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ZXSC310 Fiches technique(PDF) 5 Page - Zetex Semiconductors

No de pièce ZXSC310
Description  LED DRIVER SOLUTION FOR LCD BACKLIGHTING
Download  16 Pages
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Fabricant  ZETEX [Zetex Semiconductors]
Site Internet  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

ZXSC310 Fiches technique(HTML) 5 Page - Zetex Semiconductors

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DEVICE DESCRIPTION
The ZXSC310 is PFM, controller IC which, when
combined with a high performance external transistor,
enables the production of a high efficiency boost
converter for LED driving applications. A block
diagram is shown for the ZXSC310 below.
The on chip comparator forces the driver circuit and
therefore the external switching transistor off if the
voltage at ISENSE exceeds 19mV. An internal reference
circuit and divider set this threshold.
The voltage at ISENSE is taken from a current sense
resistor connected in series with the emitter of the
switching transistor. A monostable following the
output of the comparator forces the turn-off time of the
output stage to be typically 1.7us. This ensures that
there is sufficient time to discharge the inductor coil
before the next on period.
With every on pulse the switching transistor is kept on
until the voltage across the current-sense resistor
exceeds the threshold of the ISENSE input. The on-pulse
length, and therefore the switching frequency, is
determined by the programmed peak current, the input
voltage and the input to output voltage differential. See
applications section for details.
The driver circuit supplies the external switching
transistor with a fixed drive current. To maximise
efficiency the external transistor switched quickly,
typically being forced off within 30ns.
ZXSC310
ISSUE 2 - MARCH 2004
5
SEMICO NDUC TORS
Drive
R2
V
R1
I
ZXSC310 Block Diagram


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