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LM3578AM Datasheet(PDF) 9 Page - Texas Instruments

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Part # LM3578AM
Description  LM2578A/LM3578A Switching Regulator
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3578AM Datasheet(HTML) 9 Page - Texas Instruments

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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
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