lnk302 Power Integrations, Inc., lnk302 Datasheet

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lnk302

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

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LNK302/304-306
LinkSwitch-TN Family
Lowest Component Count, Energy-Effi cient
Off-Line Switcher IC
Cost Effective Linear/Cap Dropper Replacement
• Lowest cost and component count buck converter solution
• Fully integrated auto-restart for short-circuit and open
• LNK302 uses a simplifi ed controller without auto-restart
• 66 kHz operation with accurate current limit – allows low cost
• Tight tolerances and negligible temperature variation
• High breakdown voltage of 700 V provides excellent
• Frequency jittering dramatically reduces EMI (~10 dB)
• 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
• Excellent line and load regulation even with typical
• 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
• Consumes typically only 50/80 mW in self-powered buck
• Consumes typically only 7/12 mW in fl yback topology
• Meets California Energy Commission (CEC), Energy
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.
loop fault protection – saves external component costs
for very low system cost
off-the-shelf 1 mH inductor for up to 120 mA output current
input surge withstand
– minimizes EMI fi lter cost
open control loop protection
confi guration
topology at 115/230 VAC input with no load (opto feedback)
with external bias at 115/230 VAC input with no load
Star, and EU requirements
®
– Extremely Energy Effi cient
Product Highlights
®
Table 1. Output Current Table.
Notes:
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.
Figure 1. Typical Buck Converter Application (See Application
1. Typical output current in a non-isolated buck converter. Output power
2. Mostly discontinuous conduction mode.
3. Continuous conduction mode.
4. Packages: P: DIP-8B, G: SMD-8B, D: SO-8C.
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
PRODUCT
HV DC Input
Wide Range
capability depends on respective output voltage. See Key Applications
Considerations Section for complete description of assumptions,
including fully discontinuous conduction mode (DCM) operation.
+
Examples Section for Other Circuit Confi gurations).
OUTPUT CURRENT TABLE
4
LinkSwitch-TN
D
FB
MDCM
63 mA
230 VAC ±15%
BP
S
2
80 mA
CCM
3
MDCM
63 mA
85-265 VAC
1
December 2006
2
PI-3492-111903
Output
80 mA
CCM
DC
+
3

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lnk302 Summary of contents

Page 1

... 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 • ...

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. H 12/06 BYPASS PIN UNDER-VOLTAGE + 5 4.85 V JITTER CLOCK DC MAX THERMAL SHUTDOWN OSCILLATOR FAULT PRESENT AUTO- RESTART BYPASS PIN COUNTER ...

Page 3

... When the die temperature rises above this threshold (142 °C) the power MOSFET is disabled and remains disabled until the die temperature falls by 75 °C, at which point it is re-enabled. Current Limit The current limit circuit senses the current in the power MOSFET. When this current exceeds the internal threshold (I LNK302/304-306 ), the LIMIT 2-3 3 Rev. H 12/06 ...

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 limit comparator for a short time (t ) after the power MOSFET LEB is turned on ...

Page 5

... LinkSwitch-TN Selection and Selection Between MDCM and CCM Operation Select the LinkSwitch-TN device, freewheeling diode and output inductor that gives the lowest overall cost. In general, MDCM LNK302/304-306 ...

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 Low-Side + Buck – Constant LinkSwitch-TN Current LED V IN Driver BP S High-Side Buck Boost – ...

Page 7

... Capacitor C3 can be a low cost general purpose capacitor. It provides a “sample and hold” function, charging to the output voltage during the off time of LinkSwitch-TN. Its value should be 10 μ μF; smaller values cause poorer regulation at light load conditions. LNK302/304-306 KEY FEATURES 1. Output referenced to input 2. Positive output (V ) with respect Step up/down – ...

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 C3 to input return via D2. The value of R4 should be selected to give a minimum output load ...

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 FEEDBACK Current.............................................100 mA BYPASS Voltage ..........................................-0 Storage Temperature .......................................... -65 °C to 150 °C ..................... -40 ° ...

Page 10

... T J di/ mA/μ ° LNK304 di/dt = 415 mA/μ ° di/ mA/μ ° LNK305 di/dt = 500 mA/μ ° di/ mA/μ ° LNK306 di/dt = 610 mA/μ ° LNK302/304 LNK305 LNK306 = 25 ° See Note F Min Typ Max Units -5.5 -3.3 -1.8 -7.5 -4.6 -2.5 mA -3.8 -2.3 -1.0 -4.5 -3.3 -1.5 5.55 5.8 6.10 V 0.8 0.95 1 ...

Page 11

... LNK305 V = 560 °C T LNK306 6 ≥ ° Measured in a Typical Buck Converter Application See Figure 9 LNK302 = 25 ° See Note H LNK304-306 LNK302 LNK304-306 LNK302/304-306 Min Typ Max Units ° 55.2 76 88.4 24 27.6 38 44.2 Ω 12 13.8 19 22.1 7 8.1 11 12.9 50 μ ...

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 at the DRAIN. An alternative is to measure the BYPASS pin current ...

Page 13

... Limit = 1 LNK302 55 mA/μs 136 mA LNK304 65 mA/μs 257 mA 0.4 LNK305 75 mA/μs 375 mA LNK306 95 mA/μs 482 mA 0 Normalized di/dt 25 °C 100 °C Scaling Factors: LNK302 0.5 LNK304 1.0 LNK305 2.0 50 LNK306 3 DRAIN Voltage (V) 6 2-13 13 Rev. H 12/06 ...

Page 14

... LNK302/304-306 Typical Performance Characteristics (cont.) PART ORDERING INFORMATION LNK 304 2-14 14 Rev. H 12/06 1000 100 Scaling Factors: LNK302 0.5 LNK304 1.0 LNK305 2.0 LNK306 3 100 200 300 400 500 Drain Voltage (V) Figure 16. C vs. Drain Voltage. OSS LinkSwitch Product Family TN Series Number Package Identifi er ...

Page 15

... Solder Pad Dimensions .057 (1.45) .068 (1.73) (NOTE 5) .004 (.10) .009 (.23) .004 (.10) .036 (0.91) .012 (.30) .044 (1.12) LNK302/304-306 (NOTE 7) PI-2551-121504 Notes: 1. Controlling dimensions are inches. Millimeter sizes are shown in parentheses. 2. Dimensions shown do not include mold flash or other protrusions. Mold flash or protrusions shall not exceed .006 (.15) on any side. ...

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 Pad Dimensions 2.00 (0.079 1.27 (0.050) D07C 2-16 16 Rev. H 12/06 SO-8C 0.10 (0.004 SEATING PLANE 6.00 (0.236) BSC 4 0.20 (0.008 0.31 - 0.51 (0.012 - 0.020) 0.25 (0.010 A-B D ...

Page 17

... LNK302/304-306 Notes 2-17 17 Rev. H 12/06 ...

Page 18

... LNK302/304-306 2-18 18 Rev. H 12/06 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 at Turnoff Threshold and removed condition Added SO-8C package. LNK302/304-306 ...

Page 20

... LNK302/304-306 For the latest updates, visit our website: www.powerint.com Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein. POWER INTEGRATIONS MAKES NO WARRANTY HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS ...

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