N O N - I S O L AT E D , 3 . 3 V, 8 - 4 0 W D C / D C C O N V E R T E R S
Performance Specifications and Ordering Guide
Output
Model
UNR-3.3/3000-D5
UNR-3.3/2500-D12
UNR-3.3/8000-D5
UNR-3.3/12000-D5
➄
➀
➁
➂
➃
➀
Input
Regulation (Max.)
Load
➂
Line
±0.25%
±0.2%
±0.25%
±0.25%
±0.5%
±0.5%
±0.5%
±0.75%
V
OUT
(Volts)
3.3
3.3
3.3
3.3
I
OUT
(mA, Max.)
3000
2500
8000
12000
Ripple/Noise
➁
(mVp-p, Max.)
140
100
75
125
V
IN
Nom.
(Volts)
5
12
5
5
Range
(Volts)
4.75-5.5
10.8-13.2
4.75-5.5
4.75-5.5
I
IN
➃
(mA, Max.)
25/2390
35/856
25/6330
50/9700
Efficiency
(Min.)
85%
82%
86%
84%
Package
(Case,
Pinout)
C7, P9
C7, P10
C5, P9
C6, P9
Typical at T
A
= +25°C under nominal line voltage and full load conditions unless otherwise noted. These devices require external input and output capacitors for normal operation.
20MHz bandwidth. Specified with external I/O capacitors. See Technical Notes.
10% to 100% load.
Nominal line voltage, no load/full load conditions.
➄
Model UNR-3.3/12000-D5 is no longer available. Use DATEL model UNR-3.3/12-D5 for replacement.
Part Number Structure
Case C5
U NR
-
3.3
/
8000
-
D5
Output Configuration:
U
= Unipolar
Non-Isolated
Nominal Output Voltage:
3.3 Volts
Maximum Output Current
in mA
Input Voltage Range:
D5
= 4.75-5.5 Volts (5V nominal)
D12
= 10.8-13.2 Volts (12V nominal)
0.45
(11.43)
2.00
(50.80)
METAL CASE
INSULATED BASE
0.20 MIN
(5.08)
0.040 ±0.002 DIA
(1.016 ±0.051)
1.800
(45.720)
0.10
(2.54)
3
Mechanical Specifications
0.300
(7.620)
1
0.800
(20.320)
2
Case C7
1.00
(25.40)
4
5
6
BOTTOM VIEW
0.400
(10.160)
1.00
(25.40)
METAL CASE
0.45
(11.43)
0.200
(5.080)
0.10
(2.54)
Case C6
INSULATED BASE
0.040 ±0.002 DIA
(1.016 ±0.051)
0.800
(20.320)
0.10
(2.54)
0.45
(11.43)
2.00
(50.80)
METAL CASE
0.20 MIN.
(5.08)
0.100
(2.540)
1
2
0.200
(5.080)
3
0.400
(10.160)
4
5
6
BOTTOM VIEW
0.10
(2.54)
0.200
(5.080)
1
2
0.300
(7.620)
3
INSULATED BASE
0.20 MIN
(5.08)
1.800
(45.720)
0.10
(2.54)
0.800
1.00
(20.320) (25.40)
0.60
(15.24)
Pin
1
2
3
4
5
6
I/O Connections
Function P9
Function P10
Logic Gnd.
Do Not Connect
On/Off Control
No Connect
+Output
+Output
Output Rtn.
Output Rtn.
Input Rtn.
Input Rtn.
+Input
+Input
4
5
6
0.200
(5.080)
0.800
(20.320)
0.400
(10.160)
2.00
(50.80)
BOTTOM VIEW
PIN DIAMETER:
PINS 1-2
0.040 ±0.002 (1.016 ±0.051)
PINS 3-6
0.060 ±0.002 (1.524 ±0.051)
2
N O N - I S O L AT E D , 3 . 3 V, 8 - 4 0 W D C / D C C O N V E R T E R S
UNR Series
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full load conditions unless noted.
