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TD230D Arkusz danych(PDF) 10 Page - STMicroelectronics |
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TD230D Arkusz danych(HTML) 10 Page - STMicroelectronics |
10 / 15 page TD230 TD230 TD230 TD230 BOARD1 BOARD2 BOARD3 BOARDN Vcc+ P owe r S upply GND Vcc- Figure 8 : Decentralized Protection Therefore, when a fault appears on the positive rail, the definitive shutdown of the positive NMOS will lead to the shutdown of the negative NMOS, but when a fault appears on the negative rail, the definitive shutdown of the negativeNMOS will have no effect on the positive NMOS. Several possibilities are offered to reset the whole system when it has been led to definitive shutdown : • the card can be unplugged and plugged back (live insertion) • the INHIBIT pin can be set to active state dur- ing a short time (100 µs typ or more) in the case of remote control facilities 3. PERFORMANCES AND EVALUATION All the curves shown in this application note have been realized with the TD230 Evaluation Board. The external conditions and components were as listed hereafter : • Vcc+ = 5V • Vcc- = -5V • Suppliable output short circuit current = 5A • IC = TD230 • MOSFET 1 = BUZ71 • MOSFET 2 = BUZ71 • LBOOST = 220µH • CBOOST = 100nF • CTRIP1 =10µF • CTRIP2 =10µF • RS1 = 68mΩ • RS2 = 68mΩ • CSS1 = 1nF • CSS2 = 1nF • Positive Bypass = 4.7µF (plastic) • Negative Bypass = 4.7µF (plastic) The evaluation board is available and allows to test the performances of the TD230. The layout and schematic of this evaluation board are given on figures 9A-9B-9C. 4. CAUTIONS For proper use of the TD230 as a reliable protection device, a few precautions must be taken : 1. Proper bypass capacitors must be connected as close as possible to the power pins of the TD230 (PVcc, NVcc, GND). Some recommended values are given in table (a). 2. The OSCGND pin must be tied to the GND pin externally (printed board) to ensure proper step-up converter reference. If not, the step-up converter will not start. 3. The INHIBIT pin is a CMOS/TTL compatible input which should therefore not be left unconnected. The absolute maximum rating of this input is 7V. It should be tied to the TTL compatible output of an TD230 10/15 |
Podobny numer części - TD230D |
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Podobny opis - TD230D |
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