LNK3202/3204-6, LNK3294 & LNK3296 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 Excellent load and line regulation FB BP/M Selectable device current limit D S 66 kHz operation with accurate current limit + LinkSwitch-TN2 Wide Range Allows the use of low-cost off-the-shelf inductors DC High-Voltage Output Reduces size and cost of magnetics and output capacitor DC Input Frequency jittering reduces EMI lfi ter complexity Pin-out simpliefi s PCB heat sinking PI-7841-041816 Figure 1. Typical Buck Converter Application (See Application Examples Enhanced Safety and Reliability Features Section for Other Circuit Configurations). Auto-restart for short-circuit and open loop faults 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 725 V MOSFET rating for excellent surge withstand 900 V MOSFET rating series for industrial or extra safety margin EcoSmart Extremely Energy Efficient Figure 2. Package Options. P: PDIP-8C, G: SMD-8C, D: SO-8C. Standby supply current <100 A On/Off control provides constant efcfi iency over a wide load range 1 Output Current Table Easily meets all global energy efcfi iency regulations No-load consumption <30 mW with external bias 725 V MOSFET 230 VAC 15% 85-265 VAC Applications 4 Product Appliances 2 3 2 3 MDCM CCM MDCM CCM Metering LNK3202P/G/D 63 mA 80 mA 63 mA 80 mA Smart LED drivers and industrial controls IOT, home and building automation LNK3204P/G/D 120 mA 170 mA 120 mA 170 mA LNK3205P/G/D 175 mA 270 mA 175 mA 270 mA Description LNK3206P/G/D 225 mA 360 mA 225 mA 360 mA The LinkSwitch-TN2 family of ICs for non-isolated off-line power 900 V MOSFET supplies provide dramatically improved performance compared to 4 traditional linear or cap-dropper solutions. Designs using the highly 230 VAC 15% 85-265 VAC Product integrated LinkSwitch-TN2 ICs are more flexible and feature increased 2 3 2 3 MDCM CCM MDCM CCM efficiency, comprehensive system level protection and higher reliability. LNK3294P/G 120 mA 170 mA 120 mA 170 mA The device family supports buck, buck-boost and flyback converter topologies. Each device incorporates a 725 V power MOSFET, oscillator, LNK3296P/G 225 mA 360 mA 225 mA 360 mA On/Off control for highest efficiency at light load, a high-voltage Table 1. Output Current Table. switched current source for self-biasing, frequency jittering, fast Notes: (cycle-by-cycle) current limit, hysteretic thermal shutdown, and output 1. Typical output current in a non-isolated buck converter with devices operating and input overvoltage protection circuitry onto a monolithic IC. at default current limit and adequate heat sinking. Output power capability depends on respective output voltage and thermal requirements. See Key LinkSwitch-TN2 ICs consume very little current in standby resulting in Applications Considerations Section for complete description of assumptions, power supply designs that meet all no-load and standby specifications including fully discontinuous conduction mode (DCM) operation. worldwide. MOSFET current limit modes can be selected through the 2. Mostly discontinuous conduction mode. BYPASS pin capacitor value. The high current limit level provides 3. Continuous conduction mode. 4. Packages: P: PDIP-8C, G: SMD-8C, D: SO-8C. 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 family is available in three different packages: PDIP-8C, the device and the system against input and output overvoltage faults, SO-8C, and SMD-8C (725 V PNs only). device over-temperature faults, lost regulation, and power supply output overload or short-circuit faults. www.power.com February 2019 This Product is Covered by Patents and/or Pending Patent Applications. +LinkSwitch-TN2 BYPASS DRAIN (BP/M) (D) REGULATOR 5.0 V FAULT I I FBSD FB PRESENT BYPASS PIN CAPACITOR 5.2 V DETECT AUTO-RESTART BYPASS PIN COUNTER UNDERVOLTAGE OVL + CURRENT LIMIT CLOCK COMPARATOR 5.0 V - RESET 4.5 V V I LIMIT JITTER CLOCK THERMAL SHUTDOWN DC MAX OSCILLATOR S Q FEEDBACK (FB) R Q 2.0 V -V T LEADING EDGE BLANKING OVP DETECT SOURCE (S) PI-7879-020819 Figure 3. Functional Block Diagram. Pin Functional Description SOURCE (S) Pin: This pin is the power MOSFET source connection. It is also the DRAIN (D) Pin: ground reference for the BYPASS and FEEDBACK pins. Power MOSFET drain connection. Provides internal operating current for both start-up and steady-state operation. BYPASS (BP/M) Pin: This pin has multiple functions: P Package (DIP-8C) It is the connection point for an external bypass capacitor for the G Package (SMD-8C) D Package (SO-8C) internally generated 5.0 V supply. It is a mode selector for the current limit value, depending on the value of the capacitance added. Use of a 0.1 F capacitor results 1 8 in the standard current limit value. Use of a 1 F capacitor results BP/M 1 8 S BP/M S in the current limit being reduced, allowing design with lowest cost 2 7 2 7 FB S FB S surface mount buck chokes. It provides a shutdown function. When the current into the BYPASS 6 S 6 S pin exceeds I for a time equal to 2 to 3 cycles of the internal BPSD 4 5 oscilator (f ), the device enters auto-restart. This can be used to D S OSC 4 5 D S provide an output overvoltage protection function with external circuitry. FEEDBACK (FB) Pin: During normal operation, switching of the power MOSFET is con- PI-7842-022416 trolled by the FEEDBACK pin. MOSFET switching is terminated when a current greater than I (49 A) is delivered into this pin. Line Figure 4. Pin Configuration. FB overvoltage protection is detected when a current greater than I FBSD (670 A) is delivered into this pin for 2 consecutive switching cycles. 2 Rev. G 02/19 www.power.com - +