ACTIVE-SEMI ACT361

ACT361
Active-Semi
Product Brief, 15-Apr-11
High Performance ActivePSRTM Primary Switching Regulator
The ACT361 ensures safe operation with complete
protection against all fault conditions. Built-in
protection circuitry is provided for output shortcircuit, output over-voltage, line under-voltage, and
over temperature conditions.
FEATURES
• Patented Primary Side Regulation
Technology
• No Opto-Coupler
The ACT361 ActivePSRTM is optimized for high
performance, cost-sensitive applications, and
utilizes Active-Semi’s proprietary primary-side
feedback architecture to provide accurate constant
voltage, constant current (CV/CC) regulation
without the need of an opto-coupler or reference
device. Integrated line and primary inductance
compensation circuitry provides accurate constant
current operation despite wide variations in line
voltage and primary inductance. Integrated output
cord resistance compensation further enhances
output accuracy. The ACT361 achieves excellent
regulation and transient response, yet requires less
than 150mW of standby power.
• Best-in-Class Constant Voltage, Constant
Current Accuracy
•
•
•
•
Low EMI
Proprietary Fast Startup Circuit
Built-in Soft-Start Circuit
Integrated Line and Primary Inductance
Compensation
• Integrated Programmable Output Cord
Resistance Compensation
• Line Under-Voltage, Output Over-Voltage,
Output Short-Circuit and Over-Temperature
Protection
The ACT361 is optimized for 2W to 7W
applications. It is available in space-saving 6 pin
SOT23-6 package.
• Complies with all Global Energy Efficiency
and CEC Average Efficiency Standards
• Adjustable power from 2W to 7W
• Minimum External Components
• Tiny SOT23-6 Package
Figure 1:
Simplified Application Circuit
APPLICATIONS
INPUT
• Chargers for Cell Phones, PDAs, MP3,
OUTPUT
Portable Media Players, DSCs, and Other
Portable Devices and Appliances
• RCC Adapter Replacements
• Linear Adapter Replacements
• Standby and Auxiliary Supplies
VDD
BD
GENERAL DESCRIPTION
ACT361
The ACT361 belongs to the high performance
patented ActivePSRTM Family of Universal-input
AC/DC off-line controllers for battery charger and
adapter applications. It is designed for flyback
topology working in discontinuous conduction mode
(DCM). The ACT361 meets all of the global energy
efficiency regulations (CEC, European Blue Angel,
and US Energy Star standards) while using very
few external components.
Innovative PowerTM
ActivePSRTM is a trademark of Active-Semi.
SW
CS
FB
G
-1-
www.active-semi.com
Copyright © 2011 Active-Semi, Inc.
ACT361
Product Brief, 15-Apr-11
ORDERING INFORMATION
PART NUMBER
TEMPERATURE RANGE
PACKAGE
PINS
PACKING
METHOD
TOP MARK
ACT361US-T
-40°C to 85°C
SOT23-6
6
TAPE & REEL
FSCR
PIN CONFIGURATION
1
G
2
BD
3
FSCR
SW
6
CS
5
FB
4
VDD
SOT23-6
ACT361US-T
PIN DESCRIPTIONS
PIN
NAME
1
SW
2
G
3
BD
4
VDD
5
FB
Feedback Pin. Connect this pin to a resistor divider network from the auxiliary winding.
6
CS
Current Sense Pin. Connect an external resistor (RCS) between this pin and ground to set peak
current limit for the primary switch. The peak current limit is set by (0.396V × 0.9) / RCS. For more
detailed information, see Application Information.
Innovative PowerTM
DESCRIPTION
Switch Drive. Switch node for the external NPN transistor. Connect this pin to the external power
NPN’s emitter. This pin also supplies current to VDD during startup.
Ground.
Base Drive. Base driver for the external NPN transistor.
Power Supply. This pin provides bias power for the IC during startup and steady state operation.
-2-
www.active-semi.com
Copyright © 2011 Active-Semi, Inc.
ACT361
Product Brief, 15-Apr-11
Figure 3:
Universal VAC Input, 5V/0.7A Output Charger
L1
FR1
L
T1
R1
D4
D1
VO
R2
D3
D2
+
C1
+
C2
R10
D7
D5
R11
C7
+
Q1
N
GND
R4
R8
BD
R5
VDD
SW
ACT361
G
FB
CS
R7
C3
R9
Table 1:
ACT361 Bill of Materials
ITEM
REFERENCE
1
U1
2
C1, C2
DESCRIPTION
QTY
MANUFACTURER
IC, ACT361US-T, SOT23-6
1
Active-Semi
Capacitor, Electrolytic, 4.7µF/400V, 8 × 12mm
2
KSC
3
C3
Capacitor, Electrolytic, 4.7µF/35V, 5 × 11mm
1
POE
4
C7
Capacitor, Electrolytic, 470µF/10V, 8 × 12mm
1
KSC
5
D1-D4
Diode, Rectifier, 1000V/1A, 1N4007, DO-41
4
Good-Ark
6
D5
Diode, Ultra Fast, FR102,100V/1.0A, DO-41
1
Good-Ark
7
D7
Diode, Schottky, 40V/2A, SB240, DO-15
1
Good-Ark
8
L1
Axial Inductor, 1.5mH, 0410, DIP
1
Amode Tech
9
Q1
Transistor, NPN, 900V,1.5A, KSB13003AR, TO-92
1
Semi How
10
FR1
Fusible Resistor, 1W, 10Ω, 5%
1
TY-OHM
11
R1, R2
Chip Resistor, 5.1MΩ, 1206, 5%
2
TY-OHM
12
R4
Chip Resistor, 150k, 0805, 5%
1
TY-OHM
13
R5
Chip Resistor, 22Ω, 0603, 5%
1
TY-OHM
14
R7
Chip Resistor, 1.07Ω, 1206, 1%
1
TY-OHM
15
R8
Chip Resistor, 53.6k, 0805, 1%
1
TY-OHM
16
R9
Chip Resistor, 9.76k, 0805, 1%
1
TY-OHM
17
R10
Chip Resistor, 22Ω, 0805, 5%
1
TY-OHM
18
R11
Chip Resistor, 1.1k, 0805, 5%
1
TY-OHM
19
T1
Transformer, LP = 2.3mH±7%, EE16
1
Innovative PowerTM
-3-
www.active-semi.com
Copyright © 2011 Active-Semi, Inc.