USQ-1.8/20-D48NDH [MURATA]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, 1.450 X 2.280 INCH, 0.400 INCH HEIGHT, QUARTER BRICK PACKAGE-8;型号: | USQ-1.8/20-D48NDH |
厂家: | muRata |
描述: | DC-DC Regulated Power Supply Module, 1 Output, Hybrid, 1.450 X 2.280 INCH, 0.400 INCH HEIGHT, QUARTER BRICK PACKAGE-8 |
文件: | 总22页 (文件大小:2199K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
®
®
A SUBSIDIARY OF C&D TECHNOLOGIES
Single Output
USQ 20A Models
High-Density, Quarter-Brick
20 Amp, DC/DC Converters
For low-voltage, high-current power . . . in the smallest space . . . over the widest
temperature range . . . call on DATEL’s USQ Series 20 Amp "quarter bricks." Occupy-
ing the industry-standard package (1.45" x 2.28" x 0.40") and pinout, USQ’s house
their fully-synchronous, forward design topology in a "two-board" assembly crowned
with a heat-sink-compatible aluminum baseplate. This combination of outstanding
thermal and electrical efficiencies endows USQ’s with industry-leading, thermal-
derating performance. The 1.8VOUT model, for example, delivers its full 20 Amps up to
+55°C with a mere 200 lfm air flow.
Features
Standard, 1.45" x 2.28" x 0.40"
quarter-brick package and pinout
Outstanding thermal-derating
Output current: to 20 Amps
OutputsVoltages:
1.2/1.5/1.8/2.5/3.3/5/12/15/18/24V
USQ’s achieve all the performance metrics required for contemporary, on-board
power processing: high isolation (1500Vdc), superior efficiency (to 91%), tight regula-
tion (to ±0.05% max. line and load), low noise (to 50mVp-p), quick step response
(200µsec), and an array of protection features. I/O protection includes input under-
voltage lockout and reverse-polarity protection, as well as output overvoltage pro-
tection, current limiting, short-circuit protection, and thermal shutdown. The USQ
functionality suite includes remote on/off control (positive or negative polarity), output
trim (+10/–20%), and output sense functions.
All USQ DC/DC’s are designed to meet the BASIC insulation requirements of
UL1950 and EN60950, and all 48 Volt models will carry the CE mark. Safety certifica-
tions, as well as EMC compliance testing and qualification testing (including HALT)
have been successfully completed. Contact DATEL for copies of the latest reports.
Input voltage ranges:
36-75V (48V nom.)
18-36V (24V nom.)
Synchronous rectification yields high
efficiency (to 91%) and stable no-load
operation
On/Off control, trim and sense functions
Fully isolated, 1500Vdc guaranteed
Fully I/O protected;Thermal shutdown
UL1950/EN60950 (BASIC insulation)
approvals
Qual tested; HALT tested; EMI compliant
+SENSE
(7)
+VOUT
(8)
+VIN
(3)
SWITCH
CONTROL
–VOUT
(4)
–VIN
(1)
–SENSE
(5)
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
V
OUT
TRIM
(6)
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
* Can be ordered with positive (standard) or negative (optional) polarity.
REMOTE
ON/OFF
CONTROL*
(2)
Figure 1. Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA)
·
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
·
Email: sales@datel.com
·
Internet: www.datel.com
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
➀
Performance Specifications and Ordering Guide
Output
Input
Package
(Case,
Pinout)
➂
R/N (mVp-p)
Regulation (Max.)
VIN Nom.
(Volts)➄
48
48
48
48
48
24
48
24
24
48
24
48
24
48
24
Range
(Volts)➄
36-75
36-75
36-75
36-75
36-75
18-36
36-75
18-36
18-36
36-75
18-36
36-75
18-36
36-75
18-36
36-75
36-75
IIN ➅
(Amps)
VOUT ➁
(Volts)
IOUT
(Amps)
Model
Typ.
25
40
50
60
70
90
90
90
135
120
140
145
145
145
115
115
115
Max.
50
65
80
75
Line
Load ➃
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.01%
Efficiency
80%
85%
85%
87%
89%
90%
90%
87.5%
90%
90%
91%
91%
91%
91%
92%
92%
94.5%
USQ-1.2/20-D48
USQ-1.5/20-D48
USQ-1.8/20-D48
USQ-2.5/20-D48
USQ-3.3/20-D48
USQ-5/20-D24
USQ-5/20-D48
USQ-6.5/16-D24
USQ-12/8.3-D24
USQ-12/8.3-D48
USQ-15/6.7-D24
USQ-15/6.7-D48
USQ-18/5.6-D24
USQ-18/5.6-D48
USQ-24/4.2-D24
USQ-24/4.2-D48
USQ-48/2.1-D48
1.2
1.5
1.8
2.5
3.3
5
20
20
20
20
20
20
20
16
8.3
8.3
6.7
6.7
5.6
5.6
4.2
4.2
2.1
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.05%
±0.01%
0.63/0.87
0.75/1.03
0.88/1.23
1.18/1.62
1.54/2.1
5.07/6.21
2.33/3.13
4.95/6.60
4.61/6.08
2.30/2.41
4.65/6.14
2.30/2.42
5.05/6.17
2.30/2.42
5.05/6.17
2.27/3.18
2.27/3.03
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
C33, P32
85
125
125
125
150
140
155
175
175
175
130
130
200
5
➆
➇
➇
6.5
12
12
15
15
18
18
24
24
48
48
48
➆
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless otherwise
noted. All models are tested and specified with external output capacitors (1µF ceramic in
parallel with 10µF tantalum).
P A R T N U M B E R S T R U C T U R E
➁ Contact DATEL for fixed output voltages (such as 2, 6.5, –5.2V) or higher output currents
(such as 12V @ 12.5A) other than those listed.
➂ Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth. Output noise may be further
reduced with the installation of additional external output filtering. See I/O Filtering, Input
Ripple Current, and Output Noise for details.
➃ The load-regulation specs apply over the 0-100% range. All models in the USQ Series have
no minimum-load requirements and will regulate within spec under no-load conditions (with
perhaps a slight increase in ripple/noise). Additionally, 1.2V, 1.5V, 1.8V, 2.5V and 5V models
are unconditionally stable, including start-up and short-circuit-shutdown situations, with
capacitive loads up to 25,000µF. The 12V,15V,18V and 24V models are unconditionally stable
with capacitive loads up to 470µF at full load.
-
D
U
SQ 3.3 20 D48
N
/
-
NegativeTrim:
Contact DATEL
Output Configuration:
U = Unipolar/Single
Remote On/Off Control Polarity:
Add "P" for positive polarity
(pin 2 open = converter on)
Add "N" for negative polarity
(pin 2 open = converter off)
Quarter-Brick Package
Nominal OutputVoltage:
1.2/1.5/1.8/2.5/3.3/5/12/15/18/24 Volts
➄ Contact DATEL for VIN ranges other than those listed.
Maximum Rated Output
Current in Amps
➅ The two listed dc currents are for the following conditions: full load/nominal input voltage and
full load/low line voltage.The latter is usually the worst-case condition for input current.
➆ Contact DATEL for availability and further information on these models.
➇ These models are discontinued. Refer to DATEL's ULQ and UVQ series for alternate models.
InputVoltage Range:
D48 = 36-75 Volts (48V nominal)
D24 = 18-36 Volts (24V nominal)
M E C H A N I C A L S P E C I F I C A T I O N S
2.28
(57.91)
A
2.28 (57.91)
BAR CODE AND
SERIAL NUMBER
APPLIED TO
1.860
(47.24)
THIS SURFACE.
MODEL NUMBER ON
OPPOSITE SURFACE.
0.40 MAX.
(10.16)
Optional
Heat Sink
PINS 1-3, 5-7:
0.040 ±0.001 (1.016 ±0.025)
PINS 4, 8:
1.03
(26.16)
1.45
(36.83)
0.15 MIN (3.81)
STANDOFF
0.015 (0.38)
0.062 ±0.001 (1.575 ±0.025)
OPEN-FRAME, CAST
ALUMINUM CASE
2.00 (50.80)
A
A
I/O Connections
Pin Function P32
1.860 (47.24)
0.140 DIA. (3.56) (4 PLACES)
1
2
3
4
5
6
7
8
–Input
Remote On/Off*
+Input
*
Case C33
1
2
3
4
5
6
(4) 0.170 DIA.
#M3 THD. THRU
WITH 0.090
–Output
MATERIAL: BLACK ANODIZED ALUMINUM
0.10
(2.54)
–Sense
7
8
THREAD RELIEF
* USQ SERIES HEATSINKS ARE AVAILABLE IN 3 HEIGHTS:
0.25 (6.35), 0.50 (12.70) AND 1.00 (25.4)
Output Trim
+Sense
+Output
Heat Sink Ordering Information
BOTTOM VIEW
Heat Sink Height
DATEL Part Number
0.300
(7.62)
0.600 (15.24)
4 EQ. SP. @
0.150 (3.81)
* The Remote On/Off
can be provided with
either positive (standard)
or negative (optional)
polarity.
0.25 inches (6.35mm)
HS-QB25
DIMENSIONS ARE IN INCHES (MM)
0.50 inches (12.70mm)
HS-QB50
1.00 inches (25.40mm)
HS-QB100
➀ DATEL conforms to industry-standard quarter-brick pinout (see Figure 20).
All heat sinks include 4 mounting screws and a thermal pad.
