LM3556TME/NOPB Integrated Circuits (ICs)

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The LM3556TME/NOPB is a fairly common “T-shaped” Primary-side Amplified Negative OR-ing Controller IC rated up to 8A. It is part of the Texas Instruments power management IC (PMIC) series, and is part of the company’s larger portfolio of products for the LED driver market. The LM3556 features an onboard high-side MOSFET and an adjustable boost control current source.

The amplifier control circuitry is integrated within the IC, which can accurately sense the current across the inductor and regulate the voltage for the output stage. This device can be configured for either a synchronous or diode-emulation forward converter topology, and it can also be used in applications that require reverse-converter structures. Additional features include single-channel programmable current mode control, adjustable start ramp times, over-temperature thermal shutdown protection, adjustable soft-start times, and over-current protection.

The LM3556TME/NOPB is most commonly used in LED driver applications due to its high efficiency and compact size. It can be used to drive both high and low side P-channel MOSFETs when used in a flyback or forward converter topology. It is well-suited for single-stage LED drivers, as well as multi-stage LED drivers. It is also able to drive multiple LEDs in series, allowing for higher brightness levels.

When used in LED driver applications, the LM3556TME/NOPB operates by first detecting the voltage across the inductor, which is proportional to the output current. This signal is used to regulate the output voltage of the LED driver by controlling the duty cycle of the high side MOSFET. This ensures that the output voltage of the LED driver is constant and well-regulated.

The LM3556TME/NOPB is also capable of shut-down control and thermal monitoring to help protect the LED driver against thermal overload. The LED driver can be programmed using the LM3556\'s SPI interface, which allows for programming of the current limits and over-current duration. The LM3556TME/NOPB also supports input current-limiting, as well as output open-circuit protection.

The LM3556TME/NOP is a reliable and efficient PMIC that can be used in a variety of LED driver applications. Its small size and high efficiency make it an ideal choice for single- and multi-stage LED drivers, which require a well-regulated output voltage and reliable thermal protection.

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