ZXSC310(2001) データシートの表示（PDF） - Zetex => Diodes

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ZXSC310
(Rev.:2001)

LED DRIVER SOLUTION FOR LCD BACKLIGHTING

Zetex => Diodes 

ZXSC310

Output Power Calculation

By making the above assumptions for inductance and

peak current the output power can be determined by:

TOFF

POUT = (VOUT − VIN) × IAV × TON + TOFF

Note:VOUT=output voltage + Schottky rectifier voltage

drop.

Where

Capacitor selection

For pulsed operation, as in the maximum battery life

solution, no capacitors are required at the output to the

LED. For rectified operation, as in the maximum

brightness solution, a small value ceramic capacitor is

required, typically 2.2uF.

Generally an input capacitor is not required, but a small

ceramic capacitor may be added to aid EMC, typically

470nF to 1uF.

(notes)

TOFF ≅1.7us (internally set by ZXSC310)

and

TOFF(VOUT − VIN)

TON =

VIN

and

IPK + IMIN

IAV = 2

Where

(VOUT − VIN) × TOFF

IMIN = IPK −

L

Operating frequency can be derived by:

1

F = (TON + TOFF)

PROVISIONAL ISSUE A - SEPTEMBER 2001

11

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