➁ A "baseplate only" model with a maximum height of 0.375" (9.53mm) is
available with the addition of an "H" suffix. Contact DATEL.
If using heatsinks other than DATEL's HS-QB series, the screw length should accomo-
date the 0.090 thread relief.
2
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted.
Output (Continued)
Magnetic feedback
(1)
Overvoltage Protection: (4)
1.5VOUT
1.8VOUT
2.5VOUT
3.3VOUT
5VOUT
12VOUT
15VOUT
18VOUT
24VOUT
2.2 Volts
2.7 Volts
3.8 Volts
4.9 Volts
6.4 Volts
15 Volts
20 Volts
22.5 Volts
30 Volts
Input
InputVoltage Range:
D24 Models
D48 Models
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
None (3)
Overvoltage Shutdown
Start-UpThreshold: (4)
D24 Models
15.5-18 Volts (16.5V typical)
28.5-32 Volts (30V typical)
D48 Models
Undervoltage Shutdown: (4)
D24 Models
D48 Models
Dynamic Characteristics
Dynamic Load Response (11)
See Dynamic Load Response
14.5-16.5 Volts (15.5V typical)
26.5-29.5 Volts (28.3V typical)
under Technical Notes
Start-UpTime: (4) (12)
VIN to VOUT
On/Off to VOUT
Input Current:
Normal Operating Conditions
Inrush Transient
See Ordering Guide
0.05A sec maximum
5msec typical, 8msec maximum
5msec typical, 8msec maximum
(11)
2
Standby Mode:
Off, UV, Thermal Shutdown
Input Reflected Ripple Current (5)
Switching Frequency
3mA
Environmental
5mAp-p
(13)
Calculated MTBF:
>2.5 million hours
Internal Input FilterType:
D24 Models
D48 Models
(4) (14)
OperatingTemperature (Ambient):
Without Derating
With Derating
Pi (0.01µF - 1.5µH - 3.3µF)
Pi (0.01µF - 4.7µH - 3.3µF)
Model and air flow dependent
To +110°C (baseplate)
Reverse-Polarity Protection (3)
1 minute duration, 5A maximum
(4) (14)
BaseplateTemperature:
Maximum Allowable
Thermal Shutdown
(6)
Remote On/Off Control (Pin 2):
Positive Logic ("P" Suffix Models)
+110°C
+115-122°C, +118°C typical.
On = open, open collector or
2.5-5V applied. IIN = 150µA max.
Off = pulled low to 0-0.8V IIN = 800µA max.
On = pulled low to 0-0.8V IIN = 800µA max.
Off = open, open collector or
Physical
1.45" x 2.28" x 0.40" (36.8 x 57.9 x 10.2mm)
Negative Logic ("N" Suffix Models)
Dimensions
Case Material
Baseplate Material
Shielding
Cast aluminum
Aluminum
2.5-5V applied. IIN = 150µA max.
Output
Neither the aluminum case nor baseplate
are connected to a package pin
Minimum Loading
Maximum Capacitive Loading (7)
No load
25,000µF
Pin Material
Weight:
Brass, solder coated
VOUT Accuracy (Full Load):
Initial
Temperature Coefficient
Extreme (8)
1.52 ounces (43 grams)
±1% maximum
±0.02% per °C
±3%
Primary-to-Secondary Insulation Level Basic
(1)
All models are tested and specified with external output capacitors (1µF ceramic in parallel
with 10µF tantalum), unless otherwise noted.These converters have no minimum-load require
ments and will effectively regulate under no-load conditions.
Contact DATEL for input voltage ranges (18-36V, 24V nominal) other than those listed.
See Absolute Maximum Ratings for allowable input voltages.
See Technical Notes/Performance Curves for additional explanations and details.
Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 33µF input
capacitor and a simulated source impedance of 220µF and 12µH. See I/O Filtering, Input
Ripple Current and Output Noise for details.The 24V input models can benefit by increasing the
33µF external input capacitance to 100µF, if the application has a high source impedance.
The On/Off Control is designed to be driven with open-collector (or equivalent) logic or the
application of appropriate voltages (referenced to –Input (pin 1)). See Remote On/Off Control
for more details.
USQ Series DC/DC converters are unconditionally stable, including start-up and short-circuit-
shutdown situations, with capacitive loads up to 25,000µF (470µF for 12V, 15V, 18V and 24V
models at full load).
Extreme Accuracy refers to the accuracy of either trimmed or untrimmed output voltages over
all normal operating ranges and combinations of input voltage, output load and temperature.
See Output Trimming for detailed trim equations.
The Current-Limit Inception point is the output current level at which the USQ’s power-limiting
circuitry drops the output voltage 10% from its initial value. See Output Current Limiting and
Short-Circuit Protection for more details.
See Dynamic Load Response under Technical Notes for detailed results including switching
frequencies. DATEL has performed extensive evaluations of Dynamic Load Response. In addi
tion to the 10µF || 1µF external capacitors, specifications are also given for 220µF || 1µF
external output capacitors for quick comparison purposes.
VOUT Trim Range (9)
+10%, –20%
Remote Sense Compensation (4)
Ripple/Noise (20MHz BW)
Line/Load Regulation
Efficiency
+10%
(2)
(3)
(4)
(5)
See Ordering Guide
See Ordering Guide
See Ordering Guide
IsolationVoltage:
Input-to-Output
Input-to-Case
1500Vdc minimum
1500Vdc minimum
1500Vdc minimum
(6)
(7)
Output-to-Case
Isolation Resistance
Isolation Capacitance
Current Limit Inception (90% VOUT) (10)
1.2VOUT
1.5, 1.8, 2.5, 3.3, 5VOUT
12VOUT
15VOUT
18VOUT
24VOUT
Short Circuit: (4)
Current
100MΩ
650pF
(8)
(9)
22-30 Amps (26A typical)
22-29 Amps (26A typical)
9.2-10.5 Amps (9.9A typical)
7.6-8.9 Amps (8.25A typical)
6-7.75 Amps (6.5A typical)
4.8-6 Amps (5.5A typical)
(10)
(11)
(12)
(13)
(14)
For the Start-Up Time specifications, output settling is defined by the output voltage having
reached ±1% of its final value.
MTBF’s are calculated using Telcordia (Bellcore) Method 1 Case 3, ground fixed conditions,
+40°C case temperature, and full-load conditions. Contact DATEL for demonstrated life-test data.
All models are fully operational and meet published specifications, including "cold start," at –40°C.
Hiccup
Continuous
Duration
3
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
impedance as highly inductive source impedance can affect system stability.
In Figure 2, CBUS and LBUS simulate a typical dc voltage bus.Your specific
system configuration may necessitate additional considerations.
Absolute Maximum Ratings
InputVoltage:
Continuous:
24V models
39 Volts
50 Volts
48V models
81 Volts
100 Volts
Transient (100msec)
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) can be reduced below specified limits using
filtering techniques, the simplest of which is the installation of additional
external output capacitors. Output capacitors function as true filter elements
and should be selected for bulk capacitance, low ESR, and appropriate
frequency response. In Figure 3, the two copper strips simulate real-world
pcb impedances between the power supply and its load. Scope measurements
should be made using BNC connectors or the probe ground should be less
than ½ inch and soldered directly to the fixture.
Input Reverse-Polarity Protection
Input Current must be <5A. 1 minute
duration. Fusing recommended.
Output Current
Current limited. Devices can withstand
an indefinite output short circuit.
On/Off Control (Pin 2) Max.Voltages
Referenced to –Input (pin 1)
–0.3 to +7 Volts
–40 to +125°C
+300°C
StorageTemperature
LeadTemperature (Soldering, 10 sec.)
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied, nor recommended.
All external capacitors should have appropriate voltage ratings and be
located as close to the converter as possible.Temperature variations for all
TM
relevant parameters should be taken into consideration. OS-CON organic
semiconductor capacitors (www.sanyo.com) can be especially effective for
further reduction of ripple/noise.
T E C H N I C A L N O T E S
The most effective combination of external I/O capacitors will be a function
of line voltage and source impedance, as well as particular load and layout
conditions. Our Applications Engineers can recommend potential solutions
and discuss the possibility of our modifying a given device’s internal filtering
to meet your specific requirements. Contact our Applications Engineering
Group for additional details.
Removal of Soldered USQ's from PCB's
Should removal of the USQ from its soldered connection be needed, it is very
important to thoroughly de-solder the pins using solder wicks or de-soldering
tools. At no time should any prying or leverage be used to remove boards that
have not been properly de-soldered first.
Input Source Impedance
USQ converters must be driven from a low ac-impedance input source.
The DC/DC’s performance and stability can be compromised by the use of
highly inductive source impedances.The input circuit shown in Figure 2 is a
practical solution that can be used to minimize the effects of inductance in
the input traces. For optimum performance, components should be mounted
close to the DC/DC converter.The 24V models can benefit by increasing
the 33µF external input capacitors to 100µF, if the application has a high
source impedance.
7
COPPER STRIP
+SENSE
8
+OUTPUT
R
LOAD
SCOPE
C1
C2
4
5
–OUTPUT
–SENSE
COPPER STRIP
I/O Filtering, Input Ripple Current, and Output Noise
C1 = 1µF CERAMIC
C2 = 10µF TANTALUM
All models in the USQ Series are tested/specified for input ripple current (also
called input reflected ripple current) and output noise using the circuits and
layout shown in Figures 2 and 3.
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple/Noise (PARD)
TO
CURRENT
PROBE
OSCILLOSCOPE
Input Overvoltage Shutdown
3
1
+INPUT
–INPUT
Standard USQ DC/DC converters do not feature overvoltage shutdown.
