VPOL5A-12-SMT CUI Inc, VPOL5A-12-SMT Datasheet - Page 11

• Manufacturer Part Number: VPOL5A-12-SMT
• Description: CONVERTER DC/DC 5.0V OUT 5A SMD
• Manufacturer: CUI Inc
• Series: V-Infinity VPOL5Ar
• Type: Point of Load (POL) Non-Isolatedr

Specifications of VPOL5A-12-SMT

• Output: 0.75 ~ 5V
• Number Of Outputs: 1
• Power (watts): 25W
• Mounting Type: Surface Mount
• Voltage - Input: 8.3 ~ 14V
• Package / Case: 5-DIP SMD Module
• 1st Output: 5 VDC @ 5A
• Size / Dimension: 0.80" L x 0.45" W x 0.24" H (20.3mm x 11.4mm x 6.1mm)
• Power (watts) - Rated: 25W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 92%
• Approvals: cUL, UL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -
• 2nd Output: -
• Other names: 102-1290-2

PART NUMBER: VPOL5A-12-SMT
7.8 VPOL5A-12-SMT Output Voltage Adustment.
The output Voltage of the VPOL5A-12-SMT can be adjusted in the
range 0.75V to 5.0V by connecting a single resistor on the motherboard
(shown as R trim) in Figure 12. When Trim resistor is not connected the
output voltage defaults to 0.75V
The value of Rtrim-up defined as:
Where: Rtrim-up is the external resistor in ohm,
To give an exa mple of the above calculation, to set a voltage of 3.3Vdc,
Rtrim is given by:
Rtrim = 3118 ohm
For various output values various resistors are calculated and provided
in Table 3 for co nvenience.
20050 SW 112
Vo is the desired output voltage
+Vin
Common
VPOL5A-12-SMT
Rtrim =
Figure 12. Trim-up Voltage Setup
Rtrim =
Table 3 – Trim Resistor Values
Vo,set (V)
0.75
1.2
1.5
1.8
2.0
2.5
3.3
5.0
th
(
Ave. Tualatin, Oregon 97062
(
Common
3
Vo
3 .
10500
10500
_
_
+Vo
Trim
. 0
. 0
75
75
Rtrim (Kohm)
Open
22.33
13.00
9.00
7.40
5.00
3.12
1.47
_
_
1000
1000
R trim-up
)
)
R-Load
phone [phone] fax [phone]
DESCRIPTION: point of load converter
7.9 Output Ripple and Noise Measurement
The test set-up for noise and ripple measurements is shown in Figure
13. a coaxial cable with a 50ohm termination was used to prevent
impedance mismatch reflections disturbing the noise readings at higher
frequencies.
7.10 Output Capacitance
V-Infinity’s VPOL5A-12-SMT converters provide unconditional stability
with or without external capacitors. For good transient response low
ESR output capacitors should be located close to the point of load.
For high current applications point has already been made in layout
considerations for low resistance and low inductance tracks.
Output capacitors with its associated ESR values have an impact on
loop stability and bandwidth. V-Infinity’s converters are designed to
work with load capacitance up-to 3,000uF. It is reco mmended that any
additional capacitance, Maximum 3,000uF and low ESR, be connected
close to the point of load and outside the remote compensation point.
7.11 VPOL5A-12-SMT Reflow Profile
An example of the reflo w profile is given in Figure 14.
Equipment used: SMD HOT AIR REFLOW HD-350SAR
Alloy : AMQ-M293TA or N C-SMQ92 IND-82088 SN63
Figure 13. Output Voltage Ripple and Noise Measurement Set-Up
240
200
160
120
80
40
+Vin
Common
0
VPOL5A-12-SMT
0
30
Figure 14
Common
+Vo
60
REFLOW PROFILE
TIME (SECONDS)
90
VPOL5A-12-SMT Reflow Profile
120 150 180 210 240
10uF
Tant.
Ceramic
1uF
rev.
page
date
Test Jack
R-Load
08/2007
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