Datasheet

20050 SW 112
th
Ave. Tualatin, Oregon 97062 phone [phone] fax [phone]
rev.
page
date
rev.
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DESCRIPTION: point of load converter
6 of 12
08/2007
PART NUMBER: VPOL5A-12-SIP
Q1
VPOL5A-12-SIP
ON/OFF
Control
+Vin +Vo
Remote ON/OFF
CommonCommon
Figure 3. Positive Remote ON/OFF Input Drive Circuit
Q1
ON/OFF
Control
+Vin
Remote ON/OFF
Common Common
+Vo
VPOL5A-12-SIP
Figure 4. Negative Remote ON/OFF Input Drive Circuit
5.7 UVLO (Under-Voltage Lockout)
The voltage on the Vcc pin determines the start of the operation of the
Converter. When the input Vcc rises and exceeds about 8.0V the
converter initiates a soft start. The UVLO function in the converter has a
hysteresis (about 100mV) built in to provide noise immunity at start-up.
6. Safety
6.1 Input Fusing and Safety Considerations.
Agency Approvals: The power Supply shall be submitted to and
receive formal approval from the following test agencies.
1.The power supply shall be approved by a nationally recognized
testing laboratory to UL/CSA 60950 3
rd
Edition (North America) and
EN60950 (International)
2. CB Certificate from an internationally recognized test house in
accordance with EN 60950.
The VPOL5A-12-SIP series converters do not have an internal fuse.
However, to achieve maximum safety and system protection, always
use an input line fuse. The safety agencies require a time-delay fuse
with a maximum rating of 7A.
7. Applications
7.1 Layout Design Challenges.
In optimizing thermal design the PCB is utilized as a heat sink. Also
some heat is transferred from the VPOL5A-12-SIP module to the main
board through connecting pins. The system designer or the end user
must ensure that other components and metal in the vicinity of the
VPOL5A-12-SIP series meet the spacing requirements to which the
system is approved.
Low resistance and low inductance PCB layout traces are the norm and
should be used where possible. Due consideration must also be given
to proper low impedance tracks between power module, input and
output grounds. The recommended VPOL5A-12-SIP footprint as shown
as figure 5.
All Dimmension In Inches(mm)
Tolerance :
.XX= ±0.02 ( ±0. 5 )
.XXX=±0. 010 ( ±0.25 )
LAYOUT PA TTERN
TOP VIEW
0.24(6.1)
0.20(5.1)
1.1mm PLATED THROUGH HOLE
1.6mm PAD SIZE
Figure 5. Recommended VPOL5A-12-SIP Footprint
For more information, please visit the product page.