深圳市桑尼奇科技有限公司

 SGM3766

38V High Efficiency, Boost WLED Driver with PWM Contro

1 With a 40V rated integrated switch FET, the SGM3766 is a boost converter that drives LEDs in series. The boost converter has a 40V, 2.75A internal MOSFET; thus it can drive single or parallel LED strings for small to large size panel backlighting.

The 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 SGM3766 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 SGM3766 to prevent the output voltage from exceeding the IC absolute maximum voltage ratings during open LED conditions.

The SGM3766 is available in Green TSOT-23-5 package. It operates over an ambient temperature range of -40℃ to +85℃.（点击即可咨询芯片详细信息）

2 • 1:500 Stable Luminance Dimming
• Low EMI by Conducting Ringing Cancelling
• Improved PSRR for Waveless Lighting
• Input Voltage Range: 2.7V to 5.5V
• Integrated 40V, 2.75A Current Limit MOSFET
• 38V Open LED Protection for 10 LEDs in Series
• 1.2MHz Switching Frequency
• 200mV Reference Voltage
• PWM Brightness Control
• Under-Voltage Protection
• Up to 90% Efficiency
• Built-In Soft-Start Function
• Thermal Shutdown
• -40℃ to +85℃ Operating Temperature Range
• Available in Green TSOT-23-5 Package

3• Smart Phone Backlighting
• Tablet Backlighting
• PDAs, Handheld Computers, GPS Receivers
• Portable Media Players, Portable TVs
• White LED Backlighting for Small and Media Form Factor Displays

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