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BL2555 Datasheet(PDF) 4 Page - SHANGHAI BELLING CO., LTD. |
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BL2555 Datasheet(HTML) 4 Page - SHANGHAI BELLING CO., LTD. |
4 / 7 page www.belling.com.cn 4 BL2555 REVERSE-VOLTAGE BLOCKING The reverse-voltage protection feature turns off the Power MOSFET whenever the output voltage exceeds the input voltage by 150mV (typ) for 4-ms (typ). This prevents damage to devices on the input side of the BL2555 by preventing significant current from sinking into the input capacitance. The BL2555 allow the power MOSFET to turn on once the output voltage goes below the input voltage for the same 4-ms deglitch time. APPLICATION INFORMATION INPUT OUTPUT CAPACITANCE Input and output capacitance improves the performance of the device; the actual capacitance should be optimized for the particular application. For all applications, a 4.7µF or greater ceramic bypass capacitor between IN and GND is recommended as close to the device as possible for local noise de-coupling. This precaution reduces ringing on the input due to power-supply transients. Additional input capacitance may be needed on the input to reduce voltage overshoot from exceeding the absolute maximum voltage of the device during heavy transient conditions. This is especially important during bench testing when long, inductive cables are used to connect the evaluation board to the bench power-supply. Placing a high-value electrolytic capacitor on the output pin is recommended when large transient currents are expected on the output. SETTING THE CURRENT LIMIT THRESHOLD RILIM (K) Typical Current Limit (mA) 200 138 180 152 151 179 100 266 82 324 68 389 51 520 43 612 30 873 20 1295 15.1 1705 THERMAL CONSIDERATIONS During normal operation as a switch, the power dissipated in the part will depend upon the level at which the current limit is set. The maximum allowed setting for the current limit is 1A and this will result in a power dissipation of, P = (ILIM) 2 x RDS = (1)2 x 0.10 = 100mW If the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground. This is more power than the package can dissipate, but the thermal shutdown of the part will activate to protect the part from damage due to excessive heating. A short on the output will cause the part to operate in a constant current state dissipating a worst case power of, P(max) = VIN(max) x ILIM(max) = 5.5 x 1 = 5W This large amount of power will activate the thermal shutdown and the part will cycle in and out of thermal shutdown so long as the ON pin is active and the short is present . 0 200 400 600 800 1000 1200 1400 1600 1800 0 50 100 150 200 250 Rset(Kohm) Current Limit Threshold VS RILIM Ilim |
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