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FC9922 데이터시트(Datasheet) 6 Page - First Silicon Co., Ltd

부품명 FC9922
상세내용  3-Pin Switch-Mode LED Lamp Driver IC
PDF  8 Pages
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제조사  FS [First Silicon Co., Ltd]
홈페이지  http://www.firstsilicon.co.kr/
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FC9922
2012. 10. 31
6/8
Revision No : 0
Step 1. Calculating L1.
The output voltage V
O = 12 x VF = 30V (max.). Use equation
(1) assuming a 30% peak-to-peak ripple.
L1 = (30V • 10.5µs) / (0.3 • 50mA) = 21mH
Select L1 22mH, I = 60mA. Typical SRF = 270KHz. Calculate
the coil capacitance.
C
L =
1
L1 • (2π • SRF)2
=
1
22mH
• (2π • 270kHz)2
≈ 15pF
Step 2. Selecting D1
Select D1 MUR160 with V
R = 600V, trr ≈ 50ns and CJ ≈ 8pF
(V
F > 50V).
Step 3. Calculating total parasitic capacitance using (3)
C
P = 5pF + 5pF + 15pF + 8pF = 33pf
Step 4. Calculating the leading edge spike duration using
(4), (5)
T
SPIKE =
135V • √2 • 33pF
+ 50ns
100mA
≈ 113ns < T
BLANK(MIN)
Step 5. Estimating power dissipation in FC9922 at 135VAC
using (8) and (10)
Switching power loss:
P
SWITCH =
1
(135V • 33pF + 2 • 100mA• 20ns)(135V - 30V)
2 • 10.5µs
0.7
P
SWITCH ≈ 65mW
Minimum duty ratio:
D
M = 30V / (0.7 • 135V • √2) ≈ 0.23
Conduction power loss:
P
COND = 32 • (50mA)
2
• 200Ω + 0.62 • 200µA • 135V
P
COND ≈ 175mW
Total power dissipation in FC9922:
P
TOTAL = 65mW + 175mW = 240mW
Step 6. Selecting input capacitor C
N
Output Power = 30V • 50mA = 1.5W
Select C
N 0.22µF, 250V.
Figure 2. Universal 85-265VAC LED Lamp Driver
C
IN
AC Line
85-265V
C
DD
3
FC9922
D1
L1
LED
1 - LED12
D2
U1
D3
D4
D5
C
IN2
L
IN
VRD1
F1
C
O
VDD
DRAIN
GND
1
2




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