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FC9920 Datasheet(PDF) 5 Page - First Silicon Co., Ltd

No. de Pieza. FC9920
Descripción  3-Pin Switch-Mode LED Lamp Driver
Descarga  7 Pages
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Fabricante  FS [First Silicon Co., Ltd]
Página de inicio  http://www.firstsilicon.co.kr/
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FC9920 Datasheet(HTML) 5 Page - First Silicon Co., Ltd

   
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FC9920
2012. 10. 31
5/7
Revision No : 0
L1 = (60V · 10.5µs) / (0.3 · 100mA) = 21mH
Select L1 = 22mH, I = 150mA. Typical SRF =
270KHz. Calculate the coil capacitance.
CL = 1/[L1· (2π · SRF)2] = 1 / [22mH · (2π ·
270KHz)2] ≈ 15pF
Step 2. Selecting D1.
Select D1 MUR160 with VR = 600V,
trr ≈ 50ns
and CJ ≈ 8pF (VR>50V).
Step 3. Calculating total parasitic capacitance
using (3).
CP = 5pF + 5pF + 15pF + 8pF = 33pF
Step 4. Calculating the leading edge spike duration
using (4), (5).
TSPIKE = (135V · √2 · 33pF) / 150mA + 50ns ≈
92ns < TBLANK(MIN)=200ns
Step 5. Estimating power dissipation in An9920 at
135VAC using (8) and (10).
Let us assume that the overall efficiency η = 0.7.
Switching Power Loss
PSWITCH = (135V · 33pF + 2 · 150mA · 50ns) ·
(135V – 60V/0.7) / (2 · 10.5µs) ≈ 46mW
Minimum Duty Ratio
DM = 60V / (0.7 · 135V · √2) ≈ 0.45
Conduction Power Loss
PCOND = 0.42 · (100mA)
2· 100Ω + 0.57 · 2
0 0µA ·
135V ≈ 435
mW
Total Power Dissipation in An9920:
PTOTAL = 46mW + 435mW = 481mW
Step 6. Selecting input capacitor CIN
Output Power = 60V · 100mA = 6W
Select CIN = 0.68µF, 250V
1N4007*4
10nF
250V
33nF
250V
0.68µF
250V
CIN
LED1-LED24
CO
L1
LIN
CIN2
AC Line
85-135V
F1
VRD1
CDD
VDD
GND
DRAIN
FC9920
D1
U1
1
3
2
D2
U1
D4
D3
U1
D5
U1
Figure 2. Universal 85 - 135VAC LED Lamp Driver
22mH
150mA
2.2mH
150mA
MUR
160
600V
VF=2.5V
0.1µF
50V


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