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LD7660J PDF Datasheet – Low Power Off-line Switcher

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Part Number: LD7660J, LD7660JGN

Function: Low Power Off-line Switcher

An off-line switcher, also known as an offline switch-mode power supply (SMPS) controller or off-line flyback controller, is an integrated circuit (IC) or semiconductor device used in power supply designs to convert high-voltage AC (alternating current) mains voltage to a lower DC (direct current) voltage for various electronic devices. These controllers are specifically designed for offline power supplies, which operate directly from the mains power source, typically at voltages such as 100V to 240V AC.

Package: DIP 8 Pin Type

Manufacturer: Leadtrend

Images:

LD7660J pdf pinout

Description

The LD7660J integrated a 600V power MOSFET and a current mode PWM controller in a DIP-8 package. It’s operating at fixed frequency of 65 kHz. It provides important functions needed for a low output power applications such as leading-edge blanking of the current sensing, internal slope compensation, and green-mode power-saving operation under light load or no load condition.

This highly integrated device provides the users a high efficiency, low external component counts, and low cost solution for low power adaptor or charger applications. The special green-mode control is not only to achieve the low power consumption but also to offer a non-audible-noise operation when the LD7660J is operating under light load or no load condition.

Features

1. Built-in 600V/1A Power MOSFET

2. Secondary-side/Primary-side feedback control

3. Switching Frequency at 65KHz

4. Fixed Internal Frequency Trembling

5. Built-in Load Regulation Compensation

6. Built-in Slope Compensation with 75% max duty-cycle

7. Low Startup Current (<20μA)

8. Current Mode Control with Cycle-by-Cycle Current Limit

9. Non-audible-noise Green Mode Control

LD7660J datasheet

 

1. AC to DC Conversion: Off-line switchers take the high-voltage AC input from the mains and convert it into a lower DC voltage suitable for powering electronic devices. This process involves rectification, filtering, and voltage regulation.

2. Switching Operation: Off-line switchers use high-frequency switching to convert the AC input voltage into a high-frequency AC signal. This allows for smaller and more efficient transformers and reduces the size and weight of the power supply.

 

Applications:

1. Switching AC/DC Adaptor

2. LCD TV or PC Standby Power

 

LD7660J PDF Datasheet

THX-203H PDF Datasheet – Switching Power Controller IC

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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

Description

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
transformer.

Features

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
current.

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

Applications:

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

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

THX-203H PDF Datasheet