CS51033YDR8

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CS51033YDR8 Application Field and Working Principle

CS51033YDR8 is a fully featured DC-DC switch mode voltage regulator for synchronous buck topology used in automotive, industrial and consumer applications. This part is part of ON Semiconductor’s CS5xxx series of digital DC-DC switch mode voltage regulators. The series includes the most important circuit blocks to implement a DC-DC switch mode voltage regulator, such as a voltage reference, a buck PWM, a current sense amplifier and a power switch or FET.

The CS51033YDR8 integrates a dual-channel PWM controller, power FET and PFM/PWM switching. It enables flexible output voltage regulation and provides a high efficient multiple output control between 0.6V to 4.5V. Features include a high accuracy voltage reference, a wide adjustable switching frequency range (200kHz to 1MHz), an internal soft-start, pre-charge, output short circuit protection and undervoltage lockout (UVLO) as well as hiccup and over current protections.

Application Field of CS51033YDR8

The CS51033YDR8 is widely used in automotive, industrial and consumer applications:

• Automotive Boosters and Etc.
• Industrial DC-DC Power System Conversion
• Battery Backed Systems, Chargers and UPS systems
• Power Supply for Handheld Products

Other applications for CS51033YDR8 include voltage regulator module (VRM) for server, graphics card and single cell Li-ion battery applications.

Working Principle of CS51033YDR8

The CS51033YDR8 integrates the most important circuit blocks to implement a DC-DC switch mode voltage regulator, such as a voltage reference, a buck PWM, a current sense amplifier and a power switch or FET. Typically, the voltage regulator consists of two loops, an inner voltage and current loop and an outer voltage loop.

The voltage reference circuit of the CS51033YDR8 is the first circuit element in the regulator and supplies a stable output voltage with high accuracy, typically ±0.5%. This voltage reference is compared to the voltage at the input node of the voltage regulator in order to generate an error signal. This error signal is amplified through the inner voltage and current loop to generate a modulation signal, which is used to drive the power switch or FET.

The output current of the CS51033YDR8 is sensed by a current sense amplifier, and the resulting current feedback signal is used to adjust the PWM signal. The output voltage feedback signal is scaled and compared to the reference voltage to control the output voltage. The CS51033YDR8 also features a control signal that dynamically adjusts the operating frequency depending on the output current demand: the lower the output current, the lower the switching frequency.

To maximize power efficiency and eliminate power loss, the CS51033YDR8 has integrated PFM/PWM switching. PFM (pulse width modulation) mode is used when the load is light, and PWM mode is used when the load is heavy. The CS51033YDR8 also includes a soft start function, pre-charge function and UVLO function. Other integrated features include hiccup and over current protections, which guard against any potential damage.

Conclusion

In summary, the CS51033YDR8 is a high efficient DC-DC switch mode voltage regulator that allows flexible output voltage regulation and features a high accurate voltage reference, a wide adjustable switching frequency range, an internal soft-start, pre-charge, output short circuit protection and hiccup and over current protections.

The CS51033YDR8 is widely used in automotive, industrial and consumer applications, such as automotive boosters and etc., industrial DC-DC power system conversion, battery backed systems, chargers and UPS systems, power supply for handheld products, and voltage regulator module (VRM) for server, graphics card and single cell Li-ion battery applications.

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