KA7540 데이터 시트보기 (PDF) - Fairchild Semiconductor
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KA7540 Datasheet PDF : 14 Pages
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KA7540
Internal Block Diagram
CS
6.8µF
1
25µA
VZ
−
+
17µA IS
Vref
VZ
2V Ref
Internal
bias
UVLO
1.8V +
UVLO
−
12.5V
Ct
180pF
Oscillator
Ict
+
IC
2
latch + +
Q
8Ict
F.D
Vdim 3
VCC Id
80kΩ 100µA
Vd
3pF
20kΩ
from VCS
+
−
kVref
Ldet 4
40kΩ
VZ
25µA
−
5pF
+
Shut down signal
2V
Frequency
divider
IS = 17µA × (Vref − VSS) / Vref
Id = 25µA × (Vref − Vd) / Vref
8 VCC
7 OUT 1
6 OUT 2
5 GND
IC Characteristics
Parameter
Initial soft start frequency
Voltage controlled dimming
KA7540
1.33 × normal operating frequency
1 ~ 10V
2
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