negative logic ON/OFF option
UL 60950-1/CSA 22.2 No. 60950-1-07 Second Edition,
IEC 60950-1: 2005, and EN 60950-1:2006
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 1: Available load current vs. ambient air temperature and air-
flow rates for ASQ48T15033 converter with D height pins mounted
vertically with air flowing from pin 3 to pin 1, MOSFET temperature
120 C, Vin = 48 V.
Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
MCD10170 Rev. 1.0, 10-Jun-10
Page 1 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
Electrical Specifications
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
Operating Ambient Temperature
Storage Temperature
Continuous
0
-55
-55
80
85
125
VDC
°C
°C
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
Turn-off Threshold
Input Voltage Transient
36
48
75
VDC
Non-latching
100 ms
33
31
34
32
35
33
100
VDC
VDC
VDC
OUTPUT CHARACTERISTICS
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Plus full load (resistive)
15,000
15
20
40
5.3
μF
ADC
ADC
A
0
16.5
16.5
Non-latching
Non-latching. Short=10mΩ.
Non-latching
18
30
Arms
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance
2000
10
VDC
ρF
Mꢀ
160
415
Isolation Resistance
FEATURE CHARACTERISTICS
Switching Frequency
kHz
%
%
Output Voltage Trim Range1
Remote Sense Compensation1
Output Over-Voltage Protection
Over-Temperature Shutdown (PCB)
Auto-Restart Period
Use trim equations on Page 7
Percent of VOUT(NOM)
-20
+10
+10
127
Non-latching
Non-latching
Applies to all protection features
From ENABLE to 95% of VOUT(NOM)
117
122
125
100
4
%
°C
ms
ms
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
Additional 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. See further discussion at end of
Output Voltage Adjust /TRIM section.
MCD10170 Rev. 1.0, 10-Jun-10
Page 2 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
Electrical Specifications (continued)
Conditions: TA=25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
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
15 ADC, 3.3 VDC Out @ 36 VDC In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
See Figure 24 - 25MHz bandwidth
120Hz
1.6
ADC
mADC
mADC
mAPK-PK
dB
3
45
7.5
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
3.267
3.250
3.300
3.333
VDC
Over Line
Over Load
±2
±2
±5
±5
3.350
50
mV
mV
VDC
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
Over line, load and temperature2
Full load + 10 μF tantalum + 1 μF ceramic
30
mVPK-PK
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/μS
di/dt = 5 A/μS
Co = 1 μF ceramic (Fig.19)
Co = 450 μF tant. + 1 μF ceramic (Fig.20)
90
100
100
mV
mV
µs
Setting Time to 1%
EFFICIENCY
100% Load
50% Load
88.5
89
%
%
Additional Notes:
2. -55 ºC to 85 ºC
MCD10170 Rev. 1.0, 10-Jun-10
Page 3 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
Physical Information (Through-Hole)
Pin Connections
Function
1
2
3
8
7
6
5
4
Pin #
1
2
3
4
5
6
7
8
Vin (+)
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
TOP VIEW
SIDE VIEW
SENSE(+)
Vout (+)
All dimensions are in inches [mm]
Pins 1-3 and 5-3.5 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
Pin Material: Brass
Pin Finish: Tin/Lead over Nickel
Converter Weight: 0.53 oz [15 g]
HT
CL
PL
(Maximum Height)
(Minimum Clearance)
(Pin Length)
Height
Option
Pin
Option
+0.000 [+0.00]
-0.038 [-0.97]
0.303 [7.69]
0.336 [8.53]
0.500 [12.70]
0.400 [10.16]
0.282 [7.16]
+0.016 [+0.41]
-0.000 [-0.00]
0.030 [0.77]
0.063 [1.60]
0.227 [5.77]
0.127 [3.23]
0.009 [0.23]
±0.005 [±0.13]
A
B
C
D
E
A
B
C
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
Converter Part Numbering Scheme
Rated
Load
Current
Product
Series
Input
Voltage
Mounting
Scheme
Output
Voltage
ON/OFF Log-
Maximum
Height (HT)
Pin
Length (PL)
Special
Features
ic
48
T
15
033
-
N
A
0
ASQ
B
A 0.303”
B 0.336”
C 0.500”
D 0.400”
E 0.282”
A 0.188”
B 0.145”
C 0.110”
One-Eighth
Brick
Format
Through-
hole
N Negative
P Positive
36-75 V
15 ADC
033 3.3 V
0 STD
The example above describes P/N ASQ48T15033-NBA0: 36-75 V input, through-hole mounting, 15 A @ 3.3 V output, negative ON/OFF logic, a
maximum height of 0.336”, and a through the board pin length of 188”. Please consult factory regarding availability of a specific version.
