Datasheet LNK3202, LNK3204-7, LNK3294, LNK3296 (Power Integrations) - 7

LinkSwitch-TN2 Topology Basic Circuit Schematic Key Features
1. Output referenced to input High-Side 2. Positive output (V ) with respect to -V O IN Buck –
FB BP/M
3. Step down – V < V O IN Direct +
D S
+ 4. Low cost direct feedback (±10% typ.) Feedback
LinkSwitch-TN2
5. Requires an output load to maintain regulation
VIN VO
PI-7843-031616 1. Output referenced to input
FB BP/M
2. Positive output (V ) with respect to -V O IN High-Side
D S
3. Step down – V < V + + O IN Buck –
LinkSwitch-TN2
4. Optocoupler feedback Optocoupler - Accuracy only limited by reference choice Feedback
V V IN O
- Low cost non-safety rated optocoupler - No pre-load required 5. Minimum no-load consumption PI-7844-031616 + + Low-Side
LinkSwitch-TN2
Buck –
V V IN O
Optocoupler Feedback
BP/M FB
1. Output referenced to input
S D
PI-7845-031616 2. Negative output (V ) with respect to +V O IN 3. Step down – V < V O IN 4. Optocoupler feedback + IO - Accuracy only limited by reference choice - Low cost non-safety rated optocoupler Low-Side
LinkSwitch-TN2
- No pre-load required Buck –
V
V
IN
F + - Ideal for driving LEDs Constant Current LED Driver
BP/M FB S D
VF PI-7846-031616 R = IO High-Side Buck-Boost –
FB BP/M
Direct
D S
Feedback + 1. Output referenced to input
V LinkSwitch-TN2 V IN O
2. Negative output (V ) with respect to +V O IN + 3. Step up/down – V > V or V < V O IN O IN 4. Low cost direct feedback (±10% typ.) PI-7847-031616 5. Fail-safe – output is not subjected to input voltage if the internal power MOSFET fails 300 2 V Ω RSENSE = 6. Ideal for driving LEDs – better accuracy and IO High-Side 2 kΩ temperature stability than low-side buck
FB BP/M
R Buck-Boost – SENSE IO constant current LED driver Constant +
D S
7. Requires an output load to maintain regulation Current LED
LinkSwitch-TN2 V
10 µF
IN
100 nF Driver 50 V PI-7849-031616 Table 2. Common Circuit Configurations using LinkSwitch-TN2. (continued on next page)
7
Rev. M 10/20 www.power.com Document Outline Product Highlights Description Output Current Table Pin Functional Description LinkSwitch-TN2 Functional Description Applications Example Key Application Considerations Quick Design Checklist Absolute Maximum Ratings Thermal Resistance Key Electrical Characteristics Typical Performance Characteristics PDIP-8C (P Package) SMD-8C (G Package) SO-8C (D Package) PDIP-8C (P) and SMD-8C Package Marking SO-8C (D) Package Marking MSL Table ESD and Latch-Up Part Ordering Information