Table of contents
Product highlights .......................................................................................................................... 1
Features ........................................................................................................................................ 1
Applications ................................................................................................................................... 1
Product validation .......................................................................................................................... 1
Description .................................................................................................................................... 1
Output power of 5
th
generation Fixed-Frequency CoolSET™ ................................................................. 2
Table of contents ............................................................................................................................ 3
1 Pin configuration and functionality .......................................................................................... 5
2 Representative block diagram ................................................................................................. 7
3 Functional description ............................................................................................................ 8
3.1 V
CC
pre-charging and typical V
CC
voltage during start-up ....................................................................... 8
3.2 Soft-start .................................................................................................................................................. 9
3.3 Normal operation .................................................................................................................................... 9
3.3.1 PWM operation and peak current mode control .............................................................................. 9
3.3.1.1 Switch-on determination.............................................................................................................. 9
3.3.1.2 Switch-off determination ............................................................................................................. 9
3.3.2 Current sense ................................................................................................................................... 10
3.3.3 Frequency reduction ........................................................................................................................ 11
3.3.4 Slope compensation ........................................................................................................................ 11
3.3.5 Oscillator and frequency jittering .................................................................................................... 12
3.3.6 Modulated gate drive ....................................................................................................................... 12
3.4 Peak current limitation ......................................................................................................................... 12
3.4.1 Propagation delay compensation ................................................................................................... 12
3.5 Active Burst Mode (ABM) with selectable power level ......................................................................... 14
3.5.1 Entering ABM operation ................................................................................................................... 14
3.5.2 During ABM operation ...................................................................................................................... 14
3.5.3 Leaving ABM operation .................................................................................................................... 14
3.5.4 ABM configuration ............................................................................................................................ 16
3.6 Non-isolated/isolated configuration .................................................................................................... 16
3.7 Protection functions ............................................................................................................................. 17
3.7.1 Line over voltage .............................................................................................................................. 17
3.7.2 V
CC
over/under voltage ..................................................................................................................... 17
3.7.3 Overload/ open loop ........................................................................................................................ 17
3.7.4 Over temperature ............................................................................................................................. 17
3.7.5 V
CC
short to GND................................................................................................................................ 18
3.7.6 Protection modes ............................................................................................................................. 18
4 Electrical characteristics ........................................................................................................ 20
4.1 Absolute maximum ratings ................................................................................................................... 20
4.2 Operating range .................................................................................................................................... 21
4.3 Operating conditions ............................................................................................................................ 21
4.4 Internal voltage reference ..................................................................................................................... 22
4.5 PWM section .......................................................................................................................................... 22
4.6 Error amplifier ....................................................................................................................................... 23
4.7 Current sense ......................................................................................................................................... 23
4.8 Soft start ................................................................................................................................................ 23
4.9 Active Burst Mode .................................................................................................................................. 24
