Delta Electronics S48SA - Manual (Page 8)

DS_S48SA05006_06022006
[ ]
ΚΩ −
∆
− ∆ +
= −
1 . 73
% Vo
up
1690 %) 100 ( 69 Vo
x. When trim-up +10% (5V X 1.1 = 5.5V)
Rtrim
E
[ ]
ΚΩ = −
− +
= −
9 . 516 1 . 73
10
up
1690 ) 10 100 ( 69
Care should be taken to ensure that the maximum
utput Voltage Adjustment (TRIM)
o increase or decrease the output voltage set point, the
Rtrim
output power of the module remains at or below the
maximum rated power.
O
T
modules may be connected with an external resistor
between the TRIM pin and either the Vo+ or Vo -. The
TRIM pin should be left open if this feature is not used.
Figure 15: Circuit configuration for trim-down (decrease output
the external resistor is connected between the TRIM
voltage)
If
and Vo- pins, the output voltage set point decreases.
The external resistor value required to obtain a
percentage of output voltage change △Vo% is defined
as:
[ ]
ΚΩ
∆
1 . 73
% Vo
down
1690 −
= −
x. When trim-down –10% (5V X 0.9 = 4.5V)
Rtrim
E
[ ]
ΚΩ
9 . 95 1 . 73
10
down
1690
= − = −
Rtrim
Figure 16: Circuit configuration for trim-up (increase output
the external resistor is connected between the TRIM
voltage)
If
and Vo+the output voltage set point increases. The
external resistor value required to obtain a percentage
output voltage change △Vo% is defined as:
8