Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ACT366 Datasheet(PDF) 6 Page - Active-Semi, Inc

Part No. ACT366
Description  High Performance ActivePSRTM Primary Switching Regulator
Download  11 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  ACTIVE-SEMI [Active-Semi, Inc]
Homepage  http://www.active-semi.com
Logo 

ACT366 Datasheet(HTML) 6 Page - Active-Semi, Inc

Zoom Inzoom in Zoom Outzoom out
 6 / 11 page
background image
ACT366
Rev 1, 14-Nov-12
Innovative Power
TM
- 6 -
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
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:
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.
Primary Inductance Compensation
The ACT366 integrates a built-in proprietary
(patent-pending) primary inductance compensation
circuit to maintain constant current regulation
despite variations in transformer manufacturing.
The compensated range is ±7%.
Primary Inductor Current Limit Compensation
The ACT366 integrates a primary inductor peak
current limit compensation circuit to achieve
constant input power over line and load ranges.
Protection
The ACT366 incorporates multiple protection
functions including over-voltage, over-current and
over-temperature.
Output Short Circuit Protection
When the secondary side output is short circuited,
the ACT366 enters hiccup mode operation. In this
condition, the VDD voltage drops below the VDDOFF
threshold
and
the
auxiliary
supply
voltage
collapses. This turns off the ACT366 and causes it
to restart. This hiccup behavior continues until the
short circuit is removed.
Output Over Voltage Protection
The
ACT366
includes
output
over-voltage
protection circuitry, which shuts down the IC when
the output voltage is 40% above the normal
regulation voltage for 4 consecutive switching
cycles. The ACT366 enters hiccup mode when an
output over voltage fault is detected.
Over Temperature Shutdown
The thermal shutdown circuitry detects the ACT366
die temperature. The typical over temperature
threshold is 135°C with 20°C hysteresis. When the
die temperature rises above this threshold the
ACT366 is disabled until the die temperature falls
by 20°C, at which point the ACT366 is re-enabled.
TYPICAL APPLICATION
Design Example
The design example below gives the procedure for
a DCM flyback converter using the ACT366. Refer
to Application Circuit in Figure 3, the design for a
adapter application starts with the following
specification:
The operation for the circuit shown in Figure 3 is as
follows: the rectifier bridge D3 and the capacitor
C1/C2 convert the AC line voltage to DC. This
voltage supplies the primary winding of the
transformer T1 and the startup resistor R7. The
primary power current path is formed by the
transformer’s primary winding, the NPN transistor,
the ACT366 internal MOSFET and the current
sense resistor R9. The network consisting of
capacitor C4 and diode D6 provides a VDD supply
voltage for ACT366 from the auxiliary winding of the
transformer. C4 is the decoupling capacitor of the
supply voltage and energy storage component for
startup. The diode D8 and the capacitor C5/C6
rectifies and filters the output voltage. The resistor
divider consisting of R5 and R6 programs the
output voltage.
The minimum and maximum DC input voltages can
be calculated:
FUNCTIONAL DESCRIPTION CONT’D
(2)
(3)
(4)
Input Voltage Range
85VAC - 265VAC, 50/60Hz
Output Power, PO
12W
Output Voltage, VOUTCV
12V
OCP Current, IOUTMAX
1.2A
Full Load Current, IOUTFL
1A
Transformer Efficiency,
ηxfm
0.89
System Efficiency CC,
ηsystem
0.78
System Efficiency CV,
η
0.79
)
V
f
η
(
)
R
9
.
0
V
396
.
0
(
L
2
1
I
OUTCV
SW
2
CS
P
OUTCC
×
×
×
×
×
=
V
375
265
2
V
2
V
ACMAX
INDCMAX
=
×
=
×
=
V
90
F
μ
10
15
%
78
)
ms
5
.
4
50
2
1
(
12
2
85
2
C
η
)
t
f
2
1
(
P
2
V
2
V
2
IN
C
L
OUT
2
ACMIN
INDCMIN
-
-
-
-
×
×
×
×
×
=
×
=


Html Pages

1  2  3  4  5  6  7  8  9  10  11 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn