Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

TOP254PN Datasheet(PDF) 24 Page - Power Integrations, Inc.

Part No. TOP254PN
Description  Enhanced EcoSmart®, Integrated Off-Line Switcher with Advanced Feature Set and Extended Power Range
Download  48 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TOP254PN Datasheet(HTML) 24 Page - Power Integrations, Inc.

Back Button TOP254PN Datasheet HTML 20Page - Power Integrations, Inc. TOP254PN Datasheet HTML 21Page - Power Integrations, Inc. TOP254PN Datasheet HTML 22Page - Power Integrations, Inc. TOP254PN Datasheet HTML 23Page - Power Integrations, Inc. TOP254PN Datasheet HTML 24Page - Power Integrations, Inc. TOP254PN Datasheet HTML 25Page - Power Integrations, Inc. TOP254PN Datasheet HTML 26Page - Power Integrations, Inc. TOP254PN Datasheet HTML 27Page - Power Integrations, Inc. TOP254PN Datasheet HTML 28Page - Power Integrations, Inc. Next Button
Zoom Inzoom in Zoom Outzoom out
 24 / 48 page
background image
Rev. F 01/09
24
TOP252-262
www.powerint.com
A High Efficiency, 65 W, Universal Input Power Supply
The circuit shown in Figure 44 delivers 65 W (19 V @ 3.42 A) at
88% efficiency using a TOP260EN operating over an input
voltage range of 90 VAC to 265 VAC.
Capacitors C1 and C6 and inductors L1 and L2 provide
common mode and differential mode EMI filtering. Capacitor C2
is the bulk filter capacitor that ensures low ripple DC input to the
flyback converter stage. Capacitor C4 provides decoupling for
switching currents reducing differential mode EMI.
In this example, the TOP260EN is used at reduced current limit
to improve efficiency.
Resistors R5, R6 and R7 provide power limiting, maintaining
relatively constant overload power with input voltage. Line
sensing is implemented by connecting a 4 M
Ω impedance from
the V pin to the DC rail. Resistors R3 and R4 together form the
4 M
Ω line sense resistor. If the DC input rail rises above
450 VDC, then TOPSwitch-HX will stop switching until the
voltage returns to normal, preventing device damage.
This circuit features a high efficiency clamp network consisting
of diode D1, zener VR1, capacitor C5 together with resistors R8
and R9. The snubber clamp is used to dissipate the energy of
the leakage reactance of the transformer. At light load levels,
very little power is dissipated by VR1 improving efficiency as
compared to a conventional RCD clamp network.
The secondary output from the transformer is rectified by diode
D2 and filtered by capacitors C13 and C14. Ferrite Bead L3 and
capacitors C15 form a second stage filter and effectively reduce
the switching noise to the output.
Output voltage is controlled using a LM431 reference IC.
Resistor R19 and R20 form a potential divider to sense the
output voltage. Resistor R16 limits the optocoupler LED current
and sets the overall control loop DC gain. Control loop
compensation is achieved using C18 and R21. The components
connected to the control pin on the primary side C8, C9 and
R15 set the low frequency pole and zero to further shape the
control loop response. Capacitor C17 provides a soft finish
during startup. Optocoupler U2 is used for isolation of the
feedback signal.
Diode D4 and capacitor C10 form the bias winding rectifier and
filter. Should the feedback loop break due to a defective
component, a rising bias winding voltage will cause the zener
VR2 to break down and trigger the over voltage protection
which will inhibit switching.
An optional secondary side over voltage protection feature
which offers higher precision (as compared to sensing via the
bias winding) is implemented using VR3, R18 and U3. Excess
voltage at the output will cause current to flow through the
optocoupler U3 LED which in turn will inject current in the V-pin
through resistor R13, thereby triggering the over voltage
protection feature.
Figure 44.
65 W, 19 V Power Supply Using TOP260EN.
PI-4998-021408
R16
33
R21
1 k
R20
10 k
R19
68.1 k
R18
47
R16
680
U4
LM431
2%
VR3
BZX79-C22
22 V
D1
DL4937
D6
1N4148
D3
BAV19WS
D5
BAV19WS
VR2
1N5248B
18 V
VR1
BZY97C180
180 V
R13
5.1
R14
100
R12
5.1 k
R11
2 M
R1
2.2 M
R2
2.2 M
R15
6.8
R10
73.2 k
R8
100
R9
1 k
U3B
PC357A
U3A
PC357A
U2B
LTY817C
U2A
LTY817C
L3
Ferrite
Bead
L1
12 mH
L2
Ferrite Bead
U1
TOP260EN
C9
47 F
16 V
C16
1 F
50 V
C17
33 F
35 V
C18
100 nF
C11
100
nF
50 V
C10
22 F
50 V
D4 BAV19WS
D2
MBR20100CT
C8
100 nF
50 V
C4
100 nF
400 V
3KBP08M
BR1
C13
470 F
25 V
C14
470 F
25 V
C15
47 F
25 V
C12
1 nF
100 V
4
T1
RM10 FL1
FL2
5
3
2
6
C6
2.2 nF
250 VAC
C1
330 nF
275 VAC
F1
4 A
TOPSwitch-HX
L
E
N
19 V, 3.42 A
RTN
C2
120 F
400 V
C3
470 pF
250 VAC
C7
100 nF
25 V
C5
2.2 nF
1 kV
90 - 265
VAC
D
S
C
V
F
X
CONTROL
R3
2.0 M
R5
5.1 M
R4
2.0 M
R7
15 k
1%
R6
6.8 M


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48 


Datasheet Download

Go To PDF Page


Link URL




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

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   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