®
LNK501
LinkSwitch
™
Family
Energy Efficient, CV/CC Switcher for
Very Low Cost Chargers and Adapters
Product Highlights
Cost Effective Linear/RCC Replacement
• Lowest cost, 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
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 clamp capacitor
• Controlled current in CC region provides inherent soft-start
• Optional opto feedback improves output voltage accuracy
LinkSwitch
D
C
S
Wide Range
HV DC Input
DC
Output
(V
O
)
(a)
V
O
±10%
V
O
±5%
±20%*
For Circuit
Shown Above
I
O
(b)
±20%*
With Optional
Secondary Feedback**
I
O
*Estimated tolerance achievable in high volume production
including transformer and other component tolerances.
**See Optional Secondary Feedback section.
PI-2776-091302
Figure 1. Typical Application – not a Simplified Circuit (a) and
Output Characteristic Tolerance Envelopes (b).
EcoSmart
- Extremely Energy Efficient
• Consumes <300 mW at 265 VAC input with no load
• Meets Blue Angel, Energy Star, and EC 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
• TV standby and other auxilliary supplies
®
OUTPUT POWER TABLE
1
PRODUCT
2
LNK501 P or G
230 VAC
±
15%
85-265 VAC
4W
3W
Table 1.
Notes:
1.
Typical output power for a design achieving
<300 mW no load consumption in an enclosed adapter measured at
50
°C
ambient. Higher reflected voltage will extend power capability
with increased no load consumption. See Key Application
Considerations.
2.
See Part Ordering Information.
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 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.
September 2002
POWERINT [ POWER INTEGRATIONS, INC. ]