Model numbers highlighted in yellow or shaded are not recommended for new designs.
MCD10170 Rev. 1.0, 10-Jun-10
Page 4 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
Physical Information (Surface Mount)
Pin Connections
Function
1
2
3
8
7
6
5
4
Pin #
1
2
3
4
5
6
7
8
Vin (+)
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
TOP VIEW
SIDE VIEW
SENSE(+)
Vout (+)
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Tin/Lead over Nickel
Optional: Gold over Nickel
Converter Weight: 0.53 oz [15 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]
Converter Part Numbering Scheme
Rated
Load
Current
Product
Series
Input
Voltage
Mounting
Scheme
Output
Voltage
ON/OFF Log-
ic
Maximum
Height
Pin
Length
Special
Features
48
S
15
033
-
N
0
0
ASQ
S
One-Eighth
Brick
Format
Surface
Mount
N Negative
P Positive
36-75 V
15 ADC
033 3.3 V
S 0.273”
0 0.00”
0 STD
The example above describes P/N ASQ48S15033-NS00: 36-75 V input, surface mounting, 15 A @ 3.3 V output, negative ON/OFF logic. Please
consult factory regarding availability of a specific version.
Model numbers highlighted in yellow or shaded are not recommended for new designs.
MCD10170 Rev. 1.0, 10-Jun-10
Page 5 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
which case it must be capable of sourcing or sinking (de-
pending on the signal polarity) up to 1 mA. See the Start-up
Information section for system timing waveforms associated
Operation
Input and Output Impedance
with use of the ON/OFF pin.
These power converters have been designed to be stable
with no external capacitors when used in low inductance in-
put and output circuits.
Remote Sense (Pins 5 and 7)
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 addi-
tion of a 33 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 capacit-
ance at the load. The power converter will exhibit stable
operation with external load capacitance up to 15,000 µF.
The remote sense feature of the converter compensates for
voltage drops occurring between the output pins of the con-
verter 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. 3).
TM
Rw
Family
Q
Semi
Vout (+)
100
Vin (+)
ON/OFF
Vin (-)
Converter
SENSE (+)
(Top View)
ON/OFF (Pin 2)
Rload
TRIM
Vin
SENSE (-)
10
The ON/OFF pin is used to turn the power converter on or
off remotely via a system signal. There are two remote con-
trol options available, positive logic and negative logic and
both are referenced to Vin(-). Typical connections are shown
in Fig. 2.
Vout (-)
Rw
Fig. 3: Remote sense circuit configuration.
TM
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.
Family
Q
Semi
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
(Top View)
Rload
Vin
SENSE (-)
Vout (-)
CONTROL
INPUT
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.
Fig. 2: Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF pin is
at a logic high and turns off when at a logic low. The conver-
ter is on when the ON/OFF pin is left open.
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.
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.
When utilizing the remote sense feature, care must be taken
not to exceed the maximum allowable output power capabili-
ty of the converter, equal to the product of the nominal out-
put 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 vol-
tage of 0.8 V. An external voltage source (±20 V maxi-
mum) may be connected directly to the ON/OFF input, in
When using remote sense, the output voltage at the conver-
ter can be increased by as much as 10% above the nominal
MCD10170 Rev. 1.0, 10-Jun-10
Page 6 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
rating in order to maintain the required voltage across the
and Δ is as defined above.
