TP3984裕鼎祥咨询电话：139 2843 4054
用在双节上可以驱动3串9并，单节只能到3串7并
DESCRIPTION
The TP3984 is a constant current step-up converter specifically designed to drive white LEDs. The Step-up converter topology allows series connection of the white LEDs so the LED currents are identical for uniform brightness. The TP3984 switches at 1.1MHz, allowing the use of tiny external components. The input and output capacitor can be as small as 1µF, saving space and cost versus alternative solutions. A low 0.25V feedback voltage minimizes power loss in the current setting resistor for better efficiency. TP3984 is enhanced with Soft-Start function and that could significantly reduce noise induced by capacitor.
The TP3984 is available in low profile SOT23-6 package.
FEATURES
·2.6V to 5.5V Input Range
·27V Output with Over Voltage Protection
·High Efficiency :85 % Typical
·Internal Soft-Start
·PWM Dimming Control
·Internal High Power 30V MOSFET Switch
·Fast 1.1MHz Switching Frequency
·Small, Low-Profile Inductors and Capacitors
·SOT23-6 Package
·RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
·Mobile Phone
·Digital Still Camera
·PDAs, Handheld Computers
·MP3 Players
·GPS Receivers
