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LM3676 Arkusz danych(PDF) 11 Page - Texas Instruments |
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LM3676 Arkusz danych(HTML) 11 Page - Texas Instruments |
11 / 25 page VOUT TIME (4 Ps/DIV) 200 mA/DIV IL VSW 2V/DIV 20 mV/DIV AC Coupled VIN = 3.6V VOUT = 1.5V IOUT = 20 mA VOUT TIME (200 ns/DIV) 200 mA/DIV IL VSW 2V/DIV 10 mV/DIV AC Coupled VIN = 3.6V VOUT = 1.5V IOUT = 400 mA LM3676 www.ti.com SNVS426C – NOVEMBER 2006 – REVISED MAY 2013 Figure 26. Typical PWM Operation Internal Synchronous Rectification While in PWM mode, the LM3676 uses an internal NFET as a synchronous rectifier to reduce rectifier forward voltage drop and associated power loss. Synchronous rectification provides a significant improvement in efficiency whenever the output voltage is relatively low compared to the voltage drop across an ordinary rectifier diode. Current Limiting A current limit feature allows the LM3676 to protect itself and external components during overload conditions. PWM mode implements current limiting using an internal comparator that trips at 1020 mA (typ). If the output is shorted to ground the device enters a timed current limit mode where the NFET is turned on for a longer duration until the inductor current falls below a low threshold. This allows the inductor current more time to decay, thereby preventing runaway. PFM OPERATION At very light load, the converter enters PFM mode and operates with reduced switching frequency and supply current to maintain high efficiency. The part automatically transitions into PFM mode when either of two conditions occurs for a duration of 32 or more clock cycles: A. The NFET current reaches zero. B. The peak PMOS switch current drops below the IMODE level, (Typically IMODE < 30mA + VIN/42 Ω ). Figure 27. Typical PFM Operation Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3676 |
Podobny numer części - LM3676_15 |
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Podobny opis - LM3676_15 |
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