They are equipped with this function, however. Many of our customers need
their devices to withstand brief input surges to 100V without shutting down.
Consequently, we disabled the function. Please contact us if you would like it
enabled, at any voltage, for your application.
L
BUS
+
V
IN
C
BUS
CIN
–
C
C
IN = 33µF, ESR < 700mΩ @ 100kHz
BUS = 220µF, ESR < 100mΩ @ 100kHz
Start-UpThreshold and Undervoltage Shutdown
L
BUS = 12µH
Under normal start-up conditions, the USQ Series will not begin to regulate
properly until the ramping input voltage exceeds the Start-Up Threshold.
Once operating, devices will turn off when the applied voltage drops below
the Undervoltage Shutdown point. Devices will remain off as long as the
undervoltage condition continues. Units will automatically re-start when the
applied voltage is brought back above the Start-Up Threshold. The hyster-
esis built into this function avoids an indeterminate on/off condition at a single
input voltage. See Performance/Functional Specifications table for actual limits.
Figure 2. Measuring Input Ripple Current
External input capacitors (CIN in Figure 2) serve primarily as energy-storage
elements.They should be selected for bulk capacitance (at appropriate
frequencies), low ESR, and high rms-ripple-current ratings.The switching
nature of DC/DC converters requires that dc voltage sources have low ac
4
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
of 5 to 15 milliseconds, the PWM will restart, causing the output voltages to begin
ramping to their appropriate values. If the short-circuit condition persists,
another shutdown cycle will be initiated.This on/off cycling is referred to
as “hiccup” mode.The hiccup cycling reduces the average output current,
thereby preventing internal temperatures from rising to excessive levels.The
USQ is capable of enduring an indefinite short circuit output condition.
Start-UpTime
The VIN to VOUT Start-Up Time is the interval between the point at which
a ramping input voltage crosses the Start-Up Threshold voltage and the
point at which the fully loaded output voltage enters and remains within it
specified ±1% accuracy band. Actual measured times will vary with input
source impedance, external input capacitance, and the slew rate and final
value of the input voltage as it appears to the converter.The On/Off to VOUT
Start-Up Time assumes the converter is turned off via the Remote On/Off
Control with the nominal input voltage already applied.The specification
defines the interval between the point at which the converter is turned on
(released) and the point at which the fully loaded output voltage enters and
remains within its specified ±1% accuracy band.
Thermal Shutdown
USQ converters are equipped with thermal-shutdown circuitry. If the internal
temperature of the DC/DC converter rises above the designed operating tem-
perature (See Performance Specifications), a precision temperature sensor
will power down the unit. When the internal temperature decreases below
the threshold of the temperature sensor, the unit will self start.
Output Overvoltage Protection
On/Off Control
The output voltage is monitored for an overvoltage condition via magnetic
coupling to the primary side. If the output voltage rises to a fault condition,
which could be damaging to the load circuitry (see Performance Specifica-
tions), the sensing circuitry will power down the PWM controller causing
the output voltage to decrease. Following a time-out period the PWM will
restart, causing the output voltage to ramp to its appropriate value. If the
fault condition persists, and the output voltages again climb to excessive
levels, the overvoltage circuitry will initiate another shutdown cycle. This
on/off cycling is referred to as "hiccup" mode.
The primary-side, Remote On/Off Control function (pin 2) can be specified to
operate with either positive or negative polarity. Positive-polarity devices ("P"
suffix) are enabled when pin 2 is left open or is pulled high (+2.5-5V applied
with respect to –Input, pin 1, IIN < 150µA typical). Positive-polarity devices are
disabled when pin 2 is pulled low (0-0.8V with respect to –Input, IIN < 800µA.
Negative-polarity devices are off when pin 2 is high/open and on when pin 2
is pulled low. See Figure 4.
EQUIVALENT CIRCUIT FOR
POSITIVE AND NEGATIVE
LOGIC MODELS
+5V
+INPUT
3
Input Reverse-Polarity Protection
200k
2
If the input-voltage polarity is accidentally reversed, an internal diode will
become forward biased and likely draw excessive current from the power
source. If the source is not current limited (<5A) nor the circuit appropriately
fused, it could cause permanent damage to the converter.
ON/OFF
CONTROL
CONTROL
200k
REF
1
Input Fusing
–INPUT
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of a sustained, non-current-limited, input-voltage polar-
ity reversal exists. For DATEL USQ Series DC/DC Converters, slow-blow
fuses are recommended with values no greater than the following:
Figure 4. Driving the Remote On/Off Control Pin
Dynamic control of the remote on/off function is best accomplished with
a mechanical relay or an open-collector/open-drain drive circuit (optically
isolated if appropriate).The drive circuit should be able to sink appropriate
current (see Performance Specifications) when activated and withstand
appropriate voltage when deactivated.
VOUT Range
1.2VOUT Models
1.5VOUT Models
1.8VOUT Models
2.5VOUT Models
3.3VOUT Models
5to24VOUT Models
FuseValue -D48
1.5 Amps
2.5 Amps
3 Amps
FuseValue -D24
—
—
—
—
—
Current Limiting
3.5 Amps
4 Amps
6 Amps
When power demands from the output falls within the current limit inception
range for the rated output current, the DC/DC converter will go into a current
limiting mode. In this condition the output voltage will decrease propor-
tionately with increases in output current, thereby maintaining a somewhat
constant power dissipation.This is commonly referred to as power limiting.
Current limit inception is defined as the point where the full-power output
voltage falls below the specified tolerance. If the load current being drawn
from the converter is significant enough, the unit will go into a short circuit
condition. See “Short Circuit Condition.”
10 Amps
See Performance Specifications for Input Current and Inrush Transient limits.
Trimming OutputVoltage
USQ converters have a trim capability (pin 6) that enables users to adjust
the output voltage from +10% to –20% (refer to the trim equations and trim
graphs that follow). Adjustments to the output voltage can be accomplished
with a single fixed resistor as shown in Figures 5 and 6. A single fixed resis-
tor can increase or decrease the output voltage depending on its connection.
Resistors should be located close to the converter and have TCR's less than
100ppm/°C to minimize sensitivity to changes in temperature. If the trim
function is not used, leave the trim pin open.
Short Circuit Condition
When a converter is in current limit mode the output voltages will drop as
the output current demand increases. If the output voltage drops too low, the
magnetically coupled voltage used to develop primary side voltages will also
drop, thereby shutting down the PWM controller. Following a time-out period
5
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
Standard USQ's have a "positive trim" where a single resistor connected from
the Trim pin (pin 6) to the +Sense (pin 7) will increase the output voltage.
A resistor connected from the Trim Pin (pin 6) to the –Sense (pin 5) will
decrease the output voltage. DATEL also offers a "negative trim" function (D
suffix added to the part number). Contact DATEL for information on negative
trim devices.
Trim Equations
USQ-1.2/20-D48
1.308(V
O
– 0.793)
1.037
–1.413
–1.413
–10.2
–10.2
–10.2
R
TUP (kΩ) =
TUP (kΩ) =
RTDOWN (kΩ) =
VO
– 1.2
1.2 – V
O
USQ-1.5/20-D48
Trim adjustments greater than the specified +10%/–20% can have an
adverse affect on the converter’s performance and are not recommended.
Excessive voltage differences between VOUT and Sense, in conjunction with
trim adjustment of the output voltage, can cause the overvoltage protection
circuitry to activate (see Performance Specifications for overvoltage limits).
6.23(V
O
– 1.226)
7.64
–10.2
R
RTDOWN (kΩ) =
VO
– 1.5
1.5 – V
O
O
O
USQ-1.8/20-D48
9.12
7.44(V
O
– 1.226)
Temperature/power derating is based on maximum output current and volt-
age at the converter's output pins. Use of the trim and sense functions can
cause output voltages to increase, thereby increasing output power beyond
the USQ's specified rating, or cause output voltages to climb into the output
overvoltage region.Therefore:
–10.2
RTDOWN (kΩ) =
R
TUP (kΩ) =
TUP (kΩ) =
1.8 – V
VO – 1.8
USQ-2.5/20-D48
10(V
O
– 1.226)
– 2.5
12.26
–10.2
R
RTDOWN (kΩ) =
VO
2.5 – V
(VOUT at pins) x (IOUT) ≤ rated output power
USQ-3.3/20-D48
The Trim pin (pin 6) is a relatively high impedance node that can be suscep-
tible to noise pickup when connected to long conductors in noisy environ-
ments. In such cases, a 0.22µF capacitor can be added to reduce this long
lead effect.
16.31
13.3(V
O
– 1.226)
–10.2
–10.2
–10.2
–10.2
–10.2
–10.2
–10.2
RTDOWN (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
RTUP (kΩ) =
3.3 – V
O
VO – 3.3
USQ-5/20-D24, -D48
25.01
20.4(VO – 1.226)
–10.2
RTDOWN (kΩ) =
5 – V
O
VO – 5
8
1
+OUTPUT
–INPUT
USQ-12/8.3-D24, -D48
7
+SENSE
60.45
12 – V
49.6(V
O
– 1.226)
–10.2
RTDOWN (kΩ) =
2
3
6
5
4
ON/OFF
CONTROL
O
VO – 12
TRIM
–SENSE
LOAD
RTRIM UP
USQ-15/6.7-D24, -D48
76.56
62.9(VO – 1.226)
+INPUT
–10.2
RTDOWN (kΩ) =
–OUTPUT
15 – V
O
O
O
VO – 15
USQ-18/5.6-D24, -D48
Figure 5.Trim ConnectionsTo Increase OutputVoltages Using Fixed Resistors
92.9
75.5(VO – 1.226)
–10.2
RTDOWN (kΩ) =
18 – V
VO – 18
8
1
USQ-24/4.2-D24, -D48
+OUTPUT
–INPUT
124.2
101(V
O
– 1.226)
– 24
7
–10.2
+SENSE
RTDOWN (kΩ) =
24 – V
VO
2
3
6
5
4
ON/OFF
CONTROL
TRIM
–SENSE
LOAD
Note: Resistor values are in kΩ. Adjustment accuracy is subject to resistor
tolerances and factory-adjusted output accuracy. VO = desired output voltage.
