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TD8201 Datasheet(PDF) 7 Page - TECHCODE SEMICONDUCTOR, INC. |
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TD8201 Datasheet(HTML) 7 Page - TECHCODE SEMICONDUCTOR, INC. |
7 / 11 page ![]() December, 20, 2011 Techcode Semiconductor Limited www.techcodesemi.com 7 Techcode® White LED Step-up Converter TD8201 DATASHEET Typical Application Circuit OPERATION DESCRIPTION The TD8201 uses a constant frequency, peak current mode boost regulator architecture to regulate the series string of white LEDs. The operation of the TD8201can be understood by referring to the simplified block diagram shown above. At the start of each oscillator cycle, the control logic turns on the power switch M1. The signal at the non‐inverting input of the PWM comparator is proportional to the switch current, summed together with a portion of the oscillator ramp When this signal reaches the level set by the output of error amplifier, the PWM comparator resets the latch in the control logic and turns off the power switch. In this manner, error amplifier sets the correct peak current level to keep the LED current in regulation. If the feedback voltage starts to drop, the output of the error amplifier increases. This results in more current to flow through M1, hence increasing the power delivered to the output. |
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