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裕鼎祥科技让电源设计更便捷可靠|联系电话：13928434054 |
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裕鼎祥科技让电源设计更便捷可靠|联系电话：13928434054 |
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TP3990概述：可单串10颗LED串联背光驱动IC 10颗LED串联背光驱动IC 10颗LED串联背光驱动IC 10颗LED驱动
The TP3990 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 TP3990 switches at 1MHz, allowing the use of tiny external components. The output capacitor can be as small as 0.22µF, saving space and cost versus alternative solutions. A low 0.3V feedback voltage minimizes power loss in the current setting resistor for better efficiency. The TP3990 high-voltage output stage is perfect for driving mid-size and large panel displays containing up to ten white LEDs in series. LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation(PWM) signal. The enable input pin allows the device to be placed in shutdown mode with “zero” quiescent current.
The TP3990 is available in low profile TSOT23-5 package. 背光 led ic sot23
Features
* 2.6V to 5.5V Input Range
* 38V Output Over Voltage Protection
* Internal Soft-Start
* PWM Dimming Control
* Internal High Power 40V MOSFET Switch
* Fast 1MHz Switching Frequency
* Small, Low-Profile Inductors and Capacitors
* TSOT23-5 Package
* RoHS Compliant and 100% Lead (Pb)-Free
Applications
* GPS Navigation Systems
* Portable Media Players
* Handheld Devices, Digital Camera
* Portable Game Machines
