Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

LNK304GN Datasheet(PDF) 7 Page - Power Integrations, Inc.

Part No. LNK304GN
Description  LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

LNK304GN Datasheet(HTML) 7 Page - Power Integrations, Inc.

Back Button LNK304GN Datasheet HTML 3Page - Power Integrations, Inc. LNK304GN Datasheet HTML 4Page - Power Integrations, Inc. LNK304GN Datasheet HTML 5Page - Power Integrations, Inc. LNK304GN Datasheet HTML 6Page - Power Integrations, Inc. LNK304GN Datasheet HTML 7Page - Power Integrations, Inc. LNK304GN Datasheet HTML 8Page - Power Integrations, Inc. LNK304GN Datasheet HTML 9Page - Power Integrations, Inc. LNK304GN Datasheet HTML 10Page - Power Integrations, Inc. LNK304GN Datasheet HTML 11Page - Power Integrations, Inc. Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 20 page
background image
2-7
LNK302/304-306
7
Rev. I 11/08
Table 2 (cont). Common Circuit Configurations Using LinkSwitch-TN.
TOPOLOGY
BASIC CIRCUIT SCHEMATIC
KEY FEATURES
Low-Side
Buck Boost –
Optocoupler
Feedback
1. Output referenced to input
2. Positive output (V
O) with respect to +VIN
3. Step up/down – V
O > VIN or VO < VIN
4. Optocoupler feedback
- Accuracy only limited by reference
choice
- Low cost non-safety rated opto
- No pre-load required
5. Fail-safe – output is not subjected to input
voltage if the internal MOSFET fails
provides the lowest cost and highest efficiency converter. CCM
designs require a larger inductor and ultra-fast (t
rr ≤35 ns)
freewheeling diode in all cases. It is lower cost to use a larger
LinkSwitch-TN in MDCM than a smaller LinkSwitch-TN in CCM
because of the additional external component costs of a CCM
design. However, if the highest output current is required, CCM
should be employed following the guidelines below.
Topology Options
LinkSwitch-TN can be used in all common topologies, with or
without an optocoupler and reference to improve output voltage
tolerance and regulation. Table 2 provide a summary of these
configurations. For more information see the Application
Note – LinkSwitch-TN Design Guide.
Component Selection
Referring to Figure 5, the following considerations may be
helpful in selecting components for a LinkSwitch-TN design.
Freewheeling Diode D1
Diode D1 should be an ultra-fast type. For MDCM, reverse
recovery time t
rr ≤75 ns should be used at a temperature of
70
°C or below. Slower diodes are not acceptable, as continuous
mode operation will always occur during startup, causing high
leading edge current spikes, terminating the switching cycle
prematurely, and preventing the output from reaching regulation.
If the ambient temperature is above 70
°C then a diode with
t
rr ≤35 ns should be used.
For CCM an ultra-fast diode with reverse recovery time
t
rr ≤35 ns should be used. A slower diode may cause excessive
leading edge current spikes, terminating the switching cycle
prematurely and preventing full power delivery.
Fast and slow diodes should never be used as the large reverse
recovery currents can cause excessive power dissipation in the
diode and/or exceed the maximum drain current specification
of LinkSwitch-TN.
Feedback Diode D2
Diode D2 can be a low-cost slow diode such as the 1N400X
series, however it should be specified as a glass passivated type
to guarantee a specified reverse recovery time. To a first order,
the forward drops of D1 and D2 should match.
Inductor L1
Choose any standard off-the-shelf inductor that meets the
design requirements. A “drum” or “dog bone” “I” core
inductor is recommended with a single ferrite element due to
its low cost and very low audible noise properties. The typical
inductance value and RMS current rating can be obtained from
the LinkSwitch-TN design spreadsheet available within the
PI Expert design suite from Power Integrations. Choose L1
greater than or equal to the typical calculated inductance with
RMS current rating greater than or equal to calculated RMS
inductor current.
Capacitor C2
The primary function of capacitor C2 is to smooth the inductor
current. The actual output ripple voltage is a function of this
capacitor’s ESR. To a first order, the ESR of this capacitor
should not exceed the rated ripple voltage divided by the typical
current limit of the chosen LinkSwitch-TN.
Feedback Resistors R1 and R3
The values of the resistors in the resistor divider formed by
R1 and R3 are selected to maintain 1.65 V at the FB pin. It is
recommended that R3 be chosen as a standard 1% resistor of
2 k
Ω. Thisensuresgoodnoiseimmunitybybiasingthefeedback
network with a current of approximately 0.8 mA.
Feedback Capacitor C3
Capacitor C3 can be a low cost general purpose capacitor. It
provides a “sample and hold” function, charging to the output
voltage during the off time of LinkSwitch-TN. Its value should
be 10
μF to 22 μF; smaller values cause poorer regulation at
light load conditions.
LinkSwitch-TN
PI-3756-111903
+
BP
FB
D
S
V
O
V
IN
+


Similar Part No. - LNK304GN

ManufacturerPart No.DatasheetDescription
Power Integrations, Inc.
Power Integrations, Inc...
LNK304GN POWERINT-LNK304GN Datasheet
712Kb / 20P
   LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
LNK304GN POWERINT-LNK304GN Datasheet
867Kb / 16P
   Lowest Component Count, Energy Efficient Off-Line Switcher IC
LNK304GN-TL POWERINT-LNK304GN-TL Datasheet
712Kb / 20P
   LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
LNK304GN-TL POWERINT-LNK304GN-TL Datasheet
1Mb / 19P
   Lowest Component Count, Energy-Efficient Off-Line Switcher IC
December 2021
LNK304GNTL POWERINT-LNK304GNTL Datasheet
712Kb / 20P
   LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
More results

Similar Description - LNK304GN

ManufacturerPart No.DatasheetDescription
Power Integrations, Inc.
Power Integrations, Inc...
LNK302P POWERINT-LNK302P Datasheet
712Kb / 20P
   LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
LNK306DN-TL POWERINT-LNK306DN-TL Datasheet
712Kb / 20P
   LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
LNK302GN POWERINT-LNK302GN Datasheet
712Kb / 20P
   LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
LNK304DN POWERINT-LNK304DN Datasheet
711Kb / 20P
   Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
FERYSTER Inductive Components Manufacturer
FERYSTER Inductive Comp...
LNK302 FERYSTER-LNK302 Datasheet
761Kb / 20P
   Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
Power Integrations, Inc.
Power Integrations, Inc...
LNK305GN POWERINT-LNK305GN Datasheet
717Kb / 20P
   Lowest Component Count, Energy-Effi cient Off-Line Switcher IC
LNK362GN-TL POWERINT-LNK362GN-TL Datasheet
789Kb / 16P
   LinkSwitch-XT Family Energy Effi cient, Low Power Off-Line Switcher IC
LNK302 POWERINT-LNK302_08 Datasheet
712Kb / 20P
   Lowest Component Count, Energy-Efficient Off-Line Switcher IC
LNK302 POWERINT-LNK302 Datasheet
867Kb / 16P
   Lowest Component Count, Energy Efficient Off-Line Switcher IC
LNK302DN-TL POWERINT-LNK302DN-TL Datasheet
1Mb / 18P
   Lowest Component Count, Energy-Efficient Off-Line Switcher IC
More results


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 


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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz