Controller

CR6842 Datasheet PDF – Green-Power PWM Controller

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This is one of the PWM controller types.

Part Number: CR6842

Function: Green-Power PWM Controller

Manufacturer: Chip Rail

Package: DIP 8 Pin, SOP 8 Pin

See the preview image and the PDF file for more information.

CR6842 Pinouts :

CR6842 datasheet

 

Description

The CR6842 is a low startup current , low cost, current mode PWM controller with Green-Power & burst-mode power-saving operation. The integrated functions such as the leading-edge blanking of the current sensing, internal slope compensation provide the users a high efficiency, low external component counts, and low cost solution for AC/DC power applications.

Features

1. Low Cost, Green-Power Burst-Mode PWM
2. Very Low Start-up Current ( about 6μA)
3. Low Operating Current ( about 3mA)
4. Current Mode Operation
5. Under Voltage Lockout (UVLO)
6. VDD Over Voltage Protection(OVP)
7. programmable over-temperature protection
8. Internal Latch Circuit(OTP,OVP)
9. Built-in soft start with 1ms
10. Built-in Frequency jitter for better EMI Signature
11. Soft Clamped gate output voltage 16.5V

components

Applications

1. Power Adaptor
2. Battery Charger Adapter
3. Open Frame Switching Power Supply
4. LCD Monitor

 

CR6842 Datasheet PDF Download

CR6842 pdf

LX1684 Datasheet PDF – Voltage Mode PWM Controller

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Part Number: LX1684

Function: Voltage-Mode PWM Controller / DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC

Package: Surface Mount 14 Pin Type

Manufacturer: Microsemi Corporation

Pinouts:

LX1684 datasheet

Description

The LX1684 is a monolithic, voltage mode pulse-width modulator controller. It is designed to implement a flexible, low cost buck (step-down) regulator supply with a minimal of external components. Under-voltage lockout and soft-start provide for optimal start-up performance. The dual
functionality of the soft-start pin causes the LX1684 to enter a shutdown mode when pulled to
ground. The PWM switching frequency is fixed at 175kHz making the LX1684 optimized for
low-cost components. In addition short-circuit current limiting can be implemented without
expensive current sense resistors.

Features

1. Fixed 175kHz Switching Frequency
2. Constant Frequency Voltage-Mode Control Requires NO External Compensation
3. Hiccup-Mode Over-Current Protection
4. High Efficiency
5. Adjustable Output Voltage Set By Resistor Divider
6. Under-Voltage Lockout
7. Soft-Start And Enable
8. Synchronous Rectification

Application Circuts :

components

Applications

1. 12V to 3.3V Or Less Buck Regulators
2. Microprocessor Core Supplies
3. Hard Disk Drives
4. General 3.3V Supplies
5. Computer Add-on Cards
6. General Purpose DC:DC Conversion
7. Graphic Cards

Other data sheets are available within the file: LX1684CD, LX1684CD-TR

LX1684 Datasheet PDF Download


LX1684 pdf

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