BD7F105EFJ-C
Contents
General Description........................................................................................................................................................................1
Features..........................................................................................................................................................................................1
Key Specifications ..........................................................................................................................................................................1
Package..........................................................................................................................................................................................1
Applications ....................................................................................................................................................................................1
Typical Application Circuit...............................................................................................................................................................1
Contents .........................................................................................................................................................................................2
Pin Configuration ............................................................................................................................................................................3
Pin Descriptions..............................................................................................................................................................................3
Block Diagram ................................................................................................................................................................................3
Description of Blocks ......................................................................................................................................................................4
1
2
3
4
5
6
7
8
9
INTERNAL REGULATOR ....................................................................................................................................................4
Input Low Voltage Lock Out (UVLO) ....................................................................................................................................4
Thermal Shutdown (TSD) ....................................................................................................................................................5
SW VOLTAGE DETECTION ................................................................................................................................................5
SOFT START.......................................................................................................................................................................5
PWM COMPARATOR ..........................................................................................................................................................5
ADAPTIVE ON TIME CONTROLLER..................................................................................................................................5
Maximum Frequency Limit Function (MAX FREQ) ..............................................................................................................5
DRIVER ...............................................................................................................................................................................5
10 Nch MOSFET.......................................................................................................................................................................5
11 LOAD COMPENSATION .....................................................................................................................................................6
12 Frequency Spectrum Spread (SPECTRUM SPREAD) ........................................................................................................6
13 Over Current Protection (OCP), Battery Short Protection (BSP)..........................................................................................6
14 Short Circuit Protection (SCP), REF Pin Open Protection (REFOPEN)...............................................................................7
Absolute Maximum Ratings ............................................................................................................................................................8
Thermal Resistance........................................................................................................................................................................8
Recommended Operating Conditions.............................................................................................................................................8
Electrical Characteristics.................................................................................................................................................................9
Typical Performance Curves.........................................................................................................................................................10
Application Examples ...................................................................................................................................................................18
1
2
3
4
5
6
7
8
9
Output Voltage ...................................................................................................................................................................18
Transformer........................................................................................................................................................................20
Output Capacitor................................................................................................................................................................22
Input Capacitor...................................................................................................................................................................22
Secondary Output Diode....................................................................................................................................................23
Output Resistor and Output Zener Diode (Minimum Load Current) ...................................................................................23
Snubber Circuit ..................................................................................................................................................................24
Setting of SDX/EN Pin Resistor .........................................................................................................................................24
The Output Voltage Compensation Function by L_COMP Pin Resistor.............................................................................25
10 The Influence to Frequency and Output Voltage for Each Load.........................................................................................26
I/O Equivalence Circuits................................................................................................................................................................27
Operational Notes.........................................................................................................................................................................28
Ordering Information.....................................................................................................................................................................30
Marking Diagram ..........................................................................................................................................................................30
Physical Dimension and Packing Information...............................................................................................................................31
Revision History............................................................................................................................................................................32
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