Delta Electronics DNT04 manual Feature Descriptions CON, Voltage Margining

FEATURE DESCRIPTIONS (CON.)

Vo

TRIM

GND

Vtrim RLoad

+

_

Figure 29: Circuit Configuration for programming output voltage using external voltage source

The amount of power delivered by the module is the voltage at the output terminals multiplied by the output current. When using the trim feature, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. Care should be taken to ensure that the maximum output power of the module must not exceed the maximum rated power (Vo.set x Io.max ≤ P max).

Voltage Margining

Output voltage margining can be implemented in the DNT modules by connecting a resistor, R margin-up, from the Trim pin to the ground pin for margining-up the output voltage and by connecting a resistor, Rmargin-down, from the Trim pin to the output pin for margining-down. Figure 30 shows the circuit configuration for output voltage margining. If unused, leave the trim pin unconnected. A calculation tool is available from the evaluation procedure which computes the values of R margin-upand Rmargin-downfor a specific output voltage and margin percentage.

Vin Vo

On/Off Trim

Rmargin-down Q1

Rmargin-up

Rtrim Q2

GND

Figure 30: Circuit configuration for output voltage margining

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