Rainbow-electronics MAX1611 Bedienungsanleitung PDF herunterladen (Seite 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

0.1µF

(Note 1)

(pF)

VALUE

27nF

0.1µF

10µF

b) Capacitors

c) Other Components

NOTES

δF ≤ 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,

CEO

≥ 50V

50mA silicon diode, V

≥ 40V

DESCRIPTION

1A Schottky diode, V

≥ 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

) 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

) = 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)

510Ω

VALUE

51kΩ

8.2kΩ

20Ω

51kΩ

150kΩ

SYMBOL

600 5 53.6 63.1 78.1

0.698Ω

8.41V15pF

MIN TYP MAX

VCT

MAX

)

7.29V

7.17V

6.55V

4.14V

3.63V

3.61V

4.30V

18pF

20pF

36pF

22pF

43pF

18pF

(mA

RMS

)

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

0.665Ω

0.715Ω

0.732Ω

0.681Ω

1.21Ω

0.715Ω

1.18Ω

RMS

)

a) Resistors

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

MAX1610/MAX1611 1
Power Supplies 1

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