RTRIM DOWN
+INPUT
–OUTPUT
Figure 6.Trim ConnectionsTo Decrease OutputVoltages Using Fixed Resistors
6
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
Trim-Up Resistance vs. Percentage Increase in Output Voltage
1 x106
1 x105
1 x104
1 x103
1 x107
1 x106
1 x105
1 x104
1 x103
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
10
10
VOUT INCREASE (%)
VOUT INCREASE (%)
Figure 7. USQ-1.2Trim-Up Resistance vs. % IncreaseVOUT
Figure 8. USQ-1.5Trim-Up Resistance vs. % IncreaseVOUT
1 x107
1 x106
1 x105
1 x104
1 x107
1 x106
1 x105
1 x104
1 x107
1 x106
1 x105
1 x104
1 x108
1 x107
1 x106
1 x105
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
VOUT INCREASE (%)
VOUT INCREASE (%)
Figure 10. USQ-2.5Trim-Up Resistance vs. % IncreaseVOUT
Figure 9. USQ-1.8Trim-Up Resistance vs. % IncreaseVOUT
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
VOUT INCREASE (%)
VOUT INCREASE (%)
Figure 11. USQ-3.3Trim-Up Resistance vs. % IncreaseVOUT
Figure 12. USQ-5Trim-Up Resistance vs. % IncreaseVOUT
7
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
Trim-Up Resistance vs. Percentage Increase in Output Voltage
1 x108
1 x108
1 x107
1 x106
1 x107
1 x106
1 x105
1 x105
1 x108
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
VOUT INCREASE (%)
VOUT INCREASE (%)
Figure 14. USQ-15Trim-Up Resistance vs. % IncreaseVOUT
Figure 13. USQ-12Trim-Up Resistance vs. % IncreaseVOUT
1 x108
1 x107
1 x106
1 x105
1 x107
1 x106
1 x105
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
VOUT INCREASE (%)
VOUT INCREASE (%)
Figure 15. USQ-18Trim-Up Resistance vs. % IncreaseVOUT
Figure 16. USQ-24Trim-Up Resistance vs. % IncreaseVOUT
Trim-Down Resistance vs. Percentage Decrease in Output Voltage
1 x106
1 x105
1 x104
1 x103
1 x107
1 x106
1 x105
1 x104
0
2
4
6
8
10
12
14
16
18
20
0
2
4
6
8
10
12
14
16
18
20
VOUT DECREASE (%)
VOUT DECREASE (%)
Figure 17. USQ-1.2Trim-Down Resistance vs. % DecreaseVOUT
Figure 18. USQ-1.5 to USQ-18Trim-Down Resistance vs. % DecreaseVOUT
8
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
Negative-Trim Units ("D" Suffix)
Floating Outputs
Standard USQ's have a "positive-trim" function, consistent with the industry
standard footprints and functionality. DATEL also offers "negative-trim" USQ's
designated with a "D" suffix to the part number.The negative-trim devices
trim up with a single resistor tied from the Output Trim (pin 6) to the –Sense
(pin 5) to increase the output voltage. A resistor connected from the Output
Trim (pin 6) to the +Sense (pin 7) will decrease the ouput voltage.
Since these are isolated DC/DC converters, their outputs are "floating" with
respect to their input. Designers will normally use the –Output (pin 4) as the
ground/return of the load circuit.You can, however, use the +Output (pin 8) as
ground/return to effectively reverse the output polarity.
Remote Sense
Note:The Sense and VOUT lines are not internally connected to each other.
Therefore, if the sense function is not used for remote regulation, the user
must connect the +Sense to +VOUT and –Sense to –VOUT at the DC/DC
converter pins.
The "negative-trim" formula values for USQ 1.2/1.5/1.8 Volt devices with a
48 Volt input and negative logic reads:
A – Bx ∆V
RTRIM =
USQ series converters employ a sense feature to provide point-of-use regu-
lation, thereby overcoming moderate IR drops in pcb conductors or cabling.
The remote sense lines carry very little current and therefore require a mini-
mal cross-sectional area conductor. The sense lines, which are capacitively
coupled to their respective output lines, are used by the feedback control-loop
to regulate the output. As such, they are not low impedance points and must
be treated with care in layouts and cabling. Sense lines on a pcb should be
run adjacent to dc signals, preferably ground. In cables and discrete wiring
applications, twisted pair or other techniques should be implemented.
∆V
Model
Trim Up
Trim Down
A
B
A
B
USQ-1.8/20-D48ND
0.57
1
0.2711 1.4676
USQ-1.5/20-D48ND 0.283 0.121 0.065 0.352
USQ-1.2/20-D48ND 0.5928 3.01 0.5686 3.96
where ∆V is the absolute value of the output voltage change desired.
USQ DC/DC converters will compensate for drops between the output
voltage at the DC/DC and the sense voltage at the DC/DC:
[VOUT(+) –VOUT(–)] – [Sense(+) –Sense (–)] ≤ 10% VOUT
Contact and PCB resistance
losses due to IR drops
8
1
+OUTPUT
–INPUT
IOUT
7
+SENSE
Sense Current
2
3
ON/OFF
CONTROL
6
5
TRIM
–SENSE
LOAD
Sense Return
IOUT Return
4
+INPUT
–OUTPUT
Contact and PCB resistance
losses due to IR drops
Figure 19. Remote Sense Circuit Configuration
Output overvoltage protection is monitored at the output voltage pin, not
the Sense pin. Therefore, excessive voltage differences between VOUT and
Sense, in conjunction with trim adjustment of the output voltage, can cause
the overvoltage protection circuitry to activate (see Performance Specifica-
tions for overvoltage limits). Power derating is based on maximum output
current and voltage at the converter’s output pins. Use of trim and sense
functions can cause output voltages to increase, thereby increasing output
power beyond the USQ’s specified rating, or cause output voltages to climb
into the output overvoltage region.Therefore:
(VOUT at pins) × (IOUT) ≤ rated output power
9
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
Dynamic Load Response and Switching Frequency
To avoid the added cost of constantly changing test fixtures, we have veri-
fied, during our device characterization/verification testing, that 100% testing
under the former conditions (the 100µF || 1µF load), which we guarantee,
correlates extremely well with the latter conditions, for which we and most of
our competitors simply list typicals.
DATEL has performed extensive evaluations, under assorted capacitive-load
conditions, of the dynamic-load capabilities (i.e., the transient or step
response) of USQ Series DC/DC Converters. In particular, we have evalu-
ated devices using the output capacitive-load conditions we use for our
routine production testing (10µF tantalums in parallel with 1µF ceramics), as
well as the load conditions many of our competitors use (220µF tantalums
in parallel with 1µF ceramics) when specifying the dynamic performance of
their devices.
If you have any questions about our test methods or would like us to perform
additional testing under your specific load conditions, please contact our
Applications Engineering Group.
Load Conditions ➀
Performance Specifications
1.2VOUT
1.5VOUT
1.8VOUT
2.5VOUT
3.3VOUT
5VOUT
12 to 24VOUT
Load Step = 50 to 75% of IOUT Max.:
Peak Deviation, typ.
Settling Time to ±1% of Final Value, max. ➁
115mV
200µs
110mV
200µs
125mV
225µs
100mV
200µs
170mV
100µs
125mV
100µs
100mV
100µs
COUT = 10µF || 1µF
10µF || 1µF
Load Step = 75 to 50% of IOUT Max.:
Peak Deviation, typ.
115mV
140µs
110mV
200µs
125mV
225µs
100mV
200µs
100mV
100µs
125mV
100µs
100mV
100µs
Settling Time to ±1% of Final Value, max. ➁
Load Step = 50 to 75% of IOUT Max.:
Peak Deviation, typ.
Settling Time to ±1% of Final Value, typ. ➁
120mV
115µs
TBD
TBD
105mV
170µs
90mV
65µs
105mV
65µs
TBD
TBD
85mV
40µs
COUT = 220µF || 1µF
Load Step = 75 to 50% of IOUT Max.:
Peak Deviation, typ.
120mV
150µs
TBD
TBD
90mV
150µs
90mV
70µs
105mV
65µs
TBD
TBD
50mV
25µs
Settling Time to ±1% of Final Value, typ. ➁
Switching Frequency (min./typ./max. kHz)
120/150/180 120/150/180 170/185/200 230/255/280 132/147/162 220/240/260 190/210/230
➀ The listed pair of parallel output capacitors consists of a tantalum in parallel with a multi-layer ceramic.
➁ ∆IO/∆t = 1A/1µs, VIN = 48V, TC = 25°C.