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 al-
lowable output power.
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter and one-eighth bricks. For more informa-
tion see Application Note 103.
Output Voltage Adjust /TRIM (Pin 6)
TM
Family
Q
Semi
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
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 guar-
anteed only at Vin ≥ 40 V, and it is marginal (8% to 10%) at
Vin = 36 V.
(Top View)
R T-INCR
Rload
Vin
SENSE (-)
Vout (-)
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 µF capacitor is con-
nected internally between the TRIM and SENSE(-) pins.
Fig. 4: Configuration for increasing output voltage.
To increase the output voltage, refer to Fig. 4. A trim resistor,
R
T-INCR, should be connected between the TRIM (Pin 6) and
SENSE(+) (Pin 7), with a value of:
TM
Family
Q
Semi
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
(Top View)
Rload
5.11(100 Δ)VONOM 626
Vin
RTINCR
10.22 [k]
RT-DECR
SENSE (-)
Vout (-)
1.225Δ
where,
RTINCR Required value of trim-up resistor k]
VONOM Nominal value of output voltage [V]
Fig. 5: Configuration for decreasing output voltage.
(VO-REQ VO-NOM)
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 over-voltage protec-
tion (OVP) circuit. The designer should ensure that the dif-
ference between the voltages across the converter’s output
pins and its sense pins does not exceed 0.33 V, or:
Δ
X 100 [%]
VO -NOM
VOREQ Desired (trimmed) output voltage [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.
[VOUT() VOUT()][VSENSE() VSENSE()] 0.33 [V]
To decrease the output voltage (Fig. 5), a trim resistor,
RT-DECR, should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
This equation is applicable for any condition of output sens-
ing and/or output trim.
511
RTDECR
10.22 [k]
| Δ |
where,
RTDECR Required value of trim-down resistor [k]
MCD10170 Rev. 1.0, 10-Jun-10
Page 7 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
Safety Requirements
Protection Features
Input Undervoltage Lockout
The converters meet North American and International
safety regulatory requirements per UL 60950-1/CSA 22.2
No. 60950-1-07 Second Edition, IEC 60950-1: 2005, and
EN 60950-1:2006. Basic Insulation is provided between
input and output.
Input undervoltage lockout is standard with this converter.
The converter will shut down when the input voltage drops
below a pre-determined voltage.
To comply with safety agencies requirements, an input line
fuse must be used external to the converter. A 4-A fuse is
recommended for use with this product.
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.
If one input fuse is used for a group of modules, the maxi-
mum fuse rating should not exceed 15-A (ASQ modules are
UL approved with up to a 15-A fuse).
Output Overcurrent Protection (OCP)
Electromagnetic Compatibility (EMC)
The converter is protected against overcurrent or short cir-
cuit conditions. Upon sensing an overcurrent condition, the
converter will switch to constant current operation and there-
by begin to reduce output voltage. When the output voltage
drops below 1.2 VDC, the converter will shut down (Fig. 25).
EMC requirements must be met at the end-product system
level, as no specific standards dedicated to EMC characte-
ristics of board mounted component dc-dc converters exist.
However, di/dt tests its converters to several system level
standards, primary of which is the more stringent EN55022,
Information technology equipment - Radio disturbance cha-
racteristics - Limits and methods of measurement.
Once the converter has shut down, it will attempt to restart
nominally every 100 ms with a 1% duty cycle (Fig 26). The
attempted restart will continue indefinitely until the overload
or short circuit conditions are removed or the output voltage
rises above 1.2 VDC.
With the addition of a simple external filter (see application
notes), the ASQ48T/S15 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 di/dt Applications Engineering for details of this test-
ing.
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 refer-
ence, 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)
The converter will shut down under an overtemperature con-
dition to protect itself from overheating caused by operation
outside the thermal derating curves, or operation in abnor-
mal conditions such as system fan failure. After the conver-
ter has cooled to a safe operating temperature, it will auto-
matically restart.
