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VNF9D5F Datasheet(PDF) 18 Page - STMicroelectronics |
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VNF9D5F Datasheet(HTML) 18 Page - STMicroelectronics |
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18 / 106 page  Table 12. FIXED_DROP table FIXED_DROP(m) IOUT range 16 0.25*INOM ÷ 0 8 0.5*INOM ÷ 0.25*INOM 4 0.75*INOM ÷ 0.5*INOM 1 INOM ÷ 0.75*INOM The concept of up and down-counting for RMS current control is illustrated in the figure below: Figure 10. I²t counter with varying INOM latch and unlatch Inom Counter Max Unlatch by SPI or DIN SOCRx, DINx I²t latch IOUT I²t counter The last (13th) step of the I²t protection staircase curve is equal to 10 * INOM. Whenever the load current exceeds the 13th threshold, the output channel is latched off immediately within tdoff + tf, protecting the integrity of the board net power supply. The I²t block is supplied from an internal voltage regulator supplied by VREG. Therefore, as soon as VREG drops below VREG_POR_L, the accumulated I²t counter value is reset and the device enters in sleep mode. VNF9D5F Protections DS13946 - Rev 6 page 18/106 |
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