Fujitsu MB3788 manual How To Set Output Voltage, ⋅ R, Vref, Vout =

Models: MB3788

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Page 12

MB3788

VREF

R R1

R R2

RNF

Note: Set the output voltage in the positive range (VOUT > 0).

Image 12

Contents

FEATURES FUJITSU SEMICONDUCTOR DATA SHEETDESCRIPTION PACKAGEMB3788 PIN ASSIGNMENTContinued PIN DESCRIPTION Pin NoPin name DescriptionsBLOCK DIAGRAM MB37881 Reference voltage power circuit 2 Error amplifierPower circuit FUNCTIONAL DESCRIPTION1 Timer and latch-type short-circuit protection circuit 3. Protection Functions2 Low input voltage malfunction fail-safe circuit MB3788Symbol ABSOLUTE MAXIMUM RATINGSRECOMMENDED OPERATING CONDITIONS ParameterELECTICAL CHARACTERISTICS ValueSymbol MB3788Symbol MB3788Continued ParameterSTANDARD CHARACTERISTIC CURVES 3.Reference voltage, output current setting pin voltageMB3788 ContinuedMB3788 ContinuedHOW TO SET OUTPUT VOLTAGE MB3788⋅ R VREFHOW TO SET OUTPUT CURRENT MB3788MB3788 VPE = 50 mV + tPE ⋅ 10-6/CPE 0.65 = 50 mV + tPE ⋅ 10-6/CPEPROCESSING WITHOUT USING SCP PIN Fig. 6 Processing without using SCP PinMB3788 MB3788 Fig. 7 Basic Voltage-Drop Type DC/DC Converter CircuitFig. 10 DC/DC Converter A V - φ Characteristic Measurement Diagram Fig. 11 Gain - Frequency CharacteristicFig.12 Phase - Frequency Characteristic Curves MB3788APPLICATION CIRCUIT MB3788NOTES ON USE ORDERING INFORMATIONPart number PackagePACKAGE DIMENSION Note 4 Pins width do not include tie bar cutting remainderMB3788 Note 1 *1FUJITSU LIMITED MB3788