ISL6730AFUZ Intersil, ISL6730AFUZ Datasheet - Page 13

• Manufacturer Part Number: ISL6730AFUZ
• Description: Power Factor Correction ICs PFC Controller
• Manufacturer: Intersil

Specifications of ISL6730AFUZ

• Rohs: yes
• Switching Frequency: 124 kHz
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: MSOP-10
• Minimum Operating Temperature: - 40 C

Table 3 shows the design parameters.
BOOST INDUCTOR SELECTION
First, calculate the maximum input RMS current, I
I
Where η is the converter efficiency at V
factor at V
Assuming the current is sinusoidal and the peak to peak ripple at
line is 40%.
The boost inductor, L
The peak current of the inductor is the sum of the average peak
inductor current and half of the peak to peak ripple current.
Select and design the boost inductor as given by Equation 11.
The ISL6730A, ISL6730B, ISL6730C, ISL6730D provides peak
current limit function that can prevent the boost inductor
saturation. Assuming 25% margin is given to the OCP threshold,
select and design the boost inductor with saturation current
given by Equation 11 with 25% more.
INPUT RECTIFIER
The maximum average input current is calculated:
I
L
I
I
L
I
I
INMAX
LPeak
LPeak
INMAX
INAVE max
INAVE max
BST
BST
PARAMETER
Efficiency
P
T
VLINE
FLINE
OMAX
HOLD
≥
≥
(
(
--------------------------------------------------------------- -
0.4 F
=
----------------------------------------------------- -
0.4 62kHz 3.88
=
=
=
---------------------------------- -
η V
RMSmin.
--------------------------- -
0.92 85V
•
•
2 I •
2 3.88A
)
)
•
TABLE 3. CONVERTER DESIGN PARAMETERS
P
300W
•
=
=
sw
2V
OMAX
RMSmin
INMAX
•
85V
2
----------------------------------------- -
2
------------------------------------- -
Maximum Output Power
•
RMSmin
•
•
VLINE = 115VAC
2
•
2
2
Hold Up Time
BST
•
CONDITIONS
•
=
•
π
•
•
⎛
⎝
π
I
1
INMAX
⎛
⎝
I
3.88A
3.84A
, is given by the following equation:
INMAX
1
+
A
+
ISL6730A, ISL6730B, ISL6730C, ISL6730D
0.4
------- -
•
2
0.4
------- -
2
⎛
⎝
13
⎞
⎠
1
=
•
⎞
⎠
–
=
⎛
⎜
⎝
3.5A
1
----------------------- -
6.5A
–
2 85V
390V
-------------------------------------- -
•
2 V
RMSmin
•
MIN
V
85
47
92
⎞
⎠
OUT
RMSmin
=
617μH
. PF is the power
TYP
115
20
INMAX.
⎞
⎟
⎠
MAX UNIT
265
300
63
(EQ. 10)
(EQ. 14)
(EQ. 11)
(EQ. 12)
(EQ. 13)
(EQ. 8)
(EQ. 9)
(EQ. 7
VAC
ms
Hz
W
%
Select the bridge diode using Equation 15 and sufficient reverse
breakdown voltage. Assuming the forward voltage, V
across each rectifier diode. The power loss of the rectifier bridge
can be calculated:
INPUT CAPACITOR SELECTION
Refer to Table 2 for the recommended input filter capacitor value.
This is the recommended capacitor used after the diode bridge.
For better power factor, less capacitance can be used. To lower
the input filter inductor size, more capacitance can be used.
Two 0.47µF capacitors in parallel are used for C
BOOST DIODE SELECTION
The boost diode loss is determined by the diode forward voltage
drop, V
current is:
The forward power loss on the diode is:
The IDD03E60 part is selected.
The reverse recovery loss on the diode can be calculated. The
Q
I
The reverse recover loss on the diode can be estimated:
The total power loss on the diode is:
MOSFET POWER DISSIPATION
The power dissipation on the MOSFET is from two different types
of losses; the condition loss and the switching loss.
For the MOSFET, the worst case is at minimum line input voltage.
First, the drain to source RMS current is calculated:
I
I
P
P
I
P
P
P
P
I
C
P
F
OUT max
OUT max
DS max
DS max
RR
BR
BR
FD
RRD
RRD
D
FD
IN
= 3.5A.
(
(
=
is found from the diode datasheet. Q
=
(
(
=
=
=
=
P
F
=
=
300W
2 V
2 1V
0.77A 1.85V
I
FD
OUT max
)
)
and the output average current. The maximum output
•
•
1
-- - Q
4
1
-- - 220nC
4
)
)
=
=
+
•
•
=
=
F BR
I
3.88A 1
P
(
INMAX
•
,
P
--------------------
300W
--------------- -
•
390V
•
RR
RRD
V
0.33
---------- -
OMAX
100
3.5A
OUT
)
•
•
•
V
I
=
•
INAVE MAX
V
=
=
OUT
390V
1
=
–
F
(
=
0.99μF
1.42
–
0.77A
8 2
---------- -
7W
3π
1.42W
8 2
---------- -
3π
•
(
•
F
+
•
sw
62kHz
1.35
•
------------- -
390V
85V
V
------------------------- -
)
RMSmin
V
)W
OUT
=
=
=
3.3A
1.33W
2.75W
RR
= 220nC when
IN
.
February 26, 2013
F,BR
, is 1V
FN8258.0
(EQ. 15)
(EQ. 16)
(EQ. 19)
(EQ. 20)
(EQ. 25)
(EQ. 26)
(EQ. 17)
(EQ. 18)
(EQ. 21)
(EQ. 22)
(EQ. 23)
(EQ. 24)