LNK3206GQ LinkSwitch-TN2 Family for Automotive Highly Energy Efficient 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 Wide input voltage 60 VDC to 550 VDC FB BP/M Excellent load and line regulation D S + 66 kHz operation with accurate current limit LinkSwitch-TN2 Wide Range DC Allows the use of low-cost off-the-shelf inductors 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 AEC-Q100 qualiefi d Figure 1. Typical Buck Converter Application (See Application Examples Fab and assembly are IATF16949 certiefi d Section for Other Circuit Configurations). Enhanced Safety and Reliability Features Auto-restart for short-circuit and open loop faults Output overvoltage protection (OVP) Hysteretic over-temperature protection (OTP) Extended creepage between DRAIN pin and all other pins improves field reliability 750 V MOSFET rating for excellent surge withstand EcoSmart Extremely Energy Efficient Standby supply current <100 A Figure 2. Package Option G: SMD-8C. On/Off control provides constant efcfi iency over a wide load range Easily meets all global energy efcfi iency regulations No-load consumption <50 mW Application 1 Auxiliary power supplies for automotive HVAC, climate control, Output Current Table DC-DC converter, and onboard charger 2 Product 60 to 550 VDC Emergency power supply for traction inverter LNK3206GQ 360 mA Description The LinkSwitch-TN2 family of ICs for automotive power supplies Table 1. Output Current Table. provide significant reduction in component count compared to Notes: traditional discrete solutions. Designs using the integrated 1. Typical output current in a non-isolated buck converter with devices operating LinkSwitch-TN2 ICs are highly reliable without the use of opto isolators. at default current limit and adequate heat sinking. Output power capability The device family supports buck, buck-boost and flyback converter depends on respective output voltage and thermal requirements. topologies. Each device incorporates a 750 V power MOSFET, oscillator, 2. Package: G: SMD-8C. On/Off control, a high-voltage switched current source for self-biasing, frequency jittering, fast (cycle-by-cycle) current limit, hysteretic thermal shutdown, and output and overvoltage protection circuitry onto a monolithic IC. LinkSwitch-TN2 ICs consume very little current in standby resulting in power supply designs that meet <50 mW no-load input at 400 VDC input. 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. www.power.com April 2020 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: It is the connection point for an external bypass capacitor for the G Package (SMD-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 BP/M 1 8 S in the standard current limit value. Use of a 1 F capacitor results in the current limit being reduced, allowing design with lowest cost FB 2 7 S surface mount buck chokes. It provides a shutdown function. When the current into the BYPASS 6 S pin exceeds I for a time equal to 2 to 3 cycles of the internal BPSD D 4 5 S oscillator (f ), the device enters auto-restart. This can be used to OSC provide an output overvoltage protection function with external circuitry. FEEDBACK (FB) Pin: PI-5910b-102319 During normal operation, switching of the power MOSFET is con- trolled by the FEEDBACK pin. MOSFET switching is terminated when Figure 4. Pin Configuration. a current greater than I (49 A) is delivered into this pin. Line 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. B 04/20 www.power.com - +