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Application Hints
C
performs an integration of the parabolic signal on C
S
by the combination of C
4.3
Application with Differential-output Drivers
Certain driver ICs provide the ramp signal in differential form, as two current sources i
opposite variations.
470μF
Differential output
driver IC
i
p
i
cm
-i
p
i
cm
(*) recommended:
Let us set some definitions:
i
is the common-mode current:
●
cm
at peak of signal, i
●
i
) = 2 i
, and the peak-peak differential signal, 4i
p
p
The application is described in
that V
remains equal to V
1
8/14
STMicroelectronics Confidential
and C
.
L
s
Figure 7: Using a Differential-output Driver
0.1μF
Power
Amplifier
+
7
+
R
7
-
1
-
-V
EE
470μF
Ly
------------- -
<
Rd
<
50ms
= i
+ i
and i
+
cm
p
Figure 7
.
7
, therefore the amount of S correction is set
L
C
(47 to 100μF)
F
6
3
2
Thermal
Safety
4
0.1μF
Ly
------------- -
20ms
1
(
)
i cm
=
-- - i +
+
i -
2
= i
- i
, therefore the peak differential signal is i
-
cm
p
.
p
with DC yoke coupling. The calculations still rely on the fact
+Vs
Output
Voltage
Output
Flyback
Current
Generator
5
1.5W
R
2
STV8172A
and i
with
-
+
I
p
Yoke
Rd(*)
Ly
R
1
- (-
p
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