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ML4818 Fiches technique(PDF) 10 Page - Fairchild Semiconductor

No de pièce ML4818
Description  Phase Modulation/Soft Switching Controller
Download  13 Pages
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ML4818 Fiches technique(HTML) 10 Page - Fairchild Semiconductor

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ML4818
PRODUCT SPECIFICATION
10
REV. 1.0.3 6/21/01
Thermal Information
The ML4818 is offered in a Power DIP package. This pack-
age features improved thermal conduction through the lead-
frame. Much of the heat is conducted through the center 4
grounded leads. Thermal dissipation can be improved with
this package by using copper area on the board to function as
a heat sink. Increasing this area can reduce the
θ
JA (see fig-
ures 14 and 15), increasing the power handling capability of
the package. Additional improvement may be obtained by
using an external heat sink (available from Staver).
Applications
The application circuit shown in Figure 16 features the
ML4818 in a primary-side controlled voltage mode
application with voltage feed-forward. Input voltage is
rectified 120VAC (nominal). Feed-forward is provided by
the RAMP pin via the resistor connected to the high voltage
input. Current is sensed through sense transformer T4.
Figure 14. PC Board Copper Area Used as a Heat Sink
Figure 15.
θ
JA as a Function of I (see figure 15)
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
0.555"
I
I
I
I
50
30
20
02
I : HEAT SINK DIMENSION (INCHES)
40
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8


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