Quasi-Resonant PWM controller
ICE2QS03G
Data Sheet 5 V2.3, 2014-03-06
Table of Contents
Revision History...................................................................................................................................................4
Table of Contents.................................................................................................................................................5
1 Pin Configuration and Functionality ..............................................................................................7
1.1 Pin Configuration with PG-DSO-8......................................................................................................7
1.2 Pin Functionality.................................................................................................................................7
2 Representative Block Diagram .......................................................................................................8
3 Functional Description....................................................................................................................9
3.1 VCC Pre-Charging and Typical VCC Voltage During Start-up...........................................................9
3.2 Soft-start ............................................................................................................................................9
3.3 Normal Operation.............................................................................................................................10
3.3.1 Digital Frequency Reduction.......................................................................................................10
3.3.1.1 Up/down counter....................................................................................................................10
3.3.1.2 Zero crossing (ZC counter)....................................................................................................11
3.3.2 Ringing suppression time............................................................................................................12
3.3.2.1 Switch on determination ........................................................................................................12
3.3.3 Switch Off Determination ............................................................................................................12
3.3.4 Modulated gate drive ..................................................................................................................12
3.4 Current Limitation.............................................................................................................................13
3.4.1 Foldback Point Correction...........................................................................................................13
3.5 Active Burst Mode Operation ...........................................................................................................14
3.5.1 Entering Active Burst Mode Operation........................................................................................14
3.5.2 During Active Burst Mode Operation ..........................................................................................14
3.5.3 Leaving Active Burst Mode Operation ........................................................................................15
3.6 Protection Functions ........................................................................................................................16
4 Electrical Characteristics..............................................................................................................17
4.1 Absolute Maximum Ratings .............................................................................................................17
4.2 Operating Range..............................................................................................................................17
4.3 Characteristics .................................................................................................................................18
4.3.1 Supply Section............................................................................................................................18
4.3.2 Internal Voltage Reference .........................................................................................................18
4.3.3 PWM Section ..............................................................................................................................19
4.3.4 Current Sense.............................................................................................................................19
4.3.5 Soft Start.....................................................................................................................................19
4.3.6 Foldback Point Correction...........................................................................................................19
4.3.7 Digital Zero Crossing ..................................................................................................................20
4.3.8 Active Burst Mode.......................................................................................................................20
4.3.9 Protection....................................................................................................................................21
4.3.10 Gate Drive...................................................................................................................................21
5 Outline Dimension .........................................................................................................................22
6 Marking ...........................................................................................................................................23