®
®
INNOVATION and EXCELLENCE
Single Output
UHP Series
Open-Frame, Low V
OUT
to 60A
Half-Brick, DC/DC Converters
Features
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■
■
■
■
■
■
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1.5/1.8/2.5/3.3V outputs @ up to 60 Amps
Input range: 36V-75V
Open frame: 2.3" x 2.4" x 0.42"
Industry-standard package/pinout
Light weight: 2.24 ounces (63.5g)
Remote sense, Trim, On/Off Control
High efficiency: 89%
Fully isolated, 2250Vdc (BASIC)
Input undervoltage shutdown
Output overvoltage protection
Short circuit protection; thermal shutdown
UL60950 and EN60950 safety approvals
CE mark
DATEL's fully isolated UHP series of DC/DC converters affords users a practical
solution for their low-voltage/high-current applications. With an input voltage range of
36 to 75 Volts, the UHP Series delivers up to 60 Amps of output current from a fully
regulated 1.5V or 1.8V output, or 50 Amps of 2.5V and 45 Amps of 3.3V. Using
both surface-mount technology and planar magnetics, these converters are manu-
factured on a 2.3" x 2.4" open-frame package with an industry-standard pinout
configuration.
UHP converters utilize a full-bridge, fixed-frequency topology along with syn-
chronous output rectification to achieve a high efficiency of 89%. This efficiency,
coupled with the open-frame package that allows unrestricted air flow, reduces
internal component temperatures thereby allowing operation at elevated ambient
temperatures.
These DC/DC's provide output trim, sense pins and primary side on/off control
(available with positive or negative logic) or sync. Standard features also include
input undervoltage shutdown circuitry, output overvoltage protection, output short-
circuit and current limiting protection and thermal shutdown. All devices meet
IEC/UL/EN60950 safety standards and carry the CE mark (meet LVD requirements).
CB reports are available on request.
+INPUT
(4)
+OUTPUT
(5)
OUTPUT
RETURN
(9)
SECONDARY
SWITCH
CONTROL
PRIMARY
SWITCH
CONTROL
–INPUT
(1)
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
+SENSE
(6)
–SENSE
(8)
UV & OV
COMPARATORS
ON/OFF
CONTROL/
SYNC
(3)
THERMAL
SHUTDOWN
TRIM
(7)
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
XHP Series
4 0 - 6 0 A M P, 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
Performance Specifications and Ordering Guide
Output
Model
UHP-1.5/60-D48
UHP-1.8/60-D48
UHP-2.5/50-D48
UHP-3.3/45-D48
➀
➁
➂
➃
➀
Input
Regulation (Max.)
Line
±0.5%
±0.5%
±0.5%
±0.5%
V
OUT
(Volts)
1.5
1.8
2.5
3.3
I
OUT
➁
(Amps)
60
60
50
45
R/N (mVp-p)
➁
Typ.
100
120
80
150
Max.
150
150
120
190
Load
➂
±0.5%
±0.5%
±0.5%
±1%
V
IN
Nom.
(Volts)
48
48
48
48
Range
(Volts)
36-75
36-75
36-75
36-75
I
IN
➃
(mA/A)
150/2.4
140/2.7
120/3.2
120/3.6
Efficiency
Full Load
82.5%
83%
84%
87%
½ Load
86.5%
87%
87.5%
89%
Package
(Case,
Pinout)
C27, P53
C27, P53
C27, P53
C27, P53
Typical at T
A
= +25°C under nominal line voltage and full-load conditions.
Ripple/Noise (R/N) measured over a 20MHz bandwidth with 10µF tantalum and 1µF ceramic output capacitors.
Tested from no load to 100% load.
Nominal line voltage, no load/full load condition.
PA R T N U M B E R S T R U C T U R E
UHP
-
1.8
/
60
-
D48 N Lx
Unipolar
High-Power Series
Optional Functions
Nominal Output Voltage:
1.5, 1.8, 2.5, 3.3 Volts
Maximum Output Current:
60 Amps
Input Voltage Range:
D48
= 36-75 Volts (48V nominal)
Optional Functions
UHP Series DC/DC's are designed so a negative logic
on/off control ("N" suffix) or a Sync function ("S" suffix) can be
added in the pin 3 position.
