LNK64x4-64x8
LinkSwitch-3 Family
Energy-Efficient, Accurate Primary-Side Regulation
CV/CC Switcher for Adapters and Chargers
Product Highlights
DC
Output
Dramatically Simplifies CV/CC Converters
• Eliminates optocoupler and all secondary CV/CC control circuitry
• Eliminates all control loop compensation circuitry
Advanced Performance Features
ꢀide Range
High-ꢁoltage
DC Input
• Compensates for transformer inductance tolerances
• Compensates for input line voltage variations
• Compensates for cable voltage drop
D
S
FB
BP
• Compensates for external component temperature variations
• Very accurate IC parameter tolerances using test trimming technology
• Frequency jittering greatly reduces EMI filter cost
• Programmable switching frequency up to 85 kHz to reduce trans-
former size
LinkSwitch-3
Pꢀ-6907-020515
• Minimum operation frequency fixed to improve transient load
response
Figure 1. Typical Application – Not a Simplified Circuit.
Advanced Protection/Safety Features
• Auto-restart protection reduces power delivered by >90% for output
short-circuit and control loop faults (open and shorted components)
• Hysteretic thermal shutdown – automatic recovery reduces power
supply returns from the field
• Meets high-voltage creepage requirements between DRAIN and all
other pins both on the PCB and at the package
Output Power Table1,2,3,4
90-264 VAC
D (SO-8C) Package
Adapter Open Frame
3.5 W 4.1 W
Product5
EcoSmart™– Energy Efficient
• Easily meets all global energy efficiency regulations with no added
components
• No-load consumption at 230 VAC input with bias winding <10 mW for
LNK64x4-LNK64x6 and <30 mW for LNK64x7-LNK64x8
• ON/OFF control provides constant efficiency down to very light loads
– ideal for CEC regulations
LNK6404D / LNK6424D
LNK6405D / LNK6415D /
LNK6425D
4.5 W
5.5 W
7.5 W
5.1 W
6.1 W
7.5 W
LNK6406D / LNK6416D /
LNK6426D / LNK6436D /
LNK6446D
LNK6407D / LNK6417D /
LNK6427D
• No current sense resistors – maximizes efficiency
Green Package
• Halogen free and RoHS compliant package
E (eSIP-7C) and
K (eSOP-12B) Packages
Product5
Applications
Adapter
Open Frame
• Chargers for cell/cordless phones, PDAs, MP3/portable audio
devices, adapters, etc.
LNK6407K / LNK6417K /
LNK6427K
8.5 W
9 W
Description
LNK6408K / LNK6418K /
LNK6428K / LNK6448K
10 W
10 W
10 W
10 W
The LinkSwitch™-3 family of ICs dramatically simplifies low power CV/
CC charger designs by eliminating an optocoupler and secondary
control circuitry. The device introduces a revolutionary control
technique to provide very accurate output voltage and current
regulation, compen-sating for transformer and internal parameter
tolerances along with input voltage variations.
LNK6408E / LNK6418E /
LNK6428E / LNK6448E
Table 1. Output Power Table.
Notes:
1. Assumes minimum input DC voltage >90 VDC, KP ≥1 (Recommend KP ≥1.15
for accurate CC regulation), η >78%, DMAX <55%.
2. Output power capability is reduced if a lower input voltage is used.
3. Minimum continuous power with adequate heat sink measured at 50 °C
ambient with device junction below 110 °C.
4. Assumes bias winding is used to supply BYPASS pin.
5. Package: D: SO-8C, E: eSIP-7C, K: eSOP-12B.
The device incorporates a 725 V power MOSFET, a novel ON/OFF control
state machine, a high-voltage switched current source for self biasing,
frequency jittering, cycle-by-cycle current limit and hysteretic thermal
shutdown circuitry onto a monolithic IC.
www.power.com
March 2016
This Product is Covered by Patents and/or Pending Patent Applications.
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