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ZHCS500 Datasheet(PDF) 5 Page - Zetex Semiconductors |
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ZHCS500 Datasheet(HTML) 5 Page - Zetex Semiconductors |
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5 / 14 page  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 PROVISIONAL ISSUE A - SEPTEMBER 2001 5 I 2 Drive ISENSE R2 VRE R1 VDRIVE GND I VCC STDN ZXSC310 Block Diagram |
Similar Part No. - ZHCS500 |
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Similar Description - ZHCS500 |
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