ACT520SH-T

ACT520SH-T Datasheet


ACT520/ACT520A

Part Datasheet
ACT520SH-T ACT520SH-T ACT520SH-T (pdf)
Related Parts Information
EA520SH EA520SH EA520SH
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ACT520/ACT520A

ActiveQRTM Quasi-Resonant PWM Controller
• DCM and Quasi-Resonant Operation
• High VDD Sustain Voltage for Wide Output

Range Application such as QC2.0
• Primary Side Constant Current Control
• Integrated Patented Frequency Foldback

Technique
• Integrated Patented Line 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
• 30mW Standby Power
• Complies with Global Energy Efficiency and

CEC Average Efficiency Standards
• Sop-8 Packages
• AC/DC Adaptors/Chargers for Cell Phones,

Cordless Phone, PDAs, E-books
• Adaptors for Portable Media Player, DSCs,

Set-top boxes, DVD players, records
• Linear Adapter Replacements

The ACT520/ACT520A is a high performance peak current mode PWM controller. ACT520/ACT520A applies ActiveQRTM and frequency foldback technique to reduce EMI and improve efficiency. ACT520/ACT520A’s maximum design switching frequency is set at 130kHz. Very low standby power, good dynamic response and accurate voltage regulation is achieved with an opto-coupler and the secondary side control circuit.

The idle mode operation enables low standby power of 30mW with small output voltage ripple. By applying frequency foldback and ActiveQRTM technology, ACT520/ACT520A increases the average system efficiency compared to
conventional solutions and exceeds the latest ES2.0 efficiency standard with good margin.

ACT520/ACT520A integrates comprehensive protection. In case of over temperature, over voltage, short winding, short current sense resistor, open loop an d overload conditions, it would enter into auto restart mode including Cycle-by-Cycle current limiting.

ACT520/ACT520A is to achieve no overshoot and very short rise time even with big capacitive load with the built-in fast and soft start process.

In low line full load condition, ACT520/ACT520A is able to be designed to work in first valley turn on DCM mode to meet different types of applications. Quasi-Resonant QR operation mode can effectively improve efficiency during DCM operation, and reduce the EMI noise and further reduce the components in input filter.

ACT520/ACT520A uses an opto-coupler feedback architecture to provide accurate constant voltage even at low loads, constant current CV/CC regulation. Integrated line and primary inductance compensation circuitry provides accurate constant current operation despite wide variations in line voltage and primary inductance.

ACT520 is idea for QC2.0 adaptor application up to 30 Watt.

ACT520A is typical for low standby power <20mW 12W charger application.

Figure 1:

Simplified Application Circuit

Innovative PowerTM

ActiveQRTM is a trademark of Active-Semi.

Copyright 2015 Active-Semi, Inc.
ORDERING INFORMATION

ACT520SH-T ACT520ASH-T

TEMPERATURE RANGE
-40°C to 85°C

PACKAGE PINS

SOP-8

PACKING METHOD

TOP MARK

TUBE & REEL ACT520SH
-40°C to 85°C

SOP-8

TUBE & REEL ACT520ASH

PIN CONFIGURATION

SOP-8 ACT520SH

SOP-8 ACT520ASH

PIN DESCRIPTIONS

PIN NAME

EN Connect this to the gate of the N-depletion FET.

GATE Drive. Gate driver for the external MOSFET transistor.

GND Ground.

Current Sense Pin. Connect an external resistor RCS between this pin and ground to set peak current limit for the primary switch.

FB Feedback Pin. Connect this pin to optocouplers’s collector for output regulation.

VDET

Valley Detector Pin. Connect this pin to a resistor divider network from the auxiliary winding to detect zero-crossing points for valley turn on operation.

RT Connected through a NTC resistor to ground for adjustable OTP, or empty if not used.

VDD Power Supply. This pin provides bias power for the IC during startup and steady state operation.

Innovative PowerTM

ActiveQRTM is a trademark of Active-Semi.

Copyright 2015 Active-Semi, Inc.

ABSOLUTE MAXIMUM RATINGSc

PARAMETER

FB, CS, VDET to GND VDD, GATE to GND Maximum Power Dissipation SOP-8

VALUE
to + 6 to + 45

UNIT

Maximum Continuous VDD Current

Operating Junction Temperature
-40 to 150

Junction to Ambient Thermal Resistance Storage Temperature
160 -55 to 150

Lead Temperature Soldering, 10 sec
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Datasheet ID: ACT520SH-T 522480