LNK305PN IC – Power Integrations – AC-DC Off Line Switcher IC

The LNK305PN is specifically designed to replace all linear and capacitor-fed (cap dropper) non-isolated power supplies in the under 360 mA output current range at equal system cost while offering much higher performance and energy efficiency. LinkSwitch-TN devices integrate a 700 V power MOSFET, oscillator, simple On/Off control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit Figure 1. Typical Buck Converter Application (See Application Examples Section    for Other Circuit Configurations).and thermal shutdown circuitry onto a monolithic IC. The start-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias supply and associated circuitry in buck or fly back converters. The fully integrated auto-restart circuit in the LNK305 safely limits output power during fault conditions such as short-circuit or open loop, reducing component count and system-level load protection cost.  A local supply provided by the IC allows use of a non-safety graded optocoupler acting as a level shifter to further enhance line and load regulation performance in buck and buck-boost converters.

SKU: RW-02148

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Description

The LNK305PN is specifically designed to replace all linear and capacitor-fed (cap dropper) non-isolated power supplies in the under 360 mA output current range at equal system cost while offering much higher performance and energy efficiency. LinkSwitch-TN devices integrate a 700 V power MOSFET, oscillator, simple On/Off control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit Figure 1. Typical Buck Converter Application (See Application Examples Section    for Other Circuit Configurations).and thermal shutdown circuitry onto a monolithic IC. The start-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias supply and associated circuitry in buck or fly back converters. The fully integrated auto-restart circuit in the LNK305 safely limits output power during fault conditions such as short-circuit or open loop, reducing component count and system-level load protection cost.  A local supply provided by the IC allows use of a non-safety graded optocoupler acting as a level shifter to further enhance line and load regulation performance in buck and buck-boost converters.

Features:-

? Lowest cost and component count buck converter solution

? Fully integrated auto-restart for short-circuit and open loop fault protection ? saves external component costs

? 66 kHz operation with accurate current limit ? allows low cost off-the-shelf 1 mH inductor for up to 120 mA output current

? Tight tolerances and negligible temperature variation

? High breakdown voltage of 700 V provides excellent input surge withstand

? Frequency jittering dramatically reduces EMI (~10 dB) 

?  Minimizes EMI filter cost

? High thermal shutdown temperature (+135 ?C minimum)


Specification:-

Symbol Parameter Min Type Max Units
VBP BYPASS Pin Voltage 5.55 5.8 6.10 V
VBPH BYPASS Pin Voltage Hysteresis 0.8 0.95 1.2 V
tON(MIN) Minimum On Time 280 360 475 ns
tLEB Leading Edge Blanking Time 170 215 ns
TSD Thermal Shutdown Temperature 135 142 150 ?C
TSHD Thermal Shutdown Hysteresis 75 ?C


Related Document:-

 LNK305PN IC Data Sheet 

Additional information

Operating voltage

2.5 3.0V

Pixel Resolution

0.3MP

Photosensitive array

640 x 480

Optical Size

1.6 inch

Angel of view

67 degrees

Maximum Frame Rate

30fps VGA

Sensitivity

1.3V/(Lux-sec)

Dormancy

Less than 20A

Power consumption

60mW/15fpsVGA YUV

Temperature operation Range

-30 C ~ 70 C

Pixel area

3.6 x 3.6 m

Signal to noise ratio (SNR)

46 dB

Dynamic range

52 dB

Specification

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