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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)： | 3/16頁 |
| 文件大?。?/td> | 155K |
| 代理商： | AN-37 |
AN-37
3
A
1/04
Table 2. LinkSwitch-TN Circuit Configurations Using Optocoupler Feedback.
TOPOLOGY
BASIC CIRCUIT SCHEMATIC
KEY FEATURES
High-Side
Buck –
Optocoupler
Feedback
1) Output referenced to input
2) Positive output (V
) with respect to -V
IN
3) Step down – V
< V
4) Optocoupler feedback
- Accuracy only limited by reference choice
- Low cost non-safety rated optocoupler
- No pre-load required
5) Minimum no-load consumption
Low-Side
Buck –
Optocoupler
Feedback
1) Output referenced to input
2) Negative output (V
O
) with respect to +V
IN
3) Step down – V
< V
4) Optocoupler feedback
- Accuracy only limited by reference choice
- Low cost non-safety rated optocoupler
- No pre-load required
LinkSwitch-TN
PI-3796-121903
+
+
BP
FB
D
S
V
O
V
Z
R
Z
V
IN
LinkSwitch-TN
PI-3797-121903
+
+
BP
FB
D
S
V
O
V
IN
V
Z
R
Z
Low-Side
Buck Boost –
Optocoupler
Feedback
1) Output referenced to input
2) Positive output (V
O
) with respect to +V
IN
3) Step up/down – V
> V
IN
or V
O
< V
IN
4) Optocoupler feedback
- Accuracy only limited by reference choice
- Low cost non-safety rated optocoupler
- No pre-load required
5) Fail-safe – output is not subjected to input
voltage if the internal MOSFET fails
6) Minimum no-load consumption
LinkSwitch-TN
PI-3798-121903
+
BP
FB
D
S
V
O
V
IN
+
V
Z
R
Z
Notes
1. Performance of opto feedback only limited by accuracy of reference (Zener or IC).
2. Optocoupler does not need to be safety approved.
3. Reference bias current provides minimum load. The value of R
Z
is determined by Zener test current or reference IC bias current.
Typically 470
to 2 k
, 1/8 W, 5%
4. Boost topology (step-up) is also possible but not shown.
5. Optocoupler feedback provides lowest no-load consumption.
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