Product introduction

The TP8305B is a step-up DC/DC converter designed to drive white LEDs with a wide input voltage range (0.8~5.5V), adjustable constant current and limited current modes. The frequency conversion mode is adopted to limit the current cycle by cycle, so that the input and output currents change uniformly with the decrease of the power supply voltage. The device can drive a single high-power white LED with a single or double dry battery, and can also drive two, three or more WLEDs with a single lithium battery. The method of driving the WLEDs in series can provide equal WLED currents, resulting in uniform brightness.

The low feedback voltage of 46mV minimizes power dissipation in the current regulation resistor, improving efficiency. The current limit feedback voltage of 46mV can be set according to different needs.

The difference between TP8305B and TP8305 is that in current limiting mode, as the input voltage decreases, TP8305 input and output current

There will be a sudden change at a certain point, TP8305B adopts the frequency conversion mode to avoid this phenomenon. All other functions remain unchanged. Please refer to the last description of the specification for details.

Features

External MOS tube, adjustable output voltage, can drive high-voltage, high-power loads, such as 10V1A.

·Drive 0.3W-7W single white LED

·Can drive multiple WLED lights

·Efficiency up to 90%_ ·0.8V extremely low operating voltage (V DD to Vout)

·Constant current accuracy: ±5%_ ·Current limiting accuracy ±6%; ultra-low current limiting voltage 46mV

·Chip VDD overvoltage shutdown

·Temperature protection function (130℃ protection point)

Scope of application

Constant current source, such as LED flashlight, backlight module, etc.

Constant voltage source, such as bluetooth speaker, mobile power supply, etc.

Occasions that need to accurately limit the input current, such as LED flashlights with current limiting schemes

typical application:

Constant voltage and current limiting function to drive the load scheme.