MCD10170 Rev. 1.0, 10-Jun-10
Page 8 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
For each set of conditions, the maximum load current was
defined as the lowest of:
Characterization
General Information
(i) The output current at which any FET junction temperature
does 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 (15 A).
During normal operation, derating curves with maximum FET
temperature less or equal to 120°C should not be exceeded.
Temperature on the PCB at the thermocouple location
shown in Fig. 27 should not exceed 118°C in order to oper-
ate inside the derating curves.
The following pages contain specific plots or waveforms as-
sociated with the converter. Additional comments for specific
data are provided below.
Efficiency
Test Conditions
Figure 13 shows the efficiency vs. load current plot for am-
bient temperature of 25 ºC, airflow rate of 300 LFM (1.5 m/s)
with converter mounted vertically, 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 converter mounted vertically is
shown in Fig. 14.
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 cop-
per, were used to provide traces for connectivity to the con-
verter.
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 pur-
poses.
Power Dissipation
Power dissipation vs. load current plot is shown in Fig. 15 for
ambient temperature of 25 ºC, airflow rate of 300 LFM (1.5
m/s) with converter mounted vertically, 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) is shown for a vertically
mounted converter in Fig. 16
All measurements requiring airflow were made in di/dt’s ver-
tical and horizontal wind tunnel facilities using Infrared (IR)
thermography and thermocouples for thermometry.
Ensuring components on the converter do not exceed their
ratings is important to maintaining high reliability. If one an-
ticipates 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. Thermo-
graphic imaging is preferable; if this capability is not availa-
ble, then thermocouples may be used. di/dt recommends the
use of AWG #40 gauge thermocouples to ensure measure-
ment accuracy. Careful routing of the thermocouple leads
will further minimize measurement error. Refer to Figure 27
for optimum measuring thermocouple location.
Start-up
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 10,000 F load capacitance in
Figs. 17 and 18, respectively.
Ripple and Noise
Figure 21 shows the output voltage ripple waveform, meas-
ured at full rated load current with a 10 µF tantalum and 1 µF
ceramic capacitor across the output. Note that all output vol-
tage waveforms are measured across a 1 F ceramic capa-
citor.
Thermal Derating
Load current vs. ambient temperature and airflow rates are
given in Figs. 9-12 for through-hole and surface mount ver-
sion. 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), and vertical and horizontal converter mounting.
The input reflected ripple current waveforms are obtained
using the test setup shown in Fig 22. The corresponding
waveforms are shown in Figs. 23 and 24.
MCD10170 Rev. 1.0, 10-Jun-10
Page 9 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
VIN
Start-up Information (using negative ON/OFF)
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure 6.
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
t0
t1 t2
t3
VIN
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure 7.
Time
t0
t1
Comments
VINPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
ON/OFF
STATE
OFF
ON
t2
t3
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
For this example, the total converter start-up time (t3- t1) is typically
4 ms.
VOUT
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 8.
t
t0
t1 t2
t3
Time
Comments
Fig. 7: Start-up scenario #2.
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.
VIN
t2
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.
100 ms
ON/OFF
STATE
OFF
ON
t3
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 7.
VOUT
t4
t5
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
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
t0
t1
t2
t3 t4
t5
Fig. 8: Start-up scenario #3.
Fig. 6: Start-up scenario #1.
MCD10170 Rev. 1.0, 10-Jun-10
Page 10 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
20
15
10
5
20
15
10
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)
5
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. 9: Available load current vs. ambient air temperature and
airflow rates for ASQ48T15033 converter with D height pins
mounted vertically with Vin = 48 V, air flowing from pin 3 to pin
1 and maximum FET temperature 120C.
Fig. 10: Available load current vs. ambient air temperature and
airflow rates for ASQ48T15033 converter with D height pins
mounted horizontally with Vin = 48 V, air flowing from pin 3 to
pin 1 and maximum FET temperature 120C.
