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KA7540 датащи(PDF) 7 Page - Samsung semiconductor

номер детали KA7540
подробное описание детали  Simple Dimming Ballast Control IC
Download  14 Pages
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производитель  SAMSUNG [Samsung semiconductor]
домашняя страница  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

KA7540 датащи(HTML) 7 Page - Samsung semiconductor

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KA7540
KA7540
KA7540
KA7540
7
7
7
7
Figure 2. Oscillator sawtooth & Output gate drive waveform
Figure 2. Oscillator sawtooth & Output gate drive waveform
Figure 2. Oscillator sawtooth & Output gate drive waveform
Figure 2. Oscillator sawtooth & Output gate drive waveform
As a result, the switching frequency is as following
Ts = 2
× (∆Tch + ∆Tdis) = 40µs
fsw = 1 / TS = 25kHz
The explicit equation calculating the value of the timing capacitor for a certain switching frequency is written below.
Soft Start
Soft Start
Soft Start
Soft Start
The switching frequency is decreasing linearly from the pre-heating frequency to the normal switching frequency. In KA7540,
the normal timing capacitor charging current is increased by 25
µA during the pre-heating mode. This addition of the charging
current sets the pre-heating frequency to be 1.33 times the switching frequency at the normal mode.
Figure 3. Frequency & Soft start capacitor voltage variation during soft start and dimming mode
Figure 3. Frequency & Soft start capacitor voltage variation during soft start and dimming mode
Figure 3. Frequency & Soft start capacitor voltage variation during soft start and dimming mode
Figure 3. Frequency & Soft start capacitor voltage variation during soft start and dimming mode
Vct
(Pin #2)
Voutput
(Pin #6, 7)
Charging
Period(
∆Tch)
Discharging
Period(
∆Tdis)
Vhigh
Vlow
14V
0V
Ct
11.76
10
6
×
fsw
---------------------------------
=
fsw, VCS
fsw (pre)
fsw (dim)
fsw (nor)
3.5V
2.7V
2V
0.95
ts/s
td1
td2


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