LNK306 Ver la hoja de datos (PDF) - Unspecified
Número de pieza
componentes Descripción
Fabricante
LNK306 Datasheet PDF : 20 Pages
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LNK302/304-306
TOPOLOGY
High-Side
Buck –
Direct
Feedback
BASIC CIRCUIT SCHEMATIC
FB BP
+
D
S
VIN
LinkSwitch-TN
VO
KEY FEATURES
1. Output referenced to input
2. Positive output (VO) with respect to -VIN
3. Step down – VO < VIN
4. Low cost direct feedback (±10% typ.)
High-Side
Buck –
Optocoupler
Feedback
Low-Side
Buck –
Optocoupler
Feedback
Low-Side
Buck –
Constant
Current LED
Driver
High-Side
Buck Boost –
Direct
Feedback
High-Side
Buck Boost –
Constant
Current LED
Driver
FB BP
+D
S
LinkSwitch-TN
VIN
+
LinkSwitch-TN
VIN
BP FB
S
D
+
LinkSwitch-TN
VIN
BP FB
S
D
PI-3751-121003
VO
PI-3752-121003
+
1. Output referenced to input
2. Positive output (VO) with respect to -VIN
3. Step down – VO < VIN
4. Optocoupler feedback
- Accuracy only limited by reference
choice
- Low cost non-safety rated opto
- No pre-load required
5. Minimum no-load consumption
VO
PI-3753-111903
IO
VF +
1. Output referenced to input
2. Negative output (VO) with respect to +VIN
3. Step down – VO < VIN
4. Optocoupler feedback
- Accuracy only limited by reference
choice
- Low cost non-safety rated opto
- No pre-load required
- Ideal for driving LEDs
R = VF PI-3754-112103
IO
FB BP
+
D
S
VIN
LinkSwitch-TN
VO
PI-3755-121003
FB BP
300 Ω
2 kΩ
RSENSE
2V
RSENSE = IO
IO
+D
S
LinkSwitch-TN
VIN
10 μF 100 nF
50 V
1. Output referenced to input
2. Negative output (VO) with respect to +VIN
3. Step up/down – VO > VIN or VO < VIN
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
PI-3779-120803
Table 2. Common Circuit Configurations Using LinkSwitch-TN. (continued on next page)
26-6
Rev. H 12/06
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