LNK3202/3204-6
LinkSwitch-TN2 Family
Highly Energy Efficient Off-line Switcher IC with Integrated System
Level Protection for Low Component-Count Power Supplies
Product Highlights
Highest Performance and Design Flexibility
• Supports buck, buck-boost and flyback topologies
• Low component-count buck converter
• Excellent load and line regulation
FB
BP/M
• Selectable device current limit
D
S
+
+
• High current limit extends peak power and maximizes continuous
output power
• Low current limit allows the use of lowest-cost surface mount
buck chokes
LinkSwitch-TN2
Wide Range
High-Voltage
DC Input
DC
Output
• 66 kHz operation with accurate current limit
• Allows the use of low-cost off-the-shelf inductors
• Reduces size and cost of magnetics and output capacitor
• Frequency jittering reduces EMI filter complexity
• Pin-out simplifies PCB heat sinking
PI-7841-041816
Figure 1. Typical Buck Converter Application (See Application Examples
Section for Other Circuit Configurations).
Enhanced Safety and Reliability Features
• Auto-restart for short-circuit and open loop faults
• Limits power delivery to 3% of maximum during a fault
• Output overvoltage protection (OVP)
• Line input overvoltage protection (OVL)
• Hysteretic over-temperature protection (OTP)
• Extended creepage between DRAIN pin and all other pins improves
field reliability
Figure 2. Package Options. P: PDIP-8C, G: SMD-8C, D: SO-8C.
• 725 V MOSFET rating for excellent surge withstand
• Extremely low component count enhances reliability
• Allows single-sided PCB and full SMD manufacturability
Output Current Table1
™
230 VAC ±15%
85-265 VAC
EcoSmart – Extremely Energy Efficient
Product4
MDCM2
CCM3
MDCM2
CCM3
• Standby supply current <100 μA
• On/Off control provides constant efficiency over a wide load range
• Easily meets all global energy efficiency regulations
• No-load <30 mW in high-side buck converters with external bias
• No-load <10 mW in flyback converters with external bias
LNK3202P/G/D
LNK3204P/G/D
LNK3205P/G/D
LNK3206P/G/D
63 mA
120 mA
175 mA
225 mA
80 mA
63 mA
120 mA
175 mA
225 mA
80 mA
170 mA
270 mA
360 mA
170 mA
270 mA
360 mA
Applications
• Appliances
• Metering
• Smart LED drivers and industrial controls
• IOT, home and building automation
Table 1. Output Current Table.
Notes:
1. Typical output current in a non-isolated buck converter with devices operating
at default current limit and adequate heat sinking. Output power capability
depends on respective output voltage and thermal requirements. See Key
Applications Considerations Section for complete description of assumptions,
including fully discontinuous conduction mode (DCM) operation.
2. Mostly discontinuous conduction mode.
Description
The LinkSwitch™-TN2 family of ICs for non-isolated off-line power
supplies provide dramatically improved performance compared to
traditional linear or cap-dropper solutions. Designs using the highly
integrated LinkSwitch-TN2 ICs are more flexible and feature increased
efficiency, comprehensive system level protection and higher reliability.
The device family supports buck, buck-boost and flyback converter
topologies. Each device incorporates a 725 V power MOSFET, oscillator,
On/Off control for highest efficiency at light load, a high-voltage
switched current source for self-biasing, frequency jittering, fast
(cycle-by-cycle) current limit, hysteretic thermal shutdown, and output
and input overvoltage protection circuitry onto a monolithic IC.
3. Continuous conduction mode.
4. Packages: P: PDIP-8C, G: SMD-8C, D: SO-8C.
BYPASS pin capacitor value. The high current limit level provides
maximum continuous output current while the low level permits using
very low cost and small surface mount inductors. A full suite of
protection features enable safe and reliable power supplies protecting
the device and the system against input and output overvoltage faults,
device over-temperature faults, lost regulation, and power supply output
overload or short-circuit faults.
LinkSwitch-TN2 ICs consume very little current in standby resulting in
power supply designs that meet all no-load and standby specifications
worldwide. MOSFET current limit modes can be selected through the
The device family is available in three different packages: PDIP-8C,
SO-8C, and SMD-8C.
www.power.com
January 2017
This Product is Covered by Patents and/or Pending Patent Applications.