Pcb Layout Recommendation; Product Portfolio Quasi Resonant Coolset - Infineon CoolSET ICE2QR 80 Series Design Manual

7

PCB Layout Recommendation

In power supply system, PCB layout is a key point for a successful design. Following are some suggestions
for this (refer to application circuit in Figure 9).

Minimize the loop with pulse share current or voltage; examples are the loop formed by the bus
voltage source, primary winding, main switch and current sensing resistor or the loop consisting of
secondary winding, output diode and output capacitor, or the loop of VCC power supply.

Good grounding of the CoolSET; as the CoolSET sees every signal to the reference point of the
CoolSET ground which is also the ground of the VCC power supply, it is advisable that the ground of
the CoolSET is connected to the bus voltage ground through a short and thick PCB track in a star
structure. Note that ground of CoolSET is treated as small signal ground and the R
and primary ground of auxiliary winding of the transformer are treasted as power loop ground. It
needs to be separated before connected to the bulk capacitor ground.

Good grounding of other parts/functions. This includes the CoolSET ground, FB loop ground, ZC loop
ground and the VCC loop ground. It is advisable that all the above grounds connected to the
CoolSET ground and then connected to the bus voltage ground using a star-structure.

Power loop grounds can connect to bulk capacitor ground directly and separately; such as EMI filter
return ground Y capacitor, C15, auxiliary winding ground of transformer and the R

The high voltage pins are connected to bus voltage in typical applications. During lightning surge test,
the noise on bus voltage is high. It is suggested that the track to high voltage pin shall be kept away
from other small signal tracks. The distance is better to be more than 3mm.
8

Product Portfolio Quasi Resonant CoolSET

Type Package
ICE2QR0665 DIP-8
ICE2QR1765 DIP-8
ICE2QR4765 DIP-8
ICE2QR0665Z DIP-7
ICE2QR1065Z DIP-7
ICE2QR1765Z DIP-7
ICE2QR4765Z DIP-7
ICE2QR0665G DSO-12
ICE2QR1765G DSO-12
ICE2QR4765G DSO-12
ICE2QR0680Z DIP-7
ICE2QR2280Z DIP-7
ICE2QR4780Z DIP-7
ICE2QR2280G DSO-12
1
Typical value @ T =25°C
j
2
DFR=Digital Frequency Reduction; PPL= Peak Power Limitation
3
T =110°C
j
4
Calculated maximum input power in an open frame design at T
5
T =110°C
j
6
Calculated maximum input power in an open frame design at T
7
Calculated maximum input power in an open frame design at T
Design Guide
1
MOSFET R
DSon
V
DS
0.65 Ω
3
650V
1.7 Ω
650V 3
4.7 Ω
3
650V
0.65 Ω
650V 3
0.92Ω
3
650V
1.7 Ω
3
650V
4.7 Ω
3
650V
0.65 Ω
5
650V
1.7 Ω
650V 3
4.7 Ω
3
650V
0.65 Ω
800V
2.2 Ω
800V
4.7 Ω
800V
2.2 Ω
800V
=50°C, T
a
=50°C, T
a
=50°C, T
a
22
Quasi-resonant CoolSET design guide
®
Input power Input power
230 V (85-265) V
AC
4
88W 50W
56W 4 33W
4
30W 19W
79W 4 45W
4
71.6W 41.0W
4
54.8W 30.6W
4
31W 18W
6
79W 45W
49W 4 28W
4
29W 17W
7
102W 57W
53W 5 30W
5
39W 22W
51W 5 30W
=125°C and without copper area heat sink.
j
=125°C and without copper area heat sink.
j
=125°C and with 232mm
j
ICE2QRxx65/80x
resistor ground
CS
resistor.
CS
Features
AC
4
DFR, PPL
4 DFR, PPL
4
DFR, PPL
4 DFR, PPL
4
DFR, PPL
4
DFR, PPL
4
DFR, PPL
4
DFR, PPL
4 DFR, PPL
4
DFR, PPL
5
DFR, PPL, 800V
5 DFR, PPL, 800V
5
DFR, PPL, 800V
5 DFR, PPL, 800V
2
2 oz copper area heat sink.
8 August 2011
2