Blank
N
S
L1
L2
On/Off Control function (positive polarity)
Negative polarity on/off control (pin 3)
Sync function (excludes On/Off Control)
Pin length: 0.110 in. (2.79mm) ±0.010
Pin length: 0.145 in. (3.68mm) ±0.010
M E C H A N I C A L S P E C I F I C AT I O N S
2.30
(58.42)
0.42 MAX.
(10.67)
0.160 MIN.
(4.06)
PLASTIC STANDOFFS
ARE RELIEVED 0.030 (0.76)
IN SOLDER JOINT AREA
PIN DIAMETERS:
PINS 1-4, 6-8 0.040 ±0.002 (1.016 ±0.051
PINS 5, 9
0.080 ±0.002 (2.032 ±0.051
0.20
(5.08)
I/O Connections
Pin
1
2
3
4
5
6
7
8
9
Function P53
–Input
No Pin
On/Off Control
+Input
+Output
+Sense
Trim
–Sense
–Output
1.900
(48.26)
1
9
8
Case C27
3
7
6
0.400
(10.16)
0.700
(17.78)
1.000
(25.40)
1.400
(35.56)
2.40
(60.96)
4
5
0.50
(12.70)
BOTTOM VIEW
DIMENSIONS ARE IN INCHES (MM)
2
4 0 - 6 0 A M P, S I N G L E O U T P U T C O N V E R T E R S
UHP Models
Dynamic Characteristics (continued)
Start-Up Time:
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
MTBF
➆
Operating Temperature
(Ambient):
➁
Without Derating (400lfm)
1.5V Output
1.8V Output
2.5V Output
3.3V Output
With Derating
Thermal Shutdown
Storage Temperature
Dimensions
Pin Material
Weight:
10msec
10msec
250kHz (±30kHz
)
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, full-load conditions, unless noted.
➀
Input
Input Voltage Range
Overvoltage Shutdown
Start-Up Threshold
Undervoltage Shutdown
Input Current:
Normal Operating Conditions
Standby Mode:
Off, UV, Thermal Shutdown
Input Reflected Ripple Current
➃
Internal Input Filter Type
Reverse-Polarity Protection
On/Off Control
(Pin 3):
➂ ➅
36-75 Volts (48V nominal)
None (see Absolute Max. Ratings)
31-35 Volts (33V typical)
30-33 Volts (31.5V typical)
See Ordering Guide
10mA typical
5mAp-p
Pi (0.47µF - 1.5µH - 3.3µF)
None (see Absolute Max. Ratings)
On = open or 3.5V to +V
IN
,
I
IN
= less than 50µA
Off = 0 to 0.8V, I
IN
= 200µA @ 0V
On = 0 to 0.8V, I
IN
= TBD @ 0V
Off = open or 3.5V to +V
IN
500kHz
2 Volts
5 Volts
4.35kΩ || 33pF
2.6 Volts
400µA @ 2.6V
85 nsec
Environmental
TBD million hours
TBD
+36°C
TBD
+35°C
See Derating Curves
125°C
–55 to +125°C
Physical
2.3" x 2.4" x 0.42" (58.4 x 61 x 10.6mm)
Copper, solder coated
2.24 ounces (63.5 grams)
"N" Suffix Models
Sync
(Option, Pin 3):
➂
Input Threshold
Input Voltage Low
Input Voltage High
Input Impedance
Output High Voltage (100µA load)
Output Drive Current
Input/Output Pulse Width
V
OUT
Accuracy:
Minimum Loading Per Specification
Ripple/Noise
(20MHz BW)
➄
Line/Load Regulation
Efficiency
Output Voltage Sense Range
Trim Range:
➁
3.3V Output
1.5, 1.8, 2.5V Output
Isolation Voltage:
Input-to-Output
Isolation Resistance
Isolation Capacitance
Current Limit Inception:
97% V
OUT
Short Circuit Current:
Overvoltage Protection:
1.5V Output
1.8V Output
2.5V Output
3.3V Output
Capacitive Loading Tested To
Temperature Coefficient
Dynamic Load Response:
1.5V (50-75% load step to 1% V
OUT
)
1.8V (50-75% load step to 1% V
OUT
)
2.5V (50-75% load step to 1% V
OUT
)
3.3V (50-75% load step to 1% V
OUT
)
Primary to Secondary Insulation Level
Basic
➀
All models are specified with external 10µF tantalum and 1µF ceramic output capacitors.
