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TPS61043DRB Datasheet(PDF) 4 Page - Texas Instruments |
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TPS61043DRB Datasheet(HTML) 4 Page - Texas Instruments |
4 / 27 page www.ti.com UVLO Bias + - - + CTRL EN VREF 0.252 V Thermal Shutdown Control Logic EN Gate Driver VIN OVP SW R1 1080 kW R2 25 kW Current Limit Softstart 4.5 ms 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 TPS61043 SLVS465A – DECEMBER 2003 – REVISED DECEMBER 2003 Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. CTRL 5 I Combined enable and PWM control pin. If CTRL is constantly pulled high, the device is enabled and the internal LED switch (Q2) is constantly turned on. When CTRL is pulled to GND, the device is disabled. Apply a PWM signal (100 Hz to 50 kHz) to this pin to control the brightness of the LEDs FB 4 I Feedback. FB regulates the LED current through the sense resistor by regulating the voltage across RS to 252 mV. GND 6 GND LED 1 I Input of the LED switch (Q2). Connect the LEDs to this pin. OVP 7 I Overvoltage protection. OVP is connected to the output capacitor of the converter. RS 2 O Output of the internal LED switch. The sense resistor that programs the LED current is connected to RS. SW 8 I Drain of the integrated switch (Q1) VIN 3 I Input supply pin. FUNCTIONAL BLOCK DIAGRAM 4 |
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