IC OFFLINE SWIT OCP 8SMD

LNK306G

Manufacturer Part NumberLNK306G
DescriptionIC OFFLINE SWIT OCP 8SMD
ManufacturerPower Integrations
SeriesLinkSwitch®-TN
LNK306G datasheet
 

Specifications of LNK306G

Output IsolationNon-IsolatedFrequency Range62 ~ 70kHz
Voltage - Output700VPower (watts)12mW
Operating Temperature-40°C ~ 150°CPackage / Case8-SMD Gull Wing, 7 Leads
Lead Free Status / RoHS StatusContains lead / RoHS non-compliant  
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LNK302/304-306
LinkSwitch-TN Family
Lowest Component Count, Energy-Effi cient
Off-Line Switcher IC
Product Highlights
Cost Effective Linear/Cap Dropper Replacement
• Lowest cost and component count buck converter solution
• Fully integrated auto-restart for short-circuit and open
loop fault protection – saves external component costs
• LNK302 uses a simplifi ed controller without auto-restart
for very low system cost
• 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 fi lter cost
• High thermal shutdown temperature (+135 °C minimum)
Much Higher Performance over Discrete Buck and
Passive Solutions
• Supports buck, buck-boost and fl yback topologies
• System level thermal overload, output short-circuit and
open control loop protection
• Excellent line and load regulation even with typical
confi guration
• 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 effi ciency than passive solutions
• Higher power factor than capacitor-fed solutions
• Entirely manufacturable in SMD
EcoSmart
®
– Extremely Energy Effi cient
• 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 fl yback topology
with external bias at 115/230 VAC input with no load
• Meets California Energy Commission (CEC), Energy
Star, and EU requirements
Applications
• Appliances and timers
• LED drivers and industrial controls
Description
LinkSwitch-TN is specifi cally 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 effi ciency.
®
Wide Range
HV DC Input
Figure 1. Typical Buck Converter Application (See Application
PRODUCT
LNK302P/G/D
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
Table 1. Output Current Table.
Notes:
1. Typical output current in a non-isolated buck converter. Output power
capability depends on respective output voltage. See Key Applications
Considerations Section for complete description of assumptions,
including fully discontinuous conduction mode (DCM) operation.
2. Mostly discontinuous conduction mode.
3. Continuous conduction mode.
4. Packages: P: DIP-8B, G: SMD-8B, D: SO-8C.
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
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 fl yback converters. The fully
integrated auto-restart circuit in the LNK304-306 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, if required.
FB
BP
D
S
+
LinkSwitch-TN
Examples Section for Other Circuit Confi gurations).
OUTPUT CURRENT TABLE
230 VAC ±15%
4
MDCM
2
CCM
3
MDCM
63 mA
80 mA
+
DC
Output
PI-3492-111903
1
85-265 VAC
2
CCM
3
63 mA
80 mA
November 2008

LNK306G Summary of contents

  • Page 1

    LNK302/304-306 LinkSwitch-TN Family Lowest Component Count, Energy-Effi cient Off-Line Switcher IC Product Highlights Cost Effective Linear/Cap Dropper Replacement • Lowest cost and component count buck converter solution • Fully integrated auto-restart for short-circuit and open loop fault protection – saves ...

  • Page 2

    LNK302/304-306 BYPASS (BP) 6.3 V FEEDBACK 1. (FB) Figure 2a. Functional Block Diagram (LNK302). BYPASS (BP) 6.3 V FEEDBACK 1. (FB) Figure 2b. Functional Block Diagram (LNK304-306). 2-2 2 Rev. I 11/08 BYPASS PIN ...

  • Page 3

    Pin Functional Description DRAIN (D) Pin: Power MOSFET drain connection. Provides internal operating current for both start-up and steady-state operation. BYPASS (BP) Pin: Connection point for a 0.1 μF external bypass capacitor for the internally generated 5.8 V supply. FEEDBACK ...

  • Page 4

    LNK302/304-306 600 500 V DRAIN 400 300 200 100 0 68 kHz 64 kHz 0 Time (μs) Figure 4. Frequency Jitter. power MOSFET is turned off for the remainder of that cycle. The leading edge blanking circuit inhibits the current ...

  • Page 5

    RF1 INPUT D4 Optimize hatched copper areas ( ) for heatsinking and EMI. Figure 6a. Recommended Printed Circuit Layout for LinkSwitch- Buck Converter Confi guration using Package. D3 RF1 AC C4 INPUT ...

