LNK302P POWERINT [Power Integrations, Inc.], LNK302P Datasheet

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LNK302P

Manufacturer Part Number
LNK302P
Description
Lowest Component Count, Energy Efficient Off-Line Switcher IC
Manufacturer
POWERINT [Power Integrations, Inc.]
Datasheet
1.LNK302P.pdf (16 pages)

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Cost Effective Linear/Cap Dropper Replacement
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Much Higher Performance over Discrete Buck and
Passive Solutions
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EcoSmart
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Applications
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Description
LinkSwitch-TN is specifically designed to replace all linear and
capacitor-fed (cap dropper) non-isolated power supplies in the
LNK302/304-306
LinkSwitch-TN Family
Lowest Component Count, Energy Efficient
Off-Line Switcher IC
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 simplified 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 filter cost
High thermal shutdown temperature (+135 °C minimum)
Supports buck, buck-boost and flyback topologies
System level thermal overload, output short-circuit and
open control loop protection
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
Entirely manufacturable in SMD
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 California Energy Commission (CEC), Energy
Star, and EU requirements
Appliances and timers
LED drivers and industrial controls
®
– Extremely Energy Efficient
Product Highlights
®
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
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 flyback 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
Table 1. 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.
For lead-free package options, see Part Ordering Information.
LNK302P or G
LNK304P or G 120 mA 170 mA 120 mA 170 mA
LNK305P or G 175 mA 280 mA 175 mA 280 mA
LNK306P or G 225 mA 360 mA 225 mA 360 mA
PRODUCT
HV DC Input
Wide Range
+
Examples Section for Other Circuit Configurations).
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
2
1
PI-3492-111903
March 2005
Output
80 mA
CCM
DC
+
3

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LNK302P Summary of contents

Page 1

... Wide Range HV DC Input Figure 1. Typical Buck Converter Application (See Application PRODUCT LNK302P or G LNK304P or G 120 mA 170 mA 120 mA 170 mA LNK305P or G 175 mA 280 mA 175 mA 280 mA LNK306P or G 225 mA 360 mA 225 mA 360 mA Table 1. Notes: 1. Typical output current in a non-isolated buck converter ...

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) T Figure 2b. Functional Block Diagram (LNK304-306 3/05 BYPASS PIN UNDER-VOLTAGE + ...

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 6. Recommended Printed Circuit Layout for LinkSwitch- Buck Converter Configuration. cycles are skipped. To provide overload protection if no cycles are ...

Page 6

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

Page 7

TOPOLOGY BASIC CIRCUIT SCHEMATIC Low-Side Buck Boost – Optocoupler + Feedback LinkSwitch- Table 2 (cont). Common Circuit Configurations Using LinkSwitch-TN. leading edge current spikes, terminating the switching cycle prematurely and preventing full power delivery. Fast and ...

Page 8

LNK302/304-306 be included for better EMI performance and higher line surge withstand capability. Quick Design Checklist As with any power supply design, all LinkSwitch-TN designs should be verified for proper functionality on the bench. The following minimum tests are recommended: ...

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.) Leading Edge t Blanking Time LEB Thermal Shutdown T Temperature SD Thermal Shutdown T Hysteresis SHD OUTPUT ON-State R Resistance DS(ON) OFF-State Drain I Leakage Current DSS Breakdown Voltage BV DSS Rise Time t R ...

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 difficult to isolate the switching current from the supply current at ...

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 3/05 1000 100 Scaling Factors: LNK302 0.5 LNK304 1.0 LNK305 2.0 LNK306 3 100 200 300 400 500 Drain Voltage (V) ...

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 Revision Notes C 1) Released Final 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 ...

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