Delta Electronics Delphi DNT04 Specification Sheet page 9

FEATURE DESCRIPTIONS (CON.)
TRIM
GND
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
pin to the ground pin for margining-up the output voltage
and by connecting a resistor, R
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
specific output voltage and margin percentage.
Vo
Vin
Trim
On/Off
GND
Figure 30: Circuit configuration for output voltage margining
DS_DNT04SIP3A_09262007
Vo
Vtrim
RLoad
+
_
.
, from the Trim
margin-up
, from the Trim pin
margin-down
and R for a
margin-up margin-down
Rmargin-down
Q1
Rmargin-up
Q2
Rtrim
9