lnk302 Power Integrations, Inc., lnk302 Datasheet - Page 6

• Manufacturer Part Number: lnk302
• Description: Lowest Component Count, Energy-ef?cient Off-line Switcher Ic
• Manufacturer: Power Integrations, Inc.

Table 2. Common Circuit Confi gurations Using LinkSwitch-TN. (continued on next page)
Rev. H 12/06
High-Side
Buck –
Direct
Feedback
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
2-6
TOPOLOGY
6
LNK302/304-306
V
+
IN
V
V
V
V
V
+
+
+
+
+
IN
IN
IN
IN
IN
D
LinkSwitch-TN
FB
LinkSwitch-TN
LinkSwitch-TN
BASIC CIRCUIT SCHEMATIC
D
FB
LinkSwitch-TN
D
D
FB
FB
LinkSwitch-TN
LinkSwitch-TN
BP
S
BP
S
S
BP
BP
S
BP
BP
S
S
FB
FB
D
D
2 kΩ
300 Ω
R
10 μF
50 V
SENSE
100 nF
R =
V
R
F
V
I
SENSE
+
O
F
I
O
PI-3755-121003
PI-3753-111903
PI-3751-121003
PI-3752-121003
PI-3754-112103
=
PI-3779-120803
2 V
I
O
I
O
V
V
V
+
V
+
+
+
O
O
O
O
1. Output referenced to input
2. Positive output (V
3. Step down – V
4. Low cost direct feedback (±10% typ.)
1. Output referenced to input
2. Positive output (V
3. Step down – V
4. Optocoupler feedback
5. Minimum no-load consumption
1. Output referenced to input
2. Negative output (V
3. Step down – V
4. Optocoupler feedback
1. Output referenced to input
2. Negative output (V
3. Step up/down – V
4. Low cost direct feedback (±10% typ.)
5. Fail-safe – output is not subjected to input
6. Ideal for driving LEDs – better accuracy
- Accuracy only limited by reference
- Low cost non-safety rated opto
- No pre-load required
- Accuracy only limited by reference
- Low cost non-safety rated opto
- No pre-load required
- Ideal for driving LEDs
voltage if the internal MOSFET fails
and temperature stability than Low-side
Buck constant current LED driver
choice
choice
KEY FEATURES
O
O
O
< V
< V
< V
O
O
O
) with respect to -V
) with respect to -V
O
O
> V
) with respect to +V
) with respect to +V
IN
IN
IN
IN
or V
O
< V
IN
IN
IN
IN
IN