lnk500 Power Integrations, Inc., lnk500 Datasheet

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lnk500

Manufacturer Part Number
lnk500
Description
Energy Ef?cient, Cv Or Cv/cc Switcher For Very Low Cost Adapters And Chargers
Manufacturer
Power Integrations, Inc.
Datasheet

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LNK500
LinkSwitch
Energy Efficient, CV or CV/CC Switcher for
Very Low Cost Adapters and Chargers
Cost Effective Linear/RCC Replacement
• Lowest cost and component count, constant voltage (CV)
• Extremely simple circuit configuration
• Up to 75% lighter power supply reduces shipping cost
• Primary based CV/CC solution eliminates 10 to 20 secondary
• Combined primary clamp, feedback, IC supply, and loop
• Fully integrated auto-restart for short circuit and open loop
• 42 kHz operation simplifies EMI filter design
Much Higher Performance Over Linear/RCC
• Universal input range allows worldwide operation
• Up to 70% reduction in power dissipation – reduces enclosure
• CV/CC output characteristic without secondary feedback
• System level thermal and current limit protection
• Meets all single point failure requirements with only one
• Controlled current in CC region provides inherent soft-start
• Optional opto feedback improves output voltage accuracy
EcoSmart
• Consumes <300 mW at 265 VAC input with no load
• Meets California Energy Commission (CEC), Energy Star,
• 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 low power linear
transformer/RCC chargers and adapters at equal or lower system
cost with much higher performance and energy efficiency.
LNK500 is a lower cost version of the LNK501 with a wider
tolerance output CC characteristic. LinkSwitch introduces a
revolutionary patented topology for the design of low power
switching power supplies that rivals the simplicity and low
or constant voltage/constant current (CV/CC) solution
components for low system cost
compensation functions – minimizes external components
fault protection – saves external component costs
size significantly
additional clamp capacitor
and EU requirements
cameras, MP3/portable audio devices, shavers, etc.
®
– Extremely Energy Efficient
Product Highlights
®
Family
Table 1. Notes: 1. Output power for designs in an enclosed adapter
measured at 50 °C ambient. 2. See Figure 1 (b) for Min (CV only
designs) and Typ (CV/CC charger designs) power points identified
on output characteristic. 3. Uses higher reflected voltage transformer
designs for increased power capability – see Key Application
Considerations section. 4. For lead-free package options, see Part
Ordering Information.
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% 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 full 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.
Figure 1. Typical Application – Not a Simplified Circuit (a) and
PRODUCT
V
O
LNK500
*Estimated tolerance achievable in high volume production
**See Optional Secondary Feedback section.
including transformer and other component tolerances.
P or G
HV DC Input
Wide Range
Example Characteristic
Output Characteristic Tolerance Envelopes (b).
Shown Above
For Circuit
(CV only)
OUTPUT POWER TABLE
4
Min
LinkSwitch
±25%*
230 VAC ±15% 85-265 VAC No-Load
3.2 W
4.3 W
D
Min
C
2
(CV/CC)
Typ
S
±10%
5.5 W 2.9 W 3.5 W <500 mW
Typ
4 W
I
O
2
(a)
(b)
V
O
2.4 W 3 W <300 mW
Min
Secondary Feedback**
±5%
2
With Optional
Typ
±25%*
2
February 2005
1
PI-3415-021103
Output
Power
(V
Input
DC
O
)
I
O
3

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lnk500 Summary of contents

Page 1

... LinkSwitch is specifically designed to replace low power linear transformer/RCC chargers and adapters at equal or lower system cost with much higher performance and energy efficiency. LNK500 is a lower cost version of the LNK501 with a wider tolerance output CC characteristic. LinkSwitch introduces a revolutionary patented topology for the design of low power ...

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-3416-032603 LNK500 Package (DIP-8B) G Package (SMD-8B) PI-3417-111802 ...

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. LNK500 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 LNK500 ...

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 LNK500 Typical inherent optocoupler optocoupler PI-2790-112102 5 D 2/05 ...

Page 6

... LNK500 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

... LNK500 AWG C4 0.1 µF R1 100 V 20.5 kΩ 4.7 µF 400 V D5 1N4937 R2 100 Ω PI-3419-071304 200 300 400 Output Current (mA) LNK500 116 AWG 470 µF TIW 11DQ06 EE13 2.55 mH PERFORMANCE SUMMARY Output Power: 2.75 W ≥72% Efficiency: ...

Page 8

... LNK500 To aid the designer, the power table reflects these differences. For CV/CC designs the typical power column and for CV designs the minimum power column should be used, respectively. Additionally, figures are based on the following conditions: 1. The minimum DC input bus voltage higher. This corresponds to a fi ...

Page 9

... capacitor is required, it should be connected close to the transformer secondary output return pin(s) and the primary bulk capacitor negative return. Such placement will maximize the EMI benefit of the Y capacitor and avoid problems in common- mode surge testing. LNK500 requires a diode PIV 2/05 ...

Page 10

... LNK500 Quick Design Checklist As with any power supply design, all LinkSwitch designs should be verified on the bench to make sure that component specifications are not exceeded under worst case conditions. Note LinkSwitch circuit, the SOURCE is a switching node. This should be taken into consideration during testing. ...

Page 11

... OSC(LOW) J Frequency = °C OSC(LOW 1 °C C DCT °C J See Figure DCT °C C DCT J LNK500 (1, ° oz. (610 g/m ) copper clad oz. (610 g/m ) copper clad Min Typ Max 34 2.4 3.8 5.2 1.8 3.15 4 -0.45 -0 ...

Page 12

... LNK500 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 LNK500 Min Typ Max Units 28 32 Ω µ ...

Page 14

... LNK500 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. LNK500 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

... LNK500 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) LNK500 P08B PI-2551-121504 17 D 2/05 ...

Page 18

... LNK500 ⊕ .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

... LNK500 19 D 2/05 ...

Page 20

... LNK500 Revision Notes B 1) Released Final Data Sheet Added lead-free ordering information Minor error and formatting corrections. 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 ...

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