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參數(shù)資料
| 型號(hào)： | AN-37 |
| 英文描述： | LinkSwitch-TN Design Guide |
| 中文描述： | 的LinkSwitch - TN設(shè)計(jì)指南 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 155K |
| 代理商： | AN-37 |
AN-37
2
A
1/04
Table 1. LinkSwitch-TN Circuit Configurations Using Directly Sensed Feedback.
TOPOLOGY
BASIC CIRCUIT SCHEMATIC
KEY FEATURES
High-Side
Buck –
Direct
Feedback
1) Output referenced to input
2) Positive output (V
) with respect to -V
IN
3) Step down – V
< V
4) Low cost direct feedback (
±
10% typ.)
High-Side
Buck Boost –
Direct
Feedback
1) Output referenced to input
2) Negative output (V
O
) with respect to -V
IN
3) Step down – V
> V
or V
O
< V
4) Low cost direct feedback (
±
10% typ.)
5) Fail-safe – output is not subjected to input
voltage if the internal MOSFET fails
6) Ideal for driving LEDs – better accuracy and
temperature stability than low-side Buck
constant current LED driver
V
O
V
IN
PI-3751-121003
+
+
FB
BP
S
D
LinkSwitch-TN
document describes the design procedure for buck and buck-
boost converters using the
LinkSwitch-TN
family of integrated
off-line switchers. The objective of this document is to provide
power supply engineers with guidelines in order to enable them
to quickly build efficient and low cost buck or buck-boost
converter based power supplies using low cost off-the-shelf
inductors. Complete design equations are provided for the
selection of the converter’s key components. Since the power
MOSFET and controller are integrated into a single IC the
design process is greatly simplified, the circuit configuration
has few parts and no transformer is required. Therefore a quick
start section is provided that allows off-the-shelf components to
be selected for common output voltages and currents.
In addition to this application note a design spreadsheet is
available within the PIXls tool in the
PI Expert
design software
suite. The reader may also find the
LinkSwitch-TN
DAK
engineering prototype board useful as an example of a working
supply. Further details of support tools and updates to this
document can be found at www.powerint.com.
Quick Start
Readers wanting to start immediately can use the following
information to quickly select the components for a new design,
using Figure 1 and Tables 1 and 2 as references.
1) For AC input designs select the input stage (Table 9).
2) Select the topology (Tables 1 and 2).
- If better than
±
10% output regulation is required,
then use opto coupler feedback with suitable reference.
3) Select the
LinkSwitch-TN
device, L, R
FB
or V
Z
, R
BIAS
, C
FB
,
R
and the reverse recovery time for D
FW
(Table 3: Buck, table 4:Buck-Boost).
4) Select freewheeling diode to meet t
rr
determined in step 3
(Table 5).
5) For direct feedback designs, if the minimum load < 3 mA
then calculate R
PL
= V
/ 3 mA.
6) Select C
as 100
μ
F, 1.25
V
, low ESR type.
7) Construct prototype and verify design.
Notes
1. Low cost, directly sensed feedback typically achieves overall regulation tolerance of
±
10%.
2. To ensure output regulation a pre-load may be required to maintain a minimum load current of 3 mA (Buck and Buck-Boost only).
3. Boost topology (step up) also possible but not shown.
V
O
+
V
IN
PI-3794-121503
+
FB
BP
S
D
LinkSwitch-TN
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