  • Page 6

    LNK302/304-306 TOPOLOGY BASIC CIRCUIT SCHEMATIC High-Side Buck – Direct FB BP Feedback LinkSwitch- High-Side Buck – Optocoupler Feedback LinkSwitch- Low-Side + Buck – Optocoupler LinkSwitch-TN Feedback V IN ...

  • Page 7

    ... The typical inductance value and RMS current rating can be obtained from the LinkSwitch-TN design spreadsheet available within the PI Expert design suite from Power Integrations. Choose L1 greater than or equal to the typical calculated inductance with RMS current rating greater than or equal to calculated RMS inductor current ...

  • Page 8

    LNK302/304-306 Pre-load Resistor R4 In high-side, direct feedback designs where the minimum load is <3 mA, a pre-load resistor is required to maintain output regulation. This ensures suffi cient inductor energy to pull the inductor side of the feedback capacitor ...

  • Page 9

    DRAIN Voltage .................................. ................ -0 700 V Peak DRAIN Current (LNK302).................200 mA (375 mA) Peak DRAIN Current (LNK304).................400 mA (750 mA) Peak DRAIN Current (LNK305).................800 mA (1500 mA) Peak DRAIN Current (LNK306).................1400 mA (2600 mA) FEEDBACK Voltage .........................................-0.3 ...

  • Page 10

    LNK302/304-306 Parameter Symbol CONTROL FUNCTIONS (cont.) I CH1 BYPASS Pin Charge Current I CH2 BYPASS Pin V Voltage BP BYPASS Pin V Voltage Hysteresis BPH BYPASS Pin I Supply Current BPSC CIRCUIT PROTECTION I (See Current Limit LIMIT Note E) ...

  • Page 11

    Parameter Symbol CIRCUIT PROTECTION (cont.) Thermal Shutdown T Hysteresis SHD OUTPUT ON-State R Resistance DS(ON) OFF-State Drain I Leakage Current DSS Breakdown Voltage BV DSS t Rise Time R t Fall Time F DRAIN Supply Voltage Output Enable t Delay ...

  • Page 12

    LNK302/304-306 NOTES: A. Total current consumption is the sum of I switching) and the sum of I and Since the output MOSFET is switching diffi cult to isolate the switching current from the supply current ...

  • Page 13

    Typical Performance Characteristics 1.1 1.0 0.9 -50 - 100 125 150 Junction Temperature (°C) Figure 10. Breakdown vs. Temperature. 1.4 1.2 1.0 0.8 Normalized di/dt 0.6 0.4 0 Temperature (°C) Figure 12. ...

  • Page 14

    LNK302/304-306 Typical Performance Characteristics (cont.) PART ORDERING INFORMATION LNK 304 2-14 14 Rev. I 11/08 1000 100 Scaling Factors: LNK302 0.5 LNK304 1.0 LNK305 2.0 LNK306 3 100 200 300 400 500 Drain ...

  • Page 15

    D S .004 (.10) -E- .240 (6.10) .260 (6.60) Pin 1 .367 (9.32) -D- .387 (9.83) .125 (3.18) .145 (3.68) -T- SEATING PLANE .100 (2.54) BSC .048 (1.22) .053 (1.35) .014 (.36) ⊕ .010 (.25) ...

  • Page 16

    LNK302/304-306 B 4 4.90 (0.193) BSC 3.90 (0.154) BSC 0.10 (0.004 Pin 1 ID 1.27 (0.050) BSC 1.35 (0.053) 1.25 - 1.65 1.75 (0.069) (0.049 - 0.065) 0.10 (0.004) 0.25 (0.010) Reference Solder ...

  • Page 17

    LNK302/304-306 Notes 2-17 17 Rev. I 11/08 ...

  • Page 18

    LNK302/304-306 2-18 18 Rev. I 11/08 Notes ...

  • Page 19

    Revision Notes C 1) Released fi nal data sheet Corrected Minimum On Time Added LNK302 Added lead-free ordering information Minor error corrections. 2) Renamed Feedback Pin Voltage parameter to Feedback Pin Voltage ...

  • Page 20

    ... The products and applications illustrated herein (including transformer construction and circuits external to the products) may be covered by one or more U.S. and foreign patents, or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations patents may be found at www.powerint.com. Power Integrations grants its customers a license under certain patent rights as set forth at http://www ...