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SRK2000DTR Datasheet(PDF) 11 Page - STMicroelectronics |
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SRK2000DTR Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 19 page DocID17811 Rev 4 11/19 SRK2000 Application information 19 Solving these equations for R1 and R2 we get: Equation 4 If VCC_G is not too low (< 8 ÷ 9 V), its tolerance is not critical because it is related only to that of VEN_On (± 5.6%) and of the external resistors R1, R2 (± 1% each is recommended). Then, some care needs to be taken only as far as the selection of the -12/-25 mV threshold is concerned: in fact, the large spread of IEN considerably affects the voltage on the EN pin as the device turns on, a value that can be found by solving the first of (1) for VEN: Equation 5 A couple of examples clarify the suggested calculation methodology. Example 1 VCC_G = 10 V, VDVS1,2_Off = - 25 mV. In this case, VEN must definitely be lower than the minimum value of VEN_Th (= 0.32 V). From the second of (2), the nominal ratio of R1 to R2 is (10 – 1.8) / 1.8 = 4.555. Substituting the appropriate extreme values in (3) it must be (4.75 - 7·10-6·R1) / (1 + 4.555) < 0.32; solving for R1 yields R1 > 425 k ; let us consider an additional 4% margin to take both the tolerance and the granularity of the R1 and R2 values into account, so that: R1 > 425·1.04 = 442 k . Choose R1 = 442 k (E48 standard value) and, from the second of (2), R2 = 442/4.555 = 97 k ; use 97.6 k (E48 standard value). Example 2 VCC_G = 10 V, VDVS1,2_Off = - 12 mV. In this case, VEN must definitely be higher than the maximum value of VEN_Th (= 0.40 V). From the second of (2), the nominal ratio of R1 to R2 is (10 – 1.8) / 1.8 = 4.555. Substituting the appropriate extreme values in (3) it must be (4.25 - 13·10-6·R1) / (1 + 4.555) > 0.4; solving for R1 yields R1 < 156 k ; with 4% additional margin R1 < 156/1.04 = 150 k. Choose R1 = 147 k (E48 standard value) and, from the second of (2), R2 = 147/4.555 = 32.3 k ; use 32.4 k (E48 standard value). Note: In both examples the gate drivers are disabled as VCC falls below 9.75 V (nominal value), as the voltage on the EN pin falls 45 mV below VEN_On. 6.1.3 Remote on/off control Whichever configuration is used, since a voltage on the EN pin 45 mV below VEN_On disables the gate drivers, any small-signal transistor can be used to pull down the EN pin and force the gate drivers into an off state. Finally, it should be noted that during power-up, power-down, and under overload or short- circuit conditions, the gate drivers are shut down if the VCC voltage is insufficient: < VCCOff in On _ EN G _ CC On _ EN EN On _ EN G _ CC EN CCOn V V V 1 R 2 R I V V V V 1 R 2 R 1 R 1 1 R I V V EN CCOn EN |
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