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PDF ( 数据手册 , 数据表 ) ACT410

零件编号 ACT410
描述 Quasi-Resonant PWM Controller
制造商 Active-Semi
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ACT410 数据手册, 描述, 功能
ACT410
Rev 3, 27-Feb-14
ActivePSRTM Quasi-Resonant PWM Controller
FEATURES
Patented Primary Side Regulation
Technology
Quasi-Resonant Operation
Adjustable up to 120kHz Switching
Frequency
+/-5% Output Voltage Regulation
Accurate OCP/OLP Protection
Integrated Output Cord Compensation
Integrated Line and Primary Inductance
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
Less than 100mW Standby Power
Complies with Global Energy Efficiency and
CEC Average Efficiency Standards
Tiny SOT23-6 Package
and overload conditions, it would enter auto restart
mode including cycle-by-cycle current limiting.
ACT410 is to achieve no overshoot and very short
rise time even with big capacitive load (4000µF)
with the built-in fast and soft start process, .
The Quasi-Resonant (QR) operation mode can
effectively improve efficiency, reduce the EMI noise
and further reduce the components in input filter.
ACT410 is idea for application up to 36 Watt.
Figure 1:
Simplified Application Circuit
APPLICATIONS
AC/DC Adaptors/Chargers for Smart Phones,
iPADs, ADSL, PDAs, E-books
Adaptors for Portable Media Player, DSCs,
and Other
GENERAL DESCRIPTION
The ACT410 is a high performance peak current
mode PWM controller which applies ActivePSRTM
and ActiveQRTM technology. ACT410 achieves
accurate voltage regulation without the need of an
opto-coupler or reference device.
The ACT410 is designed to achieve less than
100mW Standby Power. By applying frequency fold
back and ActiveQRTM technology, ACT410
exceeds the latest ES2.0 efficiency standard.
ACT410 integrates comprehensive protection. In
case of over temperature, over voltage, short
winding, short current sense resistor, open loop
Innovative PowerTM
-1-
Active-Semi ProprietaryFor Authorized Recipients and Customers
ActivePSRTM is a trademark of Active-Semi.
www.active-semi.com
Copyright © 2014 Active-Semi, Inc.







ACT410 pdf, 数据表
ACT410
Rev 3, 27-Feb-14
FUNCTIONAL DESCRIPTION CONT’D
current limit compensation circuit to achieve
constant OLP over wide line and wide load range.
Output Cable Resistance Compensation
Protection Features
The ACT410 provides full protection functions. The
following table summarizes all protection functions.
The ACT410 provides internal programmable
output cable resistance compensation during
constant voltage regulation, monotonically adding
an output voltage correction up to predetermined
percentage at full power.
PROTECTION
FUNCTIONS
VDD Over Voltage
FAILURE
CONDITION
VDD > 20.5V
(4 duty cycle)
PROTECTION
MODE
Auto Restart
The feature allows better output voltage accuracy
by compensating for the output voltage drop due to
the output cable resistance.
VFB Over Voltage
Over Temperature
VFB > 3V
(4 duty cycle)
T > 135˚C
Auto Restart
Auto Restart
Frequency Fold-back
When the load drops to 75% of full load level,
ACT410 starts to decrease the switching frequency,
which is proportional to the load current ,to improve
the efficiency of the converter as show in Functional
Block Diagram.
This enables the application to meet all latest green
energy standards. The actual minimum switching
frequency is programmable with a small dummy
load (while still meeting standby power).
Valley Switching
ACT410 employed valley switching from medium
load to heavy load to reduce switching loss and
EMI. After the switch is turned off, the ringing
voltage from the auxiliary winding is applied to the
VFB pin through feedback network R5, R6.
Internally, the VFB pin is connected to an zero-
crossing detector to generate the switch turn on
signal when the conditions are met. In light load, the
frequency fold back scheme starts to take control to
determine the switch turn on signal, so thus the
switching frequency.
Figure 1:
Valley Switching at heavy load
Vdrain_gnd Mosfet
Short Winding/
Short Diode
Over Load
Output Short
Circuit
Open Loop
VCC Under
Voltage
VCS > 1.75V
Auto Restart
IPK = ILIMIT
VFB < 0.56V
Auto Restart
Auto Restart
No switching for
4 cycle
VCC < 6.8V
Auto Restart
Auto Restart
Auto-Restart Operation
ACT410 will enter auto-restart mode when a fault is
identified. There is a startup phase in the auto-
restart mode. After this startup phase the conditions
are checked whether the failure is still present.
Normal operation proceeds once the failure mode is
removed. Otherwise, new startup phase will be
initiated again.
To reduce the power loss during fault mode, the
startup delay control is implemented. The startup
delay time increases over lines.
Over Load Protection (OLP)
When the secondary output current reaches a level
set by the internal current limiting circuit, the
ACT410 enters current limit condition and causes
the secondary output voltage to drop, the IC enters
fault mode and enter auto restart mode.
DC voltage
ACT410 is able to achieve very accurate OLP
(constant IOUT) independent of input lines and
primary inductor values.
Possible Valley turn on Ton
t
Short Circuit Protection
When the secondary side output is short circuited,
the ACT410 enters hiccup mode operation. This
hiccup behavior continues until the short circuit is
removed.
T
Innovative PowerTM
-8-
Active-Semi ProprietaryFor Authorized Recipients and Customers
ActivePSRTM is a trademark of Active-Semi.
www.active-semi.com
Copyright © 2014 Active-Semi, Inc.







ACT410 equivalent, schematic
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Active-Semi:
ACT410US-T










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