10
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2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
Typical Performance Curves for 1.2VOUT Models
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USQ-1.2/20-D48 Efficiency vs. Line Voltage and Load Current
90
85
80
75
70
65
60
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2
4
6
8
10
12
14
16
18
20
Load Current (Amps)
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Start-Up from VIN
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
TBD
TBD
20V/div
1V/div
2msec/div
Start-Up from Remote On/Off Control
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
TBD
2V/div
TBD
1V/div
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11
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
Typical Performance Curves for 1.5VOUT Models
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Start-Up from VIN
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
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ꢗ
ꢠꢟꢟꢊꢉꢌꢩ
+Input (pin 3)
ꢞꢟꢟꢊꢉꢌꢩ
20V/div
ꢕꢈꢅꢆꢋꢈꢉꢊꢦꢁꢂꢧꢙꢨꢅꢄꢁꢂ
ꢑꢟꢟꢊꢉꢌꢩ
ꢠ
1V/div
ꢑ
1.5VOUT (pin 8)
2msec/div
ꢞ
ꢟ
ꢡꢑꢟꢊ
ꢡꢐꢟꢊ
ꢟꢊ
ꢐꢟꢊ
ꢞꢟꢊ
ꢢꢟꢊ
ꢑꢟꢊ
ꢣꢟꢊ
ꢠꢟꢊ
ꢤꢟꢊ
ꢗꢟꢊ
ꢥꢟꢊ
ꢐꢟꢟ
ꢝꢒꢞꢑꢙꢚꢕꢍꢟꢙꢒꢖꢙꢘꢏꢕꢓꢘꢙꢍꢠ�ꢗꢡ
Start-Up from Remote On/Off Control
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
Remote On/Off Control (pin 2)
2V/div
1V/div
1.5VOUT (pin 8)
2msec/div
12
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
Typical Performance Curves for 1.8VOUT Models
�ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢂꢉꢊꢅꢋꢌꢍꢎꢏꢐꢑꢒꢑꢌꢓꢒꢔꢕꢒꢔꢌꢖꢒꢗꢗꢘꢙꢔꢌꢚꢛꢄꢌꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘ
�ꢀꢁꢂꢃꢄꢅꢆꢁꢄꢆꢇꢂꢈꢁꢇꢉꢊꢋꢌꢍꢇꢎꢈꢃꢇꢏꢇꢐꢋꢇꢎꢈꢃꢇꢑꢒꢇꢓꢔꢕꢇꢖꢇꢗꢘꢓꢍꢇꢃꢋꢇꢙꢆꢂꢐꢇꢄꢈꢃꢚꢛꢜ
�ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢂꢉꢊꢅꢋꢌꢍꢍꢎꢏꢎꢐꢑꢏꢒꢋꢓꢔꢄꢋꢕꢎꢑꢐꢋꢖꢗꢘꢙꢚꢛꢐꢆꢕꢗꢚꢜꢋꢝꢞꢟꢟꢐꢑ ꢋ ꢋꢇꢡꢢꢝ
�ꢀ
ꢝꢝ
ꢝꢞ
ꢏꢘ
ꢏꢟ
ꢏꢗ
ꢏꢝ
ꢏꢞ
ꢘ
ꢁꢂ
ꢁꢀ
ꢃꢂ
ꢃꢀ
ꢄꢂ
ꢝꢞꢞꢇꢊꢉꢧ
ꢗꢞꢞꢇꢊꢉꢧ
ꢕꢂꢐꢤꢁꢂꢊꢇꢥꢋꢃꢅꢆꢦꢐꢈꢋꢃ
ꢟꢞꢞꢇꢊꢉꢧ
ꢀ
ꢉꢊꢅꢁꢂꢃꢄꢀ
ꢀ
ꢉꢊꢅꢁꢂꢇꢈꢀ
ꢟ
ꢗ
ꢀꢉꢊꢅꢁꢂꢅꢆꢀ
ꢝ
ꢄꢀ
ꢅꢅꢅ ꢆꢅ
ꢞ
ꢠꢗꢞꢇ
ꢇꢅ
ꢄꢅ
ꢁꢅ
ꢈꢀꢅ
ꢈꢆꢅ
ꢈꢇꢅ
ꢈꢄꢅ
ꢈꢁꢅ
ꢆꢀ
ꢠꢏꢞꢇ
ꢞꢇ
ꢏꢞꢇ
ꢝꢞꢇ
ꢑꢞꢇ
ꢗꢞꢇ
ꢡꢞꢇ
ꢟꢞꢇ
ꢢꢞꢇ
ꢘꢞꢇ
ꢣꢞꢇ
ꢏꢞꢞ
ꢕꢗꢚꢜꢋꢝꢞꢟꢟꢐꢑꢙꢋꢣꢤꢥꢦꢔꢧ
ꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘꢌꢟ�ꢖꢠ
�ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢂꢉꢊꢅꢋꢌꢍꢎꢏꢐꢑꢒꢑꢌꢓꢒꢔꢕꢒꢔꢌꢖꢒꢗꢗꢘꢙꢔꢌꢚꢛꢄꢌꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘ
�ꢀꢁꢂꢃꢄꢅꢆꢇꢄꢂꢈꢉꢊꢈꢄꢋꢊꢌꢉꢁꢍꢎꢊꢏꢄꢂꢊꢐꢊꢅꢁꢊꢏꢄꢂꢊꢑꢒꢊꢓꢔꢕꢊꢖꢊꢑꢗꢓꢎꢊꢂꢁꢊꢘꢙꢈꢅꢊꢚꢄꢂꢛꢜꢝ
Start-Up from VIN
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
ꢞꢞ
ꢞꢟ
ꢐꢗ
ꢐꢠ
ꢐꢑ
ꢐꢞ
ꢐꢟ
ꢗ
ꢠꢟꢟꢊꢉꢌꢩ
ꢞꢟꢟꢊꢉꢌꢩ
+Input (pin 3)
20V/div
ꢑꢟꢟꢊꢉꢌꢩ
ꢕꢈꢅꢆꢋꢈꢉꢊꢦꢁꢂꢧꢙꢨꢅꢄꢁꢂ
ꢠ
1V/div
ꢑ
1.8VOUT (pin 8)
2msec/div
ꢞ
ꢟ
ꢡꢑꢟꢊ
ꢡꢐꢟꢊ
