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BL8305A Datasheet(PDF) 5 Page - SHANGHAI BELLING CO., LTD.

Part # BL8305A
Description  BALLAST CONTROL IC
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Manufacturer  BELLING [SHANGHAI BELLING CO., LTD.]
Direct Link  http://www.belling.com.cn
Logo BELLING - SHANGHAI BELLING CO., LTD.

BL8305A Datasheet(HTML) 5 Page - SHANGHAI BELLING CO., LTD.

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BL8305A
BL8305A
BL8305A
BL8305A BALLAST CONTROL IC
BALLAST CONTROL IC
BALLAST CONTROL IC
BALLAST CONTROL IC
http://www.belling.com.cn
- 5 -
8/28/2006
Total 8 Pages
2
1
2
7
*
249
.
0
10
203
.
0
p
p
p
p
preheat
R
R
R
C
T
+
×
×
=
sec。Preheat frequency is set by the
voltage(VRpre)
at
pin3,
the
preheat
frequency
is:
run
Rpre
pre
f
V
f
×
=
6
.
1
35
.
6
2
1
2
Pr
×
+
=
pre
pre
pre
e
R
R
R
R
V
. The run mode oscillating frequency is determined by the
timing resistor RT and timing capacitor Ct,
t
t
run
C
R
f
×
=
374
.
0
Drive BHF or MHF
Drive BHF or MHF
Drive BHF or MHF
Drive BHF or MHF
When driving BHF, a transformer with two secondary magnifies the output current
of BL8305A and the half-bridge is drive by the magnified current. The output voltage
of half-bridge is divided by the resistor RHV and an internal resistor about 40Kohm
in the PIN HV and the BL8305A senses this waveform, and automatically adjusts the
BCI. The BCI Auto-Adj is enabled at about 1 sec after the ignition. As showing in
the figure, if BCI is appropriate, the output of BL8305A will be remain as the black
line; if BCI is low, the output of BL8305A will be increase as the dashed line;
if BCI is over driving, the output of BL8305A will be decrease as the dashdotted
line.


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