Fujitsu MB39A104 manual PIN Description, Pin No Symbol Descriptions

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MB39A104

■PIN DESCRIPTION

	Pin No.	Symbol	I/O	Descriptions

	1	VCCO		Output circuit power supply terminal (Connect to same potential as VCC pin.)

	2	VH	O	Power supply terminal for FET drive circuit (VH = VCC − 5 V)

	3	OUT1	O	External Pch MOS FET gate drive terminal

	4	VS1	I	Overcurrent protection circuit input terminal

				Overcurrent protection circuit detection resistor connection terminal. Set
	5	ILIM1	I	overcurrent detection reference voltage depending on external resistor and
				internal current resource (110 ∝A at RT = 24 kΩ)

	6	DTC1	I	PWM comparator block (PWM) input terminal. Compares the lowest voltage
	6	DTC1	I	among FB1 and DTC terminals with triangular wave and controls output.


	7	VCC		Power supply terminal for reference power supply and control circuit
	7	VCC		(Connect to same potential as the VCCO terminal)
				(Connect to same potential as the VCCO terminal)

	8	CSCP		Timer-latch short-circuit protection capacitor connection terminal

	9	FB1	O	Error amplifier (Error Amp 1) output terminal

	10	−INE1	I	Error amplifier (Error Amp 1) inverted input terminal

	11	CS1		Soft-start capacitor connection terminal

	12	RT		Triangular wave oscillation frequency setting resistor connection terminal

	13	CT		Triangular wave oscillation frequency setting capacitor connection terminal

	14	CS2		Soft-start capacitor connection terminal

	15	−INE2	I	Error amplifier (Error Amp 2) inverted input terminal

	16	FB2	O	Error amplifier (Error Amp 2) output terminal

	17	VREF	O	Reference voltage output terminal

	18	GND		Output circuit ground terminal (Connect to same potential as GNDO
	18	GND		terminal.)
				terminal.)

	19	DTC2	I	PWM comparator block (PWM) input terminal. Compares the lowest voltage
	19	DTC2	I	among FB2 and DTC terminals with triangular wave and controls output.


				Overcurrent protection circit detection resistor connection terminal. Set
	20	ILIM2	I	overcurrent detection reference voltage depending on external resistor and
				internal current resource (110 ∝A at RT = 24 kΩ)

	21	VS2	I	Overcurrent protection circuit input terminal

	22	OUT2	O	External Pch MOS FET gate drive terminal

	23	GNDO		Output circuit ground terminal (Connect to same potential as GND terminal.)

	24	CTL	I	Power supply control terminal. Setting the CTL terminal at “L” level places IC
	24	CTL	I	in the standby mode.
				in the standby mode.

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Contents Features DescriptionPackage PIN Assignments MB39A104PIN Description Pin No Symbol DescriptionsBlock Diagram Recommended Operating Conditions Parameter Symbol Condition Rating Unit Min MaxParameter Symbol Condition Value Unit Min Typ Absolute Maximum RatingsMin Typ Max Electrical CharacteristicsParameter Pin No ConditionsPin No Conditions Value Unit Min Parameter SymbolReference Voltage vs. Ambient Temperature Typical CharacteristicsTriangular 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 tableSetting the Triangular Oscillation Frequency Setting the Output VoltageSetting the SOFT-START and Discharge Times MB39A104 Without Setting Soft-Start Time Treatment Without Using CS TerminalOvercurrent detection circuit About TIMER-LATCH Protection CircuitMethod to detect by mean current Overcurrent Protection Circuit Range of OperationTimer-latch short-circuit protection circuit Resetting the Latch of Each Protection Circuit Treatment Without Using Cscp TerminalEquivalent Circuit On Power on OFF Standby mode Component Specification Vendor Parts ListCH1 Selection of ComponentsCH2 = 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 DataSwitching Wave Form CH1 Part number Package Remarks Usage PrecautionOrdering Information Do not apply negative voltagesIndex Package DimensionsFujitsu Limited