LNK623-626
®
LinkSwitch-CV Family
Energy-Efficient, Off-line Switcher with Accurate
Primary-side Constant-Voltage (CV) Control
Product Highlights
*
Dramatically Simplifies CV Converters
• Eliminates optocoupler and all secondary CV control circuitry
• Eliminates bias winding supply – IC is self biasing
Advanced Performance Features
• Compensates for external component temperature variations
• Very tight IC parameter tolerances using proprietary trimming
technology
• Continuous and/or discontinuous mode operation for design
flexibility
Wide Range
HV DC Input
D
S
FB
BP
LinkSwitch-CV
• Frequency jittering greatly reduces EMI filter cost
• Even tighter output tolerances achievable with external resistor
selection/trimming
PI-5195-080808
(a) Typical Application Schematic
±5%
VO
Advanced Protection/Safety Features
• Auto-restart protection reduces delivered power by >915 for
output short circuit and all control loop faults (open and shorted
components)
• Hysteretic thermal shutdown – automatic recovery reduces
power supply returns from the field
• Meets HV creepage requirements between Drain and all other
pins, both on the PCB and at the package
EcoSmart® – Energy Efficient
IO
PI-5196-080408
(b) Output Characteristic
• No-load consumption <200 mW at 230 VAC and down to
below 70 mW with optional external bias
• Easily meets all global energy efficiency regulations with no
added components
Figure 1. Typical Application Schematic (a) and Output Characteristic Envelope (b).
*Optional with LNK623-624PG/DG. (see Key Application Considerations section for
clamp and other external circuit design considerations).
• ON/OFF control provides constant efficiency down to very light
loads – ideal for mandatory EISA and ENERGY STAR 2.0
regulations
• No primary or secondary current sense resistors – maximizes
efficiency
Output Power Table
230 VAC ±±15
81-261 VAC
Product3
Peak or
Peak or
Adapter1
Open
Adapter1
Open
Frame2
Frame2
LNK623PG/DG
LNK624PG/DG
LNK625PG/DG
LNK626PG/DG
6.1 W
7 W
9 W
±± W
1.0 W
1.1 W
6.1 W
8.1 W
6 W
6.1 W
8 W
Green Package
• Halogen free and RoHS compliant package
8 W
±3.1 W
±7 W
Applications
• DVD/STB
±0.1 W
±0 W
• Adapters
Table 1. Output Power Table. Based on 5 V Output.
• Standby and auxiliary supplies
• Home appliances, white goods and consumer electronics
• Industrial controls
Notes:
±. Minimum continuous power in a typical non-ventilated enclosed adapter
measured at +10 °C ambient.
2. Maximum practical continuous power in an open frame design with adequate
heatsinking, measured at 10 °C ambient (see Key Application Considerations
section for more information).
Description
The LinkSwitch-CV dramatically simplifies low power, constant
voltage (CV) converter design through a revolutionary control
technique which eliminates the need for both an optocoupler and
secondary CV control circuitry while providing very tight output
voltage regulation. The combination of proprietary IC trimming
and E-Shield™ transformer construction techniques enables
Clampless™ designs with the LinkSwitch-CV LNK623/4.
3. Packages: P: DIP-8C, D: SO-8C.
LinkSwitch-CV provides excellent cross-regulation for multiple-
output flyback applications such as DVDs and STBs. A 700 V
power MOSFET and ON/OFF control state machine, self-biasing,
frequency jittering, cycle-by-cycle current limit, and hysteretic
thermal shutdown circuitry are all incorporated onto one IC.
www.powerint.com
September 2009
POWERINT [ Power Integrations ]
