Part Number: SD4841, SD4840 Thru SD4844

Function: Current Mode PWM( Pulse Width Modulation )  Controller

Package: DIP 8 Pin

Manufacturer: Silan Microelectronics

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Description

This is CURRENT MODE PWM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET.

The SD4841 is a current mode PWM controller with low standby power and low start current for power switch. In standby mode, the circuit enters burst mode to reduce the standby power dissipation. The switch frequency is 67KHz with ±2.5 KHz jitter frequency for low EMI. The stress on transformer during power on is reduced by the builtin 15ms soft start circuit to avoid the saturation of transformer.

Pinout

1. SGND : GND of control circuit
2. PGND : GND of MOSFET
3. VCC : Power supply
4. FB : Feedback input
5. NC : No connection
6. Drain : Drain end of MOSFET
7. Drain : Drain end of MOSFET
8. Drain : Drain end of MOSFET

Features

A current mode PWM (Pulse Width Modulation) controller is an electronic device used in power electronic circuits to regulate the output voltage of a power supply. It compares a reference signal to a feedback signal from the output of the power supply and adjusts the duty cycle of the PWM signal sent to a power switch to maintain the desired output voltage.

The main advantage of current mode control over voltage mode control is that it can provide a faster response to changes in the load current, making it more suitable for applications with rapidly changing loads. It also offers better noise immunity and improved stability over a wider range of operating conditions.

1. Lower start-up current (Typ.6μA)

2. Frequency jitter for low EMI

3. Overcurrent protection

4. Overvoltage protection

5. Undervoltage lockout

6. Built-in temperature protection

7. Built-in high voltage MOSFET

Applications:

1. Switch power

 

Block Diagram

 

Other data sheets are available within the file: SD4840, SD4840P67K65, SD4841, SD4841P67K65, SD4842

SD4841 Datasheet PDF Download

Part Number: OZ960S

Function: Intelligent CCFL Inverter Controller

Package: SOP 20 Pin type

Manufacturer: O2Micro International

Image and Pinouts:

 

Description

The OZ960 is a unique, high-efficiency, Cold Cathode Fluorescent Lamp (CCFL) backlight
inverter controller that is designed for wide input voltage inverter applications. Additionally, the
OZ960 performs the lamp dimming function with an analog voltage or low frequency Pulse Width
Modulation (PWM) control.

The OZ960S operates at a single, constant frequency in a phase-shift PWM mode. Intelligent open-lamp and over-voltage protections provide design flexibility so various transformer models / manufacturers may be used.

The built-in burst mode control provides a wide dimming range and simplifies the application circuit designs. Both operating and burst-mode frequencies are user-programmable parameters.

Features

• Supports wide-range voltage input applications (8v to 20v)

• Built-in intelligence to manage ignition and normal operation of CCFLs

• Reduces the number of components and board size by 30% compared with conventional designs

• 85% efficiency vs. typical 70% efficiency of conventional designs

Other data sheets are available within the file:

OZ960D, OZ960G, OZ960ID, OZ960IG, OZ960IS

 

OZ960S Datasheet PDF Download