Cirrus Logic CS160x User Manual
An346, Introduction
Copyright
Cirrus Logic, Inc. 2011
(All Rights Reserved)
http://www.cirrus.com
Application Note
CS150x & CS160x PCB LAYOUT GUIDELINES
1. INTRODUCTION
The CS150x & CS160x are high-performance variable frequency discontinuous conduction mode (VF-
DCM), active digital power factor correction (PFC) controllers. The CS1500/CS1501 are intended for use
in power supplies, and the CS1600/CS1601 are targeted for lighting applications.
This document describes best layout practices for these devices, using the CS1500/CS1600 &
CS1501/CS1601 90W PFC demonstration board, CDB150x as an example. This board has dual
footprints to allow either the CS1500/CS1600 or CS1501/CS1601 to be fitted. The layout guidelines
presented in this application note are also applicable to lighting designs. In this document, all references
will be to the CS1500 and CS1501.
Note: The CS1501 uses two additional pins. Pin 4 (CS) is used for current sense. Pin 5 (ZCD) is used for
zero current detection (valley switching detection). These pins are not present on the CS1500 and are not
connected. Although these functions are not present on the CS1500, the general layout principles are the
same. For a full description of these functions, please refer to the CS1501 & CS1601 data sheets
Figure 1. Schematic of a 90W PFC System with CS1500/CS1501
In the schematic above U1 refers to CS1501 and U2 refers to CS1500. Assembly instructions are
provided for using either the CS1500 or CS1501.
MUR160
F1
4A
t
NTC1
30
NO POP - SHORT WITH 28 AWG WIRE
C1
2200pF
C2
2200pF
C3
0.22uF
C4
0.22uF
+
-
BR1
GBU4J-BP
600V
C5
NO POP
D1
C6
0.33uF
D2
MUR460G
600V
t
NTC2
30
NO POP, SHORT WITH AWG28 WIRE
R8
20K
1
2
CON2
TERM BLK
1
2
3
CON1
TERM BLK
R3
1M
R20
1K
R6
48.7K
R2
1M
R13
1M
R18
1.78K
VZ
V300LA20AP
300V
1
2
3
4
L1
IND-5MH-TSD-2796
5mH
NO POP, SHORT PIN 1-2 & PIN 3-4 with 28 AWG wire
L2
IND-5MH-TSD-2796
5mH
1
2
3
CON3
TERM BLK
A1
1PAD-H78P108
A2
1PAD-H78P108
R19
100
C7
100uF
ELEC
R12
0
R11
1K
C10
4.7uF
1 VBIAS2
2 STBY
3 IRECT
4 ILINK
5
GND
6
GD
7
VDD
8
VBIAS1
U2
CS1500-FSZ
NO POP
HS1
12.5W
C12
100pF
S
D
G
Q1
STP12NM50FP
L3
L4
NO POP, SHORT WITH AWG28 WIRE
L5
380uH
RLCS-1007
R17
NO POP
C8
NO POP
C9
NO POP
R21
NO POP
R22
NO POP
R4
NO POP
R10
NO POP
D3
LL4148
1 IFB
2 NC
3 IAC
4 CS
5
ZCD
6
GND
7
GD
8
VDD
U1
CS1501-FSZ
C11
33pF
R14
1M
R7
4.7 OHM
TP8
TP2
TP3
TP4
TP5
TP6
TP7
R5
NO POP
R16
0
R23
0
R15
1M
JP
1
0.
800" W
IRE J
U
M
PER
C14
1000pF
X7R
NO POP
C13
1000pF
X7R
C15
1000pF
X7R
NO POP
R1
1M
R9
0.1
1W
AN346
APR ‘11
AN346REV1