Constant Current 2 Watt Boost White-LED Driver
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4317
High Efficiency, Constant Current 2 Watt...
Description
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4317
High Efficiency, Constant Current 2 Watt Boost White-LED Driver
FEATURES
Operating Voltage:2.3V~6.5V High Operating Frequency: 1.2MHz High Efficiency: Up to 90% High Output Voltage: Up to 32V High Output Power: 2W Shutdown Current <1PA 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
DESCRIPTION
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.
APPLICATIONS
The KB4317 is available in SOT23-6 packages/
LED Module LED Backlight for LCD Display Vcc>3.6V(7 ”~8 ”) Constant Current Source!
SIMPLIFIED BLOC DIAGRAM
VIN
EN
FB OVP
ON/OFF Control Logic / PWM Dimming Control
CTL...
Similar Datasheet