UHP-3-3-30-D48 Datasheet, PDF (4/4 Pages) List of Unclassifed Manufacturers – Single Output UHP Models

XHP Series
3.3V @ 30A, SINGLE OUTPUT DC/DC CONVERTERS
TECHNICAL NOTES
Trimming Output Voltages
UHP converters have a trim capability (pin 7) that allows users to adjust the
output voltage 5%. Adjustments can be accomplished via a trim pot, Figure 2,
or a single fixed resistor as shown in Figures 3 and 4. A single fixed resistor
can increase or decrease the output voltage depending on its connection.
Fixed resistors should have absolute TCR's less than 100ppm/°C to minimize
sensitivity to changes in temperature.
A single resistor connected from the Trim (pin 7) to the +Sense (pin 6), see
Figure 3, will increase the output voltage. A resistor connected from the Trim
(pin 7) to the –Sense (pin 8) will decrease the output voltage. See Figure 4.
Trim adjustments greater than +10%/–20% can have an adverse effect on the
converter's performance and are not recommended.
1 _–INPUT
2
CASE
3 _ON/OFF
CONTROL
4
+INPUT
5
+OUTPUT
6
+SENSE
7
TRIM
8
–SENSE
9
–OUTPUT
20kΩ
5-22
TURNS
LOAD
1 _–INPUT
2
CASE
3 _ON/OFF
CONTROL
4
+INPUT
5
+OUTPUT
6
+SENSE
7
TRIM
RTRIM DOWN
8
–SENSE
9
–OUTPUT
LOAD
Figure 4. Trim Connections To Decrease Output Voltages Using Fixed Resistors
Trim Up Equation
13.3(VO – 1.226)
RT _UP (kΩ) =
VO – 3.3
–10.2
Trim Down Equation
16.31
RT_DOWN (kΩ) = _{3.3 – VO} –10.2
Accuracy of adjustment is subject to tolerances or resistor values
and factory-adjusted output accuracy. VO = desired output voltage.
Figure 2. Trim Connections Using A Trim Pot
1 _–INPUT
2
CASE
3 _ON/OFF
CONTROL
4
+INPUT
5
+OUTPUT
6
+SENSE
7
TRIM
8
–SENSE
RTRIM UP
9
–OUTPUT
LOAD
Figure 3. Trim Connections To Increase Output Voltages Using Fixed Resistors
Output Current vs. Ambient Temperature
VIN = 48V, Air flow from output pins to input pins
30
25
150lfm
200lfm
20
400lfm
300lfm
15
10
NATURAL CONVECTION
5
0
28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 94 96 100
Ambient Temperature (_˚C)
®
®
INNOVATION and EXCELLENCE
ISO 9001 REGISTERED
DS0492
2/01
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