➁
See Technical Notes/Graphs for details.
➂
The On/Off Control function can be replaced with a Sync function. See Part Number
Suffixes and Technical Notes for details.
➃
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 Noiose for details.
➄
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
➅
On/Off control is designed to be driven with open collector or by appropriate voltage
levels. Voltages must be referenced to the –Input (pin 1).
➆
MTBF’s are calculated using Telcordia (Bellcore), ground fixed conditions, +25°C ambient air,
and full-load conditions. Contact DATEL for demonstrated life-test data.
Output
±1.0% maximum
No load
See Ordering Guide
See Ordering Guide
See Ordering Guide
5% (10% for 3.3V models)
±10%
±5/%
2250Vdc minimum
100MΩ
940pF
110% I
OUT
TBD Amps average current
Comparator, hiccup
1.7 Volts
2 Volts
2.8 Volts
4.2 Volts
50,000µF
±0.02% per °C
Absolute Maximum Ratings
Input Voltage:
Continuous:
Transient (100msec):
Input Reverse-Polarity Protection
Output Current
On/Off Control (Pin 3) Max. Voltages
Referenced to –Input (pin 1)
Storage Temperature
Lead Temperature
(Soldering, 10 sec.)
81 Volts
100 Volts
None. (Input Current must be <1.5A
all the time.)
Current limited. Devices can withstand
an indefinite output short circuit.
+V
IN
–55 to +125°C
+300°C
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.
Dynamic Characteristics
250µsec maximum
250µsec maximum
250µsec maximum
250µsec maximum
3
XHP Series
4 0 - 6 0 A M P, 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
TECHNICAL NOTES
Input Overvoltage Shutdown
The UHP Series does not feature input overvoltage shutdown. The converters
do withstand and fully operate during input transients to 100V for 100msec
without interruption; consequently, this function has been disabled. Please
contact DATEL to have input overvoltage shutdown enabled.
Input Source Impedance
The input of UHP converters must be driven from a low ac-impedance
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 as close as possible to the DC/DC converter.
I/O Filtering, Input Ripple Current, and Output Noise
All models in the UHP Series are tested/specified for input reflected
ripple current and output noise using the specified external input/output
components/circuits and layout as shown in the following two figures.
External input capacitors (C
IN
in Figure 2) serve primarily as energy-storage
elements, minimizing line voltage variations caused by transient IR drops
in conductors from backplane to the DC/DC. Input caps 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 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.
Input Fusing
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 sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL UHP Series DC/DC Converters, we recommend
the use of slow-blow type fuses, installed in the ungrounded input supply line,
with values no greater than the following.
Output
1.5 V
OUT
1.8 V
OUT
2.5 V
OUT
3.3 V
OUT
Fuse Value
TBD Amp
TBD Amp
TBD Amp
TBD Amp
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the
converters must be installed in compliance with the requirements of the end-
use safety standard, i.e. IEC/EN/UL60950.
Input Reverse-Polarity Protection
The UHP Series does not have reverse polarity protection. If the input
voltage polarity is accidentally reversed, an internal diode will become for-
ward biased. The current howerver is limited to 1.6A. If this current is
exceeded, it could cause permanent damage to the converter.
Input Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate properly
until the ramping-up input voltage exceeds the Start-Up Threshold Voltage
(33V typ.). Once operating, devices will not turn off until the input voltage
drops below the Undervoltage Shutdown limit (31.5V typ.). Subsequent re-
start will not occur until the input is brought back up to the Start-Up Thresh-
old. This built in hysteresis prevents any unstable on/off situations from
occurring at a single input voltage.
Start-Up Time
The V
IN
to V
OUT
Start-Up Time is the interval of time between the point
at which the ramping input voltage crosses the Start-Up Threshold and
the fully loaded output voltage enters and remains within 90% of V
OUT
.
