Projecta IM2000 Instrucciones de operaciones descargar pdf (Pagina 39)

Setting the Output Current

The IM483 uses an internal 1 milliamp current source to establish the reference

voltage needed to control the output current. This voltage is programmed by

means of an external 1/8 watt or higher, 1 percent resistor connected between

P2:2 (Current Adjust) and P2:3 (Power Ground).

The relationship between the output current and the current adjust resistor

value is expressed as follows:

Output Current = .002 X Resistor Value (Ω)

This resistor MUST be in place for the driver to operate! A fault condition will

occur and may be accompanied by driver damage if the IM483 is powered in an

enabled state without this resistor in place.

Figure 7.2 illustrates the connection of this resistor. Table 7.1 lists the resistor

values for the driver output current in 200 milliamp increments.

NOTE: Resistor leads should

be as short as possible to

minimize the amount of noise

coupled into the driver!

P2:2P2:3

Driver Output Current =

.002 X Resistor Value ( )

Ω

Current Adjust Resistor

1/8 W 1%

Ω

Figure 7.2: Current Adjust Resistor Placement

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)kaePspmA(

eulaVrotsiseR

)%1smhO(

tnerruCtuptuO

)kaePspmA(

eulaVrotsiseR

)%1smhO(

4.00024.20121

6.0 103 6.2 0031

8.02938.20041

0.1 994 0.3 0051

2.10952.30851

4.1 896 4.3 0961

6.17876.30871

8.1 788 8.3 0191

0.200010.40002

2.2 0011 - -

Table 7.1: Current Adjust Resistor Values

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 76 77

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Projecta IM2000 Instrucciones de operaciones Pagina 39

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