➀ ➁
Input
Input Voltage Range:
"D5" Models
"D12" Models
Input Current
Input Filter Type
➁
Overvoltage Shutdown
Reverse-Polarity Protection
On/Off (Sync.) Control
(Pin 2)
➂
4.75-5.5 Volts (5V nominal)
10.8-13.2 Volts (12V nominal)
See Ordering Guide
None
None
Yes (Instantaneous, 10A maximum)
TTL high = off, low (or open) = on
Output
V
OUT
Accuracy
(50% load)
Temperature Coefficient
Ripple/Noise
(20MHz BW)
➁
Line/Load Regulation
Efficiency
Current Limiting
±1%
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
Auto-recovery
Dynamic Characteristics
Transient Response
(25% load step)
Switching Frequency:
"D5"
Models
"D12" Models
100µsec to ±1.5% of final value
Absolute Maximum Ratings
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. Storage temperatures have been verified for 168 hours.
Input Voltage:
"D5" Models
"D12" Models
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
7 Volts
15 Volts
Current must be <10A. Brief
duration. Fusing recommended.
None
Current limited. Max. current and
short-circuit duration model
dependent.
–55 to +105°C
+300°C
Storage Temperature
Lead Temperature
(soldering, 10sec.)
Temperature Derating
75kHz (±5kHz)
90kHz (±5kHz)
Environmental
20
19
18
17
16
15
UNR-3.3/12000-D5
UNR-3.3/8000-D5
UNR-3.3/3000-D5
UNR-3.3/2500-D12
A
B
C
D
Output Current (Amps)
Operating Temperature
(ambient):
Without Derating:
3A an 8A "D5" Models
12A "D5" and 2.5A "D12" Models
With Derating
Storage Temperature
–40 to +50°C
–40 to +45°C
to +100°C (See Derating Curves)
–55 to +105°C
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
40
0
40
45
50
55
60
65
70
D
C
B
A
Physical
Dimensions:
3A "D5" and 2.5A "D12" Models
8A "D5" Model
Shielding
Case Connection
Case Material
Pin Material
Weight:
3A "D5" and 2.5A "D12" Models
8A "D5" Model
1" x 1" x 0.45" (25 x 25 x 11.4mm)
2" x 1" x 0.45" (51 x 25 x 11.4mm)
5-sided
➃
Pin 4 (Output Return)
Corrosion resistant steel with
epoxy-based enamel finish
Brass, solder coated
1 ounce (28.4 grams)
1.5 ounces (42.5 grams)
75
80
85
90
95
100
Ambient Temperature (°C)
➀
These power converters require a minimum 10% loading to maintain specified regulation.
Operation under no-load conditions will not damage these devices, however, they may
not meet all listed specifications.
➁
These power converters do not have internal input filters and do require external input
and output capacitors to achieve rated specifications. Application-specific internal input/
output filtering can be added upon request. Contact DATEL for details.
➂
On/Off Control pins are included on "D5" models only. See Technical Notes for details.
Applying a voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter.
➃
Cases can be provided with 6-sided shielding. Contact DATEL for details.
3
UNR Series
N O N - I S O L AT E D , 3 . 3 V, 8 - 4 0 W D C / D C C O N V E R T E R S
Technical Notes
Input Capacitors
As shown in the simplified schematic, UNR Series power converters do not
have internal input capacitors. Users must install external input capacitors
for the devices to achieve specified operation. The input capacitor functions
as a true energy-storage element. Its required capacitance varies as a
function of applied line voltage. Additionally, as the power converter’s input
FET switch cycles on and off, the input capacitor must have the ability to
rapidly supply pulses of relatively high current. Therefore, required rms-
ripple-current capabilities of the input capacitor will vary as a function of the
power converter’s load current. Rather than install a large, expensive,
UNR-3.3/8000-D5
Minimum Input Capacitor Value vs. V
IN
@ Full Load
10000
4
internal capacitor that addresses all possible load conditions, we have
chosen to leave the capacitor out so that you may select a cost-effective
component appropriate to your particular application.
Use the charts below to determine how much input capacitance is required
as a function of input voltage and also to determine the required rms-ripple-
current capabilities of the needed capacitor as a function of output load
current. Note that "low-line" conditions will require proportionally more input
capacitance in order to maintain the required energy levels and that higher
output currents will obviously require higher input currents. Contact DATEL’s
Applications Engineering Group if you have any questions.
