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Power Integrations

LNK520 Datasheet Preview

LNK520 Datasheet

CV or CV/CC Switcher

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This product is not recommended for new designs.
LNK520
LinkSwitch Family
Energy Efficient, CV or CV/CC Switcher for
Very Low Cost Chargers and Adapters
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/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 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
Wide Range
HV DC Input
LinkSwitch
D
C
S
(a)
Example Characteristic
VO
Min
(CV only)
Typ
(CV/CC)
VO
±10%
±5%
+
DC
Output
(VO)
±24%*
For Circuit
Shown Above
IO
(b)
±24%*
IO
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.
PI-3587573-083064034
Figure 1. (a) Typical Application – not a Simplified Circuit and
(b) Output Characteristic Tolerance Envelopes.
PRODUCT4
LNK520
P or G
Output Power Table1
230 VAC ±15% 85-265 VAC
Min2
3.3 W
4.2 W
Typ2
4W
5.5 W
Min2 Typ2
2.4 W 3 W
2.9 W 3.5 W
No-Load
Input
Power
<300 mW
<500 mW3
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.
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.
September 2016




Power Integrations

LNK520 Datasheet Preview

LNK520 Datasheet

CV or CV/CC Switcher

No Preview Available !

LNK520
CONTROL
VC 0
ZC
SHUNT REGULATOR/
ERROR AMPLIFIER
-
+ 5.6 V
5.6 V
4.7 V
1
SHUTDOWN/
AUTO-RESTART
+
-
INTERNAL
SUPPLY
÷8
IFB
OSCILLATOR
DMAX
CLOCK
SAW
IDCS
RE
HYSTERETIC
THERMAL
SHUTDOWN
-
+
PWM
COMPARATOR
LOW
FREQUENCY
OPERATION
SQ
R
CURRENT
LIMIT
ADJUST
CURRENT LIMIT
COMPARATOR
-
+
LEADING
EDEDGGEE
BLANKING
Figure 2. Block Diagram.
Pin Functional Description
DRAIN (D) Pin:
Power MOSFET drain connection. Provides internal operating
current for start-up. Internal current limit sense point for drain
current.
CONTROL (C) Pin:
Error amplifier and feedback current input pin for duty cycle
and current limit control. Internal shunt regulator connection to
provide internal bias current during normal operation. It is also
used as the connection point for the supply bypass and auto-
restart/compensation capacitor.
SOURCE (S) Pin:
Output MOSFET source connection for high voltage power
return. Primary side control circuit common and reference
point.
LNK520
S1
S2
8C
7S
S3
S4
5D
P Package (DIP-8B)
G Package (SMD-8B)
Figure 3. Pin Configuration.
DRAIN
SOURCE
PI-2777-032503
PI-3790-121503
2
Rev. F 09/16
www.power.com


Part Number LNK520
Description CV or CV/CC Switcher
Maker Power Integrations
Total Page 20 Pages
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