Fujitsu MB39A104 manual Reference Data, Total Efficiency vs. Input Voltage

Page 32

MB39A104

■REFERENCE DATA

TOTAL efficiency η (%)

100

90

80

70

60

50

40

30

10 m

TOTAL Efficiency vs. Input Voltage

Vin = 7 V

Vin = 10 V

Vin = 12 V

Vin = 19 V

Ta = +25 °C

5 V Output

SW1 = OFF

SW2 = ON

100 m

1

10

Input voltage VIN (V)

Each CH efficiency η (%)

100

90

80

70

60

50

40

30

10 m

Each CH Efficiency vs. Input Voltage

Vin = 7 V

Vin = 10 V

Vin = 12 V

Vin = 19 V

Ta = +25 °C

3.3 V Output

SW1 = ON

SW2 = OFF

100 m

1

10

Input voltage VIN (V)

(Continued)

32

Image 32

Contents Package FeaturesDescription MB39A104 PIN AssignmentsPin No Symbol Descriptions PIN DescriptionBlock Diagram Parameter Symbol Condition Rating Unit Min Max Parameter Symbol Condition Value Unit Min TypAbsolute Maximum Ratings Recommended Operating ConditionsElectrical Characteristics ParameterPin No Conditions Min Typ MaxParameter Symbol Pin No Conditions Value Unit MinTypical Characteristics Reference Voltage vs. Ambient TemperatureTriangular Wave Oscillation Frequency Power Dissipation vs. Ambient Temperature Functions Timer-latch overcurrent protection circuit block OCP Under voltage lockout protection circuit UvloProtection circuit operating function table Operating circuitSetting the Output Voltage Setting the Triangular Oscillation FrequencySetting the SOFT-START and Discharge Times MB39A104 Treatment Without Using CS Terminal Without Setting Soft-Start TimeAbout TIMER-LATCH Protection Circuit Overcurrent detection circuitOvercurrent Protection Circuit Range of Operation Method to detect by mean currentTimer-latch short-circuit protection circuit Treatment Without Using Cscp Terminal Resetting the Latch of Each Protection CircuitEquivalent Circuit On Power on OFF Standby mode Parts List Component Specification VendorSelection of Components CH1CH2 = 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 Reference Data Total Efficiency vs. Input VoltageSwitching Wave Form CH1 Usage Precaution Ordering InformationDo not apply negative voltages Part number Package RemarksPackage Dimensions IndexFujitsu Limited