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What is USN-xxxx?

This electronic component, produced by the manufacturer "Datel", performs the same function as "Single Output D5 Models".


USN-xxxx Datasheet PDF - Datel

Part Number USN-xxxx
Description Single Output D5 Models
Manufacturers Datel 
Logo Datel Logo 


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®®
INNOVATION and EXCELLENCE
Single Output
USN D5 Models
Non-Isolated, 5VIN, 1.5-3.3VOUT
8/10A DC/DC’s in SIP Packages
Features
Industry-standard SIP pinout
Shorter (2.0" vs. 2.5") package length
4.5-5.5V input range
1.5/1.8/2.5/3.3V outputs @ 8 or 10 Amps
Non-isolated, fully synchronous,
200kHz, buck topology
Superior performance vs. competitors:
8/10 Amps vs. 6 Amps
±1% setpoint accuracy
Efficiencies to 91%
Noise as low as 25mVp-p
Stable no-load operation
Wide-range trimmable output voltage
Remote on/off control; Optional sense pin
Power-good pin and "Lucent-compatible"
on/off control available
EN60950 and UL1950 certified
EMC compliant
DATEL’s new USN D5 Series SIP’s (single-in-line packages) are non-isolated
DC/DC converters that accept a 5V input (4.5V to 5.5V input range) and deliver 1.5V,
1.8V, 2.5V or 3.3V outputs at either 8 or 10 Amps. USN D5 SIP’s are designed to take
on-board 5V power and convert it, with the highest efficiency in the smallest space, to
any lower voltage required by today’s current-hungry DSP’s, ASIC’s and CPLD’s.
USN’s are ideal for true point-of-use power processing. They occupy a mere
0.8 square inches of board space (2" length, 0.4" width, 0.53" height). Their fully
synchronous, fixed-frequency (200kHz), buck topology delivers high efficiency (91%
for 3.3VOUT models), tight regulation (±0.1%/±0.5% line/load), stable no-load opera-
tion, and low output noise (25mVp-p for 1.5/1.8VOUT models).
The fully functional USN’s feature input undervoltage shutdown, output overcur-
rent detection, continuous short-circuit protection, a wide-range output-voltage trim
function, a remote on/off control pin, and an optional sense pin.
USN’s are pin compatible with similar devices from Lucent/Tyco, Artesyn Tech-
nologies DanadtaPSowheere-Ot4nUe..cUoSmN’s, however, deliver more current (10A vs. 6A), from
a smaller package (2.0" vs. 2.5" long), with better accuracy (±1% max.), tighter
regulation, less noise, and superior temperature performance. If a USN SIP is
operated at only 6 Amps, for example, it can reliably operate up to +65°C (with
100lfm air flow).
If your low-voltage, high-current requirements have made the use of inefficient
linear regulators impractical, take a look at one of DATEL’s easy-to-use, low-cost
USN SIP’s. All devices are UL1950/EN60950 certified and EMC compliant. UL, CB
and EMC reports are available upon request.
DataShee
+INPUT
+OUTPUT
+SENSE
(OPTIONAL)
COMMON
ON/OFF
CONTROL
10k
For devices with the sense-pin option ("R" suffix), the
feedback path is through the +Sense pin and not the
DataSheet4U.co+mOutput pin.
CURRENT
SENSE
PWM
CONTROLLER
REFERENCE &
ERROR AMP
Figure 1. Simplified Schematic
COMMON
TRIM
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: [email protected] · Internet: www.datel.com
DataSheet4 U .com

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USN-xxxx equivalent
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NON-ISOLATED, 12-33W SIP DC/DC CONVERTERS
USN Models
Output Overvoltage Protection
USN D5 SIP Series DC/DC converters do not incorporate output overvoltage
protection. In the extremely rare situation in which the device’s feedback loop
is broken, the output voltage may run to excessively high levels (VOUT = VIN).
If it is absolutely imperative that you protect your load against any and all
possible overvoltage situations, voltage limiting circuitry must be provided
external to the power converter.
Output Overcurrent Detection
Overloading the output of a power converter for an extended period of
time will invariably cause internal component temperatures to exceed their
maximum ratings and eventually lead to component failure. High-current-
carrying components such as inductors, FET's and diodes are at the highest
risk. USN D5 SIP Series DC/DC converters incorporate an output overcur-
rent detection and shutdown function that serves to protect both the power
converter and its load.
When the output current exceeds the maximum rating by 20% (typical) to
35% (maximum), the internal overcurrent-detection circuit limits output cur-
rent. If the overload condition forces VOUT to fall below 80% of rated output,
the short-circuit detection circuit will latch the DC/DC into an off state. The
latched condition can be reset by cycling the input voltage to the converter or
by cycling the On/Off Control pin.
+INPUT
COMMON
+OUTPUT
TRIM
COMMON
Trim
Down
LOAD
Trim Up
Note: Install either a fixed trim-up resistor or a fixed trim-down resistor
depending upon desired output voltage.
Figure 5. Trim Connections Using Fixed Resistors
USN-1.8/8-D5, USN-1.8/10-D5 Trim Equations
2.55(VO – 1.23)
RTDOWN (k) = 1.8 – VO
– 2.21
3.14
RTUP (k) = VO – 1.8
– 2.21
USN-2.5/8-D5, USN-2.5/10-D5 Trim Equations
Output Voltage Trimming
et4U.com Allowable trim ranges for each model in the USN D5 SIP Series are listed
in the Performance/Functional Specifications table. Trimming is accomplished
with either a trimpot or a single fixed resistor. The trimpot should be Dcoan-taSheet4U.com
nected between +Output and Common with its wiper connected to the Trim
pin as shown in Figure 4 below.
5.677(VO – 1.23)
RTDOWN (k) =
2.5 – VO
– 4.42
6.983
RTUP (k) = VO – 2.5
– 4.42
USN-3.3/8-D5, USN-3.3/10-D5 Trim Equations
DataShee
+INPUT
COMMON
+OUTPUT
TRIM
COMMON
20k
5-10
Turns
LOAD
Figure 4. Trim Connections Using a Trimpot
A trimpot can be used to determine the value of a single fixed resistor
which should be connected, as shown in Figure 5, between the Trim pin
and +Output to trim down the output voltage, or between the Trim pin and
Common to trim up the output voltage. Fixed resistors should have absolute
TCR’s less than 100ppm/°C to ensure stability.
The equations below can be used as starting points for selecting specific
trim-resistor values. Recall that untrimmed devices are guaranteed to be ±1%
accurate.
4.46(VO – 1.24)
RTDOWN (k) = 3.3 – VO
– 1.74
5.512
RTUP (k) = VO – 3.3
– 1.74
Note: Resistor values are in k. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage.
Functional Options
USN Series SIP’s have been designed so that a “Power-Good” function can
be installed on Pin 9 (Contact DATEL). Standard models do not have a pin
in the Pin 9 position.
Also, the standard polarity of the USN’s On/Off Control function (pin 11 open
or pulled high = on) complies with industry standards. Nevertheless, it is not
compatible with the on/off polarity of the Lucent/Tyco NH020 Series SIP’s
(pin 9 open = off). Please contact DATEL if you would like us to modify
devices to be Lucent compatible.
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On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for USN-xxxx electronic component.


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