PR4401 datasheet(3/12 Pages) ETC1

部品番号	PR4401

部品情報	0.9V Boost Driver for White LEDs PR4401/4402 Requires Only One External Component

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LED DRIVER PR4401/PR4402

Typical Characteristics

Test circuit

Measurement and Calculation of Efficiency

Efficiency %=

T ∫

 V LED⋅I LED dt

T ∫

V in⋅Iin dt

⋅

100

Depending on test setup and measuring method, efficiency values can vary by approx. ±5%, and peak

current values can vary by up to ±20%, Accuracy of mean currents: ±1mA.

Measuring conditions for all diagrams, unless otherwise noted:

●

Ta = 25°C

●

one LED connected (peak voltage 4.2...5.8V)

A LQH32C from Murata has been used as reference inductor, the DC resistance is specified as 0.44

Ω ±

30% for 10 µH (max current 300 mA), 0.71

Ω ± 30% for 22 µH (max. current 250 mA) and 1.30 Ω ± 30% for a

47 µH inductor (max. current 170 mA).

Oscilloscope Displays

PR4401; LED voltage (CH1) and LED current (CH2, over 0.5 Ohm resistor)

with L1 = 22 µH

L1 = 10 µH

Page 3/12

Rev 0908

Vcc

Gnd

Vout

PR4401

0.5

Ω

or 1

Ω

470nF

0.5

Ω

or 1

Ω

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