LNK623 Datasheet, PDF (1/18 Pages) Power Integrations, Inc. – Energy-Effi cient, Off-line Switcher with Accurate Primary-side Constant-Voltage (CV) Control

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
• Frequency jittering greatly reduces EMI filter cost
• Even tighter output tolerances achievable with external resistor
selection/trimming
Advanced Protection/Safety Features
• Auto-restart protection reduces delivered power by >95% 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
• 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
• 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
Green Package
• Halogen free and RoHS compliant package
Applications
• DVD/STB
• Adapters
• Standby and auxiliary supplies
• Home appliances, white goods and consumer electronics
• Industrial controls
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.
*
Wide Range
HV DC Input
D
FB
LinkSwitch-CV
BP
S
PI-5195-080808
(a) Typical Application Schematic
V_O
±5%
Auto-Restart
PI-5196-080408
I_O
(b) Output Characteristic
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).
Output Power Table
Product³
LNK623PG/DG
LNK624PG/DG
LNK625PG/DG
LNK626PG/DG
230 VAC ±15%
Adapter¹
Peak or
Open
Frame²
6.5 W
9W
7W
11 W
8W
13.5 W
10.5 W
17 W
85-265 VAC
Adapter¹
Peak or
Open
Frame²
5.0 W
6W
5.5 W
6.5 W
6.5 W
8W
8.5 W
10 W
Table 1. Output Power Table. Based on 5 V Output.
Notes:
1. Minimum continuous power in a typical non-ventilated enclosed adapter
measured at +50 °C ambient.
2. Maximum practical continuous power in an open frame design with adequate
heatsinking, measured at 50 °C ambient (see Key Application Considerations
section for more information).
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