NCP1397B PDF Datasheet – Resonant Mode Controller

Part Number: NCP1397B

Function: High Performance Resonant Mode Controller

Package: SO-16 Pin Type

Manufacturer: ON Semiconductor

Images:NCP1397B pdf controller


The NCP1397B is a high performance controller that can be utilized in half bridge resonant topologies such as series resonant, parallel resonant and LLC resonant converters. It integrates 600 V gate drivers, simplifying layout and reducing external component count. With its unique architecture, including a 500 kHz Voltage Controlled Oscillator whose control mode permits flexibility when an ORing function is required, the NCP1397 delivers everything needed to build
a reliable and rugged resonant mode power supply.

resonant controller, is an electronic device or integrated circuit (IC) used in power electronics to control the operation of resonant mode power supplies. Resonant mode power supplies are a type of switching power supply known for their efficiency and reduced electromagnetic interference (EMI) compared to traditional pulse-width modulation (PWM) power supplies.


1. High−Frequency Operation from 50 kHz up to 500 kHz

2. 600 V High−Voltage Floating Driver

3. Adjustable Minimum Switching Frequency with ±3% Accuracy

4. Adjustable Deadtime from 100 ns to 2 μs.

5. Startup Sequence Via an Externally Adjustable Soft−Start

6. Brown−Out Protection for a Simpler PFC Association

NCP1397B datasheet pinout


1. Flat Panel Display Power Converters

2. High Power ac−dc Adapters for Notebooks

3. Computing Power Supplies

Other data sheets are available within the file: NCP1397, NCP1397A, NCV1397A, NCV1397B

NCP1397B PDF Datasheet

THX-203H PDF Datasheet – Switching Power Controller IC

This post explains for the Controller.

The Part Number is THX-203H.

The function of this semiconductor is Switching Power Controller.

Manufacturer: ETC

Preview images :

THX-203H pinout controller


THX-203H is Switching Power Controller IC. This is a semiconductor device designed to control and regulate the operation of a switching power supply (SMPS). SMPSs are widely used to efficiently convert one voltage level to another, making them crucial components in various electronic devices, including power adapters, voltage regulators, LED drivers, and more. Switching Power Controller ICs play a central role in governing the switching operation of power transistors, thereby regulating the output voltage or current.

PWM controller of high-performance current mode is specially designed for AC/DC transformer with high performance and price ratio, which supplies continuous output power of 12W within the range of wide-voltage between 85V and 265V, the output power of peak value can be up to 18W.

The combination of optimized reasonable circuit design and bipolar facture technology with high performance and price ratio economizes the whole cost ultimately. The power controller can be applied to the typical flyback circuit topology so as to form a simple AC/DC


1. Set-in high-voltage power switch tube of 700V and few peripheral components

2. With the modulation of lock pulse width, the testing is according to the pulse limit

3. With the function of output frequency reduction, the non-output power consumption can
be less than 0.3W.

4. Inner-built ramp and anti-feedback compensation function

Block Diagram

THX-203H datasheet


1. Adaptor (for example, travel charger, out power station)

2. Open Frame (for example, DVD, DVB)

THX-203H PDF Datasheet