cui.com

date 07/12/2016

│ page 8 of 9

CUI Inc

│ SERIES: PDQ15-D │ DESCRIPTION: DC-DC CONVERTER

Note: R

R

V

V

R1, R2, R3, Rt, and Vr are internal (see Table 4)

Table 4

Output Voltage Trimming

The output voltage can be adjusted (single outputs only) by using the trim pin and the use of either an external trim pot or

the use of a single fixed resistor (see Figures below). If the trim function is not needed, leave the trim pin open.

APPLICATION NOTES

)

(k

)

1

2

)

(

1

(

1

,

Rt

R

Vo

V

R

Vr

R

R

nom

o

down

trim

)

(k

)

2

)

(

)

3

2

(

1

(

,

Rt

R

V

Vo

R

R

R

Vr

R

nom

o

up

trim

Output

Voltage

(Vdc)

R1

(kΩ)

R2

(kΩ)

R3

(kΩ)

Rt

(kΩ)

Vr

(V)

3.3

2.74

1.8

0.27

9.1

1.24

5

2.32

2.32

0

8.2

2.5

12

6.8

2.4

2.32

22

2.5

15

8.06

2.4

3.9

27

2.5

Formula for Trim Resistor

+Vin

-Vin

-Vo

+Vo

R-Load

Trim

10 k

Trimpot

+Vin

-Vin

-Vo

+Vo

R trim-down

R-Load

Trim

Figure 5 Trim Adjustments To Increase

Output Voltage Using A Fixed Resistor

+Vin

R trim-up

R-Load

Trim

+Vo

-Vin

-Vo

Figure 4 Trim Adjustments Using

A Trimpot

Figure 6 Trim Adjustments To Decrease

Output Voltage Using A Fixed Resistor

For more information, please visit the product page.