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AN3981 Datasheet(PDF) 43 Page - STMicroelectronics |
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AN3981 Datasheet(HTML) 43 Page - STMicroelectronics |
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43 / 54 page  AN3981 Common application information Doc ID 022217 Rev 1 43/54 Figure 52. Example of current regulation for more devices at the same time Each device has the setting resistor (RSET) connected to the REXT pin. This resistor has the same value for all devices. The current is adjusted by changing the value of RREG (in this case it is a trimmer). The maximum current programmed in all devices is achieved with a minimum value of RREG, whereas the minimum current is achieved with the highest value of RREG. The value of the programmed current in each channel can be calculated using the following relation: Equation 16 where: ● VREF = 1.25 V ● k depends on the device (k=64 for STP04CM05, k=16 for all other devices) ● n is the number of devices. The curve in Figure 53 shows the relation between the channel current and RREG for different values of RSET (the curve refers to all devices except the STP04CM05). Figure 53. Channel current vs. RREG SET SET REG REG REF REF CH R k R R n R V n V I ⋅ ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ + ⋅ ⋅ ⋅ − = |
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