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UHR-12/1650-D12 View Datasheet(PDF) - DATEL Data Acquisition products

Part Name
Description
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UHR-12/1650-D12
Datel
DATEL Data Acquisition products  Datel
UHR-12/1650-D12 Datasheet PDF : 4 Pages
1 2 3 4
XHR Series
16-20W, SINGLE OUTPUT DC/DC CONVERTERS
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For DATEL UHR
16-20 Watt DC/DC Converters, you should use slow-blow type fuses with
values no greater than the following:
VIN Range
Fuse Value
"D12"
4A
"D48"
2A
On/Off Control
The On/Off Control pin (pin 4) may be used for remote on/off operation. A
TTL logic high (+2 to +5 Volts, 250µA max.) applied to pin 4 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 2
(–Input). Applying a voltage to the Control pin when no input power is
applied to the converter can cause permanent damage to the converter.
Synchronization
In certain applications employing multiple UHR converters and also
demanding minimal noise levels, some improvements may be had by
synchronizing the switching of the various converters. The synchronizing
clock should be applied to pin 4 (Control) of each device. It 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 2 (–Input).
The frequency of the synchronizing clock should be higher than that of any
individual converter. Therefore, it should be 180kHz ±5kHz.
Output Trimming
VOUT may be trimmed ±5% via a single external trimpot or fixed resistor. The
trimpot should be connected as shown in Figure 2a with its wiper connected
to pin 8 (Trim). A trimpot can be used to determine the value of a single fixed
resistor which should be connected as shown in Figure 2b. Connect the
resistor between pin 8 (Trim) and pin 6 (+Output) to trim "down" the output
voltage. Connect the resistor between pins 8 and 7 (Common) to trim "up"
the output voltage. Fixed resistors should be metal-film types with absolute
TCR’s less than 100ppm/°C to ensure stability.
1
+INPUT
2
–INPUT
6
OUTPUT
8
TRIM
7
COMMON
Trim Down
20k
5-10
Turns
LOAD
Trim Up
Figure 2a. Trim Connections Using a Trimpot
1
+INPUT
2
–INPUT
6
OUTPUT
8
TRIM
7
COMMON
Trim
Down
LOAD
Trim Up
Figure 2b. Trim Connections Using Fixed Resistors
®
®
INNOVATION and EXCELLENCE
ISO 9001
REGISTERED
DS-0355
10/98
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com Email: sales@datel.com
Data Sheet Fax Back: (508) 261-2857
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
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.
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