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LM2735YMF Arkusz danych(PDF) 10 Page - Texas Instruments |
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LM2735YMF Arkusz danych(HTML) 10 Page - Texas Instruments |
10 / 58 page - D 1 1 1 = c D = VOUT VIN ¸ ¹ · ¨ © § LM2735 SNVS485F – JUNE 2007 – REVISED APRIL 2013 www.ti.com CURRENT LIMIT The LM2735 uses cycle-by-cycle current limiting to protect the internal NMOS switch. It is important to note that this current limit will not protect the output from excessive current during an output short circuit. The input supply is connected to the output by the series connection of an inductor and a diode. If a short circuit is placed on the output, excessive current can damage both the inductor and diode. Design Guide ENABLE PIN / SHUTDOWN MODE The LM2735 has a shutdown mode that is controlled by the Enable pin (EN). When a logic low voltage is applied to EN, the part is in shutdown mode and its quiescent current drops to typically 80 nA. Switch leakage adds up to another 1 µA from the input supply. The voltage at this pin should never exceed VIN + 0.3V. THERMAL SHUTDOWN Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 160°C. After thermal shutdown occurs, the output switch doesn’t turn on until the junction temperature drops to approximately 150°C. SOFT-START This function forces VOUT to increase at a controlled rate during start up. During soft-start, the error amplifier’s reference voltage ramps to its nominal value of 1.255V in approximately 4.0ms. This forces the regulator output to ramp up in a more linear and controlled fashion, which helps reduce inrush current. INDUCTOR SELECTION The Duty Cycle (D) can be approximated quickly using the ratio of output voltage (VO) to input voltage (VIN): (1) 10 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM2735 |
Podobny numer części - LM2735YMF |
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Podobny opis - LM2735YMF |
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