Delta-electronics DNM User Manual download pdf (Page 8)

8.2.4 Output Voltage Set-point Programming

(1) Output Voltage Set-Point Adjustment by external resistor

Output Voltage Set-point Programming can be carried out by using the external program

resistor connect between TRIM pin to ground to set output voltage set-point from 0.75Vdc to

5Vdc, the location can refer to the Evaluation Board Schematic (please refer to the data sheet

for more the detailed specification). These test functions are divided into two types,

Rset of DNM04S and DNL04S series can be calculated by using the following equation:













−

= 5110

7525.0

21070

set

Ω

For example, to program the output voltage of the DNL04S module to 1.8Vdc, below is the

calculation of Rtrim:

150045110

7525.08.1

21070













−

set

Ω

The table 1 provides the Rset value required for some standard output and the location on the

Evaluation board is R33.

Table 1.

Vo,set

Rset (k

Ω

) R33

Recommend Value, R//R

0.7525 Open Open

1.2 41.973 44.2k//825k

1.5 23.077 23.7k//825k

1.8 15.004 15.4k//590k

2.5 6.947 7.15k//243k

3.3 3.160 3.16k//Open

Rset of the DNM12S and DNL12S series can be calculated by using the following equation:













−

= 1000

7525.0

10500

set

Ω

For example, to program the output voltage of the DNL12S module to 3.3Vdc, below is the

calculation of Rset:

31221000

7525.03.3

10500













−

set

Ω

The table 2 provides the Rset value required for some standard output. The location on the

Evaluation board is R33.

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