STSTP4CMP带电荷泵四路LED驱动解决方案
2012-07-10
作者：ST公司
</a>LED" title="LED">LED" title="LED">LED驱动器,设计用于RGB照明或LCD显示器背光.支持正向电压高达成3.8V的LED,工作电压 2.7 V到5.5 V,四路电流可单独编程,最大电流30mA,输出电流精度 ±7%,通路间电流匹配度在 ±4%内.主要用在手机显示器背光和RGB LED指示器驱动器.本文介绍了STP4CMP主要特性,框图,典型应用电路及其所用元件,STP4CMP评估板及其电路图,STEVAL-TLL012V1演示板主要特性和电路图,材料清单.
The STP4CMP is a charge pump based 4-channel LED driver designed for RGB illumination or LCD display backlighting. The STP4CMP works off a battery with an input voltage between 2.7 V - 5.5 V. The device generates regulated current sinks with high absolute and channel-tochannel accuracy to drive up to 4 LEDs. It can support LEDs with forward voltage as high as 3.8 V. The current sink for each channel can be set with 4 individual external resistors. Each channel is controlled independently. The PWM control can be applied directly to the 4 EN (enable) pins to provide brightness control. When enabled, the charge pump, which uses a small ceramic bucket capacitor between C1P and C1N, operates to regulate the VOUT with a clamping voltage at typ.
5 V. The tiny QFN20 (1.8 x 3.2 mm) package allows the device to be also used for applications with space limitation.
STP4CMP主要特性:
■ Operating voltage range: VCC (opr) = 2.7 V to 5.5 V
■ Full RGB function support
■ 4-channel LED driver with individual ON/OFF control directly from input pins
■ Individual programmable output current for the 4 channels through 4 external resistors with a max. capability of 30 mA
■ Absolute output current accuracy of max. ±7% and channel-to-channel mismatch of max. ± 4%
■ Selectable charge pump enable/disable
■ Thermal protection
■ Small QFN20 (1.8 x 3.2 mm) package
STP4CMP应用:
■ Mobile phone display backlighting
■ RGB LED indicator drivers
图1.STP4CMP方框图
图2.STP4CMP应用框图
图2应用电路外接元件:
图3.STP4CMP评估板外形图
图4.STP4CMP评估板电路图
STEVAL-TLL012V1演示板
The STEVAL-TLL012V1 demonstration board demonstrates the performance of the STP4CMP, a charge pump based 4-channel LED driver designed for RGB illumination or LCD display backlighting.
This device works off a battery with an input voltage between 2.7 V - 5.5 V. The device generates regulated current sinks with high absolute and channel-to-channel accuracy to drive up to 4 LEDs. It can support LEDs with forward voltage as high as 3.8 V.
The current sink for each channel can be set with 4 individual external resistors. Each channel is controlled independently.
The PWM control can be applied directly to the 4 EN (enable) inputs to provide brightness control.
STEVAL-TLL012V1演示板主要特性:
■ Operating voltage range: 2.7 V to 5.5 V
■ Full RGB function support
■ 4-channel LED driver with individual ON/OFF control directly from input pins
■ Individual programmable output current for the 4 channels through 4 external resistors with a max. capability of 30 mA
■ Absolute output current accuracy of max. ±7% and channel-to-channel mismatch of max. ± 4%
■ Selectable charge pump enable/disable
■ Thermal protection
■ RoHS compliant
图5.STEVAL-TLL012V1演示板外形图
图6.STEVAL-TLL012V1演示板电路图
STEVAL-TLL012V1演示板材料清单:
详情请见:
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00236423.pdf
和
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATA_BRIEF/DM00056350.pdf
The STP4CMP is a charge pump based 4-channel LED driver designed for RGB illumination or LCD display backlighting. The STP4CMP works off a battery with an input voltage between 2.7 V - 5.5 V. The device generates regulated current sinks with high absolute and channel-tochannel accuracy to drive up to 4 LEDs. It can support LEDs with forward voltage as high as 3.8 V. The current sink for each channel can be set with 4 individual external resistors. Each channel is controlled independently. The PWM control can be applied directly to the 4 EN (enable) pins to provide brightness control. When enabled, the charge pump, which uses a small ceramic bucket capacitor between C1P and C1N, operates to regulate the VOUT with a clamping voltage at typ.
5 V. The tiny QFN20 (1.8 x 3.2 mm) package allows the device to be also used for applications with space limitation.
STP4CMP主要特性:
■ Operating voltage range: VCC (opr) = 2.7 V to 5.5 V
■ Full RGB function support
■ 4-channel LED driver with individual ON/OFF control directly from input pins
■ Individual programmable output current for the 4 channels through 4 external resistors with a max. capability of 30 mA
■ Absolute output current accuracy of max. ±7% and channel-to-channel mismatch of max. ± 4%
■ Selectable charge pump enable/disable
■ Thermal protection
■ Small QFN20 (1.8 x 3.2 mm) package
STP4CMP应用:
■ Mobile phone display backlighting
■ RGB LED indicator drivers
图1.STP4CMP方框图
图2.STP4CMP应用框图
图2应用电路外接元件:
图3.STP4CMP评估板外形图
图4.STP4CMP评估板电路图
STEVAL-TLL012V1演示板
The STEVAL-TLL012V1 demonstration board demonstrates the performance of the STP4CMP, a charge pump based 4-channel LED driver designed for RGB illumination or LCD display backlighting.
This device works off a battery with an input voltage between 2.7 V - 5.5 V. The device generates regulated current sinks with high absolute and channel-to-channel accuracy to drive up to 4 LEDs. It can support LEDs with forward voltage as high as 3.8 V.
The current sink for each channel can be set with 4 individual external resistors. Each channel is controlled independently.
The PWM control can be applied directly to the 4 EN (enable) inputs to provide brightness control.
STEVAL-TLL012V1演示板主要特性:
■ Operating voltage range: 2.7 V to 5.5 V
■ Full RGB function support
■ 4-channel LED driver with individual ON/OFF control directly from input pins
■ Individual programmable output current for the 4 channels through 4 external resistors with a max. capability of 30 mA
■ Absolute output current accuracy of max. ±7% and channel-to-channel mismatch of max. ± 4%
■ Selectable charge pump enable/disable
■ Thermal protection
■ RoHS compliant
图5.STEVAL-TLL012V1演示板外形图
图6.STEVAL-TLL012V1演示板电路图
STEVAL-TLL012V1演示板材料清单:
详情请见:
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00236423.pdf
和
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATA_BRIEF/DM00056350.pdf
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