78S40 DATASHEET PDF

Universal Switching. Regulator Subsystem. The switching output can drive external. Some of the features are wide—supply voltage. Some of the applications include use in step—up, step—down, and.

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Regulator Subsystem. The switching output can drive external. Some of the features are wide—supply voltage. Some of the applications include use in step—up, step—down, and. CASE Simplified Block Diagram. Gnd Capacitor VCC. CT Ipk. Input Input Op Amp. Emitter Anode Cathode. Bottom View. Diode Cathode 1. Diode Anode 2. Switch Emitter 3. Op Amp Output 4.

VCC Op Amp 5. Op Noninv. Amp Inv. Input 7. Reference 8. Top View. Rev 1. Figure 7. Inverting Converter. Design Formula Table. Ipk switch. Vin min — Vsat — Vout. Vout — VF Vin min. Vin min Vsat.

L min. Vin min — Vsat ton max. Vin min — Vsat. The following power supply characteristics must be chosen:. If this voltage is not constant, then use Vin max for step—down and Vin min for step—up and inverting convertor. Iout — Desired output current.

Vripple pp — Desired peak—to—peak output ripple voltage. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation. See Application Note AN for further information. Some of the features are wide—supply voltage range, low standby current, high efficiency and low drift. Some of the applications include use in step—up, step—down, and inverting regulators, with extremely good results obtained in battery— operated systems. Input 9 Inv. Input 7 Reference 8 11 Ground 10 Comparator Inv.

Input 9 Comparator Noninv. R1 Iout — Desired output current. National Semiconductor. ON Semiconductor. Fairchild Semiconductor.

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