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KA7543D Datenblatt(PDF) 9 Page - Fairchild Semiconductor

Teilenummer KA7543D
Bauteilbeschribung  Advanced Feedback Dimming Ballast Control IC
Download  16 Pages
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA7543D Datenblatt(HTML) 9 Page - Fairchild Semiconductor

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KA7543
9
Abnormal Protection
Figure 7. Abnormal Protection Circuit
The abnormal protection is similar to the over current protection, but it is a protection that detects abnormal connection of
lamps. The abnormal protection circuit works when the Vab pin voltage is higher than 2V. The abnormal protection is latched
using a flip-flop and the protection is reset when the ballast system restarts.
Lamp Selector Stage
Figure 8. Lamp Selector Stage
If the Vld pin voltage is between 1V and 3V, it means that there is one lamp connected and if the Vld pin voltage is over 3V, it
is two lamps condition. The feedback reference voltage of the two lamps condition is twice that of one lamp condition.
-
+
Protection reset
2V
3pF
Abnormal protection
30k
+
-
S
Q
R
Q
Vab
7
From no lamp
To output
0.7V
Vct
6
8
+
-
-
+
3V
1V
5pF
Selecter
No-lamp pretection
5k
Vr
ir
is-id
Gm
+
-
1/2
Vfb
Vld
Cc
30k


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