LNK520GN Power Integrations, LNK520GN Datasheet

IC SWIT OCP CV/CC HV 8SMD

LNK520GN

Manufacturer Part Number
LNK520GN
Description
IC SWIT OCP CV/CC HV 8SMD
Manufacturer
Power Integrations
Series
LinkSwitch®r
Datasheet

Specifications of LNK520GN

Output Isolation
Isolated
Frequency Range
24 ~ 49.5kHz
Voltage - Output
700V
Power (watts)
5.50W
Operating Temperature
-40°C ~ 150°C
Package / Case
8-SMD Gull Wing, 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
0.75 mA
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
SMD/SMT
For Use With
596-1006 - KIT DESIGN ACCELERATOR ADAPTER
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
LNK520
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)
• Optimized for bias winding feedback
• Up to 75% lighter power supply reduces shipping cost
• Primary based CV/CC solution eliminates 10 to 20
• Fully integrated auto-restart for short circuit and open
• 42 kHz operation with optimized switching
Much Higher Performance Over Linear/RCC
• Universal input range allows worldwide operation
• Up to 70% reduction in power dissipation – reduces
• 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
• 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.
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
or constant voltage/constant current (CV/CC) solutions
secondary components for low system cost
loop fault protection – saves external component costs
characteristics for significantly reduced EMI
enclosure size significantly
additional bias capacitor
Star, 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
Considerations section. 4. For lead-free package options, see Part
Ordering Information.
Figure 1. (a) Typical Application – not a Simplified Circuit and
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.
PRODUCT
V
O
LNK520
P or G
*Estimated tolerance achievable in high volume production (external
**See Optional Secondary Feedback section.
components with ±7.5% transformer inductance tolerance included).
HV DC Input
Wide Range
Example Characteristic
(b) Output Characteristic Tolerance Envelopes.
Shown Above
For Circuit
(CV only)
LinkSwitch
OUTPUT POWER TABLE
4
Min
±24%*
230 VAC ±15% 85-265 VAC No-Load
3.3 W
4.2 W
Min
2
(CV/CC)
Typ
±10%
5.5 W 2.9 W 3.5 W <500 mW
Typ
D
S
4 W
I
O
C
(a)
2
(b)
V
O
2.4 W 3 W <300 mW
Min
Secondary Feedback**
±5%
2
With Optional
see Key Application
Typ
±24%*
2
1
February 2005
PI-3577-080603
PI-3853-030404
+
Output
Power
Input
(V
DC
O
)
I
O
3

Related parts for LNK520GN

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 ...

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