IC SWIT OCP CV/CC HV 8SMD

LNK520GN

Manufacturer Part NumberLNK520GN
DescriptionIC SWIT OCP CV/CC HV 8SMD
ManufacturerPower Integrations
SeriesLinkSwitch®
LNK520GN datasheet
 

Specifications of LNK520GN

Output IsolationIsolatedFrequency Range24 ~ 49.5kHz
Voltage - Output700VPower (watts)5.50W
Operating Temperature-40°C ~ 150°CPackage / Case8-SMD Gull Wing, 7 Leads
Output Voltage5.6 VInput / Supply Voltage (max)265 VAC
Input / Supply Voltage (min)85 VACDuty Cycle (max)80 %
Switching Frequency42 KHzSupply Current0.75 mA
Operating Temperature Range- 40 C to + 150 CMounting StyleSMD/SMT
For Use With596-1006 - KIT DESIGN ACCELERATOR ADAPTERLead Free Status / RoHS StatusLead free / RoHS Compliant
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LNK520
LinkSwitch
Energy Efficient, CV or CV/CC Switcher for
Very Low Cost Adapters and Chargers
Product Highlights
Cost Effective Linear/RCC Replacement
• Lowest cost and component count, constant voltage (CV)
or constant voltage/constant current (CV/CC) solutions
• Optimized for bias winding feedback
• Up to 75% lighter power supply reduces shipping cost
• Primary based CV/CC solution eliminates 10 to 20
secondary components for low system cost
• Fully integrated auto-restart for short circuit and open
loop fault protection – saves external component costs
• 42 kHz operation with optimized switching
characteristics for significantly reduced EMI
Much Higher Performance Over Linear/RCC
• 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 bias capacitor
• Controlled current in CC region provides inherent soft-start
• Optional opto feedback improves output voltage accuracy
®
– Extremely Energy Efficient
EcoSmart
• Consumes <300 mW at 265 VAC input with no load
• Meets California Energy Commission (CEC), Energy
Star, and EU requirements
• No current sense resistors – maximizes efficiency
Applications
• Linear transformer replacement in all ≤3 W applications
• Chargers for cell phones, cordless phones, PDAs, digital
cameras, MP3/portable audio devices, shavers, etc.
• 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.
LNK520 is equivalent to LNK500 but optimized for use with bias
winding feedback and has improved switching characteristics
for significantly reduced EMI. In addition, if bias and output
windings are magnetically well coupled, output voltage load
Family
®
V
O
*Estimated tolerance achievable in high volume production (external
components with ±7.5% transformer inductance tolerance included).
**See Optional Secondary Feedback section.
Figure 1. (a) Typical Application – not a Simplified Circuit and
PRODUCT
LNK520
P or G
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
Considerations section. 4. For lead-free package options, see Part
Ordering Information.
regulation can be improved. 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.
Wide Range
HV DC Input
D
LinkSwitch
C
S
(a)
Example Characteristic
Min
V
Typ
O
(CV only)
(CV/CC)
±5%
±10%
I
O
±24%*
(b)
For Circuit
Shown Above
Secondary Feedback**
(b) Output Characteristic Tolerance Envelopes.
OUTPUT POWER TABLE
230 VAC ±15% 85-265 VAC No-Load
4
Min
Typ
Min
2
2
2
3.3 W
4 W
2.4 W 3 W <300 mW
4.2 W
5.5 W 2.9 W 3.5 W <500 mW
+
DC
Output
(V
)
O
I
O
±24%*
With Optional
PI-3577-080603
PI-3853-030404
1
Input
Typ
2
Power
3
see Key Application
February 2005

LNK520GN Summary of contents

  • Page 1

    LNK520 LinkSwitch Energy Efficient CV/CC Switcher for Very Low Cost Adapters and Chargers Product Highlights Cost Effective Linear/RCC Replacement • Lowest cost and component count, constant voltage (CV) or constant voltage/constant current (CV/CC) solutions • Optimized for bias ...

  • Page 2

    LNK520 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 schematic outline which is used below to describe the LinkSwitch operation. Power ...

  • Page 4

    LNK520 85-265 VAC Figure 6. Power Supply Schematic Outline with Optocoupler Feedback, Providing Tight CV Regulation. 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 ...

  • Page 5

    Output Voltage Voltage feedback threshold Load variation during battery charging Figure 7. Influence of the Optocoupler on the Power Supply Output Characteristic. Output Voltage Voltage feedback threshold Load variation during battery charging Figure 8. Output Characteristic with Optocoupler Regulation (Reduced ...

  • Page 6

    LNK520 LinkSwitch (a) Figure 9. High-side Configuration Using LNK520: (a) Schematic Outline; (b) Typical Output Characteristic Envelope. To achieve this goal, the minimum voltage feedback threshold should be set This will ensure that the ...

  • Page 7

    D1 D2 0.15 A 1N4005 1N4005 RF1 8.2 Ω 265 VAC 4.7 µF 400 1N4005 1N4005 Figure 10. 2.75 W Constant Voltage/Constant Current (CV/CC) Charger Using LinkSwitch ...

  • Page 8

    LNK520 The output during CV operation is equal to the primary-side bias voltage multiplied by the turns ratio. The bias voltage, in turn, is the sum of the CONTROL pin voltage (approximately 5.7 V), the voltage across the bias feedback ...

  • Page 9

    Core gaps should be uniform. Uneven core gapping, especially with small gap sizes, may cause variation in the primary inductance with flux density (partial saturation) and make the constant current region non-linear. To verify uniform gapping recommended that ...

  • Page 10

    ... The LNK520 can, however, be used in the high-side configuration in certain applications. Refer to Figure 9 and supporting description. Table 2 summarizes the considerations for selecting which device to use. Design Tools Up to date information on design tools can be found at the Power Integrations Web site: www.powerint.com. does not exceed ensure the P ...

  • Page 11

    Y1- Capacitor Transformer Output Capacitor Figure 12. Recommended Circuit Board Layout for LinkSwitch using LNK520. LinkSwitch Out + LNK520 Input Filter Capacitor + HV DC Input - PI-3732-103003 11 E 2/05 ...

  • Page 12

    LNK520 Family • Lowest cost CV/CC implementation • Source is connected to the switching node – simple circuit configuration & low component count • Fast switching speeds minimize losses for best efficiency • Source PCB copper heatsink connected to switching ...

  • Page 13

    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 14

    LNK520 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 15

    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 16

    LNK520 Figure 14. LinkSwitch General Test Circuit. VOLTAGE Figure 15. Duty Cycle Measurement. Typical Performance Characteristics 5. 1.6 1.2 0.8 0 DRAIN Voltage (V) Figure 16. I ...

  • Page 17

    Typical Performance Characteristics (cont 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 CONTROL Pin Current (mA) Figure 18. Duty Cycle vs. CONTROL Pin Current. 1.200 1.000 0.800 0.600 0.400 ...

  • Page 18

    LNK520 Typical Performance Characteristics (cont.) 1.2 1 0.8 0.6 0.4 0 Temperature (°C) Figure 24. PWM Gain vs. Temperature. PART ORDERING INFORMATION LNK 520 2/05 300 250 200 150 100 ...

  • Page 19

    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 20

    ... 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 ...