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.mB8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.mB8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.mB8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>.mB8嘉泰姆

   产品特点 返回TOPmB8嘉泰姆

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• Input Voltage Range: 2.7V to 5.5V
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• Integrated 3A/40V MOSFETmB8嘉泰姆

• Output Voltage Up to 38V (OVP)mB8嘉泰姆

• Output Current Up to 200mA @ 30VmB8嘉泰姆

• Accumulated 320ms Flash Timer ControlmB8嘉泰姆

• 1.2MHz Switching FrequencymB8嘉泰姆

• PWM Dimming Control InterfacesmB8嘉泰姆

• PWM Frequency: 20kHz ~ 100kHzmB8嘉泰姆

• Strobe Interface for Image Capture ModemB8嘉泰姆

• Up to 87% Efficiency for 7S2P LEDsmB8嘉泰姆

• Up to 92% Efficiency for 3S20P LEDsmB8嘉泰姆

• Dimming Stable in 1:500 RangemB8嘉泰姆

• 200mV Feedback Voltage in Backlight ModemB8嘉泰姆

• 1000mV Feedback Voltage in Flash ModemB8嘉泰姆

• Built-In Soft-Start FunctionmB8嘉泰姆

• Over-Voltage ProtectionmB8嘉泰姆

• Built-In WLED Open/Short ProtectionmB8嘉泰姆

• PFM Mode at Light LoadmB8嘉泰姆

• Thermal ShutdownmB8嘉泰姆

• -40℃</span> to +85℃</span> Operating Temperature RangemB8嘉泰姆

• Available in Green TDFN-2×2-6L PackagemB8嘉泰姆

   应用范围 返回TOPmB8嘉泰姆

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Smart phonesmB8嘉泰姆

PDAs, Handheld ComputersmB8嘉泰姆

Backlight for Small and Medium Form-Factor LCD Display with Single-Cell Battery InputmB8嘉泰姆

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