ice3ar4780jz Infineon Technologies Corporation, ice3ar4780jz Datasheet - Page 32

• Manufacturer Part Number: ice3ar4780jz
• Description: Off-line Smps Current Mode Controller With Integrated 800v Coolmos And Startup Cell Brownout & Frequency Jitter In Dip- 7
• Manufacturer: Infineon Technologies Corporation

9
Figure 41
General guideline for PCB layout design using F3 CoolSET (refer to Figure 41):
1. “Star Ground “at bulk capacitor ground, C11:
Guideline for PCB layout design when >3KV lightning surge test applied (refer to Figure 41):
1. Add spark gap
Version 2.0
2. High voltage traces clearance:
3. Filter capacitor close to the controller ground:
a. Spark Gap 3 and Spark Gap 4, input common mode choke, L1:
a. 400V traces (positive rail of bulk capacitor C11) to nearby trace: > 2.0mm
b. 600V traces (drain voltage of CoolSET IC11) to nearby trace: > 2.5mm
a. DC ground of the primary auxiliary winding in power transformer, TR1, and ground of C16 and Z11.
b. DC ground of the current sense resistor, R12
c. DC ground of the CoolSET device, GND pin of IC11; the signal grounds from C13, C14, C15 and collector of IC12
d. DC ground from bridge rectifier, BR1
e. DC ground from the bridging Y-capacitor, C4
High voltage traces should keep enough spacing to the nearby traces. Otherwise, arcing would incur.
Spark Gap 1
Spark Gap 2
Spark gap is a pair of saw-tooth like copper plate facing each other which can discharge the accumulated charge during
Gap separation is around 1.5mm (no safety concern)
surge test through the sharp point of the saw-tooth plate.
Filter capacitors, C13, C14 and C15 should be placed as close to the controller ground and the controller pin as possible
point. It can reduce the switching noise going into the sensitive pins of the CoolSET device effectively. The primary DC
grounds include the followings.
so as to reduce the switching noise coupled into the controller.
“Star Ground “means all primary DC grounds should be connected to the ground of bulk capacitor C11 separately in one
should be connected to the GND pin of IC11 and then “star “connect to the bulk capacitor ground.
GND
L
N
FUSE1
Schematic for recommended PCB layout
Y-CAP
Schematic for recommended PCB layout
C2
X-CAP
C1
C3
Y-CAP
Spark Gap 4
Spark Gap 3
F3 CoolSET schematic for recommended PCB layout
L1
C4
Y-CAP
BR1
C11
R12
C13
bulk cap
*
BA
GND
D11
CS
C14
IC11
CoolSET
F3
FB
32
C15
DRAIN
VCC
NC
Schematic for recommended PCB layout
R11
R13
Z11
R14
D11
C16
D13
C12
TR1
IC12
D21
R23
CoolSET
C21
R22
ICE3AR4780JZ
C23
IC21
C22
R25
R21
R24
26 Aug 2010
®
-F3R80
GND
Vo