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Power Integrations

LNK623 Datasheet Preview

LNK623 Datasheet

Energy-Efficient / Off-line Switcher

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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 LinkSwitchTM-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.
LinkSwitch-CV provides excellent cross-regulation for multiple-output
flyback applications such as DVDs and STBs. A 725 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.
*
Wide Range
High-Voltage
DC Input
D
LinkSwitch-CV
S
FB
BP
PI-5195-012915
(a) Typical Application Schematic
VO ±5%
Auto-Restart
PI-5196-012315
(b) Output Characteristic
IO
Figure 1. Typical Application Schematic (a) and Output Characteristic Envelope
(b). *Optional with LNK623-624PG/DG. (see Key Application Consider-
ations section for clamp and other external circuit design considerations).
Output Power Table
Product3
LNK623PG/DG
LNK624PG/DG
230 VAC ±15%
Peak or
Adapter1 Open
Frame2
6.5 W
9W
7 W 11 W
85-265 VAC
Peak or
Adapter1 Open
Frame2
5.0 W
6W
5.5 W
6.5 W
LNK625PG/DG
LNK626PG/DG
8W
10.5 W
13.5 W
17 W
6.5 W
8.5 W
8W
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
heat sinking, measured at 50 °C ambient (see Key Application Considerations
section for more information).
3. Packages: P: PDIP-8C, D: SO-8C.
Figure 2. PDIP-8C and SO-8C Packages.
www.power.com
This Product is Covered by Patents and/or Pending Patent Applications.
August 2016




Power Integrations

LNK623 Datasheet Preview

LNK623 Datasheet

Energy-Efficient / Off-line Switcher

No Preview Available !

LNK623-626
BYPASS
(BP)
FEEDBACK
(FB)
VTH
6.5 V
SOURCE
(S)
+
-
tSAMPLE-OUT
FB
OUT
DQ
STATE
MACHINE
Reset
VILIMIT
6V
5V
ILIM
DCMAX
Drive
+
-
REGULATOR
6V
FAULT
FB Auto-Restart
Open-Loop
DCMAX
OSCILLATOR
ILIM
THERMAL
SHUTDOWN
tSAMPLE-OUT
SAMPLE
DELAY
+
- VILIMIT
Current Limit
Comparator
LEADING
EDGE
BLANKING
Figure 3 Functional Block Diagram.
DRAIN
(D)
SOURCE
(S)
PI-5197-012915
Pin Functional Description
DRAIN (D) Pin:
This pin is the power MOSFET drain connection. It provides internal
operating current for both start-up and steady-state operation.
BYPASS (BP) Pin:
This pin is the connection point for an external bypass capacitor for
the internally generated 6 V supply.
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. This pin senses the AC voltage on the bias
winding. This control input regulates the output voltage based on the
flyback voltage of the bias winding.
SOURCE (S) Pin:
This pin is internally connected to the output MOSFET source for
high-voltage power and control circuit common returns.
P Package (DIP-8C)
FB 1
BP 2
D4
8S
7S
6S
5S
Figure 4. Pin Configuration.
D Package (SO-8C)
FB 1
2
BP
4
D
8
S
7
S
6
S
5
S
PI-5198-012315
2
Rev. I 08/16
www.power.com


Part Number LNK623
Description Energy-Efficient / Off-line Switcher
Maker Power Integrations
PDF Download

LNK623 Datasheet PDF






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