NCP1256BSN65T1G

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The NCP1256BSN65T1G, available from On Semiconductor, is a high current, low on-resistance synchronous 4-Phase buck PWM controller with integrated over-current protection, featuring voltage or current based loop compensation. It is suitable for synchronous buck applications needing fast transient response, good line and load regulation and is targeted for use in computer and telecom power systems applications.

NCP1256BSN65T1G is classed as a PMIC (Power Management Integrated Circuit), which is a device that provides power management capabilities in a wide range of electronic products, including AC-DC converters, DC-DC converters, offline switchers, and linear regulators. The NCP1256BSN65T1G can be used for applications such as power conversion of +48V Distributed Power Systems, powering processor cores and chipsets in server and communication systems, powering remote radios and digital signal processors, and as core power supply in a variety of high current applications.

The main purpose of the NCP1256BSN65T1G is to provide efficient power conversion from +48V input voltage to a wide range of output voltages with current per phase up to 5.5A. The device uses two independent pre-biased current-mode PWM controllers with PLL function, providing four phases of output current in order to reduce the output voltage ripple effectively. It also provides an overcurrent protection (OCP) circuit to prevent the external MOSFETs from being damaged when overcurrent condition occurs.

The NCP1256BSN65T1G works on a Voltage-Mode or Current-Mode PWM control principle. In Voltage-Mode PWM control, the voltage across the output inductor is measured, compared to the programmed output voltage (Vout). Depending on the result of the comparison, the PWM signal is generated to the MOSFET, the applied voltage of which can be either high or low. This causes the inductor current to change, and thus the output voltage is adjusted and regulated.

In Current-Mode PWM control, the inductor current is measured, compared to the programmed output current (Iout). Depending on the result of the comparison, the PWM signal is generated to the MOSFET, the applied voltage of which can be either high or low. This causes the output voltage to change so that the inductor current is regulated.

The NCP1256BSN65T1G integrates extensive protection circuitry to guarantee the long-term reliability of the device. The integrated over current protection circuit includes Maximum Peak Current Protection, Voltage Droop Control (VDROOP), Under Voltage Lockout (UVLO), and Over Voltage Protection (OVP). Additionally, a Power Good signal (PGOOD) is output, which indicates when the output voltage reaches its target level.

With its excellent current capability and full integration of protection features, the NCP1256BSN65T1G is ideal for use in a wide variety of AC-DC offline switcher and converter applications. Its small size and high efficiency make it especially suitable for high power applications.

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