ꢟꢊ
ꢐꢟꢊ
ꢞꢟꢊ
ꢢꢟꢊ
ꢑꢟꢊ
ꢣꢟꢊ
ꢠꢟꢊ
ꢤꢟꢊ
ꢗꢟꢊ
ꢥꢟꢊ
ꢐꢟꢟ
ꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘꢌꢟ�ꢖꢠ
Start-Up from Remote On/Off Control
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
Remote On/Off Control (pin 2)
2V/div
1V/div
1.8VOUT (pin 8)
2msec/div
13
ꢝꢞꢇ
ꢝꢠꢇ
ꢑꢞꢇ
ꢑꢠꢇ
ꢗꢞꢇ
ꢗꢠꢇ
ꢠꢞꢇ
ꢠꢠꢇ
ꢟꢞꢇ
ꢟꢠꢇ
ꢡꢞꢇ
ꢡꢠꢇ
ꢘꢞꢇ
ꢘꢠ
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
Typical Performance Curves for 2.5VOUT Models
�ꢀꢁꢂꢃꢄꢅꢆꢃꢇꢂꢈꢉꢊꢋꢌꢍꢎꢏꢐꢑꢒꢑꢌꢓꢒꢔꢕꢒꢔꢌꢖꢒꢗꢗꢘꢙꢔꢌꢚꢛꢄꢌꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘ
�ꢀꢁꢂꢃꢄꢅꢆꢁꢄꢆꢇꢂꢈꢁꢇꢉꢊꢋꢌꢍꢇꢎꢈꢃꢇꢏꢇꢐꢋꢇꢎꢈꢃꢇꢑꢒꢇꢓꢔꢕꢇꢖꢇꢗꢘꢓꢍꢇꢃꢋꢇꢙꢆꢂꢐꢇꢄꢈꢃꢚꢛꢜ
�ꢀꢁꢂꢃꢄꢅꢆꢃꢇꢂꢈꢉꢊꢋꢌꢍꢍꢎꢏꢎꢐꢑꢏꢒꢋꢓꢔꢄꢋꢕꢎꢑꢐꢋꢖꢗꢘꢙꢚꢛꢐꢆꢕꢗꢚꢜꢋꢝꢞꢟꢟꢐꢑ ꢋ ꢋꢃꢅꢡꢝ
ꢝꢝ
ꢝꢞ
ꢏꢘ
ꢏꢟ
ꢏꢗ
ꢏꢝ
ꢏꢞ
ꢘ
�ꢀ
�ꢁ
ꢂꢀ
ꢂꢁ
ꢃꢀ
ꢃꢁ
ꢗꢞꢞꢇꢊꢉꢢ
ꢝꢞꢞꢇꢊꢉꢢ
ꢀ
ꢉꢊꢆꢁꢂꢃꢄꢀ
ꢄꢀ
ꢄꢁ
ꢀꢀ
ꢀꢁ
ꢅꢀ
ꢕꢂꢐꢣꢁꢂꢊꢇꢤꢋꢃꢅꢆꢥꢐꢈꢋꢃ
ꢀ
ꢉꢊꢆꢁꢂꢇꢈꢀ
ꢟ
ꢀ
ꢉꢊꢆꢁꢂꢅꢆꢀ
ꢗ
ꢝ
ꢅꢁ
ꢆꢆꢆ ꢇꢆ
ꢞ
ꢅꢆ
ꢄꢆ
ꢂꢆ
ꢈꢁꢆ
ꢈꢇꢆ
ꢈꢅꢆ
ꢈꢄꢆ
ꢈꢂꢆ
ꢇꢁ
ꢕꢗꢚꢜꢋꢝꢞꢟꢟꢐꢑꢙꢋꢢꢣꢤꢥꢔꢦ
ꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘꢌꢟ�ꢖꢠ
Start-Up from VIN
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
+Input (pin 3)
20V/div
1V/div
2.5VOUT (pin 8)
2msec/div
Start-Up from Remote On/Off Control
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
Remote On/Off Control(pin 2)
2V/div
1V/div
2.5VOUT (pin 8)
2msec/div
14
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
Typical Performance Curves for 3.3VOUT Models
�ꢀꢁꢂꢃꢄꢃꢅꢆꢇꢂꢈꢉꢊꢋꢌꢍꢎꢏꢐꢑꢒꢑꢌꢓꢒꢔꢕꢒꢔꢌꢖꢒꢗꢗꢘꢙꢔꢌꢚꢛꢄꢌꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘ
�ꢀꢁꢂꢃꢄꢅꢆꢁꢄꢆꢇꢂꢈꢁꢇꢉꢊꢋꢌꢍꢇꢎꢈꢃꢇꢏꢇꢐꢋꢇꢎꢈꢃꢇꢑꢒꢇꢓꢔꢕꢇꢖꢇꢗꢘꢓꢍꢇꢃꢋꢇꢙꢆꢂꢐꢇꢄꢈꢃꢚꢛꢜ
�ꢀꢁꢂꢃꢄꢃꢅꢆꢇꢂꢈꢉꢊꢋꢌꢍꢍꢎꢏꢎꢐꢑꢏꢒꢋꢓꢔꢄꢋꢕꢎꢑꢐꢋꢖꢗꢘꢙꢚꢛꢐꢅꢕꢗꢚꢜꢋꢝꢞꢟꢟꢐꢑ ꢋ ꢋꢆꢡꢢꢝ
�ꢀ
ꢝꢝ
ꢝꢞ
ꢏꢘ
ꢏꢟ
ꢏꢗ
ꢏꢝ
ꢏꢞ
ꢘ
�ꢁ
ꢂꢀ
ꢂꢁ
ꢃꢀ
ꢃꢁ
ꢄꢀ
ꢄꢁ
ꢝꢞꢞꢇꢊꢉꢧ
ꢗꢞꢞꢇꢊꢉꢧ
ꢟꢞꢞꢇꢊꢉꢧ
ꢀ
ꢋꢌꢅꢁꢂꢃꢄꢀ
ꢀ
ꢋꢌꢅꢁꢂꢇꢈꢀ
ꢤꢋꢌꢇꢤꢥꢦ
ꢀ
ꢋꢌꢅꢁꢂꢅꢆꢀ
ꢟ
ꢗ
ꢝ
ꢀꢀ
ꢅꢅꢅꢆꢇꢆꢅ
ꢞ
ꢠꢗꢞꢇ
ꢈꢇꢈꢅ
ꢄꢇꢃꢅ
ꢂꢇ�ꢅ
ꢉꢉꢇꢉꢅ
ꢉꢊꢇꢊꢅ
ꢉꢀꢇꢄꢅ
ꢉꢃꢇꢂꢅ
ꢆꢁꢅ
ꢠꢏꢞꢇ
ꢞꢇ
ꢏꢞꢇ
ꢝꢞꢇ
ꢑꢞꢇ
ꢗꢞꢇ
ꢡꢞꢇ
ꢟꢞꢇ
ꢢꢞꢇ
ꢘꢞꢇ
ꢣꢞꢇ
ꢏꢞꢞ
ꢐꢟꢟ
ꢐꢢꢢ
ꢕꢗꢚꢜꢋꢝꢞꢟꢟꢐꢑꢙꢋꢣꢤꢥꢦꢔꢧ
ꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘꢌꢟ�ꢖꢠ
�ꢀꢁꢂꢃꢄꢃꢅꢆꢇꢂꢈꢉꢊꢋꢌꢍꢎꢏꢐꢑꢒꢑꢌꢓꢒꢔꢕꢒꢔꢌꢖꢒꢗꢗꢘꢙꢔꢌꢚꢛꢄꢌꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘ
�ꢀꢁꢂꢃꢄꢅꢆꢇꢄꢂꢈꢉꢊꢈꢄꢋꢊꢌꢉꢁꢍꢎꢊꢏꢄꢂꢊꢐꢊꢅꢁꢊꢏꢄꢂꢊꢑꢒꢊꢓꢔꢕꢊꢖꢊꢑꢗꢓꢎꢊꢂꢁꢊꢘꢙꢈꢅꢊꢚꢄꢂꢛꢜꢝ
Start-Up from VIN
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
ꢞꢞ
ꢞꢟ
ꢐꢗ
ꢐꢠ
ꢐꢑ
ꢐꢞ
ꢐꢟ
ꢗ
ꢠꢟꢟꢊꢉꢌꢩ
+Input (pin 3)
ꢞꢟꢟꢊꢉꢌꢩ
ꢑꢟꢟꢊꢉꢌꢩ
20V/div
ꢕꢈꢅꢆꢋꢈꢉꢊꢦꢁꢂꢧꢙꢨꢅꢄꢁꢂ
ꢠ
3.3VOUT (pin 8)
1V/div
ꢑ
ꢞ
ꢟ
ꢡꢑꢟꢊ
ꢡꢐꢟꢊ
ꢟꢊ
ꢐꢟꢊ
ꢞꢟꢊ
ꢢꢟꢊ
ꢑꢟꢊ
ꢣꢟꢊ
ꢠꢟꢊ
ꢤꢟꢊ
ꢗꢟꢊ
ꢥꢟꢊ
2msec/div
ꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘꢌꢟ�ꢖꢠ
Start-Up from Remote On/Off Control
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
�ꢀꢁꢂꢃꢄꢃꢅꢆꢇꢂꢈꢉꢊꢋꢌꢍꢎꢏꢐꢑꢒꢑꢌꢓꢒꢔꢕꢒꢔꢌꢖꢒꢗꢗꢘꢙꢔꢌꢚꢛꢄꢌꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘ
