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AN2782 Datasheet(PDF) 19 Page - STMicroelectronics

Part # AN2782
Description  Solution for designing a 400 W fixed-off-time controlled
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2782 Datasheet(HTML) 19 Page - STMicroelectronics

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AN2782
Designing a fixed off-time PFC
Doc ID 14763 Rev 2
19/39
From (20) and (50) the maximum thermal resistance to keep the junction temperature below
125 °C is then:
The diode is attached to the same heat sink as the power MOSFET. The STTH8R06 has an
isolated package and can be attached directly to the heat sink. Silicone thermal grease may
be applied to improve the thermal contact between the diode and heat sink.
4.3.7
L6562A biasing circuitry
Following the dimensioning of the power components, the biasing circuitry for the L6562A is
also described. For reference, the internal schematic of the L6562A is represented below in
Figure 11
. For more details on the internal functions, please refer to the datasheet.
Figure 11.
L6562A internal schematic
●
Pin 1 (INV): This pin is connected both to the inverting input of the E/A and to the OVP
circuitry. A resistive divider is connected between the boost regulated output voltage
and this pin. The internal reference on the non-inverting input of the E/A is 2.5 V (typ),
while the OVP intervention threshold is 27 µA (typ). RoutH and RoutL are then selected
as follows:
(51)
diode
ambx
th
P
T
C
125
R
−
°
=
W
C
45
.
44
W
68
.
1
C
50
C
125
R
th
°
=
°
−
°
=
(52)
(53)
VREF2
OVERVOLTAGE
DETECTION
VOLTAGE
REGULATOR
UVLO
INTERNAL
SUPPLY BUS
+
-
= 2.5V
-
+
+
-
STARTER
+
-
ZERO CURRENT
DETECTOR
1.4 V
0.7 V
VCC
8
12
3
4
ZCD
VCC
INV
COMP
MULT
CS
GD
7
5
GND
6
25 V
Starter
stop
LEADING-EDGE
BLANKING
DIS
LOWER & UPPER
CLAMPS
DIS
-
+
0.45 V
0.2 V
DYN
OVP
STAT
OVP
MULTIPLIER AND
THD OPTIMIZER
R
S
Q
DRIVER
& CLAMP
ERROR
AMPLIFIER
PWM
COMPARATOR
1 V
VREF
1
V
5
.
2
V
R
R
out
outL
outH
−
=
159
1
V
5
.
2
V
400
R
R
outL
outH
=
−
=
A
27
V
R
OVP
outH
μ
Δ
=
Ω
=
μ
=
M
481
.
1
A
27
V
40
R
outH



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