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KB4317 Datasheet(PDF) 1 Page - Kingbor Technology Co |
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KB4317 Datasheet(HTML) 1 Page - Kingbor Technology Co |
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1 / 9 page  High Efficiency, Constant Current 2 Watt Boost White-LED Driver •Operating Voltage:2.3V~6.5V •High Operating Frequency: 1.2MHz •High Output Voltage: Up to 32V •Shutdown Current <1 A •30V Output Over-voltage protection (min) •Digital Dimming Control. •Built-in Cycle-by Cycle Current-limiting. •Built-in Soft-Start Function. •0.25V Low Reference Voltage(+/-5%) •Tiny SOT23-6 Package • LED Module • LED Backlight for LCD Display Vcc>3.6V(7 ~8 ) • Constant Current Source The KB4317 step-up converter drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. It features allowing series connection of the white LEDs so that the LED currents are identical for uniform brightness. An enable input can be pulsed repeatedly to adjust LED’s brightness. The fast 1.2 MHz current-mode PWM control allows for smaller capacitor and inductor. Fault condition protection uses cycle-by-cycle current limiting to sense maximum inductor current, thermal protection and over-voltage protection. Also included soft-start eliminates inrush current during start-up. The 0.25V low reference voltage minimized the power loss across the current-setting resistor. The KB4317 is available in SOT23-6 packages LX VREF(250mV) + - FB ON/OFF Control Logic / PWM Dimming Control GND Control Logic EN VREF 0.25V N VBG 1.23V VIN + - VBG OVP + - Overvoltage Protection Current Limit 0.75A CTL CTL 22V(300uA) Soft-Start 1 KB4317 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 •High Efficiency: Up to 90% •High Output Power: 2W APPLICATIONS FEATURES DESCRIPTION SIMPLIFIED BLOC DIAGRAM ” ” REV: 1.0 |
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