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TD230N Datasheet(PDF) 9 Page - STMicroelectronics |
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TD230N Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 15 page Figure 6 : Step Up Converter Rise Time Proper operation of this step-up converter is guar- anteed at as low as 2.7V with a rise time (0 to 90% of V(CBOOST)) in the range of 700 µs at 2.7V which 1 2 3 4 5 6 7 8 Vcc+ GND LBOOS T CTRIP1 CBOOS T 9 10 11 12 13 14 15 16 C ONTR OL P Vcc LBOOS T CBO OS T PM1 GND PM2 OS C GND NVcc REF1 GC 1 S ENS P INHIBIT S HUTDOWN S ENS N GC 2 REF2 RS 1 NMos to BOARD CS S 1 Figure 7 : Single Electronic Circuit Breaker Application is the worst case. At 5V, the rise time of V(Cboost) is 250 µs typ. The CBOOST voltage wave form at power ON under 5V supply voltage is shown on figure 6. Trace 1 represents the power supply voltage (0 to 5V). Trace 2 represents the CBOOST Voltage at power ON (0 to 5+13,4 = 18,4V). Table (a) summerizes the recommended values of the CBOOST and LBOOST to ensure optimized gate charge and low ripple voltage with their corre- sponding maximum current surge (IPK) and nomi- nal consumption (ICC) of the TD230 for the most common power supply values. For each power supply value is also given the recommended value of a bypass capacitor (CBY) on the power sup- plies. Note that both CBOOST and LBOOST are available in surface mount packages. Table (a) : Recommended values for Cboost and Lboost VCC + Cboost Lboost Ipk Vrip Icc Cby VnF µHmA mV mA µF 2.7 47 100 68 60 190 100 5>1 5 100 220 35 120 2.5 1 10 100 220 470 33 220 100 2.2 1 12 220 470 39 150 2.2 1 14 220 680 34 150 2.4 1 18 220 1000 31 200 2.7 1 2.4. Single Supply Breaker Application The TD230 is perfectly suited to fit in single sup- plied applications (ex 0-5V), and can drive only one power MOSFET used as high side power switch. Figure 7 shows how TD230 can be used as a single circuit breaker with the same performances. In this case, the external components consist in : one boost inductor, one sense resistor, three ca- pacitors, and one power MOSFET. 2.5. Typical Telecom Line Cards Protection Application One of the typical applications where the TD230 can display all its technical advantages is in an exchange Telecom Cards protection. Sometimes fifty cards or more are to be supplied with the same power supply (+/-5V, 1kW), and a decentralized protection is needed because one card may be faulty, but should not penalize the others with un- adapted protection system. The risk of complete breakdown of the system must be eradicated. In this application the two above described over current causes (external line perturbation or inter- nal component fault) are likely to happen. In the first case, the current limitation on each card will ensure undammagingon-board conditions, and in the sec- ond case, the faulty card will be disjoncted from the power supply until reset. Figure 8 shows a typical telecom application with decentralized protection. In this application, the positive power supply serves the logic control and analog signals whereas the negative power supply is dedicated to the analog. TD230 9/15 |
Similar Part No. - TD230N |
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Similar Description - TD230N |
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