�ꢀꢁꢂꢃꢄꢅꢆꢇꢄꢂꢈꢉꢊꢈꢄꢋꢊꢌꢉꢁꢍꢎꢊꢏꢄꢂꢊꢐꢊꢅꢁꢊꢏꢄꢂꢊꢑꢒꢊꢓꢔꢕꢊꢖꢊꢗꢘꢓꢎꢊꢐꢙꢗꢚꢊꢛꢜꢈꢅꢊꢝꢄꢂꢞꢟꢠ
ꢡꢡ
ꢡꢢ
ꢐꢘ
ꢐꢣ
ꢐꢗ
ꢐꢡ
ꢐꢢ
ꢘ
ꢡꢢꢢꢊꢉꢌꢨ
Remote On/Off Control (pin 2)
2V/div
ꢗꢢꢢꢊꢉꢌꢨ
3.3VOUT (pin 8)
ꢣ
1V/div
ꢗ
ꢡ
ꢢ
ꢤꢗꢢꢊ
ꢤꢐꢢꢊ
ꢢꢊ
ꢐꢢꢊ
ꢡꢢꢊ
ꢑꢢꢊ
ꢗꢢꢊ
ꢥꢢꢊ
ꢣꢢꢊ
ꢦꢢꢊ
ꢘꢢꢊ
ꢧꢢꢊ
2msec/div
ꢜꢑꢝꢐꢘꢙꢔꢌꢞꢘꢑꢕꢘꢗꢎꢔꢒꢗꢘꢌꢟ�ꢖꢠ
15
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
Typical Performance Curves for 5VOUT Models
�ꢀꢁꢂꢃꢄꢅꢆꢂꢇꢈꢉꢊꢋꢌꢍꢎꢏꢐꢑꢐꢋꢒꢑꢓꢔꢑꢓꢋꢕꢑꢖꢖꢗꢘꢓꢋꢙꢚꢛꢋꢜꢐꢝꢏꢗꢘꢓꢋꢞꢗꢐꢔꢗꢖꢍꢓꢑꢖꢗ
�ꢀꢁꢂꢃꢄꢅꢆꢁꢄꢆꢇꢂꢈꢁꢇꢉꢊꢋꢌꢍꢇꢎꢈꢃꢇꢏꢇꢐꢋꢇꢎꢈꢃꢇꢑꢒꢇꢓꢔꢕꢇꢖꢇꢗꢘꢓꢍꢇꢃꢋꢇꢙꢆꢂꢐꢇꢄꢈꢃꢚꢛꢜ
�ꢀꢁꢂꢃꢄꢅꢆꢂꢇꢈꢉꢊꢋꢌꢌꢍꢎꢍꢏꢐꢎꢑꢊꢒꢓꢔꢊꢕꢍꢐꢏꢊꢖꢗꢘꢙꢚꢛꢏꢄꢕꢗꢚꢜꢊꢝꢞꢟꢟꢏꢐ ꢊ ꢊꢅꢃꢡꢝ
ꢝꢝ
ꢝꢞ
ꢏꢘ
ꢏꢟ
ꢏꢗ
ꢏꢝ
ꢏꢞ
ꢘ
�ꢀ
�ꢁ
ꢂꢀ
ꢂꢁ
ꢃꢀ
ꢃꢁ
ꢄꢀ
ꢝꢞꢞꢇꢊꢉꢤ
ꢗꢞꢞꢇꢊꢉꢤ
ꢟꢞꢞꢇꢊꢉꢤ
ꢀ
ꢉꢊꢅꢁꢂꢃꢄꢀ
ꢀ
ꢉꢊꢅꢁꢂꢇꢈꢀ
ꢥꢋꢌꢇꢥꢦꢧ
ꢟ
ꢀ
ꢉꢊꢅꢁꢂꢅꢆꢀ
ꢗ
ꢝ
ꢄꢁ
ꢅꢅꢅ ꢆꢅ
ꢞ
ꢠꢗꢞꢇ
ꢇꢅ
ꢄꢅ
ꢂꢅ
ꢈꢁꢅ
ꢈꢆꢅ
ꢈꢇꢅ
ꢈꢄꢅ
ꢈꢂꢅ
ꢆꢁ
ꢠꢏꢞꢇ
ꢞꢇ
ꢏꢞꢇ
ꢝꢞꢇ
ꢑꢞꢇ
ꢗꢞꢇ
ꢡꢞꢇ
ꢟꢞꢇ
ꢢꢞꢇ
ꢘꢞꢇ
ꢣꢞꢇ
ꢏꢞꢞ
ꢕꢗꢚꢜꢊꢝꢞꢟꢟꢏꢐꢙꢊꢢꢣꢤꢥꢓꢦ
ꢜꢐꢝꢏꢗꢘꢓꢋꢞꢗꢐꢔꢗꢖꢍꢓꢑꢖꢗꢋꢟ�ꢕꢠ
�ꢀꢁꢂꢃꢄꢅꢆꢂꢇꢈꢉꢊꢋꢌꢍꢎꢏꢐꢑꢐꢋꢒꢑꢓꢔꢑꢓꢋꢕꢑꢖꢖꢗꢘꢓꢋꢙꢚꢛꢋꢜꢐꢝꢏꢗꢘꢓꢋꢞꢗꢐꢔꢗꢖꢍꢓꢑꢖꢗ
�ꢀꢁꢂꢃꢄꢅꢆꢁꢄꢆꢇꢂꢈꢁꢇꢉꢊꢋꢌꢍꢇꢎꢈꢃꢇꢏꢇꢐꢋꢇꢎꢈꢃꢇꢑꢒꢇꢓꢔꢕꢇꢖꢇꢗꢘꢓꢍꢇꢏꢙꢗꢚꢇꢛꢆꢂꢐꢇꢄꢈꢃꢜꢝꢞ
Start-Up from VIN
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
ꢟꢟ
ꢟꢠ
ꢏꢘ
ꢏꢡ
ꢏꢗ
ꢏꢟ
ꢏꢠ
ꢘ
+Input (pin 3)
ꢟꢠꢠꢇꢊꢉꢦ
20V/div
ꢗꢠꢠꢇꢊꢉꢦ
ꢡꢠꢠꢇꢊꢉꢦ
ꢡ
5VOUT (pin 8)
1V/div
ꢗ
ꢟ
ꢠ
ꢢꢗꢠꢇ
ꢢꢏꢠꢇ
ꢠꢇ
ꢏꢠꢇ
ꢟꢠꢇ
ꢑꢠꢇ
ꢗꢠꢇ
ꢣꢠꢇ
ꢡꢠꢇ
ꢤꢠꢇ
ꢘꢠꢇ
ꢥꢠꢇ
ꢏꢠꢠ
2msec/div
ꢜꢐꢝꢏꢗꢘꢓꢋꢞꢗꢐꢔꢗꢖꢍꢓꢑꢖꢗꢋꢟ�ꢕꢠ
Start-Up from Remote On/Off Control
(VIN = 48V, IOUT = 20A, COUT = 10µF tantalum || 1µF ceramic.)
�ꢀꢁꢂꢃꢄꢅꢆꢂꢇꢈꢉꢊꢋꢌꢍꢎꢏꢐꢑꢐꢋꢒꢑꢓꢔꢑꢓꢋꢕꢑꢖꢖꢗꢘꢓꢋꢙꢚꢛꢋꢜꢐꢝꢏꢗꢘꢓꢋꢞꢗꢐꢔꢗꢖꢍꢓꢑꢖꢗ
�ꢀꢁꢂꢃꢄꢅꢆꢇꢄꢂꢈꢉꢊꢈꢄꢋꢊꢌꢉꢁꢍꢎꢊꢏꢄꢂꢊꢐꢊꢅꢁꢊꢏꢄꢂꢊꢑꢒꢊꢓꢔꢕꢊꢖꢊꢑꢗꢓꢎꢊꢂꢁꢊꢘꢙꢈꢅꢊꢚꢄꢂꢛꢜꢝ
ꢞꢞ
ꢞꢟ
ꢐꢗ
ꢐꢠ
ꢐꢑ
ꢐꢞ
ꢐꢟ
ꢗ
ꢠꢟꢟꢊꢉꢌꢩ
Remote On/Off Control (pin 2)
ꢑꢟꢟꢊꢉꢌꢩ
ꢞꢟꢟꢊꢉꢌꢩ
5V/div
ꢕꢈꢅꢆꢋꢈꢉꢊꢦꢁꢂꢧꢙꢨꢅꢄꢁꢂ
5VOUT (pin 8)
ꢠ
1V/div
ꢑ
ꢞ
ꢟ
ꢡꢑꢟꢊ
ꢡꢐꢟꢊ
ꢟꢊ
ꢐꢟꢊ
ꢞꢟꢊ
ꢢꢟꢊ
ꢑꢟꢊ
ꢣꢟꢊ
ꢠꢟꢊ
ꢤꢟꢊ
ꢗꢟꢊ
ꢥꢟꢊ
ꢐꢟꢟ
2msec/div
ꢜꢐꢝꢏꢗꢘꢓꢋꢞꢗꢐꢔꢗꢖꢍꢓꢑꢖꢗꢋꢟ�ꢕꢠ
16
ꢟꢠꢇ
ꢟꢢꢇ
ꢑꢠꢇ
ꢑꢢꢇ
ꢗꢠꢇ
ꢗꢢꢇ
ꢢꢠꢇ
ꢢꢢꢇ
ꢡꢠꢇ
ꢡꢢꢇ
ꢣꢠꢇ
ꢣꢢꢇ
ꢘꢠꢇ
ꢘꢢ
ꢠꢡꢊ
ꢠꢣꢊ
ꢤꢡꢊ
ꢤꢣꢊ
ꢑꢡꢊ
ꢑꢣꢊ
ꢣꢡꢊ
ꢣꢣꢊ
ꢢꢡꢊ
ꢢꢣꢊ
ꢥꢡꢊ
ꢥꢣꢊ
ꢗꢡꢊ
ꢗꢣ
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
Typical Performance Curves for 5VOUT Models
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�ꢀꢁꢂꢃꢄꢅꢆꢇꢄꢂꢈꢉꢊꢈꢄꢋꢊꢌꢉꢁꢍꢎꢊꢏꢄꢂꢊꢐꢊꢅꢁꢊꢏꢄꢂꢊꢑꢒꢊꢓꢔꢕꢊꢖꢊꢑꢗꢓꢎꢊꢐꢘꢑꢙꢊꢚꢛꢈꢅꢊꢜꢄꢂꢝꢞꢟ
ꢠꢠ
ꢠꢡ
ꢐꢗ
ꢐꢢ
ꢐꢑ
ꢐꢠ
ꢐꢡ
ꢗ
ꢢꢡꢡꢊꢉꢌꢦ
ꢑꢡꢡꢊꢉꢌꢦ
ꢠꢡꢡꢊꢉꢌꢦ
ꢢ
ꢑ
ꢠ
ꢡ
ꢜꢐꢝꢏꢗꢘꢓꢋꢞꢗꢐꢔꢗꢖꢍꢓꢑꢖꢗꢋꢟ�ꢕꢠ
�ꢀꢁꢂꢃꢄꢅꢆꢂꢇꢈꢉꢊꢋꢌꢍꢎꢏꢐꢑꢐꢋꢒꢑꢓꢔꢑꢓꢋꢕꢑꢖꢖꢗꢘꢓꢋꢙꢚꢛꢋꢜꢐꢝꢏꢗꢘꢓꢋꢞꢗꢐꢔꢗꢖꢍꢓꢑꢖꢗ
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ꢟꢟ
ꢟꢠ
ꢏꢘ
ꢏꢡ
ꢏꢗ
ꢏꢟ
ꢏꢠ
ꢘ
ꢡꢠꢠꢇꢊꢉꢤ
ꢗꢠꢠꢇꢊꢉꢤ
ꢟꢠꢠꢇꢊꢉꢤ
ꢡ
ꢗ
ꢟ
ꢠ
ꢜꢐꢝꢏꢗꢘꢓꢋꢞꢗꢐꢔꢗꢖꢍꢓꢑꢖꢗꢋꢟ�ꢕꢠ
17
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
Typical Performance Curves for 12VOUT Models
USQ-12/8.3-D48: Output Current vs. Ambient Temperature
(Transverse air flow, pin 1 to pin 3; VIN = 48V, no heat sink.)