C
IN
RMS Ripple Current vs. I
LOAD
C
IN
RMS Ripple Current (Amps)
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
5.25
5.30
5.35
5.40
5.45
5.50
3.5
3
2.5
2
1.5
1
0.5
0
1
2
3
4
5
6
7
8
Input Capacitance (µF)
1000
100
4.75
Input Voltage (Volts)
Output Load Current (Amps)
UNR-3.3/3000-D5
Minimum Input Capacitor Value vs. V
IN
@ Full Load
1000
2
C
IN
RMS Ripple Current vs. I
LOAD
C
IN
RMS Ripple Current (Amps)
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
5.25
5.30
5.35
5.40
5.45
5.50
1.75
1.50
1.25
1
0.75
0.50
0.25
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3.0
Input Capacitance (µF)
100
10
4.75
Input Voltage (Volts)
Output Load Current (Amps)
4
N O N - I S O L AT E D , 3 . 3 V, 8 - 4 0 W D C / D C C O N V E R T E R S
UNR Series
Reducing Output Ripple/Noise
In addition to their internal output capacitors, UNR Series DC/DC converters
require the installation of external output capacitors to achieve their
published ripple/noise specifications. The selected caps should be low-ESR,
tantalum or electrolytic types, and they should be located as close to the
converters as possible. Recommended values are listed in the table below.
Part Number
UNR-3.3/3000-D5
UNR-3.3/2500-D12
UNR-3.3/8000-D5
Output Capacitor
470µF, 6V, Low ESR
100µF, 6V, Low ESR
1000µF, 6V, Low ESR
Synchronization
If desired, a synchronizing clock can be applied to pin 2 on "D5" models to
control the converter’s internal clock oscillator. The applied clock should be a
square wave with a maximum 1µsec "high" duration and an amplitude between
+2V and +5V (see On/Off Control) referenced to pin 1 (Logic Ground). The
frequency of the synchronizing clock must be higher than that of the standalone
converter. Therefore, it should be 85kHz ±5kHz.
Synchronization Issues
Because of the comparatively small differential between their input and output
voltages, 5V-to-3.3V DC/DC converters capable of sourcing high output current
also demand high input current. Most of these high-current DC/DC’s use
switching architectures employing fixed-frequency clock oscillators, and their
input currents include both dc (average) and ac (ripple) components.
If you have multiple DC/DC’s connected to a single main power bus, you may
need to consider that all the converters will not be switching at exactly the
same frequency (due to normal component and manufacturing tolerances).
Consequently, the converters may randomly "self-synchronize" in their
demanding of peak current from the main power bus. Peak currents all
drawn simultaneously can be significantly greater than the sum of average
input currents. This phenomenon can result in unwanted harmonic
interactions from converter to converter along the power bus.
One solution to this potential problem is to use the converters' On/Off Control
function to effectively "de-synchronize" their clocks. Forcing the multiple
clocks to be out of phase with each other relaxes the required performance
characteristics of the main power bus so the bus now has to carry the sum of
the average currents of all the converters plus only one peak current.
Remote On/Off Control and the Logic Ground Pin
The On/Off Control pin (pin 2 on "D5" units) may be used for digitally controlled
on/off operation. A TTL logic high (+2 to +5 Volts, 250µA max.) applied to pin 2
disables the converter. A TTL logic low (0 to +0.8 Volts, 70µA max.), or no
connection, enables the converter. Control voltages should be referenced to pin
1 (Logic Ground). Applying a voltage to the Control pin when no input power is
applied to the converter can cause permanent damage to the converter.
The Input Return (pin 5), Output Return (pin 4) and Logic Ground (pin 1 on "D5"
models) are all tied together internal to the device. To the extent possible, load
current should be returned to pin 4. Pin 5 should be connected back to the
input supply with as low an impedance as possible so that input return current
flows through pin 5. The internal trace leading to the Logic Ground pin is not
designed to carry high currents. Devices should not be installed in a manner
that results in high current flow through pin 2 (i.e., pins 4 and 5 should never be
left open or attached via high-impedance connections).
"D12" models do not have On/Off Control functions. Their pin 2 (No Connect)
is not electrically connected to any internal circuiitry and may be tied to any
convenient external run. Their pin 1 (Do Not Connect) is a test point. Pin 1 may
be soldered to an island for mechanical mounting purposes, but it should not
have an electrical connection to external circuitry.
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