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TPS61042

現行

採用 QFN-8 封裝且適用白光 LED 應用的 30-V、500-mA 開關升壓轉換器

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產品規格表

TPS61042

現行
產品規格表 立即訂購

產品詳細資料

Number of channels 1 Vin (min) (V) 1.8 Vin (max) (V) 6 Vout (min) (V) 1.8 Vout (max) (V) 28 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 88 LED current per channel (mA) 50 Peak efficiency (%) 85 Topology Boost Features Load Disconnect During Shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 1 Vin (min) (V) 1.8 Vin (max) (V) 6 Vout (min) (V) 1.8 Vout (max) (V) 28 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 88 LED current per channel (mA) 50 Peak efficiency (%) 85 Topology Boost Features Load Disconnect During Shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
VSON (DRB) 8 9 mm² 3 x 3
  • Current Source With Overvoltage Protection
  • Input Voltage Range: 1.8 V to 6 V
  • Internal 30 V Switch
  • Up to 85% Efficiency
  • Precise Brightness Control Using PWM Signal or
    Analog Signal
  • Switching Frequency: Up to 1 MHz
  • Internal Power MOSFET Switch: 500 mA
  • Operates With Small Output Capacitors Down to 100 nF
  • Disconnects LEDs During Shutdown
  • No Load Quiescent Current: 38 µA Typ
  • Shutdown Current: 0.1 µA Typ
  • Available in a Small 3 mm × 3 mm QFN Package
  • Current Source With Overvoltage Protection
  • Input Voltage Range: 1.8 V to 6 V
  • Internal 30 V Switch
  • Up to 85% Efficiency
  • Precise Brightness Control Using PWM Signal or
    Analog Signal
  • Switching Frequency: Up to 1 MHz
  • Internal Power MOSFET Switch: 500 mA
  • Operates With Small Output Capacitors Down to 100 nF
  • Disconnects LEDs During Shutdown
  • No Load Quiescent Current: 38 µA Typ
  • Shutdown Current: 0.1 µA Typ
  • Available in a Small 3 mm × 3 mm QFN Package

The TPS61042 is a high frequency boost converter with constant current output that drives white LEDs or similar. The LED current is set with the external sense resistor (RS) and is directly regulated by the feedback pin (FB) that regulates the voltage across the sense resistor RS to 252 mV (typ). To control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a frequency range of 100 Hz to 50 kHz to the control pin (CTRL). To allow higher flexibility, the device can be configured where the brightness can be controlled by an analog signal as well, as described in the application information section. To avoid possible leakage currents through the LEDs during shutdown, the control pin (CTRL) disables the device and disconnects the LEDs from ground. For maximum safety during operation, the output has integrated overvoltage protection that prevents damage to the device in case of a high impedance output (e.g. faulty LED).

The TPS61042 is a high frequency boost converter with constant current output that drives white LEDs or similar. The LED current is set with the external sense resistor (RS) and is directly regulated by the feedback pin (FB) that regulates the voltage across the sense resistor RS to 252 mV (typ). To control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a frequency range of 100 Hz to 50 kHz to the control pin (CTRL). To allow higher flexibility, the device can be configured where the brightness can be controlled by an analog signal as well, as described in the application information section. To avoid possible leakage currents through the LEDs during shutdown, the control pin (CTRL) disables the device and disconnects the LEDs from ground. For maximum safety during operation, the output has integrated overvoltage protection that prevents damage to the device in case of a high impedance output (e.g. faulty LED).
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類型 標題 日期
* Data sheet TPS61042 Constant Current LED Driver datasheet (Rev. D) PDF | HTML 2014年 12月 3日
Application note QFN and SON PCB Attachment (Rev. C) PDF | HTML 2023年 12月 6日
White paper Common LED Functions and LED Driver Design Considerations 2020年 9月 21日
Application note Performing Accurate PFM Mode Efficiency Measurements (Rev. A) 2018年 12月 11日
Selection guide Power Management Guide 2018 (Rev. R) 2018年 6月 25日
Application note Optimizing Transient Response of Internally Compensated DC-DC Converters (Rev. B) 2017年 11月 29日
Application note Extending the Soft Start Time Without a Soft Start Pin (Rev. B) 2017年 6月 15日
Analog Design Journal Design considerations for a resistive feedback divider in a DC/DC converter 2012年 4月 26日
Analog Design Journal IQ: What it is, what it isn’t, and how to use it 2011年 6月 17日
Application note White Light LED Driver With Gradual Dimming (Rev. A) 2007年 1月 10日
Application note Single Cell TPS61041 LED Driver 2003年 6月 9日
White paper White LED Power Supply Design Techniques 2003年 2月 18日
EVM User's guide TPS61042EVM-226 White Light LED Bias Supply EVM 2002年 9月 13日
Application note High Voltage Power Supply Using the TPS61040 2002年 7月 9日

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