ICE3BRXX65J(Z)(G)
Table of Contents
Page
Application Note
4
2010-06-20
1
Introduction ...................................................................................................................................5
2
List of Features .............................................................................................................................5
3
Package..........................................................................................................................................5
4
Block Diagram ...............................................................................................................................7
5
Typical Application Circuit...........................................................................................................8
6
Functional description and component design .........................................................................9
6.1
Startup time.....................................................................................................................................9
6.1.1
Vcc capacitor...................................................................................................................................9
6.2
Soft Start .......................................................................................................................................10
6.3
Low standby power - Active Burst Mode.......................................................................................10
6.3.1
Entering Active Burst Mode...........................................................................................................10
6.3.2
Working in Active Burst Mode .......................................................................................................11
6.3.3
Leaving Active Burst Mode ...........................................................................................................12
6.3.4
Minimum V
CC
supply voltage during burst mode...........................................................................13
6.4
Low EMI noise...............................................................................................................................13
6.4.1
Frequency jittering.........................................................................................................................13
6.4.2
Soft gate drive ...............................................................................................................................13
6.4.3
Other suggestions to solve EMI issue...........................................................................................14
6.5
Tight maximum power control - Propagation delay compensation ...............................................14
6.6
Protection Features.......................................................................................................................15
6.6.1
Auto Restart Protection Mode .......................................................................................................15
6.6.2
Blanking Time for over load protection .........................................................................................16
6.6.3
User defined protection by external protection enable pin............................................................17
7
Input power curve .......................................................................................................................17
8
Layout Recommendation ...........................................................................................................20
9
Product portfolio of CoolSET
®
-F3R (DIP-8, DIP-7 & DSO-16/12) new Jitter version ............20
10
Useful formula & external component design .........................................................................21
11
References ...................................................................................................................................22