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LM2578A 데이터시트(PDF) 10 Page - Texas Instruments |
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LM2578A 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 30 page LM2578A, LM3578A SNVS767E – AUGUST 2000 – REVISED APRIL 2013 www.ti.com Figure 16. Current Limit, Vin Referred CURRENT LIMIT TRANSIENT SUPPRESSION When noise spikes and switching transients interfere with proper current limit operation, R1 and C1 act together as a low pass filter to control the current limit circuitry's response time. Because the sense current of the current limit terminal varies according to where it is referenced, R1 should be less than 2 k Ω when referenced to ground, and less than 100Ω when referenced to Vin. Figure 17. Current Limit Transient Suppressor, Ground Referred Figure 18. Current Limit Transient Suppressor, Vin Referred C.L. SENSE VOLTAGE MULTIPLICATION When a larger sense resistor value is desired, the voltage divider network, consisting of R1 and R2, may be used. This effectively multiplies the sense voltage by (1 + R1/R2). Also, R1 can be replaced by a diode to increase current limit sense voltage to about 800 mV (diode Vf + 110 mV). 10 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM2578A LM3578A |
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