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LNK520 Datasheet(PDF) 1 Page - Power Integrations, Inc.

Part No. LNK520
Description  Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

LNK520 Datasheet(HTML) 1 Page - Power Integrations, Inc.

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Figure 1. (a) Typical Application – not a Simplified Circuit and
(b) Output Characteristic Tolerance Envelopes.
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
EcoSmart®
– Extremely Energy Efficient
• 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/RCCchargersandadaptersatequalorlowersystem
cost with much higher performance and energy efficiency.
LNK520isequivalenttoLNK500butoptimizedforusewithbias
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
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.
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.
LNK520
LinkSwitch®
Family
Energy Efficient, CV or CV/CC Switcher for
Very Low Cost Adapters and Chargers
February 2005
+
PI-3577-080603
Min
(CV only)
Example Characteristic
Typ
(CV/CC)
(a)
(b)
For Circuit
Shown Above
With Optional
Secondary Feedback**
*Estimated tolerance achievable in high volume production (external
components with
±7.5% transformer inductance tolerance included).
**See Optional Secondary Feedback section.
±10%
±24%*
±5%
±24%*
IO
IO
VO
VO
DC
Output
(VO)
Wide Range
HV DC Input
S
D
C
LinkSwitch
PI-3853-030404
OUTPUT POWER TABLE1
PRODUCT4
230 VAC ±15% 85-265 VAC No-Load
Input
Power
Min2
Typ2 Min2 Typ2
LNK520
P or G
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 mW3


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