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The LM1578A is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost, and inverting configurations. The LM1578A features a unique comparator input stage which not only has separate pins for both the inverting and non-inverting inputs, but also provides an internal 1.0V reference to each input,thereby simplifying circuit design and p.c. board layout. The output can switch up to 750mA and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal may be referenced to either the ground or the Vin terminal, depending upon the application. In addition, the LM1578A has an on board oscillator, which sets the switching frequency with a single external capacitor from < 1Hz to 100kHz (typical).
The LM1578A is an improved version of the LM1578, offering higher maximum ratings for the total supply voltage and output transistor emitter and collector voltages.
6371 Maximum Ratings
Total Supply Voltage 50V Collector Output to Ground -0.3V to +50V Emitter Output to Ground (Note 2) -1V to +50V Power Dissipation (Note 3) Internally Limited Output Current 750mA Storage Temperature -65 C to +150 C Lead Temperature (Soldering, 10 seconds) 300 C Maximum Junction Temperature 150 C ESD Tolerance (Note 4) 4kV Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions.
Note 2: For Tj > 100 C, the Emitter pin voltage should not be driven more than 0.6V below ground (see Application Information).
Note 3: At elevated temperatures, devices must be derated based on package thermal resistance. The device in the TO-99 package must be derated at 150 C/W, junction to ambient, or 45 C/W junction to case. The device in the 8-pin DIP must be derated at 95 C/W, junction to ambient. The device in the surface-mount package must be derated at 150 C/W, junction-to-ambient.
Note 4: Human body model, 1.5k Ohm in series with 100pF.
6371 Features
- Inverting and non-inverting feedback inputs - 1.0V reference at inputs - Operates from supply voltages of 2V to 40V - Output current up to 750mA, saturation less than 0.9V - Current limit and thermal shut down - Duty cycle up to 90%
6371 Typical Application
- Switching regulators in buck, boost, inverting, and single-ended transform transformer configurations - Motor speed control - Lamp flasher