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FC9921 Datasheet(Arkusz danych) 6 Page - First Silicon Co., Ltd

Numer części FC9921
Szczegółowy opis  3-Pin Switch-Mode LED Lamp Driver IC
Pobierz  8 Pages
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Producent  FS [First Silicon Co., Ltd]
Strona internetowa  http://www.firstsilicon.co.kr/
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FC9921
2012. 10. 31
6/8
Revision No : 0
Step 1. Calculating L1.
The output voltage V
O = 10 x VF ≈ 41V (max.). Use equation
(1) assuming a 30% peak-to-peak ripple.
L1 = (41V • 10.5µs) / (0.3 • 20mA) = 72mH
Select L1 68mH, I = 30mA. Typical SRF = 170KHz. Calculate
the coil capacitance.
C
L =
1
L1 • (2π • SRF)2
=
1
68mH
• (2π • 170kHz)2
≈ 13pF
Step 2. Selecting D1
Usually, the reverse recovery characteristics of ultra-
F = 20 ~ 50mA are not provided in the
manufacturer’s data books. The designer may want to
experiment with different diodes to achieve the best result.
Select D1 MUR160 with V
R = 600V, trr ≈ 20ns (IF = 20mA, IRR
= 100mA) and C
J ≈ 8pF (VF > 50V).
Step 3. Calculating total parasitic capacitance using (3)
C
P = 5pF + 5pF + 13pF + 8pF = 31pf
Step 4. Calculating the leading edge spike duration using
(4), (5)
T
SPIKE =
265V • √2 • 31pF
+ 20ns
100mA
≈ 136ns < T
BLANK(MIN)
Step 5. Estimating power dissipation in FC9921 at 265VAC
using (8) and (10)
Switching power loss:
P
SWITCH =
1
(265V • 31pF + 2 • 100mA• 20ns)(265V - 41V)
2 • 10.5µs
0.7
P
SWITCH ≈ 65mW
Minimum duty ratio:
D
M = 41V / (0.7 • 265V • √2) ≈ 0.16
Conduction power loss:
P
COND = 0.25 • (20mA)
2
• 210Ω + 0.63 • 200µA• 265V
P
COND ≈ 55mW
Total power dissipation in FC9921:
P
TOTAL = 120mW + 55mW = 175mW
Step 6. Selecting input capacitor C
N
Output Power = 41V • 20mA = 820mW
Select C
IN ECQ-E4104KF by Panasonic (0.1µF, 400V,
Metalized Polyester Film).
Figure 2. Universal 85-265VAC LED Lamp Driver
C
IN
AC Line
85-265V
C
DD
3
FC9921
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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