71922-120BLF

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The 71922-120BLF originates from the family of stand-alone ICs produced by Ricoh and is utilized extensively in the power supply systems in consumer electronics, office automation equipment, and instrumentation. The 71922-120BLF is a pulse-width modulator (PWM) IC, further classified as a single-output PWM switching regulator. Its typical application field and operating principle are discussed in the following sections.

The primary application field of the 71922-120BLF is the control of a single output switching regulator comprising buck, boost, or buck-boost topologies. This IC enables a robust system that can provide a fixed voltage or current with minimal external components. This IC has a host of features that make it more attractive than its analog counterparts such as a lower power dissipation, space-saving size, and cost.

The 71922-120BLF is a highly integrated device and comprises three internal blocks: a power stage composed of SW-L, SW-S, R-SET, R-CTRL, R-SENSE, and R-FB; an internal oscillator and modulator; and an error amplifier and logic. The power stage consists of two MOSFETs (SW-L and SW-S); the R-SET resistor sets the current sourcing capability of the source MOSFET, SW-S; the R-CTRL resistor adjusts the current limit of the source MOSFET; the R-SENSE resistor divides the voltage set by the error amplifier into a current for the power stage; and the R-FB resistor forms the output voltage feedback loop. The internal oscillator and modulator are used to generate the PWM signal as the output of the device; the frequency is determined by the externally connected CR_L, which is typically a ceramic capacitor of 1uF to 10uF.

The error amplifier is responsible for comparing the feedback voltage to the internal voltage set by the external R-SET resistor; if the voltage difference is larger than a certain threshold, the output switch is activated and current is sourced to the output. The logic block is responsible for providing the digital control signals to the internal latch that controls the state of the two power MOSFETs and the STATUS pin, which displays the device status.

The 71922-120BLF is a versatile device capable of accurately controlling voltage or current when exposed to an input voltage ranging from ±20V to ±50V with a maximum output current of 120A. The device’s internal MOSFETs are rated at 110A, thus providing ample power for most applications. Additionally, the device’s high switching frequency (typical switching frequency of 300kHz) enables low output voltage ripple and fast transient response times.

The 71922-120BLF is a simple and effective device for applications requiring the control of a single output. It is a highly integrated device that comprises the necessary logic, modulation and power elements, making it a competitive choice for a wide range of applications. It is capable of providing a stable output voltage and/or current, and its small footprint and low power dissipation make it ideal for applications requiring both high accuracy and dynamic performance.

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