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SC411 Fiches technique(PDF) 16 Page - Semtech Corporation

No de pièce SC411
Description  Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
PDF  27 Pages
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Fabricant  SEMTECH [Semtech Corporation]
Site Internet  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC411 Fiches technique(HTML) 16 Page - Semtech Corporation

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© 2007 Semtech Corp.
www.semtech.com
SC411
POWER MANAGEMENT
Application Information (Cont.)
I
VDDP
= gate drive operating current (A)
V
g
= gate drive voltage, typically 5V (V)
Q
g
= FET gate charge, from the FET datasheet (C)
f
= switching frequency (kHz)
VBST = boost pin voltage during t
ON (V)
D
= duty cycle
Inserting the following values for VBAT
(MIN) condition (since
this is the worst case condition for power dissipation in
the controller) as an example (VOUT = 1.2V),
T
A
= 85°C
θ
JA
= 100°C/W
VCCA
= VDDP = 5V
I
VCCA
= 1100μA (data sheet maximum)
I
VDDP
= 150μA (data sheet maximum)
V
g
= 5V
Q
g
= 60nC
f
= 266kHz
VBAT
(MIN) = 8V
VBST
(MIN) = VBAT(MIN)+VDDP = 13V
D
(MIN)
= 1.2/8 = 0.15
gives us,
W
088
.
0
15
.
0
10
1
13
10
266
10
60
5
10
150
5
10
1100
5
P
3
3
9
6
6
D
=
•
•
•
+
•
•
•
•
+
•
•
+
•
•
=
−
−
−
−
and,
C
8
.
93
100
088
.
0
85
T
J
°
=
•
+
=
As can be seen, the heating effects due to internal power
dissipation are practically negligible, thus requiring no
special thermal consideration during layout.
The Reference Design is shown in Figure on Page 17.
An additional design optimized for efficiency and capable
of a higher load current of 10A is shown in Figure 11 on
Page 21.



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