поискавой системы для электроныых деталей |
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SI9750CY-T1-E3 датащи(PDF) 4 Page - Vishay Siliconix |
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SI9750CY-T1-E3 датащи(HTML) 4 Page - Vishay Siliconix |
4 / 8 page Si9750 Vishay Siliconix www.vishay.com 4 Document Number: 70028 S-40754—Rev. D, 19-Apr-04 FUNCTIONAL DESCRIPTION The Si9750 together with an n-channel MOSFET provides the following functions: D limits di/dt current for hot insertion applications D provides complete short circuit protection D high-side drive allows n-channel MOSFET to be used, for lower power dissipation D industry-standard microprocessor reset function D logic control input and outputs Setting the Current Limit (SENSE, HI/LO pins, RLIMSET, RSENSE) The current limit point is determined by the voltage across RSENSE, the value of RLIMSET, and the bias current. The current limit circuit is shown in Figure 1 The steady state current is set by the equation: ILOAD x RSENSE > IBIAS x RLIMSET (1) Due to the highly capacitive nature of some loads, the Si9750 has an option to increase the current limit point to a much higher level at turn-on. In this case, turn-on is defined as VGATE < VDD + 7.8 V. This function is implemented with the HI/LO pin. If the HI/LO pin is tied low the current limit is 20% higher during turn-on than the steady state current limit point. (2) ILOAD x RSENSE > 1.2 x IBIAS x RLIMSET (with pin HI/LO=Low) If a higher current limit is needed at start-up, the HI/LO pin can be tied high. The equation becomes: (3) ILOAD x RSENSE >1.2 x IBIAS x RLIMSET + IBIAS(1 kW + RHI) (HI/LO = High) Notice that any current limit can be set at turn-on using an optional resistor, RHI. Relaxation Mode Current Limit (CRETRY pin) In an overload condition, the Si9750 will go into a relaxation mode current limit operation that not only protects the source and load, but also reduces the power dissipated in the MOSFET. When an overload is detected, the circuit quickly turns off, then goes into a retry mode whereby the current is ramped up slowly. If the fault still exists, the current will ramp down again. This sequence will repeat indefinitely at a period defined by 106 x CRETRY until the fault is removed. Typically, capacitors in the range of 1 nF to 1 mF can be used on CRETRY, but the period should be >50 ms. FIGURE 1. − + Overcurrent LIMSET IBIAS RLIMSET 1 kW, "20% SENSE RHI (Optional) RSENSE HI/LO HI/LO ILOAD VLOAD GATE VDD Si9750 330 W 33 nF 330 W |
Аналогичный номер детали - SI9750CY-T1-E3 |
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Аналогичное описание - SI9750CY-T1-E3 |
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