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LM3578AM Datasheet(PDF) 9 Page - Texas Instruments |
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LM3578AM Datasheet(HTML) 9 Page - Texas Instruments |
9 / 30 page LM2578A, LM3578A www.ti.com SNVS767E – AUGUST 2000 – REVISED APRIL 2013 Figure 14. Value of Timing Capacitor vs Oscillator Frequency OUTPUT TRANSISTOR The output transistor is capable of delivering up to 750 mA with a saturation voltage of less than 0.9V. (see Collector Saturation Voltage and Emitter Saturation Voltage curves). The emitter must not be pulled more than 1V below ground (this limit is 0.6V for TJ ≥ 100°C). Because of this limit, an external transistor must be used to develop negative output voltages (see the Inverting Regulator Typical Application). Other configurations may need protection against violation of this limit (see the Emitter Output section of the Applications Information). CURRENT LIMIT The LM2578A's current limit may be referenced to either the ground or the Vin pins, and operates on a cycle-by- cycle basis. The current limit section consists of two comparators: one with its non-inverting input referenced to a voltage 110 mV below Vin, the other with its inverting input referenced 110 mV above ground (see FUNCTIONAL DIAGRAM). The current limit is activated whenever the current limit terminal is pulled 110 mV away from either Vin or ground. Applications Information CURRENT LIMIT As mentioned in the functional description, the current limit terminal may be referenced to either the Vin or the ground terminal. Resistor R3 converts the current to be sensed into a voltage for current limit detection. Figure 15. Current Limit, Ground Referred Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM2578A LM3578A |
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