Fujitsu MB39A104 manual

			MB39A104
• Soft-Start Circuit
VO			VREF
VO
R1			10 ∝A
	−INE1	10
		10
	(−INE2)	15
		15
R2			L priority
			L priority
			Error Amp
			−
CH ON/OFF signal		11	+
L : ON, H : OFF		11	+
L : ON, H : OFF	CS1		+
	CS1	14
	(CS2)	14	1.24 V
	CS1		1.24 V
	(CS2)
	FB1	9
	(FB2)	16	UVLO

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Image 15

Fujitsu MB39A104 manual

Contents

Features DescriptionPackage PIN Assignments MB39A104 PIN Description Pin No Symbol Descriptions Block Diagram Recommended Operating Conditions Parameter Symbol Condition Rating Unit Min MaxParameter Symbol Condition Value Unit Min Typ Absolute Maximum Ratings Min Typ Max Electrical CharacteristicsParameter Pin No Conditions Pin No Conditions Value Unit Min Parameter Symbol Reference Voltage vs. Ambient Temperature Typical Characteristics Triangular Wave Oscillation Frequency Power Dissipation vs. Ambient Temperature Functions Operating circuit Timer-latch overcurrent protection circuit block OCPUnder voltage lockout protection circuit Uvlo Protection circuit operating function table Setting the Triangular Oscillation Frequency Setting the Output Voltage Setting the SOFT-START and Discharge Times MB39A104 Without Setting Soft-Start Time Treatment Without Using CS Terminal Overcurrent detection circuit About TIMER-LATCH Protection Circuit Method to detect by mean current Overcurrent Protection Circuit Range of Operation Timer-latch short-circuit protection circuit Resetting the Latch of Each Protection Circuit Treatment Without Using Cscp Terminal Equivalent Circuit On Power on OFF Standby mode Component Specification Vendor Parts List CH1 Selection of Components CH2 = 3 2 ⋅ 0.05 ⋅ 0.174 = 0.078 W Example Peak-to-peak value ΔIL Di ≥ I O ⋅ 1 − ESR ≤ ΠfC L 050 491 ESR ≤ ΠfC L 033 364 Total Efficiency vs. Input Voltage Reference Data Switching Wave Form CH1 Part number Package Remarks Usage PrecautionOrdering Information Do not apply negative voltages Index Package Dimensions Fujitsu Limited