B) capacitors c) other components, A) resistors – Rainbow Electronics MAX1611 User Manual
Page 10
MAX1610/MAX1611
Digitally Controlled CCFL Backlight
Power Supplies
10
______________________________________________________________________________________
TOLER-
ANCE
WORKING
VOLTAGE
C1
±20%
±25V
C2
±10%
±3kV
SYMBOL
C3, C5
±20%
25V
C4, C6,
C7, C8
-20%
25V
C9
-50%
35V
0.1
µ
F
(Note 1)
(pF)
VALUE
27nF
0.1
µ
F
10
µ
F
b) Capacitors
c) Other Components
NOTES
δ
F
≤
0.001 @ 1kHz
High voltage
Ceramic, larger
values acceptable
Tantalum, low ESR
GENERIC
PART
SURFACE-MOUNT
PART
Q1, Q2
2N2222A
FMMT619, SOT23
D1, D3
1N4148
CMPD4448, SOT23
SYMBOL
D2
1N5818
EC10QS04
L1
CDR125-101
MANUFACTURER
Zetex
Central
T1
CTX110605
Nihon
Sumida
Coiltronics
1A NPN switching transistor,
V
CEO
≥
50V
50mA silicon diode, V
BR
≥
40V
DESCRIPTION
1A Schottky diode, V
BR
≥
30V
100µH, 1A inductor
6W Royer oscillator transformer, turns ratio 67:1,
secondary (pins 10 and 6) : primary (pins 1 and 3),
primary magnetizing inductance (L
P
) of 44µH ±20%
Note:
Component values depend on lamp characteristics. See Table 3 to select values.
Note:
f
ROY
= Royer oscillator damped resonant oscillation frequency. T1 primary magnetizing inductance (L
P
) = 44µH ±20%.
VCT = average voltage from the T1 center tap to the emitters of Q1 and Q2 (ignoring Q1, Q2 V
CE,SAT
).
C1 = 0.1µF ± 20%; C2 = ±10% tolerance; R1 = ±1% tolerance.
Table 3. Selecting Circuit Values for Figure 4
Table 2. Typical Application Circuit Component Values
TOLERANCE
POWER
RATING
R1
±1%
1/8W
R2
±10%
1/8W
R3
±5%
1/16W
R4
±5%
1/16W
R7
±10%
1/16W
R6
±5%
1/16W
R5
±5%
1/16W
(Note)
510
Ω
VALUE
51k
Ω
8.2k
Ω
20
Ω
51k
Ω
150k
Ω
SYMBOL
600
5
53.6
63.1
78.1
0.698
Ω
8.41V
15pF
MIN
TYP
MAX
VCT
(V
MAX
)
7.29V
7.17V
6.55V
4.14V
3.63V
3.61V
4.30V
C2
18pF
18pF
20pF
36pF
22pF
43pF
18pF
I
L
(mA
RMS
)
f
ROY
(kHz)
550
5
52.5
61.8
76.7
500
5
52.1
61.0
75.1
450
5
51.1
59.7
73.3
300
5
45.6
52.8
64.7
250
250
3
50.3
58.6
71.8
5
43.3
49.7
60.3
300
3
52.1
61.0
75.1
R1
0.665
Ω
0.715
Ω
0.732
Ω
0.681
Ω
1.21
Ω
0.715
Ω
1.18
Ω
V
L
(V
RMS
)
a) Resistors