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 FB BP/M Excellent load and line regulation Selectable device current limit D S + High current limit extends peak power and maximizes continuous LinkSwitch-TN2 Wide Range DC output power High-Voltage Output DC Input Low current limit allows the use of lowest-cost surface mount buck chokes 66 kHz operation with accurate current limit PI-7841-041816 Allows the use of low-cost off-the-shelf inductors Figure 1. Typical Buck Converter Application (See Application Examples Reduces size and cost of magnetics and output capacitor Section for Other Circuit Configurations). Frequency jittering reduces EMI lfi ter complexity Pin-out simpliefi s PCB heat sinking 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 Figure 2. Package Options. P: PDIP-8C, G: SMD-8C, D: SO-8C. field reliability 725 V MOSFET rating for excellent surge withstand Extremely low component count enhances reliability 1 Allows single-sided PCB and full SMD manufacturability Output Current Table 230 VAC 15% 85-265 VAC EcoSmart Extremely Energy Efficient 4 Product 2 3 2 3 Standby supply current <100 A MDCM CCM MDCM CCM On/Off control provides constant efcfi iency over a wide load range LNK3202P/G/D 63 mA 80 mA 63 mA 80 mA Easily meets all global energy efcfi iency regulations LNK3204P/G/D 120 mA 170 mA 120 mA 170 mA No-load <30 mW in high-side buck converters with external bias No-load <10 mW in yfl back converters with external bias LNK3205P/G/D 175 mA 270 mA 175 mA 270 mA LNK3206P/G/D 225 mA 360 mA 225 mA 360 mA Applications Appliances Table 1. Output Current Table. Metering Notes: Smart LED drivers and industrial controls 1. Typical output current in a non-isolated buck converter with devices operating IOT, home and building automation at default current limit and adequate heat sinking. Output power capability depends on respective output voltage and thermal requirements. See Key Description Applications Considerations Section for complete description of assumptions, including fully discontinuous conduction mode (DCM) operation. The LinkSwitch-TN2 family of ICs for non-isolated off-line power 2. Mostly discontinuous conduction mode. supplies provide dramatically improved performance compared to 3. Continuous conduction mode. 4. Packages: P: PDIP-8C, G: SMD-8C, D: SO-8C. 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 BYPASS pin capacitor value. The high current limit level provides topologies. Each device incorporates a 725 V power MOSFET, oscillator, maximum continuous output current while the low level permits using On/Off control for highest efficiency at light load, a high-voltage very low cost and small surface mount inductors. A full suite of switched current source for self-biasing, frequency jittering, fast protection features enable safe and reliable power supplies protecting (cycle-by-cycle) current limit, hysteretic thermal shutdown, and output the device and the system against input and output overvoltage faults, and input overvoltage protection circuitry onto a monolithic IC. 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 The device family is available in three different packages: PDIP-8C, worldwide. MOSFET current limit modes can be selected through the SO-8C, and SMD-8C. www.power.com November 2016 This Product is Covered by Patents and/or Pending Patent Applications. +LNK3202/3204-6 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-7879-100416 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. E 11/16 www.power.com - +