38V High Efficiency, Boost WLED Driver with Strobe Interface for Flash Mode CXLE87127 is a boost converter that drives LEDs in series. The boost converter has a 40V, 3A internal MOSFET; thus it can d

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With a 40V rated integrated switch FET, the CXLE87127 is a boost converter that drives LEDs in series. The boost converter has a 40V, 3A internal MOSFET; thus it can drive single or parallel LED strings for small to large size panel backlighting. And it is quite suitable for smart phone image capture using display device as a flash mode light source, as it can output up to 200mA current at 30V for 320ms when the strobe signal is active.kR4嘉泰姆

The backlight mode default white LED current is set with the external sensor resistor, RSET, and the feedback voltage is regulated to 200mV, as shown in the typical application. During the operation, the LED current can be controlled by a pulse width modulation (PWM) signal applied to the CTRL pin, through which the duty cycle determines the feedback reference voltage. The CXLE87127 does not burst the LED current; therefore, it does not generate audible noises on the output capacitor. For maximum protection, the device features integrated open LED protection that disables the CXLE87127 to prevent the output voltage from exceeding the IC absolute maximum voltage ratings during open LED conditions.kR4嘉泰姆

When the device is working, if the STROBE pin is pulled up, it will turn on flash mode within 100μs. And the feedback voltage is regulated to 5× of the backlight mode that determined by the PWM signal duty cycle. And it will turn to backlight mode within 100μs when the STROBE pin is pulled down or the strobe signal keeps high over the 320ms timer.kR4嘉泰姆

The CXLE87127 is available in Green TDFN-2×2-6L package. It operates over an ambient temperature range of -40℃</span> to +85℃</span>.kR4嘉泰姆

   产品特点 返回TOPkR4嘉泰姆

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• Input Voltage Range: 2.7V to 5.5V
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• Integrated 3A/40V MOSFETkR4嘉泰姆

• Output Voltage Up to 38V (OVP)kR4嘉泰姆

• Output Current Up to 200mA @ 30VkR4嘉泰姆

• Accumulated 320ms Flash Timer ControlkR4嘉泰姆

• 1.2MHz Switching FrequencykR4嘉泰姆

• PWM Dimming Control InterfaceskR4嘉泰姆

• PWM Frequency: 20kHz ~ 100kHzkR4嘉泰姆

• Strobe Interface for Image Capture ModekR4嘉泰姆

• Up to 87% Efficiency for 7S2P LEDskR4嘉泰姆

• Up to 92% Efficiency for 3S20P LEDskR4嘉泰姆

• Dimming Stable in 1:500 RangekR4嘉泰姆

• 200mV Feedback Voltage in Backlight ModekR4嘉泰姆

• 1000mV Feedback Voltage in Flash ModekR4嘉泰姆

• Built-In Soft-Start FunctionkR4嘉泰姆

• Over-Voltage ProtectionkR4嘉泰姆

• Built-In WLED Open/Short ProtectionkR4嘉泰姆

• PFM Mode at Light LoadkR4嘉泰姆

• Thermal ShutdownkR4嘉泰姆

• -40℃</span> to +85℃</span> Operating Temperature RangekR4嘉泰姆

• Available in Green TDFN-2×2-6L PackagekR4嘉泰姆

   应用范围 返回TOPkR4嘉泰姆

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Smart phoneskR4嘉泰姆

PDAs, Handheld ComputerskR4嘉泰姆

Backlight for Small and Medium Form-Factor LCD Display with Single-Cell Battery InputkR4嘉泰姆

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