USQ-12/8.3-D48 Efficiency vs. Line Voltage and Load Current
9
8
7
6
5
4
3
2
1
0
95
90
85
80
75
70
65
60
55
600 lfm
400 lfm
200 lfm
V
IN = 36V
Natural Convection
V
IN = 48V
V
IN = 75V
0.83
1.66
2.49
3.32
4.15
4.98
5.81
6.64
7.47
8.3
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Load Current (Amps)
Ambient Temperature (°C)
USQ-12/8.3-D48: Output Current vs. Ambient Temperature
(Longitudinal air flow, pin 1 to pin 3; VIN = 48V, no heat sink.)
Start-Up from VIN
(VIN = 48V, IOUT = 8.3A, COUT = 10µF tantalum || 1µF ceramic.)
10
8
6
4
2
0
+Input (pin 3)
200 lfm
400 lfm
20V/div
600 lfm
Natural Convection
12VOUT (pin 8)
5V/div
–40
–10
0
10
20
30
40
50
60
70
80
90
100
2msec/div
Ambient Temperature (°C)
The USQ Series 12V models are discontinued.These Performance
Curves are for documentation purposes only. Refer to DATEL's
ULQ or UVQ series for alternate models.
18
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
Typical Performance Curves for 12VOUT Models
USQ-12/8.3-D24: Output Current vs. Ambient Temperature
(Transverse air flow, pin 1 to pin 3; VIN = 24V, no heat sink.)
Start-Up from Remote On/Off Control
(VIN = 48V, IOUT = 8.3A, COUT = 10µF tantalum || 1µF ceramic.)
9
8
7
6
5
4
3
2
1
0
Remote On/Off Control (pin 2)
2V/div
600 lfm
400 lfm
200 lfm
Natural Convection
12VOUT (pin 8)
5V/div
20
25
30
35
40
45
50
55
60
65
70
75
80
85
2msec/div
Ambient Temperature (°C)
USQ-12/8.3-D24: Output Current vs. Ambient Temperature
(Transverse air flow, pin 1 to pin 3; VIN = 24V, 1/2" heat sink.)
9
8
7
6
5
4
3
2
1
0
400 lfm
200 lfm
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (°C)
The USQ Series 12V models are discontinued.These Performance
Curves are for documentation purposes only. Refer to DATEL's
ULQ or UVQ series for alternate models.
19
ꢠꢡꢇ
ꢠꢟꢇ
ꢑꢡꢇ
ꢑꢟꢇ
ꢗꢡꢇ
ꢗꢟꢇ
ꢟꢡꢇ
ꢟꢟꢇ
ꢞꢡꢇ
ꢞꢟꢇ
ꢝꢡꢇ
ꢝꢟꢇ
ꢘꢡꢇ
ꢘꢟ
ꢅꢅꢁꢆꢄꢃꢅ ꢇꢆꢈꢉꢅ ꢊꢆꢁꢇꢅ ꢊꢆꢄꢂꢅ ꢈꢆꢈꢀꢅ ꢉꢆꢁꢊꢅ ꢉꢆꢄ�ꢅ ꢀꢆꢈꢄꢅ ꢄꢆꢁꢈꢅ
ꢄꢆꢃ
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
Typical Performance Curves for 15VOUT Models
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ꢝ
ꢞ
ꢟ
ꢗ
ꢑ
ꢠ
ꢏ
ꢡ
�ꢀ
�ꢁ
ꢂꢀ
ꢂꢁ
ꢃꢀ
ꢗꢡꢡꢇꢊꢉꢢ
ꢠꢡꢡꢇꢊꢉꢢ
ꢀ
ꢋꢌꢅꢁꢂꢃꢄꢀ
ꢕꢂꢐꢣꢁꢂꢊꢇꢤꢋꢃꢅꢆꢥꢐꢈꢋꢃ
ꢃꢁ
ꢄꢀ
ꢄꢁ
ꢀꢀ
ꢀꢁ
ꢀ
ꢋꢌꢅꢁꢂꢇꢈꢀ
ꢀ
ꢋꢌꢅꢁꢂꢅꢆꢀ
ꢖꢘꢛꢝꢌꢞꢟꢠꢠꢑꢒꢚꢌꢤꢥꢦꢧꢕꢨ
ꢝꢒꢞꢑꢙꢚꢕꢍꢟꢙꢒꢖꢙꢘꢏꢕꢓꢘꢙꢍꢠ�ꢗꢡ
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Start-Up from Remote On/Off Control
(VIN = 48V, IOUT = 6.7A, COUT = 10µF tantalum || 1µF ceramic.)
ꢘ
Remote On/Off Control (pin 2)
ꢟ
ꢗ
ꢠ
ꢡ
2V/div
ꢠꢡꢡꢊꢉꢌꢩ
ꢗꢡꢡꢊꢉꢌꢩ
ꢟꢡꢡꢊꢉꢌꢩ
ꢕꢈꢅꢆꢋꢈꢉꢊꢦꢁꢂꢧꢚꢨꢅꢄꢁꢂ
15VOUT (pin 8)
5V/div
ꢢꢗꢡꢊ
ꢢꢐꢡꢊ
ꢡꢊ
ꢐꢡꢊ
ꢠꢡꢊ
ꢑꢡꢊ
ꢗꢡꢊ
ꢣꢡꢊ
ꢟꢡꢊ
ꢤꢡꢊ
ꢘꢡꢊ
ꢥꢡꢊ
ꢐꢡꢡ
2msec/div
ꢝꢒꢞꢑꢙꢚꢕꢍꢟꢙꢒꢖꢙꢘꢏꢕꢓꢘꢙꢍꢠ�ꢗꢡ
Start-Up from VIN
(VIN = 48V, IOUT = 6.7A, COUT = 10µF tantalum || 1µF ceramic.)
+Input (pin 3)
20V/div
15VOUT (pin 8)
5V/div
2msec/div
20
ꢞꢟꢇ
ꢞꢝꢇ
ꢑꢟꢇ
ꢑꢝꢇ
ꢗꢟꢇ
ꢗꢝꢇ
ꢝꢟꢇ
ꢝꢝꢇ
ꢠꢟꢇ
ꢠꢝꢇ
ꢡꢟꢇ
ꢡꢝꢇ
ꢘꢟꢇ
ꢘꢝ
ꢅꢅꢁꢆꢇꢈꢅ ꢁꢆꢂꢇꢅ ꢉꢆꢈꢄꢅ ꢉꢆꢄꢂꢅ
ꢈꢆꢉꢅ
ꢈꢆꢀꢈꢅ ꢈꢆ�ꢇꢅ ꢊꢆꢊꢄꢅ ꢊꢆꢃꢂꢅ
ꢇꢆꢈ
ꢗꢞꢇ
ꢗꢝꢇ
ꢑꢞꢇ
ꢑꢝꢇ
ꢘꢞꢇ
ꢘꢝꢇ
ꢝꢞꢇ
ꢝꢝꢇ
ꢟꢞꢇ
ꢟꢝꢇ
ꢠꢞꢇ
ꢠꢝꢇ
ꢡꢞꢇ
ꢡꢝ
ꢅꢅꢁꢆꢇꢈꢅ ꢁꢆꢂꢇꢅ ꢉꢆꢈꢄꢅ ꢉꢆꢄꢂꢅ
ꢈꢆꢉꢅ
ꢈꢆꢀꢈꢅ ꢈꢆ�ꢇꢅ ꢊꢆꢊꢄꢅ ꢊꢆꢃꢂꢅ
ꢇꢆꢈ
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Models
Typical Performance Curves for 24VOUT Models
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Start-Up from Remote On/Off Control
(VIN = 48V, IOUT = 4.2A, COUT = 10µF tantalum || 1µF ceramic.)
Start-Up from VIN
(VIN = 48V, IOUT = 4.2A, COUT = 10µF tantalum || 1µF ceramic.)
Remote On/Off Control (pin 2)
+Input (pin 3)
20V/div
2V/div
24VOUT (pin 8)
24VOUT (pin 8)
10V/div
10V/div
2msec/div
2msec/div
21
2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S
USQ Series
–Input
–Output
+Input
+Output
X
–Sense
Output Trim
+Sense
Output Trim
Remote
On/Off
Remote On/Off
+Input
LOCATE
THERMOCOUPLE
HERE
+Sense
+Output
–Sense
–Output
–Input
BOTTOM VIEW
TOP VIEW
Figure 21.Thermocouple Placement forTemperature Derating Calculations
Figure 20. Industry Standard Quarter-Brick Pinout
The typical derating curves on the previous pages were developed by moni-
toring the temperature of the case with a thermocouple placed on top of
the USQ case as shown in Figure 21. Users desiring to model their own
application's temperature derating for a particular environment (enclosed
area, orientation, airflow, possible heatsinking) should make sure the case
temperature does not exceed 110°C for any condition.
Figure 20 readily allows users to confirm that DATEL quarter-brick DC/DC
converters are compatible to the industry-standard pinout, independent of
pin-numbering conventions.
®
®
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
Internet: www.datel-europe.com E-mail: datel.ltd@datel.com
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
Internet: www.datel-europe.com E-mail: datel.sarl@datel.com
A SUBSIDIARY OF C&D TECHNOLOGIES
DATEL GmbH München, Germany Tel: 89-544334-0
Internet: www.datel-europe.com E-mail: datel.gmbh@datel.com
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025
Internet: www.datel.co.jp Email: salestko@datel.co.jp, salesosa@datel.co.jp
www.datel.com
Email: sales@datel.com
www.cdpowerelectronics.com
DATEL China Shanghai, China Tel: 011-86-51317131
E-mail: davidx@datel.com
DS-0493D
10/04
ISO 9001 REGISTERED
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
22
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