Delta Electronics DNL Series manual 10500

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:

Rset		21070	
	= 		− 5110	Ω
	Vo − 0.7525		

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

	21070	
Rset = 		− 5110	= 15004	Ω
1.8 − 0.7525		

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:

Rset		10500	
	= 		−1000	Ω
	Vo − 0.7525		

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

Rset		10500	
	= 		−1000	= 3122 Ω
		3.3 − 0.7525
			

The table 2 provides the Rset value required for some standard output. The location on the Evaluation board is R33.

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