Cirrus-logic AN368 Manual do Utilizador descarregar pdf (Página 28)

AN368

28 AN368REV2

Time T2

CHx

offset delays cause errors when calculating average current regulation using Equations 27 and

28. Averaged output current I

MODEx

of a flyback converter is illustrated in Figure 10.

AUX

Zero-cross

Detection

D15

R22

Sense

R23

CS1630 /31

FBAUX

GND

FBSENSE

TX1

BST

Snubber

MOD E x

Synchr onizer

Circuit

Sense

C15

Channel 1 LED

(White)

Channel 2 LED

(Red)

MODE x

PRI

GND

IGND

Drain

Figure 10. Flyback Configuration

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 79 80

Application Note 1
TRIAC Dimmable SSL Circuit 1
Risk of Electric Shock 2
TABLE OF CONTENTS 3
2 Introduction 6
2.1 Definition of Acronyms 7
2.2 Definition of Symbols 8
3 Design Process 9
3.1 Operating Parameters 9
3.2 Design Process 10
3.3 Design Procedure 11
Overshoot 13
Reflected 13
[Eq. 10] 15
[Eq. 7] 15
[Eq. 8] 15
[Eq. 9] 15
[Eq. 34] 19
[Eq. 35]N 19
[Eq. 36] 19
[Eq. 37] 20
[Eq. 38] 20
= 2  50ns 21
7+= 50 ns 21
22
[Eq. 44] 23
[Eq. 45] 23
[Eq. 46] 24
[Eq. 47] 24
[Eq. 48] 24
[Eq. 49] 24
[Eq. 50] 25
[Eq. 51] 26
[Eq. 52] 27
CS1630 /31 28
CHx_OFF[2:0] 50ns= 29
CH1CompGain 30
CH2CompGain 30
Synchronizer 33
[Eq. 58] 34
[Eq. 60] 36
[Eq. 61] 36
[Eq. 62] 36
3.4 Boost Stage Design 37
Inductance 39
3.5 Completing the Design 40
[Eq. 67] 41
[Eq. 68] 41
[Eq. 69] 41
[Eq. 70] 43
[Eq. 71] 44
[Eq. 72] 45
[Eq. 73] 45
CS1630/31 46
[Eq. 77] 47
+ [3:0] 4 = 47
[Eq. 78] 47
[Eq. 79] 48
 1 + 5= 49
4 Design Example 52
4.1 Design Steps 52
[Eq. 108] 56
[Eq. 109] 56
[Eq. 110] 56
[Eq. 111] 56
[Eq. 112] 56
[Eq. 113] 57
[Eq. 114] 57
[Eq. 115] 57
[Eq. 116] 57
[Eq. 117] 57
[Eq. 118] 58
[Eq. 119] 58
[Eq. 120] 58
[Eq. 121] 58
[Eq. 122] 58
4 1+1615+18– 8 + 59
[Eq. 125] 60
[Eq. 126] 60
[Eq. 127] 60
[Eq. 128] 60
[Eq. 129] 60
[Eq. 130] 61
4.2 Boost Stage Design 63
[Eq. 133] 64
[Eq. 134] 64
[Eq. 135] 64
[Eq. 136] 64
[Eq. 137] 64
4.3 Completing the Design 65
[Eq. 142] 68
[Eq. 143] 68
5 Appendix 70
5.1 OTP Memory Map 70
AN368REV2 71 71
72 AN368REV2 72
AN368REV2 73 73
74 AN368REV2 74
AN368REV2 75 75
5.2 Schematic 76
5.3 Dimensions 77
5.4 Bill of Materials 78
79 AN368REV2 79
Figure 26. BOM (Page 2 of 2) 79
Revision History 80

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