ACT412 datasheet(1/17 Pages) ACTIVE-SEMI

Part #	ACT412

Description	Patented Primary Side Regulation Technology

PDF	17 Pages

Scroll/Zoom	100%

Manufacturer	ACTIVE-SEMI [Active-Semi, Inc]

Direct Link	http://www.active-semi.com

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1 / 17 page

Innovative PowerTM

- 1 -

www.active-semi.com

Active-Semi Proprietary―For Authorized Recipients and Customers

ActivePSR

TM is a trademark of Active-Semi.

ActivePSR

TM Quasi-Resonant PWM Controller

FEATURES

• Patented Primary Side Regulation

Technology

• Quasi-Resonant Operation

• Adjustable up to 120kHz Switching

Frequency

• +/-5% Output Voltage Regulation

• Constant Power Operation Mode for Fast

Start-up and Motor Drive Applications

• Integrated Line and Primary Inductance

Compensation

• Built-in Soft-Start Circuit

• Line Under-Voltage, Thermal, Output Over-

voltage, Output Short Protections

• Current Sense Resistor Short Protection

• Transformer Short Winding Protection

• Less than 100mW Standby Power

• Complies with Global Energy Efficiency and

CEC Average Efficiency Standards

• Tiny SOT23-6 Packages

APPLICATIONS

• AC/DC Adaptors/Chargers for E-Shaver,

Motor Driver, ADSL, Network Power, Cell

Phone

• Big Capacitive Load Application

GENERAL DESCRIPTION

The ACT412 is a high performance peak current

mode PWM controller which applies ActivePSRTM

and ActiveQRTM technology. ACT412 achieves

accurate voltage regulation without the need of an

opto-coupler or reference device.

The ACT412 is designed to achieve less than

100mW Standby Power. By applying frequency fold

back and

ActiveQR

TM

technology,

ACT412

exceeds the latest ES2.0 efficiency standard.

ACT412 integrates comprehensive protection. In

case of over temperature, over voltage, short

winding, short current sense resistor, open loop

and overload conditions, it would enter auto restart

mode including cycle-by-cycle current limiting.

ACT412 is to achieve no overshoot and very short

rise time even with big capacitive load (10000µF)

with the built-in fast and soft start process, .

The Quasi-Resonant (QR) operation mode can

effectively improve efficiency, reduce the EMI noise

and further reduce the components in input filter.

ACT412 is idea for application up to 36 Watt.

Figure 1:

Simplified Application Circuit

ACT412

Rev 1, 30-Oct-13

Similar Part No. - ACT412

Manufacturer	Part #	Datasheet	Description
Active-Semi, Inc	ACT410	301Kb / 16P	ActivePSRTM Quasi-Resonant PWM Controller Rev 3, 27-Feb-14
Qorvo, Inc	ACT41000	2Mb / 72P	Programmable Voltage, Programmable Current, Low Noise RFPoL Step-Down Voltage Regulator Rev. B, 01-Apr-2022
	ACT41000-101	2Mb / 72P	Programmable Voltage, Programmable Current, Low Noise RFPoL Step-Down Voltage Regulator Rev. B, 01-Apr-2022
	ACT41000-102	2Mb / 72P	Programmable Voltage, Programmable Current, Low Noise RFPoL Step-Down Voltage Regulator Rev. B, 01-Apr-2022
	ACT41000-103	2Mb / 72P	Programmable Voltage, Programmable Current, Low Noise RFPoL Step-Down Voltage Regulator Rev. B, 01-Apr-2022

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