LNK501PN Power Integrations, LNK501PN Datasheet



Manufacturer Part Number
Power Integrations

Specifications of LNK501PN

Output Isolation
Frequency Range
26 ~ 46kHz
Voltage - Output
Power (watts)
Operating Temperature
-40°C ~ 150°C
Package / Case
8-DIP (0.300", 7.62mm), 7 Leads
Output Voltage
5.6 V
Input / Supply Voltage (max)
265 VAC
Input / Supply Voltage (min)
85 VAC
Duty Cycle (max)
80 %
Switching Frequency
42 KHz
Supply Current
1.06 mA
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
Through Hole
For Use With
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
Energy Efficient, CV/CC Switcher for
Very Low Cost Chargers and Adapters
Cost Effective Linear/RCC Replacement
Much Higher Performance Over Linear/RCC
• Consumes <300 mW at 265 VAC input with no load
• Meets California Energy Commission (CEC), Energy
• No current sense resistors – maximizes efficiency
• Linear transformer replacement in all ≤3 W applications
• Chargers for cell phones, cordless phones, PDAs, digital
• Home appliances, white goods and consumer electronics
• Constant output current LED lighting applications
• TV standby and other auxiliary supplies
LinkSwitch is specifically designed to replace all linear
transformer/RCC chargers and adapters in the ≤3 W universal
range at equal or lower system cost with much higher performance
and energy efficiency. LinkSwitch introduces a revolutionary
topology for the design of low power switching power supplies
Star, and EU requirements
cameras, MP3/portable audio devices, shavers, etc.
Lowest cost and component count, constant voltage,
constant current (CV/CC) solution
Extremely simple circuit configuration
Up to 75% lighter power supply reduces shipping cost
Primary based CV/CC solution eliminates 10 to 20
secondary components for low system cost
Combined primary clamp, feedback, IC supply, and loop
compensation functions – minimizes external components
Fully integrated auto-restart for short circuit and open
loop fault protection – saves external component costs
42 kHz operation simplifies EMI filter design
3 W output with EE13 core for low cost and small size
Universal input range allows worldwide operation
Up to 70% reduction in power dissipation – reduces
enclosure size significantly
CV/CC output characteristic without secondary feedback
System level thermal and current limit protection
Meets all single point failure requirements with only one
additional clamp capacitor
Controlled current in CC region provides inherent soft-start
Optional opto feedback improves output voltage accuracy
– Extremely Energy Efficient
Product Highlights
Figure 1. Typical Application – Not a Simplified Circuit (a) and
that rivals the simplicity and low cost of linear adapters, and
enables a much smaller, lighter, and attractive package when
compared with the traditional “brick.” With efficiency of up
to 75% at 3 W output and < 300 mW no-load consumption, a
LinkSwitch solution can save the end user enough energy
over a linear design to completely pay for the power supply
cost in less than one year. LinkSwitch integrates a 700 V power
MOSFET, PWM control, high voltage start-up, current limit,
and thermal shutdown circuitry, onto a monolithic IC.
Table 1. Notes: 1. Typical output power for designs in an enclosed
adapter measured at 50 °C ambient. 2. Uses higher reflected voltage
transformer designs for increased power capability – See Key
Application Considerations section. 3. For lead-free package options,
see Part Ordering Information.
LNK501P or G
*Estimated tolerance achievable in high volume production
**See Optional Secondary Feedback section.
including transformer and other component tolerances.
HV DC Input
Wide Range
Output Characteristic Tolerance Envelopes (b).
Shown Above
For Circuit
230 VAC
5.5 W
4 W
Secondary Feedback**
3.5 W
3 W
With Optional
February 2005
<500 mW
<300 mW

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LNK501PN Summary of contents

Page 1

LNK501 LinkSwitch Energy Efficient, CV/CC Switcher for Very Low Cost Chargers and Adapters Product Highlights Cost Effective Linear/RCC Replacement • Lowest cost and component count, constant voltage, constant current (CV/CC) solution • Extremely simple circuit configuration • 75% ...

Page 2

LNK501 CONTROL SHUNT REGULATOR/ ERROR AMPLIFIER - 5 OSCILLATOR D MAX CLOCK SAW I DCS R E Figure 2. Block Diagram. Pin Functional Description DRAIN (D) Pin: Power MOSFET drain connection. Provides ...

