LM3503SQ-16

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The LM3503SQ-16 is an advanced Pulse-Width Modulation (PWM) current-mode controller specifically designed for constant frequency non-isolated buck (step-down) applications. With its higher programmable frequency range of 200 kHz to 1.3 MHz, the LM3503SQ-16 is a versatile solution for most high performance LED lighting applications. It provides superior performance, flexibility and scalability, while offering high efficiency and low ripple current in an extremely small package.

The LM3503SQ-16 is an ideal LED driver for a variety of applications, such as LED backlighting, displays, automotive, and other general lighting applications. Its high PWM dimming efficiency and low cost enable high resolution LED dimming for cost-sensitive applications that require low power consumption. In addition, the LM3503SQ-16’s high switching frequency provides excellent flexibility and extremely small solution size for portable and mobile applications.

Application Field

The LM3503SQ-16 is an ideal LED driver for a variety of applications, such as LED backlighting, displays, automotive, and other general lighting applications. Its high PWM dimming efficiency and low cost enable high resolution LED dimming for cost-sensitive applications that require low power consumption. In addition, the LM3503SQ-16\'s high switching frequency provides excellent flexibility and extremely small solution size for portable and mobile applications.

The LM3503SQ-16 is designed for non-isolated , buck (step-down) DC/DC converter applications. The device offers a wide range of input voltage (3V to 40V) and bias voltage (3V to 16V) making it suitable for a variety of applications. The device is capable of operating at up to 1.3MHz, allowing for high efficiency, low power and better EMI performance. It is also capable of delivering a maximum output current of 600mA and has an integrated soft start and programmable spread spectrum feature. It is also capable of implementing both leading edge and trailing edge dimming for improved performance.

Working Principle

The LM3503SQ-16 operates as a buck (step-down) regulator, converting an input voltage to a lower output voltage as current flows through the device. It regulates output current by employing a control loop that senses current in the sense resistor and adjusts the duty cycle of the output PWM signal accordingly. The maximum current is determined by the setting of the external resistor, RS.

The LM3503SQ-16 features an input voltage range of 3V to 40V and a bias voltage range of 3V to 16V, making it suitable for a variety of applications. The device features a selectable 500kHz/1.3MHz oscillator, allowing for a wide range of output frequency. The device also features an integrated soft start circuit, as well as a programmable spread spectrum mode, to reduce EMI. The device also features over-temperature, under-voltage lockout, and over-current protection, making it well suited for a variety of applications.

The LM3503SQ-16 also features leading edge (Type 1) and trailing edge (Type 2) dimming control. Type 1 dimming provides higher efficiency, but with increased switching losses, while Type 2 dimming provides lower efficiency, but reduced switching losses.

In summary, the LM3503SQ-16 is an advanced Pulse-Width Modulation (PWM) current-mode controller specifically designed for constant frequency non-isolated buck (step-down) applications. The device features an input voltage range of 3V to 40V, a bias voltage range of 3V to 16V and is capable of delivering a maximum output current of 600mA, making it suitable for a variety of LED lighting applications. The device also features integrated soft start and programmable spread spectrum, making it well suited for reduced EMI. In addition, the LM3503SQ-16 features selectable leading edge (Type 1) and trailing edge (Type 2) dimming control, providing excellent flexibility and scalability in LED lighting designs.

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