Datasheet

NCL30100
http://onsemi.com
23
Figure 48. Design Example Schematic of 115 Vac Converter
C2
47n
R3
150k
CS
GND
CT
DRV
VCC
IVC
R5
R33
C4
C5
1u
R2
R1
24k
Q1
D2
L2
IC1
NCL30100
D5
1N4148
R4
5.6k
D1
MRA4003
D3
MRA4003
D6
MRA4003
D4
MRA4003
Q2
R7
10k
R6
5.6k
DIMM
0/5 V
A
K
Vac
Vac
CX1
C1
L1
C3
2.2n
100u
2.2u
BC817−16L
560p10p
24k
MURA130
1mH
MTD6N20ET
GND
D7
16V
The input voltage in range 85−140 Vac is rectified by
bridge rectifier D1, D3, D4 and D6. To limit current peaks
generated during on time period, capacitor C1 is used. CX1,
C2 and L1 are an EMI filter to protect mains against current
spikes mainly generated by D2 if Q1 is turned on. The
NCL30100 is powered through resistors R1 and R2. The
Vcc voltage is limited by D7. Maximum LED current is set
by resistors R3, R4 and R5. In this case Rsense is 0.33 W to
reach higher accuracy. A small capacitor C3 is used to filter
out spikes which are generated during the turn off of diode
D2. It is recommended to use L2 with low series resistance
since current is flowing through the inductor continuously
and D2 should be selected for low forward voltage drop and
fast reverse recovery time.
Figure 49. Component Side Figure 50. Single Layer PCB
Design for this Application