8521-TC-SA GE PLC / DCS intelligent module

8521-TC-SA GE PLC / DCS intelligent module

8521-TC-SA GE PLC / DCS intelligent module

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The S-8520/8521 Series is a CMOS step-down switching regulator-controller with PWM control (S-8520 Series) and PWM

/ PFM switching control (S-8521 Series). The S-8520/8521 Series has a reference voltage source, an oscillation circuit, an

error amplifier, and other components.

The S-8520 Series provides low-ripple power, high efficiency, and excellent transient characteristics due to a PWM control

circuit capable of varying the duty ratio linearly from 0% up to 100%. The S-8520/8521 Series also has a soft-start circuit

that prevents overshoot at startup.

The S-8521 Series works with either PWM control or PFM control. It normally operates using PWM control with a duty ratio

of 25% to 100%, but under a light load, it automatically switches to PFM control with a duty ratio of 25%. The S-8520/8521

Series ensures high efficiency over a wide range of conditions for devices, from the standby mode to the operation.

By adding external Pch power MOS FET or PNP transistor, coil, capacitor, and externally connected diode, the

S-8520/8521 Series can function as a step-down switching regulator, and is ideal for power supply units of portable

devices due to small SOT-23-5 and the feature of low current consumption. It is also ideal for AC adapters due to the input

voltage up to 16 V