Part Number: TK12A80W.S4X(S

Manufacturer: Toshiba Semiconductor and Storage

Description: MOSFET N-CH 800V 11.5A TO220SIS

Shipped from: Shenzhen/HK Warehouse

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TK12A80W.S4X(S Description

The TK12A80W.S4X(S is a Super Junction Structure: DTMOS-based Switching Voltage Regulators with a low drain-source on-resistance of RDS(ON) = 0.38 (typ). Moreover, the Vth = 3.0 to 4.0 V (VDS = 10 V, I D = 0.57 mA) Enhancement mode and Easy to operate Gate switching are included.

TK12A80W.S4X(S Features

● Because of its Super Junction Structure, DTMOS has a low drain-source on-resistance of RDS(ON) = 0.38 (typical).

● The switching at the Gate is simple to regulate.

● Vth = 3.0–4.0 V (VDS = 10 V, I D = 0.57 mA) is the range for the boost mode.

Absolute Maximum Ratings

Characteristics Symbol Rating Unit
Drain-Source voltage VDSS 800 V
Gate-Source voltage VGSS +/-20 V
Drain current ID 11.5 A
Power Dissipation PD 45 W

Electrical Characteristics

Characteristics Symbol Condition Value Unit
The gate threshold voltage (Max) Vth 4.0 V
Drain-Source on-resistance (Max) RDS(ON) |VGS|=10V 450
Input capacitance (Typ.) Ciss 1400 pF
Total gate charge (Typ.) Qg VGS=10V 23 nC

What is a Switching Regulator?

A switching regulator is a circuit that regulates the flow of energy from its input to its output by utilizing a power switch, an inductor, and a diode. Within a feedback control loop, a switching controller IC is responsible for turning on and off the power switch, which is often a Field Effect Transistor (FET). This IC does this by monitoring the output of the switching regulator. This guarantees that it will keep producing the same output under standard working circumstances. The field effect transistor (FET) is a discrete component located outside the switching controller in some switching regulators. The FET and controller are combined into a single integrated circuit in certain implementations.

The fundamental components of the switching circuit can be changed to make an inverter, a step-down converter (also known as a buck converter), or a step-up converter (also known as a boost converter) (flyback).

Why Use a Switching Regulator instead of a Linear Regulator?

Comparatively speaking to linear regulators, switching regulators have three primary benefits to offer. To start, the switching efficiency can be significantly improved. Second, because the transfer of energy wastes less energy, the components can be made smaller, and the amount of thermal management needed can be reduced. Third, a switching regulator’s inductor can be used to invert the input voltage to a lower value (an inverter) or boost it above the input voltage (a boost), or it can be used to isolate the output voltage from the input voltage via a transformer.

In light of the benefits that are switching regulators provide, one may wonder what applications are suitable for linear regulators. Linear regulators have less noise and wider bandwidth than other types of regulators, and because of their simplicity, they are often the less expensive option. There is no denying that switching regulators come with their share of drawbacks. They have the potential to be noisy and call for the management of energy in the form of a control loop, which calls for a switching controller. Fortunately, the answer to these control issues can be found in the integrated circuits (ICs) used in today’s switching controllers.

Switching regulator characteristics

The following is a description of the properties of a non-isolated switching regulator.

High efficiency

A switching regulator can convert electricity at a high efficiency because it turns on and off a switching element and only supplies the required amount of electricity when required. This allows the switching regulator to save energy.

Another form of regulator, sometimes known as a stable power supply, is a linear regulator. However, in converting the voltage between VIN and VOUT, a linear regulator would waste any extra energy as heat, making it far less efficient than a switching regulator.

Comparing a switching regulator to a linear regulator is the simplest way to demonstrate how the switching regulator may achieve an efficient voltage conversion.


The sudden changes in voltage and current caused by the ON/OFF operations of the switching elements in a switching regulator and the parasitic components that generate ringing all contribute to the introduction of noise into the output voltage.

Reduce the circuit board’s noise by using the appropriate board layout and maximizing the effectiveness of positioning the capacitor, the inductor, and the wire.

Switching Voltage Regulator Design

The switching topology offers several potential benefits. The power device can function in two modes with minimal power loss while switching fully on and off. As a result, a switching regulator can have an overall efficiency of over 90%. As a result, the design is more compact than it would be with an equivalent linear solution, dissipating less heat.

On the other hand, the design of a switching regulator is far more complicated than the design of a linear device. To maintain the required level of VO in reaction to variations in VIN and the load, a controller needs to measure the voltage at the output and make continual adjustments to the duty cycle D.

Complicating matters further is the task of calculating the amount of the losses. DC conduction and AC switching losses may be seen in the buck converter illustrated in Figure 2. The voltage drop across the diode, the transistor, and the inductor when these components are conducting current is the source of the DC conduction losses. The conduction losses are a function of the duty cycle D, defined as the ratio between the on-time and the switching period. Because these devices only conduct some of the time, the duty cycle D is specified. The MOSFET switching losses, the loss owing to the switching transistor gate drive, the inductor core loss,  and the loss from the MOSFET’s body are all considered to be part of the AC switching losses.


A regulator’s primary purpose is to produce a constant DC output voltage regardless of changes in input voltage or load. The two most common techniques for doing this are linear and switching regulators. This essay has gone through both fundamentals, discussed their respective benefits and drawbacks, and compared how well they perform in numerous important categories.

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