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KB4312 Datasheet(PDF) 1 Page - Kingbor Technology Co |
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KB4312 Datasheet(HTML) 1 Page - Kingbor Technology Co |
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1 / 9 page  •Operating Voltage:2.5V~6.5V •High Operating Frequency: 1.2MHz •High Output Voltage: Up to 28V(max) •Shutdown Current <1 A •18V Output Over-voltage protection (ADJ) •Digital Dimming Control. •Built-in Cycle-by Cycle Current-limiting. •Built-in Soft-Start Function. •0.24V Low Reference Voltage(+/-5%) •Tiny SOT23 Package • LED Module • LED Backlight for LCD Display (1 ~6.5 ) • Constant Current Source The KB4312 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 0.24V low reference voltage minimized the power loss across the current-setting resistor. The KB4312 is available in SOT23 packages LX + - FB ON/OFF Control Logic / PWM Dimming Control GND Control Logic EN VREF 0.240V N VBG 1.27V VIN + - VBG OVP + - Overvoltage Protection Current Limit 0.25A CTL CTL 17V Soft-Start 1 KB4312 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 •High Efficiency: Up to 92% APPLICATIONS FEATURES DESCRIPTION SIMPLIFIED BLOC DIAGRAM ” ” REV: 3.2 1 2 3 4 6 5 Very Low Cost KB4312B FB=240mV KB4312A FB=1.27V Tiny Package, High Performance, Constant Current Switching Regulator for White LED |
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