UNR-3.3/3-D5 Murata Power Solutions Inc, UNR-3.3/3-D5 Datasheet - Page 6

• Manufacturer Part Number: UNR-3.3/3-D5
• Description: DC/DC Converter
• Manufacturer: Murata Power Solutions Inc

Specifications of UNR-3.3/3-D5

• Dc / Dc Converter O/p Type: Fixed
• No. Of Outputs: 1
• Input Voltage: 4.75V To 5.5V
• Power Rating: 10W
• Output Voltage: 3.3V
• Output Current: 3A
• Approval Bodies: EN, IEC, UL
• Supply Voltage: 5V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

On/Off Control
3.6-10W Series converters are designed so that they are enabled when the
control pin is pulled high or left open (normal mode) and disabled when the
control pin is pulled low (to less than +0.8V relative to Logic Ground). As
shown in the fi gure and table below, each device has an internal pull-up
resistor on its On/Off Control pin whose value and voltage vary with model.
mechanical relay or an open-collector/open-drain drive circuit (optically
isolated if appropriate). The drive circuit should obviously be able to sink
appropriate current when activated and withstand appropriate voltage when
deactivated.
is applied to the converter can cause permanent damage to the converter.
The on/off control function, however, is designed such that the converter
can be disabled (pin 2/3 pulled low) while input power is ramping up and
then "released" once the input has stabilized. The time duration between the
point at which the converter is released and its fully loaded output voltage
settles to within specifi ed accuracy can be found in the Performance/Func-
tional Specifi cations Table.
The On/Off Control pin may be used for remote on/off operation. UNR
Dynamic control of the on/off function is best accomplished with a
Applying an external voltage to the On/Off Control when no input power
Model
UNR-1.8/2-D5/-D5SM
UNR-2.5/2-D5/-D5SM
UNR-3.3/3-D5/-D5SM
UNR-3.3/3-D12/-D12SM
Figure 2. Driving the On/Off Control Pin
R
EP
Resistor (R
Internal
Pull-Up
10k:
1k:
1k:
1k:
+INPUT
ON/OFF
CONTROL
LOGIC GROUND
IP
)
Resistor (R
V
External
Pull-Up
IP
15k:
N.A.
N.A.
N.A.
R
IP
EP
)
Voltage (V
www.murata-ps.com
Internal
Pull-Up
1.8V
2.5V
3.3V
V
IN
Single Output, Non-Isolated, 1.8/2.5/3.3V
IP
)
SMT Solder Process for SM models
CAUTION — Avoid Refl ow Ovens
gull-wing leads are made of tin-plated (150 microinches) copper. The
gull-wing confi guration, as opposed to “J” leads, was selected to keep the
solder joints out from under the package to minimize both, heat conduc-
tion away from the leads (into the encapsulated package) and shadowing
effects.
cess with its most common temperature profi les. In order to avoid damage
to the converter a selective solder process (i.e. hot air gun or a hand solder-
ing method) with the following parameters must therefore be chosen :
size to be 160 mils by 130 mils (4 x 3.3 mm).
For the surface-mount "SM" models of the UNR Series, the packages’
"SM" modules do not currently withstand the standard solder-refl ow pro-
Pre-heat phase 30-60°C rise/minute to 150°C maximum.
Lead temperature 300°C for 10 seconds maximum.
As shown in Figure 3, our tests have determined the optimal landing-pad
* PAD DIMENSION
** LEAD DIMENSION
0.015
(0.38)
0.130*
(3.30)
0.100**
(2.54)
Figure 3. PC Board Land Pattern
0.160*
(4.06)
04 Nov 2010 MDC_UNR 3.6-10W_B02 Page 6 of 8
OUT
0.110**
(2.79)
3.6-10W DC/DC Converters
email: [e-mail]
UNR Series