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KA7541D Fiches technique(PDF) 6 Page - Fairchild Semiconductor

No de pièce KA7541D
Description  Simple Ballast Controller
Download  14 Pages
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA7541D Fiches technique(HTML) 6 Page - Fairchild Semiconductor

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KA7541
6
Figure 2. Oscillator sawtooth & Output gate drive waveform
As a result, the switching frequency is as following
Ts = 2
× (∆Tch + ∆Tdis) = 15.29µ
fsw = 1 / TS = 65KHz
The explicit equation calculating the size of the timing capacitor for a certain switching frequency is written below.
Soft Start
The switching frequency is linearly decreasing from the pre-heating frequency to the normal switching frequency.
In KA7541, the initial pre-heating frequency can be adjusted depending on the types of the lamps used. During the pre-heating
mode, a sixth of the soft start current (IS) which flows through the soft start resistor (RS) at pin #3 is added to the normal
timing capacitor charging current (50
µA). The rising and falling slope of the triangular waveform are increased due to this
added current.
Soft start current (IS) = 2V / RS
Rising slope: dv / dt = i / C = (50
µA + IS / 6) / Ct
Falling slope: dv / dt = i / C = 7
× (50µA + IS / 6) / Ct
So, once the value of RS and Ct are known, the pre-heating frequency can be calculated straightforward by using the
following equation.
The dead time ratio during pre-heating mode is maintained to be constant as well as in normal mode.
(on duty: dead time = 7:1 )
The voltage of the soft start capacitor (CS) determines the soft start time (tss). When VCC voltage exceeds the start-up voltage
(Vth(st)), the soft start capacitor start to be charged by the current source (313nA). The switching frequency decreases linearly
to fsw(nor) from fsw(pre) until the soft start capacitor voltage (VCS) touches 2V. Therefore the soft start duration time (tss)
can be acquired by the following formula.
Vct
(Pin #2)
Voutput
(Pin #6, 7)
Charging
Period(
∆Tch)
Discharging
Period(
∆Tdis)
2.86V
1.0V
14V
0V
C
t
11.76
10
6
×
f
sw
---------------------------------
=
fsw pre
()
50
10
6
0.33
Rs
-----------
+
×
Ct
4.25
×
-------------------------------------------
=


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