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What is ACT412?

This electronic component, produced by the manufacturer "Active-Semi", performs the same function as "Quasi-Resonant PWM Controller".


ACT412 Datasheet PDF - Active-Semi

Part Number ACT412
Description Quasi-Resonant PWM Controller
Manufacturers Active-Semi 
Logo Active-Semi Logo 


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ACT412
Rev 1, 30-Oct-13
ActivePSRTM 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
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
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 ActiveQRTM 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
Innovative PowerTM
-1-
Active-Semi ProprietaryFor Authorized Recipients and Customers
ActivePSRTM is a trademark of Active-Semi.
www.active-semi.com
Copyright © 2013 Active-Semi, Inc.

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ACT412 equivalent
ACT412
Rev 1, 30-Oct-13
ELECTRICAL CHARACTERISTICS CONT’D
(VDD = 18V, LM = 0.5mH, RCS = 0.75, VOUT = 13V, NP = 68, NS =12, NA = 17, TA = 25°C, unless otherwise specified,12V0.4A applica-
tion)
PARAMETER
Protection
CS Short Waiting Time
CS Short Detection Threshold
CS Open Threshold Voltage
Abnormal OCP Blanking Time
Inductance Short CS Threshold Voltage
Thermal Shutdown Temperature
Thermal Hysteresis
Vo Short Detection Threshold
Line UVLO
Line UVLO Hysteresis
Line OVP
VFB Over Voltage Protection
Valley Detection
Valley Detection Time Window
SYMBOL TEST CONDITIONS
VFBUVLO
IFBUVLO
IFBOVP
VCOMP = 0.45V
MIN
2
TYP MAX UNIT
2.25 3
µs
0.1 0.15
V
1.75 V
190 ns
1.75 V
135 ˚C
20 ˚C
0.28 V
0.2 mA
20 µA
2.4 mA
3V
3.3 µs
Innovative PowerTM
-5-
Active-Semi ProprietaryFor Authorized Recipients and Customers
ActivePSRTM is a trademark of Active-Semi.
www.active-semi.com
Copyright © 2013 Active-Semi, Inc.


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Part Details

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Information Total 17 Pages
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Featured Datasheets

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ACT411The function is Quasi-Resonant PWM Controller. Active-SemiActive-Semi
ACT412The function is Quasi-Resonant PWM Controller. Active-SemiActive-Semi

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