ACT361 Datasheet PDF - Active-Semi

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ACT361
Active-Semi

Part Number ACT361
Description High Performance ActivePSR Primary Switching Regulator
Page 13 Pages


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ACT361
Rev 8, 14-Nov-12
High Performance ActivePSRTM Primary Switching Regulator
FEATURES
Patented Primary Side Regulation
Technology
No Opto-Coupler
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
Complies with all Global Energy Efficiency
and CEC Average Efficiency Standards
Adjustable power from 2W to 7W
Minimum External Components
Tiny SOT23-6 Package
The ACT361 ensures safe operation with complete
protection against all fault conditions. Built-in
protection circuitry is provided for output short-
circuit, output over-voltage, line under-voltage, and
over temperature conditions.
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.
The ACT361 is optimized for 2W to 7W
applications. It is available in space-saving 6 pin
SOT23-6 package.
Figure 1:
Simplified Application Circuit
APPLICATIONS
Chargers for Cell Phones, PDAs, MP3,
Portable Media Players, DSCs, and Other
Portable Devices and Appliances
RCC Adapter Replacements
Linear Adapter Replacements
Standby and Auxiliary Supplies
GENERAL DESCRIPTION
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.
INPUT
VDD
BD
ACT361
SW
CS FB
G
OUTPUT
Innovative PowerTM
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Copyright © 2012 Active-Semi, Inc.



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ACT361
Rev 8, 14-Nov-12
ORDERING INFORMATION
PART NUMBER
ACT361US-T
TEMPERATURE RANGE
-40°C to 85°C
PACKAGE PINS
SOT23-6
6
PACKING
METHOD
TAPE & REEL
TOP MARK
FSCR
PIN CONFIGURATION
SW 1
G2
BD 3
6 CS
5 FB
4 VDD
SOT23-6
ACT361US-T
PIN DESCRIPTIONS
PIN NAME
DESCRIPTION
1
SW
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.
2 G Ground.
3 BD Base Drive. Base driver for the external NPN transistor.
4 VDD Power Supply. This pin provides bias power for the IC during startup and steady state operation.
5 FB Feedback Pin. Connect this pin to a resistor divider network from the auxiliary winding.
Current Sense Pin. Connect an external resistor (RCS) between this pin and ground to set peak
6 CS 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
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Copyright © 2012 Active-Semi, Inc.



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ACT361
Rev 8, 14-Nov-12
ABSOLUTE MAXIMUM RATINGSc
PARAMETER
VDD, BD, SW to G
Maximum Continuous VDD Current
FB, CS to G
Continuous SW Current
Maximum Power Dissipation (derate 4.5mW/˚C above TA = 50˚C)
Junction to Ambient Thermal Resistance (θJA)
Operating Junction Temperature
Storage Junction
Lead Temperature (Soldering, 10 sec)
VALUE
-0.3 to +28
100
-0.3 to +6
Internally limited
0.45
220
-40 to 150
-55 to 150
300
UNIT
V
mA
V
A
W
˚C/W
˚C
˚C
˚C
c: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may
affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = 14V, VOUT = 5V, LP = 2.3mH, NP = 140, NS = 10, NA = 27, TA = 25°C, unless otherwise specified.)
PARAMETER
Supply
VDD Turn-On Voltage
VDD Turn-Off Voltage
Supply Current
Start Up Supply Current
BD Current during Startup
Internal Soft Startup Time
Oscillator
Switching Frequency
Maximum Switching Frequency
Maximum Duty Cycle
Feedback
Effective FB Voltage
FB Leakage Current
Output Cable Resistance
Compensation
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
VDDON
VDDOFF
IDD
IDDST
IBDST
VDD Rising from 0V
VDD Falling after Turn-on
VDD = 14V, after Turn-on
VDD = 14V, before Turn-on
17.6 18.6 19.6
5.25 5.5 5.75
12
25 45
1
10
V
V
mA
µA
µA
ms
fSW
FCLAMP
DMAX
100% VOUTCV @ full load
25% VOUTCV @ full load
42
kHz
21
45 55 kHz
70 75 80 %
VFB
IFBLK
DVCOMP
No RCORD between VDD and SW
RCORD = 300k
RCORD = 150k
RCORD = 75k
RCORD = 33k
2.176
2.200
0
3
6
9
12
2.224
100
V
nA
%
Innovative PowerTM
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Copyright © 2012 Active-Semi, Inc.



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ACT361
Rev 8, 14-Nov-12
ELECTRICAL CHARACTERISTICS CONT’D
(VDD = 14V, VOUT = 5V, LP = 2.3mH, NP = 140, NS = 10, NA = 27, TA = 25°C, unless otherwise specified.)
PARAMETER
Current Limit
SW Current Limit Range
CS Current Limit Threshold
Leading Edge Blanking Time
Driver Outputs
Switch ON-Resistance
SW Off Leakage Current
Protection
VDD Latch-Off Voltage
Thermal Shutdown Temperature
Thermal Hysteresis
Line UVLO
SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
ILIM
VCSLIM
tOFF_DELAY = 0
100 600 mA
380 396 412 mV
200 300
ns
RON
ISW = 50mA
VSW = VDD = 22V
1.6
5 µA
VDDOVP
IFBUVLO
VDDON
+2
VDDON
+3
135
20
116
VDDON
+4
V
˚C
˚C
µA
FUNCTIONAL BLOCK DIAGRAM
VDD
REGULATOR ON
&
UVLO
REFERENCE
FB
2.20V
SIGNAL
FILTER
CABLE
COMPENSATION
CURRENT
SHAPING
BD
0.4V
SW
BASE
DRIVER
OTP
OVP
LOGIC
OSCILLATOR
G CS
Innovative PowerTM
- 4 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.



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