Typical Buck Converter Application
Description:
- Lowest cost and component count buck converter solution
- Tight tolerances and negligible temperature variation
- System level thermal overload, output short-circuit and open loop protection
- Supports buck, buck-boost and flyback topologies
- Excellent line and load regulation even with typical configuration
- High bandwidth provides fast turn-on with no overshoot
- Current limit operation rejects line ripple
- Universal input voltage range (85 VAC to 265 VAC)
- Built-in current limit and hysteretic thermal protection
- Higher efficiency than passive solutions
- Higher power factor than capacitor-fed solutions
- Enables a 100% SMD designed power supply
Applications:
- Non-isolated buck or buck-boost converter solution for linear/passive dropper replacement
- Major and small home appliances
- Industrial controls
- Utility meters
- Constant current LED lighting
- Timers
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|
| Output Current Table |
| PRODUCT(1) |
230 VAC ±15% |
85-265 VAC |
| MDCM(2) |
CCM(3) |
MDCM(2) |
CCM(3) |
| LNK302P/G/D |
63 mA |
80 mA |
63 mA |
80 mA |
| LNK304P/G/D |
120 mA |
170 mA |
120 mA |
170 mA |
| LNK305P/G/D |
175 mA |
280 mA |
175 mA |
280 mA |
| LNK306P/G/D |
225 mA |
360 mA |
225 mA |
360 mA |
| Data Sheet |
| LNK302/304-306 |
 |
| Reference Design |
Description |
RDKs include a working power supply, sample devices, unpopulated
pcb, data sheet, comprehensive engineering report, PI
Expert design software and other related documentation. |
| RDK-131 |
- LED bulb retrofit
- LNK302, 304, 305 and 306 samples (P, G, and D packages)
- Unpopulated prototype board
- LinkSwitch-TN data sheet
- Engineering report
- Design guide
- PI Expert power supply design software CD-ROM
|
| Design Ideas |
| DI-131 |
LED Driver for Halogen Light Bulb Retrofit
Extremely small form factor, fits within GU10 lamp base
• Operates over the universal input voltage range (90 – 265 VAC)
• Meets EN55022 B conducted EMI requirements
• Drives LEDs in constant current (CC) mode
• Built-in, output overvoltage protection when unloaded
• Allows supply to be tested without the load connected
• Low parts count, low-cost solution: only 25 components
• Non-isolated buck converter configuration allows use of off-the-shelf inductors
(does not require a custom transformer) |
| DI-92 |
LED Driver Design
Off-Line, low component count,
cost-effective circuit
VIN = 85 VAC to 265 VAC
Output = 0.5 W, 40 mA constant current |
| Lead (Pb)-Free Finish Options |
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|
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Consumes typically only 50/80 mW in self-powered buck topology at 115/230 VAC input with no load (opto feedback)
-
 Consumes typically only 7/12 mW in flyback topology with external bias at 115/230 VAC input with no load
-
Meets Blue Angel, Energy Star and EU requirements
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