20
15
10
20
15
10
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 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)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
5
5
30 LFM (0.15 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. 11: Available load current vs. ambient temperature and
airflow rates for ASQ48S15033 converter mounted vertically
with Vin = 48 V, air flowing from pin 3 to pin 1 and maximum
FET temperature 120C.
Fig. 12: Available load current vs. ambient temperature and
airflow rates for ASQ48S15033 converter mounted horizontally
with Vin = 48 V, air flowing from pin 3 to pin 1 and maximum
FET temperature 120C.
MCD10170 Rev. 1.0, 10-Jun-10
Page 11 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
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
2
4
6
8
10
12
14
16
0
2
4
6
8
10
12
14
16
Load Current [Adc]
Load Current [Adc]
Fig. 13: Efficiency vs. load current and input voltage for con-
verter mounted vertically with air flowing from pin 3 to pin 1 at a
rate of 300 LFM (1.5 m/s) and Ta = 25C.
Fig. 14: 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).
8.00
6.00
4.00
8.00
6.00
4.00
72 V
48 V
36 V
70 C
55 C
40 C
2.00
2.00
0.00
0.00
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10
12
14
16
Load Current [Adc]
Load Current [Adc]
Fig. 15: 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 = 25C.
Fig. 16: Power dissipation vs. load current and ambient tem-
perature 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).
MCD10170 Rev. 1.0, 10-Jun-10
Page 12 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
Fig. 17: Turn-on transient at full rated load current (resistive)
Fig. 18: Turn-on transient at full rated load current (resistive)
plus 10,000 F at Vin = 48 V, triggered via ON/OFF pin. Top
trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage
(1 V/div.). Time scale: 2 ms/div.
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 (1 V/div.) Time scale: 2 ms/div.
Fig. 19: Output voltage response to load current step-change
(3.75 A – 7.5 A – 3.75 A) at Vin = 48 V. Top trace: output vol-
tage (100 mV/div). Bottom trace: load current (5 A/div.). Cur-
rent slew rate: 0.1 A/s. Co = 1 F ceramic. Time scale: 0.2
ms/div.
Fig. 20: Output voltage response to load current step-change
(3.75 A – 7.5 A – 3.75 A) at Vin = 48 V. Top trace: output vol-
tage (100 mV/div.). Bottom trace: load current (5 A/div). Cur-
rent slew rate: 5 A/s. Co = 450 F tantalum + 1 F ceramic.
Time scale: 0.2 ms/div.
MCD10170 Rev. 1.0, 10-Jun-10
Page 13 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
iS
iC
10 H
source
inductance
TM
33 F
ESR <1
electrolytic
capacitor
1 F
ceramic
capacitor
Family
Q
DC/DC
Converter
Semi
Vout
Vsource
Fig. 22: Test setup for measuring input reflected ripple
currents, ic and is.
Fig. 21: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 F tantalum + 1uF ce-
ramic and Vin = 48 V. Time scale: 1 s/div.
Fig. 24: Input reflected ripple current, is (10 mA/div), measured
through 10 H at the source at full rated load current and Vin =
48 V. Refer to Fig. 22 for test setup. Time scale: 1s/div.
Fig. 23: Input reflected ripple current, ic (100 mA/div), meas-
ured at input terminals at full rated load current and Vin = 48 V.
Refer to Fig. 22 for test setup. Time scale: 1 s/div.
MCD10170 Rev. 1.0, 10-Jun-10
Page 14 of 15
www.power-one.com
ASQ48T15033 & ASQ48S15033 DC-DC Converter Data Sheet
36 to 75 VDC Input; 15A, 3.3 VDC Output
4.0
3.0
2.0
1.0
0
20
0
5
10
15
Iout [Adc]
Fig. 26: Load current (top trace, 20 A/div, 20 ms/div) into a 10
m 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. 25: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost
no effect on current limit characteristic.
Fig. 27: Location of the thermocouple for thermal testing.
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.
MCD10170 Rev. 1.0, 10-Jun-10
Page 15 of 15
www.power-one.com
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