lnk501 Power Integrations, Inc., lnk501 Datasheet

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lnk501

Manufacturer Part Number
lnk501
Description
Energy Ef?cient, Cv/cc Switcher For Very Low Cost Chargers And Adapters
Manufacturer
Power Integrations, Inc.
Datasheet

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LNK501
LinkSwitch
Energy Efficient, CV/CC Switcher for
Very Low Cost Chargers and Adapters
Cost Effective Linear/RCC Replacement
Much Higher Performance Over Linear/RCC
EcoSmart
• Consumes <300 mW at 265 VAC input with no load
• Meets California Energy Commission (CEC), Energy
• No current sense resistors – maximizes efficiency
Applications
• 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
Description
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
®
Family
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.
PRODUCT
LNK501P or G
V
O
*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
OUTPUT POWER TABLE
3
LinkSwitch
±20%*
D
C
230 VAC
±15%
5.5 W
S
4 W
±10%
I
O
(a)
(b)
V
O
Secondary Feedback**
85-265
3.5 W
±5%
VAC
3 W
With Optional
±20%*
February 2005
1
PI-2776-022603
<500 mW
<300 mW
No-Load
Output
Power
(V
DC
Input
O
)
I
O
2

lnk501 Summary of contents

Page 1

... Optional Secondary Feedback section. Figure 1. Typical Application – Not a Simplified Circuit (a) and PRODUCT LNK501P or G 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 ...

Page 2

... V - 4.7 V HYSTERETIC THERMAL SHUTDOWN COMPARATOR LOW FREQUENCY OPERATION Figure 3. Pin Configuration. DRAIN CURRENT LIMIT ADJUST CURRENT LIMIT COMPARATOR - + LEADING EDGE EDGE BLANKING SOURCE PI-2777-032503 LNK501 Package (DIP-8B) G Package (SMD-8B) PI-2711-073107 ...

Page 3

... I 3.8% LIM C characteristic C Frequency f OSC that depends on power f OSC(low the desired value Figure 4. CONTROL Characteristics Figure 5. Power Supply Outline Schematic. LNK501 Auto-restart CONTROL Current I C Auto-restart I I CD1 DCS CONTROL Current I C Auto-restart CONTROL Current I C PI-2799-112102 LinkSwitch ...

Page 4

... U1 current and VR1 slope resistance should be consulted to determine whether R5 is required arranged with collector connected to primary ground and emitter to the anode of D1. This connection keeps the opto in an electrically “quiet” position in the circuit. If the opto was LinkSwitch D S LNK501 ...

Page 5

... Tolerance envelope Inherent without optocoupler transition point characteristic without V O(MAX) Characteristic with Power supply peak output power curve Characteristic observed with load variation often applied during laboratory bench testing Output Current LNK501 Typical inherent optocoupler optocoupler PI-2790-112102 5 I 2/05 ...

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 the peak output power curve is reached as shown in Figure 8. ...

Page 7

... V 116 T #34 AWG C4 R1 0.1 µF 20.5 kΩ 100 4.7 µF 400 2.55 mH 1N4937 R2 100 Ω 200 300 400 Output Current (mA) LNK501 5 500 #30 AWG 470 µF TIW RTN D6 11DQ06 EE13 PERFORMANCE SUMMARY Output Power: 2.75 W ≥ ...

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 below 100 ° output cable with a total resistance of 0.2 Ω. In addition to the thermal environment (sealed enclosure, ...

Page 9

... Maximum drain current – At maximum ambient temperature, maximum input voltage and peak output power, verify drain current waveforms at start-up for any signs of transformer saturation and excessive leading edge current spikes. LinkSwitch has a minimum leading edge blanking time of LNK501 requires a diode PIV of 50 V). OR does not exceed DS ...

Page 10

... LNK501 200 ns to prevent premature termination of the on-cycle. Verify that the leading edge current spike event is below current limit at the end of the 200 ns blanking period. 3. Thermal check – At peak output power, minimum input voltage and maximum ambient temperature, verify that the temperature specifi ...

Page 11

... Frequency = °C OSC(LOW 1 °C C DCT °C J See Figure DCT °C C DCT J LNK501 (1, ° oz. (610 g/m ) copper clad oz. (610 g/m ) copper clad Min Typ Max 2.4 3.8 5.2 1.8 3.15 4 ...

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 Current Limit LIM I f Coefficient Current Limit at I Auto-Restart LIM(AR) ...

Page 13

... ° See Note E specification by ramping the DRAIN pin voltage up to but not DSS to correlate to power supply output current (it is multiplied vs. DRAIN voltage (Figure 13) for low voltage operation characteristics. C LNK501 Min Typ Max Units 28 32 Ω µ ...

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 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 CONTROL Pin Voltage (V) Figure 15. CONTROL Pin I-V Characteristic 2/05 750 Ω 10 kΩ 0.22 µF 80 100 Figure 14. Duty Cycle Measurement. ...

Page 15

... Figure 19. Current Limit vs. Temperature. 1.200 1.000 0.800 0.600 0.400 0.200 0.000 - Junction Temperature (°C) Figure 21. I vs. Temperature. DCT Figure 18. Switching Frequency vs. Temperature. Figure 20. I 100 150 Figure 22. PWM Gain vs. Temperature. LNK501 1.200 1.000 0.800 0.600 0.400 0.200 0.000 - 100 Junction Temperature (°C) 1.2 1.0 0.8 0.6 0.4 0.2 0.0 ...

Page 16

... 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). 10 ...

Page 17

... Minimum metal to metal spacing at the package body for the omitted lead location is .137 inch (3.48 mm). 6. Lead width measured at package body. 7. Lead spacing measured with the leads constrained to be .057 (1.45) perpendicular to plane T. .068 (1.73) (NOTE 6) .015 (.38) MINIMUM .008 (.20) .120 (3.05) .015 (.38) .140 (3.56) .300 (7.62) BSC (NOTE 7) .300 (7.62) .390 (9.91) LNK501 P08B PI-2551-121504 17 I 2/05 ...

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 .372 (9.45) .388 (9.86) ⊕ .010 (.25 .046 .060 Pin 1 .086 .186 Solder Pad Dimensions .057 (1.45) .068 (1.73) (NOTE 5) .004 (.10) .009 (.23) ...

Page 19

... Corrected minor errors in text and figures. 2) Updated Figure 6 and text description Updated DIP-8B and SMD-8B package descriptions. 2) Updated Table 1 with no-load conditions. 3) Corrected minor errors in text and figures Added lead-free ordering information Minor error and formatting corrections. LNK501 Date 7/02 8/02 9/02 4/03 12/04 2/ ...

Page 20

... LNK501 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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