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LM3578AMX Datasheet(PDF) 11 Page - Texas Instruments |
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LM3578AMX Datasheet(HTML) 11 Page - Texas Instruments |
11 / 30 page LM2578A, LM3578A www.ti.com SNVS767E – AUGUST 2000 – REVISED APRIL 2013 Figure 19. Current Limit Sense Voltage Multiplication, Ground Referred Figure 20. Current Limit Sense Voltage Multiplication, Vin Referred UNDER-VOLTAGE LOCKOUT Under-voltage lockout is accomplished with few external components. When Vin becomes lower than the zener breakdown voltage, the output transistor is turned off. This occurs because diode D1 will then become forward biased, allowing resistor R3 to sink a greater current from the non-inverting input than is sunk by the parallel combination of R1 and R2 at the inverting terminal. R3 should be one-fifth of the value of R1 and R2 in parallel. Figure 21. Under-Voltage Lockout MAXIMUM DUTY CYCLE LIMITING The maximum duty cycle can be externally limited by adjusting the charge to discharge ratio of the oscillator capacitor with a single external resistor. Typical values are 50 μA for the charge current, 450 μA for the discharge current, and a voltage swing from 200 mV to 750 mV. Therefore, R1 is selected for the desired charging and discharging slopes and C1 is readjusted to set the oscillator frequency. Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM2578A LM3578A |
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