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TPS61043 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS61043 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 31 page UVLO Bias + - - + CTRL EN VREF 0.252 V Thermal Shutdown Control Logic EN Gate Driver VIN OVP SW R1 1080 k R2 25 k Current Limit Softstart 4.5 µs Max On Time Overvoltage Protection 0.4 V Enable Control Logic EN PWM Gate Drive GND FB Error Comparator VREF 400 ns Min Off Time Q1 Q2 LED RS 8 TPS61043 SLVS465C – DECEMBER 2003 – REVISED FEBRUARY 2016 www.ti.com Product Folder Links: TPS61043 Submit Documentation Feedback Copyright © 2003–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS61043 operates like a standard boost converter but regulates the voltage across the sense resistor (RS) instead of the output voltage. This gives an accurate regulated LED current independent of the input voltage and number of LEDs connected. With integrated overvoltage protection (OVP) the TPS61043 is configured as a current source with overvoltage protection ideally suited to drive LEDs. The device can generate output voltages of up to 18 V and has an internal 400mA MOSFET switch (Q1). This allows several LEDs to be connected in series to the output. The internal LED switch (Q2) in series with the LEDs has a maximum current rating of 60 mA and disconnects the LEDs from ground during shutdown. The LED switch is driven by a PWM signal applied to the control pin (CTRL), which directly controls the LED brightness. With this control method the LED brightness depends on the PWM duty cycle only and is independent of the PWM frequency and amplitude. 8.2 Functional Block Diagram |
Similar Part No. - TPS61043_16 |
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Similar Description - TPS61043_16 |
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