Treatment Without Using Cscp Terminal | Fujitsu MB39A104 manual

MB39A104

■TREATMENT WITHOUT USING CSCP TERMINAL

When not using the timer-latch short-circuit protection circuit, connect the CSCP terminal (pin 8) to GND with the shortest distance.

•Treatment without using CSCP

GND 18

8CSCP

■RESETTING THE LATCH OF EACH PROTECTION CIRCUIT

When the overcurrent, or short-circuit protection circuit detects each abnormality, it sets the latch to fix the output at the "L" level.

To reset the actuated protection circuit, either the power supply turn off and on again or set the CTL terminal (pin 24) to the "L" level to lower the VREF terminal (pin 17) voltage to 2.4 V (Min) or less.

20

Image 20

Fujitsu MB39A104 manual Treatment Without Using Cscp Terminal, Resetting the Latch of Each Protection Circuit

Contents

Package FeaturesDescription MB39A104 PIN Assignments Pin No Symbol Descriptions PIN Description Block Diagram Parameter Symbol Condition Rating Unit Min Max Parameter Symbol Condition Value Unit Min TypAbsolute Maximum Ratings Recommended Operating Conditions Electrical Characteristics ParameterPin No Conditions Min Typ Max Parameter Symbol Pin No Conditions Value Unit Min Typical Characteristics Reference Voltage vs. Ambient Temperature Triangular 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 circuit Setting the Output Voltage Setting the Triangular Oscillation Frequency Setting the SOFT-START and Discharge Times MB39A104 Treatment Without Using CS Terminal Without Setting Soft-Start Time About TIMER-LATCH Protection Circuit Overcurrent detection circuit Overcurrent Protection Circuit Range of Operation Method to detect by mean current Timer-latch short-circuit protection circuit Treatment Without Using Cscp Terminal Resetting the Latch of Each Protection Circuit Equivalent Circuit On Power on OFF Standby mode Parts List Component Specification Vendor Selection of Components CH1 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 Reference Data Total Efficiency vs. Input Voltage Switching Wave Form CH1 Usage Precaution Ordering InformationDo not apply negative voltages Part number Package Remarks Package Dimensions Index Fujitsu Limited