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LM2578AMX Scheda tecnica(PDF) 10 Page - Texas Instruments

Il numero della parte LM2578AMX
Spiegazioni elettronici  LM2578A/LM3578A Switching Regulator
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Produttore elettronici  TI [Texas Instruments]
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LM2578AMX Scheda tecnica(HTML) 10 Page - Texas Instruments

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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
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