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LNK6407

Energy-Efficient, Accurate Primary-Side Regulation CV/CC Switcher for Adapters and Chargers

Unspecified 

LNK64x4-64x8

LinkSwitch-3 Family

Energy-Efficient, Accurate Primary-Side Regulation

CV/CC Switcher for Adapters and Chargers

Product Highlights

Dramatically Simplifies CV/CC Converters

• Eliminates optocoupler and all secondary CV/CC control circuitry

• Eliminates all control loop compensation circuitry

Advanced Performance Features

• Compensates for transformer inductance tolerances

• Compensates for input line voltage variations

• Compensates for cable voltage drop

• 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

• Minimum operation frequency fixed to improve transient load

response

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

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

• No current sense resistors – maximizes efficiency

Green Package

• Halogen free and RoHS compliant package

Applications

• Chargers for cell/cordless phones, PDAs, MP3/portable audio

devices, adapters, etc.

Description

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.

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.

DC

Output

Wide Range

High-Voltage

DC Input

D

FB

LinkSwitch-3

BP

S

PI-6907-020515

Figure 1. Typical Application – Not a Simplified Circuit.

Output Power Table1,2,3,4

Product5

LNK6404D / LNK6424D

LNK6405D / LNK6415D /

LNK6425D

LNK6406D / LNK6416D /

LNK6426D / LNK6436D /

LNK6446D

LNK6407D / LNK6417D /

LNK6427D

90-264 VAC

D (SO-8C) Package

Adapter

Open Frame

3.5 W

4.1 W

4.5 W

5.1 W

5.5 W

6.1 W

7.5 W

7.5 W

Product5

LNK6407K / LNK6417K /

LNK6427K

LNK6408K / LNK6418K /

LNK6428K / LNK6448K

LNK6408E / LNK6418E /

LNK6428E / LNK6448E

E (eSIP-7C) and

K (eSOP-12B) Packages

Adapter

Open Frame

8.5 W

9W

10 W

10 W

10 W

10 W

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.

www.power.com

This Product is Covered by Patents and/or Pending Patent Applications.

March 2016

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