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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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CM9311 Datenblatt(PDF) 1 Page - California Micro Devices Corp |
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CM9311 Datenblatt(HTML) 1 Page - California Micro Devices Corp |
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1 / 10 page  © 2006 California Micro Devices Corp. All rights reserved. 04/26/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 1 CM9311 PRELIMINARY Features • Integrated WLED and OLED driver • 2.7V to 6V input voltage range • Up to 85% typical efficiency even for differenent channel loads in terms of LED number, LED cur- rent and LED dropout • Excellent 5 series x 1 parallel WLED drive capabil- ity (35 mA per channel) • OLED channel with up to 18V/30 mA capability • Independent current/voltage setting using external low power resistors for each channel (no ballast resistors) • No external frequency compensation needed • Low (<1%) LED output ripple voltage and current • Input undervoltage lockout and output over voltage protection • 1 MHz fixed switching frequency (0.5 MHz option available) • Uses small inductor and ceramic capacitors • Integrated 0.3 Ω internal power switch • Disconnects LEDs during shutdown • Low Profile TDFN-10 package • Optional RoHS compliant lead free package Applications • Drives white LED backlighting and OLED • Cellar phones • Digital Cameras • PDA, GPS, MP3 players • Handheld devices Product Description The CM9311 is a high frequency, two-channel induc- tor-based PWM boost regulator specifically designed for constant current white LED and constant voltage OLED drive applications. With a maximum 19V/100mA output capability, the circuit can drive up to 5 WLEDs (5 series x 1 parallel) and one OLED, allowing up to 35mA per channel. With an input voltage range from 2.7V to 6.0V, it can operate from a single cell Li-Ion battery. The proprietary FlexBoost ™ architecture (patent pend- ing) provides high efficiency (typical 85%) for a wide input voltage range, even for different channel loads in term of LED number, LED current and LED type. The maximum LED current and OLED voltage for each channel is independently programmed with external low-power resistors (no ballast resistors needed). A 1 MHz constant frequency PWM saves board space, allowing small, low-cost external components, and per- mitting designers to avoid sensitive IF bands in RF applications. The output over-voltage protection circuit prevents damage in the case of a high impedance out- put (e.g. faulty LED). The controlled current limit circuit prevents large inductor current spikes, even at start- up. To avoid possible leakage currents, the EN control pin disconnects the LEDs from ground during shut- down. The CM9311 is available in a compact TDFN-10 pack- age. It can operate over the industrial temperature range of -40°C to 85°C. 2.7V to 6.0V 22K V IN 1 91K 3 5 4 6 7 8 2 L1 D1 1 uF/16V 4.7 uH 1A/20V 10 uF/10V V OUT C OUT 10 9 20K R SET 1 R SET 22 R SET 21 Enable on (by default) OLED CM9311 ISET1 GND VSET2 VOUT SW LED2 VIN LED1 EN off VREF C IN Channel CH1 CH2 10 uF/16V C OLED PhotonICTM Typical Application Asymmetrical High Efficiency Two Channel Boost LED/OLED Driver |
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Ähnliche Beschreibung - CM9311 |
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