LNK3604, LNK3694 & 3696 LinkSwitch-XT2 Family Energy Efficient, Low Power Off-Line Switcher IC With Integrated System Level Protection Product Highlights + DC Easy to Design OUT Lowest component count switcher solution Selectable device current limit Fully integrated auto-restart for short-circuit and open-loop protection LinkSwitch-XT2 Wide Range Optional self-biased supply High-Voltage D FB Frequency jittering greatly reduces EMI DC Input Meets HV creepage requirements between DRAIN and all other pins BP/M both on the PCB and at the package S Pin-out simplifies PCB heat sinking Features Superior to Linear/RCC Flyback converter with LNK3604 Output overvoltage protection (OVP) PI-8118-102516 Input overvoltage line protection (OVL) Figure 1. Typical Application with LinkSwitch-XT2. Hysteretic over-temperature protection (OTP) Extended creepage between DRAIN pin and all other pins improves field reliability 725 V MOSFET rating series for excellent surge withstand 900 V MOSFET rating series for industrial design or extra safety margin Extremely low component count enhances reliability Allows single-sided PCB and full SMD manufacturability EcoSmart Extremely Energy-Efficient Figure 2. Package Options. P: PDIP-8C, G: SMD-8C, D: SO-8C. Easily meets all global energy efficiency regulations No-load consumption <100 mW without bias winding at 265 VAC input (<10 mW with bias winding) (4) ON/OFF control provides constant efficiency to very light loads Output Power Table 1,2 Peak or Open Frame Applications (3) Flyback converters Product 725 V MOSFET Supplies for appliances, industrial systems, and metering 230 VAC 15% 85-265 VAC Description LNK3604P/G/D 9.2 W 6.1 W LinkSwitch-XT2 incorporates a 725 V / 900 V power MOSFET, 900 V MOSFET (3) Product oscillator, simple ON/OFF control scheme, a high-voltage switched 230 VAC 15% 85-265 VAC current source, frequency jittering, cycle-by-cycle current limit and LNK3694P/G 6 W 4 W thermal shutdown circuitry onto a monolithic IC. The start-up and LNK3696P/G 11 W 8 W operating power are derived directly from the DRAIN pin, eliminating the need for a bias winding and associated circuitry. Table 1. Output Power Table. Notes: 1. Maximum 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. 3. Packages: P: DIP-8C, G: SMD-8C, D: SO-8C. Please see Part Ordering Information. 4. See Key Application Considerations section for complete description of assumptions. www.power.com September 2018 This Product is Covered by Patents and/or Pending Patent Applications. +LNK3604, LNK3694 & 3696 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-7879-102318 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 P Package (DIP-8C) internally generated 5.0 V supply. G Package (SMD-8C) D Package (SO-8C) 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 in the standard current limit value. Use of a 1 F capacitor results 8 1 BP/M 1 8 S BP/M S in the current limit being reduced for lower power design. 2 7 It provides a shutdown function. When the current into the BYPASS FB 2 7 S FB S pin exceeds I for a time equal to 2 to 3 cycles of the internal BP(SD) 6 oscillator (f ), the device enters auto-restart. This can be used to S 6 S OSC provide an output overvoltage protection function with external 4 5 D S D 4 5 S circuitry. FEEDBACK (FB) Pin: During normal operation, switching of the power MOSFET is controlled by the FEEDBACK pin. The Power MOSFET switching is PI-7842-022416 terminated when a current greater than I (49 A) is delivered into FB this pin. Line overvoltage protection is detected when a current Figure 4. Pin Configuration. greater than I (670 A) is delivered into this pin for 2 consecutive FBSD switching cycles. 2 Rev. E 09/18 www.power.com - +