FEATURES DESCRIPTIONS (CON.)
Output Voltage Programming
The output voltage of IPM can be programmed to any
voltage between 0.8Vdc and 5Vdc by connecting one
resistor (shown as Rtrim in Figure 28, 29) between the
TRIM and GND pins of the module to trim up (0.9V ~ 5V)
and between the Trim and +Output to trim down (0.8V ~
0.9V). Without this external resistor, the output voltage of
the module is 0.9 Vdc. To calculate the value of the
resistor Rtrim for a particular output voltage Vo, please
use the following equation:
Trim up
Rtrim =
Trim Down
Rtrim =
1.070
0.9 - Vout
- 5.612 (KΩ)
Figure 28:
Trim up Circuit
configuration for programming
output voltage using an external resistor
For example, to program the output voltage of a IPM
module to 3.3 Vdc, Vtrim is calculated as follows
Vtrim = 0.7439 – 0.0488 x 3.3
Vtrim = 0.5829V
3.746
Vout –0.9
- 0.261 (KΩ)
Rtrim is the external resistor in KΩ
Vout is the desired output voltage
For example: to program the output voltage of the IPM
module to 3.3Vdc, Rtrim is calculated as follows:
3.746
3.3 –0.9
Vout
Rtrim
Load
Rtrim =
- 0.261 (KΩ)
Trim
GND
Rtrim = 1.300 KΩ
IPM can also be programmed by applying a voltage
between the TRIM and GND pins (Figure 30). The
following equation can be used to determine the value of
Vtrim needed for a desired output voltage Vo:
Vtrim = 0.7439 – 0.0488Vo
Vtrim is the external voltage in V
Vo is the desired output voltage
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
DS_IPM12S0A008_12182006
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DELTA [ DELTA ELECTRONICS, INC. ]
