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ACT413 데이터시트 PDF




Active-Semi에서 제조한 전자 부품 ACT413은 전자 산업 및 응용 분야에서
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부품번호 ACT413 기능
기능 Quasi-Resonant PWM Controller
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ACT413 데이터시트, 핀배열, 회로
ACT413
Rev 2, 27-Feb-14
ActivePSRTM Quasi-Resonant PWM Controller
FEATURES
Patented Primary Side Regulation
Technology
Quasi-Resonant Operation
Adjustable up to 85kHz 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 Packages
mode including cycle-by-cycle current limiting.
ACT413 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.
ACT413 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 ACT413 is a high performance peak current
mode PWM controller which applies ActivePSRTM
and ActiveQRTM technology. ACT413 achieves
accurate voltage regulation without the need of an
opto-coupler or reference device.
The ACT413 is designed to achieve less than
100mW Standby Power. By applying frequency fold
back and ActiveQRTM technology, ACT413
exceeds the latest ES2.0 efficiency standard.
ACT413 integrates comprehensive protection. In
case of over temperature, over voltage, short
winding, short current sense resistor, open loop
and overload conditions, it would enter auto restart
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.




ACT413 pdf, 반도체, 판매, 대치품
ACT413
Rev 2, 27-Feb-14
ELECTRICAL CHARACTERISTICS CONT’D
VDD = 13V, LM = 0.6mH, RCS = 1.15, VOUT = 5V, NP = 102, NS = 7, NA = 17, TA = 25°C, unless otherwise specified,5V2.4A application.)
PARAMETER
RCORD
Output Cable Resistance
Compensation
GATE DRIVE
Gate Rise Time
Gate Falling Time
Gate Low Level ON-Resistance
Gate High Level ON-Resistance
Gate Leakage Current
COMPENSATION
SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
DVCOMP ACT413
TRISE
TFALL
RONLO
RONHI
VDD = 10V, CL = 1nF
VDD = 10V, CL = 1nF
ISINK = 30mA
ISOURCE = 30mA
GATE = 18V, before VDD
turn-on
6%
150 250
90
10
31
1
ns
ns
µA
Inside Compensate Resistor
Output Sink Current
Output Source Current
Transconductance of Error Amplifier
Maximum Output Voltage
Minimum Output Voltage
CS to COMP Gain
Pre-Amp Gain
COMP Leakage Current
OSCILLATOR
Maximum Switching
Maximum Duty Cycle
Minimum Switching Frequency
RCOMP ACT413
ICOMP_SINK VFB = 3V, VCOMP = 2V
ICOMP_SOUR VFB = 1.5V, VCOMP = 2V
CE
Gm
VCOMPMAX
VCOMPMIN
VFB = 1.5V
VFB = 3V
COMP = 2.5V
fMAX
DMAX
fMIN
0
15 40
15 40
71
3.5
0.4
2
1
k
µA
µA
µA/V
V
V
V/V
V/V
1 µA
76 85 94
65 75
1164
kHz
%
Hz
Innovative PowerTM
-4-
Active-Semi ProprietaryFor Authorized Recipients and Customers
ActivePSRTM is a trademark of Active-Semi.
www.active-semi.com
Copyright © 2014 Active-Semi, Inc.

4페이지










ACT413 전자부품, 판매, 대치품
ACT413
Rev 2, 27-Feb-14
FUNCTIONAL DESCRIPTION
ACT413 is a high performance peak current mode
low-voltage PWM controller IC. The controller
includes the most advance features that are
required in the adaptor applications up to 36 Watt.
Unique fast startup, frequency fold back, QR
switching technique, accurate OLP, low standby
mode operation, external compensation adjustment,
short winding protection, OCP, OTP, OVP and
UVLO are included in the controller.
Startup
Startup current of ACT413 is designed to be very
low so that VDD could be charged to VDDON
threshold level and device starts up quickly. A large
value startup resistor can therefore be used to
minimize the power loss yet reliable startup in
application. For a typical AC/DC adaptor with
universal input range design, two 1M, 1/8 W
startup resistors could be used together with a VDD
capacitor(4.7uF) to provide a fast startup and yet
low power dissipation design solution.
During startup period, the IC begins to operate with
minimum Ippk to minimize the switching stresses
for the main switch, output diode and transformers.
And then, the IC operates at maximum power
output to achieve fast rise time. After this, VOUT
reaches about 90% VOUT , the IC operates with a
‘soft-landing’ mode (decrease Ippk) to avoid output
overshoot.
Constant Voltage (CV) Mode Operation
In constant voltage operation, the ACT413 senses
the output voltage at FB pin through a resistor
divider network R5 and R6 in Figure 2. The signal
at FB pin is pre-amplified against the internal
reference voltage, and the secondary side output
voltage is extracted based on Active-Semi's
proprietary filter architecture.
transformer secondary and auxiliary turns, and VD
is the rectifier diode forward drop voltage at
approximately 0.1A bias.
Constant Current (CC) Mode Operation
When the secondary output current reaches a level
set by the internal current limiting circuit, the
ACT413 enters current limit condition and causes
the secondary output voltage to drop. As the output
voltage decreases, so does the flyback voltage in a
proportional manner. An internal current shaping
circuitry adjusts the switching frequency based on
the flyback voltage so that the transferred power
remains proportional to the output voltage, resulting
in a constant secondary side output current profile.
The energy transferred to the output during each
switching cycle is ½(LP × ILIM^2) × η, where LP is
the transformer primary inductance, ILIM is the
primary peak current, and η is the conversion
efficiency. From this formula, the constant output
current can be derived:
IOUTCC
=
1
2
×
Lp
×
(
VCS
RCS
)2 × ( η × fSW
VOUTCV
)
(2)
where fSW is the switching frequency and VOUTCV is
the nominal secondary output voltage. The constant
current operation typically extends down to lower
than 40% of nominal output voltage regulation.
Standby (No Load) Mode
In no load standby mode, the ACT413 oscillator
frequency is further reduced to a minimum
frequency while the current pulse is reduced to a
minimum level to minimize standby power. The
actual minimum switching frequency is
programmable with an output preload resistor.
Loop Compensation
This error signal is then amplified by the internal
error amplifier. When the secondary output voltage
is above regulation, the error amplifier output
voltage decreases to reduce the switch current.
When the secondary output voltage is below
regulation, the error amplifier output voltage
increases to ramp up the switch current to bring the
secondary output back to regulation. The output
regulation voltage is determined by the following
relationship:
VOUTCV
=
2 .20 V
× (1 +
R FB 1
R FB 2
)×
NS
NA
- VD
(1)
where RFB1 (R5) and RFB2 (R6) are top and bottom
feedback resistor, NS and NA are numbers of
The ACT413 allows external loop compensation by
connecting a capacitor to extend its applications,
especially with different VOUT in a wide output power
range.
Primary Inductance Compensation
The ACT413 integrates a built-in primary
inductance compensation circuit to maintain
constant OLP despite variations in transformer
manufacturing. The compensated ranges is +/-7%.
Primary Inductor Current Limit
Compensation
The ACT413 integrates a primary inductor peak
Innovative PowerTM
-7-
Active-Semi ProprietaryFor Authorized Recipients and Customers
ActivePSRTM is a trademark of Active-Semi.
www.active-semi.com
Copyright © 2014 Active-Semi, Inc.

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