Delta Electronics IPM24S0B0 - Manual (Page 9)

DS_IPM24S0B0_03202007
9
FEATURES DESCRIPTIONS (CON.)
Figure 28: Trim up Circuit configuration for programming
output voltage using an external resistor
Rtrim
Load
Vout
Trim
GND
Figure 29: Trim down Circuit configuration for programming
output voltage using an external resistor
Figure 30: Circuit configuration for programming output voltage
using external voltage source
Table 1 provides Rtrim values required for some common
output voltages. By using a 0.5% tolerance resistor, set
point tolerance of ±2% can be achieved as specified in the
electrical specification.
Table 1 Rtrim is the external resistor in KΩ;
Vout is the desired output voltage
Rtrim setting (Ω)
Output
Measurement
R.trim_Up R.trim_Down 0A
Vo 3.3 NC NC 3.323V
Vadj 4.0 5.36K NC 4.023V
Vadj 5.0 2.21K NC 5.019V
Vadj 6.5 1.18K NC 6.493V
Vadj 3.3*(1-10%) NC 36.5K 2.984V
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 IPM
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, R
margin-down
, from the Trim pin
to the output pin for margining-down. Figure 32 shows
the circuit configuration for output voltage margining.
If
unused, leave the trim pin unconnected.
Vo
On/Off
Vin
GND
Trim
IPM
Q2
Q1
Rmargin-up
Rmargin-down
Rtrim
Figure 32: Circuit configuration for output voltage margining