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