ICE3BRXX65J(Z)(G)
Application Note
20
2010-06-20
The major assumption for the calculation is listed below.
1. Reflection voltage from secondary side to primary side is 100V.
2. The maximum power for the device is estimated when the junction temperature of the integrated
CoolMOS
®
reaches 125°C. (With some margins to reach the over temperature protection of the
device : 130°C). The maximum R
dson
of the device at 125°C is taken for calculation.
3. There is no copper area as heatsink and the R
thja
=90K/W for DIP-8, R
thja
=96K/W for DIP-7 &
R
thja
=110K/W for DSO-16/12.
4. Saturation current (I
d_max
@ 125°C) of the MOSFET is considered. The voltage drop for the bridge
rectifier is assumed to be 1V. The typical resistance of the EMI filter is estimated for different
CoolSET. Those parameters are listed in the below table
Rdson_125°C
(
Ω
) I
d_max
@125°C (A)
R
EMI_filter
(
Ω
) V
F_bridge
(V)
ICE3BR0665J(Z)
1.58
9.95
2 * 0.56
2 * 1
ICE3BR1765J(Z)
4.12
4.03
2 * 1
2 * 1
ICE3BR4765J(Z)(G)
12.5
1.67
2 * 3
2 * 1
8 Layout
Recommendation
In order to get the optimized ruggedness of the IC to the transient surge events like ESD and lightning Surge
test, the grounding of the PCB layout must be connected carefully. From the circuit diagram in Figure 5, it
indicates that the grounding for the controller can be split into several groups; signal ground, Vcc ground,
Current sense resistor ground and EMI return ground. All the split grounds should be “star” connected to the
bulk capacitor ground directly. The split grounds are described as below.
•
Signal ground includes all small signal grounds connecting to the controller GND pin such as filter
capacitor ground, C6, C7, C8 and opto-coupler ground.
•
Vcc ground includes the Vcc capacitor ground, C5 and the auxiliary winding ground, pin 2 of the power
transformer.
•
Current Sense resistor ground includes current sense resistor R4 and R4a.
•
EMI return ground includes Y capacitor, C4.
9
Product portfolio of CoolSET
®
-F3R (DIP-8, DIP-7 & DSO-16/12)
new Jitter version
Device Package
V
DS
1
Frequency
/ kHz
R
dson
/
Ω
2
P
in
85-265Vac
3
P
in
230Vac±15%
3
ICE3BR0665J PG-DIP-8
650V 65
0.65
49W
74W
ICE3BR1765J PG-DIP-8
650V 65
1.70
31W
46W
ICE3BR4765J PG-DIP-8
650V 65
4.70
18W
27W
ICE3BR0665JZ PG-DIP-7 650V 65
0.65
47W
71W
ICE3BR1765JZ PG-DIP-7 650V 65
1.70
29.5W
44.5W
ICE3BR4765JZ PG-DIP-7 650V 65
4.70
18W
26W
ICE3BR4765JG PG-DSO-16/12 650V
65
4.70
16.5W
24W
1
Tj=110°C
2
Typ @ 25°C
3
Calculated maximum input power rating at T
a
=50°C, T
j
=125°C and without copper area as heat sink. Refer to the input power curve
for other T
a