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 at the converter. The UHP Series implements a soft start circuit that
limits the duty cycle of its PWM controller at power up, thereby limiting the
input inrush current.
The On/Off Control to V
OUT
start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin. The
specification defines the interval between the point at which the converter is
turned on (released) and the fully loaded output voltage enters and remains
within its specified accuracy band.
Similar to the V
IN
to V
OUT
start-up, the On/Off Control to V
OUT
start-up
time is also governed by the internal soft start circuitry and external load
capacitance. The difference in start up time from V
IN
to V
OUT
and from On/Off
Control to V
OUT
is therefore insignificant.
TO
OSCILLOSCOPE
L
BUS
C
BUS
–
CURRENT
PROBE
4
+INPUT
+
V
IN
C
IN
1
–INPUT
C
IN
= 33µF, ESR < 700mΩ @ 100kHz
C
BUS
= 220µF, ESR < 100mΩ @ 100kHz
L
BUS
= 12µH
Figure 2. Measuring Input Ripple Current
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) may be reduced below specified limits using
filtering techniques, the simplest of which is the installation of additional
external output capacitors. They function as true filter elements and should be
selected for bulk capacitance, low ESR and appropriate frequency response.
All external capacitors should have appropriate voltage ratings and be
located as close to the converter as possible. Temperature variations for all
relevant parameters should also be taken carefully into consideration.
4
4 0 - 6 0 A M P, S I N G L E O U T P U T C O N V E R T E R S
UHP Models
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.
In Figure 3, the two copper strips simulate real-world PCB impedances
between the power supply and its load. In order to minimize measurement
errors, scope measurements should be made using BNC connectors, or the
probe ground should be as short as possible (i.e. less than ½ inch) and
soldered directly to the fixture.
output voltage to ramp to its appropriate value. If the fault condition persists,
and the output voltage again climbs to excessive levels, the overvoltage
circuitry will initiate another shutdown cycle. This on/off cycling is referred to
as "hiccup" mode.
Current Limiting
As soon as the output current increases to approximately 110% of its rated
value, the DC/DC converter will go into a current-limiting mode. In this condi-
tion, the output voltage will decrease proportionately with increases in output
current, thereby maintaining somewhat constant power dissipation. This is
commonly referred to as power limiting. Current limit inception is defined
as the point at which the full-power output voltage falls below the specified
tolerance. See Performance/Functional Specifications. If the load current,
being drawn from the converter, is significant enough, the unit will go into a
short circuit condition as described below.
Short Circuit Condition
+SENSE
+OUTPUT
6
5
COPPER STRIP
C1
9
8
C2
SCOPE
R
LOAD
–OUTPUT
–SENSE
COPPER STRIP
C1 = 0.1µF CERAMIC
C2 = 10µF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
When a converter is in current-limit mode, the output voltage 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,
the PWM will restart causing the output voltage to begin ramping to their
appropriate value. 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 UHP Series is
capable of enduring an indefinite short circuit output condition.
Figure 3. Measuring Output Ripple/Noise (PARD)
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating" with
respect to their input. Designers will normally use the –Output (pin 9) as the
ground/return of the load circuit. You can however, use the +Output (pin 5) as
ground/return to effectively reverse the output polarity.
Minimum Output Loading Requirements
UHP converters employ a synchronous-rectifier design topology and all
models regulate within spec and are stable under no-load to full load condi-
tions. Operation under no-load conditions however might slightly increase the
output ripple and noise.
Thermal Shutdown
The UHP converters are equipped with thermal-shutdown circuitry. If envi-
ronmental conditions cause the temperature of the DC/DC converter to
rise above the designed operating temperature, 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. See
Performance/Functional Specifications.
Output Overvoltage Protection
The UHP output voltage is monitored for an overvoltage condition using a
comparator. The signal is optically coupled to the primary side and if the
output voltage rises to a level which could be damaging to the load, the sens-
ing circuitry will power down the PWM controller causing the output voltage
to decrease. Following a time-out period the PWM will restart, causing the
5
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