Page 3

LinkSwitch Functional Description The duty cycle, current limit and operating frequency relationships with CONTROL pin current are shown in Figure 4. Figure 5 shows a typical power supply outline schematic which is used below to describe the LinkSwitch operation. Power ...

Page 4

LNK501 The characteristics described above provide an approximate CV/CC power supply output without the need for secondary side voltage or current feedback. The output voltage regulation is influenced by how well the voltage across C2 tracks the reflected output voltage. ...

Page 5

D1, it would become a switching node, generating additional common mode EMI currents through its internal parasitic capacitance. The feedback configuration in Figure 6 is simply a resistive divider made ...

Page 6

LNK501 However, in laboratory bench tests often more convenient to test the power supply output characteristic starting from a low output current and gradually increasing the load. In this case, the optocoupler feedback regulates the output voltage until ...

Page 7

BR1 1 A, 600 V RF1 10 Ω Fusible C1 4.7 µF 85-265 400 V VAC Figure 9. 2.75 W Constant Voltage/Constant Current (CV/CC) Charger using LinkSwitch ...

Page 8

LNK501 3. A secondary output with a Schottky rectifier diode. 4. Assumed efficiency of 70%. 5. The part is board mounted with SOURCE pins soldered to sufficient area of copper to keep the die temperature at or ...

Page 9

At very light or no-load, typically less than output current, the output voltage rises due to leakage inductance peak charging of the secondary. This voltage rise can be reduced with a small preload with little change to ...

Page 10

... If this does not occur then the design should be refined to ensure the overall tolerance limits are met. Design Tools Up to date information on design tools can be found at the Power Integrations website: www.powerint.com LinkSwitch ...

Page 11

DRAIN Voltage .................................. ................ -0 700 V DRAIN Peak Current......................................400 mA CONTROL Voltage ................................................ -0 CONTROL Current (not to exceed 9 V)............100 mA Storage Temperature .......................................... -65 °C to 150 °C ..................... -40 °C ...

Page 12

LNK501 Parameter Symbol SHUTDOWN/AUTO-RESTART CONTROL Pin I Charging Current C(CH) I Control/Supply/ CD1 Discharge Current I CD2 Auto-Restart V Threshold Voltage C(AR) Auto-Restart V Hysteresis Voltage C(AR)hyst Auto-Restart Duty DC Cycle (AR) Auto-Restart f Frequency (AR) CIRCUIT PROTECTION Self-Protection I ...

Page 13

Parameter Symbol OUTPUT ON-State R Resistance DS(ON) OFF-State Drain I Leakage Current DSS Breakdown Voltage BV DSS DRAIN Supply Voltage NOTES: A. For specifications with negative values, a negative temperature coefficient corresponds to an increase in magnitude with increasing temperature, ...

Page 14

LNK501 Figure 12. LinkSwitch General Test Circuit 5. 1.6 1.2 0.8 0 DRAIN Voltage (V) Figure 13. I vs. DRAIN Voltage. C 120 100 ...

Page 15

Typical Performance Characteristics 1.1 1.0 0.9 -50 - 100 125 150 Junction Temperature (°C) Figure 17. Breakdown Voltage vs. Temperature. 1.200 1.000 0.800 0.600 0.400 0.200 0.000 -50 - 100 125 150 ...

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LNK501 Typical Performance Characteristics (cont 2/05 300 =25 °C T CASE =100 °C T 250 CASE 200 150 100 Drain Voltage (V) Figure 23. Output Characteristics (DRAIN Current vs. DRAIN Voltage). ...

Page 17

PART ORDERING INFORMATION LNK 501 ⊕ .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) ...

Page 18

LNK501 ⊕ .004 (.10) -E- .240 (6.10) .260 (6.60) Pin 1 .100 (2.54) (BSC) .367 (9.32) -D- .387 (9.83) .125 (3.18) .145 (3.68) .032 (.81) .048 (1.22) .037 (.94) .053 (1.35 2/05 SMD-8B .137 (3.48) MINIMUM ...

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Revision Notes D 1) Released Final Data Sheet Enhanced tolerance with optocoupler designs. 2) Updated P and G packages thermal impedance Corrected minor errors in text and figures. 2) Updated Figure 6 and text description. G ...

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... 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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