ACT512 ACTIVE-SEMI | Alldatasheet

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Technical content

Innovative PowerTM - 1 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. ActiveQRTM is a trademark of Active-Semi. Product Brief, 05-Dec-12 ActiveQRTM Quasi-Resonant PWM Controller

FEATURES

  • CCM and Quasi-Resonant Operation
  • Adjustable up to 75kHz Switching Frequency
  • OCP/OLP Protection
  • 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
  • 100mW Standby Power
  • Complies with Global Energy Efficiency and CEC Average Efficiency Standards
  • Tiny SOT23-6 Packages

APPLICATIONS

  • 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 GENERAL DESCRIPTION The ACT512 is a high performance peak current mode PWM controller. ACT512 applies ActiveQRTM and frequency foldback technique to reduce EMI and improve efficiency. ACT512’s maximum design switching frequency is set at 75kHz. Very low standby power, good dynamic response and accurate voltage regulation is achieved with an opto-coupler and the secondary side control circuit. The burst mode operation enables low standby power of 100mW with small output voltage ripple. By applying frequency foldback and ActiveQR TM technology, ACT512 increases the average system efficiency compared to conventional solutions and exceeds the latest ES2.0 efficiency standard with good margin. ACT512 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. ACT512 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 full load condition, ACT512 is able to be designed to work in both CCM mode and 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. ACT512 is for application up to 60 Watt. Figure 1: Simplified Application Circuit ACT512

Product Brief, 05-Dec-12 Innovative PowerTM - 2 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. ActiveQRTM is a trademark of Active-Semi. PIN CONFIGURATION PIN DESCRIPTIONS PART NUMBER TEMPERATURE RANGE PACKAGE PINS PACKING METHOD TOP MARK ACT512US-T -40°C to 85°C SOT23-6 6 TUBE & REEL FSHT SOT23-6 ACT512US

ORDERING INFORMATION

1 CS Current Sense Pin. Connect an external resistor (RCS) between this pin and ground to set peak current limit for the primary switch. 2 GND Ground. 3 GATE Gate Drive. Gate driver fo r the external MOSFET transistor. 4 VDD Power Supply. This pin provides bias power fo r the IC during startup and steady state operation. 5 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. 6 FB Feedback Pin. Connect this pin to opt ocouplers’s collector for output regulation.

Product Brief, 05-Dec-12 Innovative PowerTM - 3 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. ActiveQRTM is a trademark of Active-Semi. Figure 4: Universal VAC Input, 12V/2A Output Adaptor

Product Brief, 05-Dec-12 Innovative PowerTM - 4 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. ActiveQRTM is a trademark of Active-Semi. ITEM REFERENCE DESCRIPTION QTY MANUFACTURER

1 U1 IC, ACT512, SOT23-6 1 Active-Semi

2 C1 Capacitor, Electrolytic, 47µF/400V, 16 × 14mm 1 KSC

3 C3 Capacitor, Ceramic,1000pF/500V,0805,SMD 1 POE

4 C4 Capacitor, Electrolytic, 4.7µF/35V, 5 × 11mm 1 KSC 5 C5,C6 Capacitor, Electrolytic, 680µF/25V, 10 × 11.5mm 2 KSC 6 C8 Capacitor, Ceramic, 0.1µF/50V,0805,SMD 1 POE

7 C9 Capacitor, Ceramic,1000pF/100V,0805,SMD 1 POE

8 Cfb Capacitor, Ceramic, 1000pF/50V,0805,SMD 1 POE

9 D1-D4 Diode, Rectifier ,1000V2A, RL207, DO-41 4 Good-Ark

10 D5,D6 Diode, Ultra Fast, FR107,1000V/1.0A, DO-41 2 Good-Ark

11 D8 Diode, Schottky, 100V/20A , SBL20100, DO-220 1 Good-Ark

12 L1 CM Inductor, 30mH, UU10.5 1 SoKa

13 Bead1,2 T6*2*3, R5 2 SoKa

14 L3 DM Inductor, 3µH, R5 1 SoKa

15 Q1 Mosfet Transisor, 4N65, TO-220F 1 ST

16 PCB1 PCB, L*W*T = 48.5 х29х1.6mm, Cem-1, Rev:A 1 Jintong

17 F1 Fusible, 2A/250V 1 TY-OHM

18 R12 Chip Resistor, 3.3k Ω, 0805, 5% 1 TY-OHM

19 R2 Carbon Resistor, 100k Ω, 2W, 5% 1 TY-OHM

20 R3 Chip Resistor, 100 Ω, 0805, 5% 1 TY-OHM

21 R4 Chip Resistor, 4.7 Ω, 0805, 5% 1 TY-OHM 22 R5 Chip Resistor, 54.9k Ω, 0805, 1% 1 TY-OHM 23 R6 Chip Resistor, 11.7k Ω, 0805, 1% 1 TY-OHM

24 R7,R8 Chip Resistor, 1M Ω, 0805, 5% 2 TY-OHM

25 R9 Chip Resistor, 0.87 Ω,1W, 1% 1 TY-OHM

26 R10 Chip Resistor, 510 Ω, 0805, 5% 1 TY-OHM

27 R14 Chip Resistor, 300k Ω, 0805, 5% 1 TY-OHM

28 R15 Chip Resistor, 23.7k Ω, 0805, 1% 1 TY-OHM 29 R16 Chip Resistor, 6.19k Ω, 0805, 1% 1 TY-OHM

30 Rgate Chip Resistor, 47 Ω, 0805, 5% 1 TY-OHM

31 T1 Transformer, L

P = 0.8mH, RM8 1

32 NTC Thermistor, SC053 1 TY-OHM

33 TVS Varistor, 10471 1 TY-OHM

34 CX1 X capacitance, 0.22µF/400V,X1 2

35 CY1 Y capacitance, 2200pF/400V,Y1 1 SEC

36 U2 Opto-coupler, PC817C CTR = 200% 1 Sharp

37 U3 Voltage Regulator, TL431A, V

REF = 2.5V 1 ST Table 1: ACT512 12V24W Bill of Materials