ACT512 [ACTIVE-SEMI]
ActiveQR Quasi-Resonant PWM Controller; ActiveQR准谐振PWM控制器
| 型号： | ACT512 |
| 厂家： | 
ACTIVE-SEMI, INC |
| 描述： | ActiveQR Quasi-Resonant PWM Controller |
| 文件： | 总4页 (文件大小：178K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ACT512
Product Brief, 05-Dec-12
ActiveQRTM Quasi-Resonant PWM Controller
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.
FEATURES
• CCM and Quasi-Resonant Operation
• Adjustable up to 75kHz Switching Frequency
• OCP/OLP Protection
• Integrated Patented Frequency Foldback
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.
Technique
• Integrated Patented Line Compensation
• Built-in Soft-Start Circuit
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.
• Line Under-Voltage, Thermal, Output Over-
voltage, Output Short Protections
• Current Sense Resistor Short Protection
• Transformer Short Winding Protection
• 100mW Standby Power
ACT512 is for application up to 60 Watt.
• Complies with Global Energy Efficiency and
Figure 1:
CEC Average Efficiency Standards
Simplified Application Circuit
• 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 ActiveQRTM
technology, ACT512 increases the average system
efficiency compared to conventional solutions and
exceeds the latest ES2.0 efficiency standard with
good margin.
Innovative PowerTM
- 1 -
www.active-semi.com
ActiveQRTM is a trademark of Active-Semi.
Copyright © 2012 Active-Semi, Inc.
ACT512
Product Brief, 05-Dec-12
ORDERING INFORMATION
PACKING
METHOD
PART NUMBER
TEMPERATURE RANGE
PACKAGE PINS
TOP MARK
ACT512US-T
-40°C to 85°C
SOT23-6
6
TUBE & REEL
FSHT
PIN CONFIGURATION
SOT23-6
ACT512US
PIN DESCRIPTIONS
PIN
NAME
CS
DESCRIPTION
Current Sense Pin. Connect an external resistor (RCS) between this pin and ground to set peak
current limit for the primary switch.
1
2
3
4
GND
Ground.
GATE Gate Drive. Gate driver for the external MOSFET transistor.
VDD
VDET
FB
Power Supply. This pin provides bias power for the IC during startup and steady state operation.
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.
5
6
Feedback Pin. Connect this pin to optocouplers’s collector for output regulation.
Innovative PowerTM
- 2 -
www.active-semi.com
ActiveQRTM is a trademark of Active-Semi.
Copyright © 2012 Active-Semi, Inc.
ACT512
Product Brief, 05-Dec-12
Figure 4:
Universal VAC Input, 12V/2A Output Adaptor
Innovative PowerTM
- 3 -
www.active-semi.com
ActiveQRTM is a trademark of Active-Semi.
Copyright © 2012 Active-Semi, Inc.
ACT512
Product Brief, 05-Dec-12
Table 1:
ACT512 12V24W Bill of Materials
ITEM REFERENCE
DESCRIPTION
QTY
MANUFACTURER
Active-Semi
KSC
1
U1
C1
IC, ACT512, SOT23-6
1
1
1
1
2
1
1
1
4
2
1
1
2
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
2
1
1
1
2
Capacitor, Electrolytic, 47µF/400V, 16 × 14mm
Capacitor, Ceramic,1000pF/500V,0805,SMD
Capacitor, Electrolytic, 4.7µF/35V, 5 × 11mm
Capacitor, Electrolytic, 680µF/25V, 10 × 11.5mm
Capacitor, Ceramic, 0.1µF/50V,0805,SMD
Capacitor, Ceramic,1000pF/100V,0805,SMD
Capacitor, Ceramic,1000pF/50V,0805,SMD
Diode, Rectifier ,1000V2A, RL207, DO-41
Diode, Ultra Fast, FR107,1000V/1.0A, DO-41
Diode, Schottky, 100V/20A, SBL20100, DO-220
CM Inductor, 30mH, UU10.5
3
C3
POE
4
C4
KSC
5
C5,C6
C8
KSC
6
POE
7
C9
POE
8
Cfb
POE
9
D1-D4
D5,D6
D8
Good-Ark
Good-Ark
Good-Ark
SoKa
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
L1
Bead1,2
L3
T6*2*3, R5
SoKa
DM Inductor, 3µH, R5
SoKa
Q1
Mosfet Transisor, 4N65, TO-220F
PCB, L*W*T = 48.5х29х1.6mm, Cem-1, Rev:A
Fusible, 2A/250V
ST
PCB1
F1
Jintong
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
TY-OHM
R12
R2
Chip Resistor, 3.3kΩ, 0805, 5%
Carbon Resistor, 100kΩ, 2W, 5%
Chip Resistor, 100Ω, 0805, 5%
Chip Resistor, 4.7Ω, 0805, 5%
R3
R4
R5
Chip Resistor, 54.9kΩ, 0805, 1%
Chip Resistor, 11.7kΩ, 0805, 1%
Chip Resistor, 1MΩ, 0805, 5%
R6
R7,R8
R9
Chip Resistor, 0.87Ω,1W, 1%
R10
R14
R15
R16
Rgate
T1
Chip Resistor, 510Ω, 0805, 5%
Chip Resistor, 300kΩ, 0805, 5%
Chip Resistor, 23.7kΩ, 0805, 1%
Chip Resistor, 6.19kΩ, 0805, 1%
Chip Resistor, 47Ω, 0805, 5%
Transformer, LP = 0.8mH, RM8
Thermistor, SC053
NTC
TVS
CX1
CY1
U2
TY-OHM
TY-OHM
Varistor, 10471
X capacitance, 0.22µF/400V,X1
Y capacitance, 2200pF/400V,Y1
Opto-coupler, PC817C CTR = 200%
Voltage Regulator, TL431A, VREF = 2.5V
SEC
Sharp
ST
U3
Innovative PowerTM
ActiveQRTM is a trademark of Active-Semi.
- 4 -
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
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