InnoSwitch3-AQ INN3977CQ CV/CC QR Flyback Switcher IC with Integrated 750 V MOSFET and FluxLink Feedback for Automotive Applications Product Highlights Highly Integrated, Compact Footprint Up to 90% efficiency across full load range Incorporates a multi-mode Quasi-Resonant (QR) / CCM flyback SR FET controller, 750 V MOSFET and secondary-side sensing Integrated FluxLink, HIPOT-isolated, feedback link Wide input voltage 30 VDC to 550 VDC Wide input voltage 30 VDC to 921 VDC with StackFET AEC-Q100 qualified D InnoSwitch3-AQ Fab, assembly and test site are IATF16949 certified Optional VOUT Primary FET Current EcoSmart Energy Efficient and Controller Sense Less than 15 mW no-load including line sense S BPP IS Secondary Easily meets all global energy efficiency regulations Control IC Low heat dissipation Advanced Protection / Safety Features PI-8184a-031320 Auto-restart fault response for output OVP Figure 1. Typical Application Schematic. Optional Features Auto-restart output UV protection with option for peak power delivery Full Safety and Regulatory Compliance Reinforced isolation Isolation voltage >4000 VAC 100% production HIPOT testing UL1577 and TUV (EN60950) safety approved Excellent noise immunity enables designs that achieve class A Figure 2. High Creepage, Safety-Compliant InSOP-24D Package. performance criteria for EN61000-4 suite EN61000-4-2, 4-3 (30 V/m), 4-4, 4-5, 4-6, 4-8 (100 A/m) and 4-9 (1000 A/m), FMC1278 (RI-115) Green Package Output Power Table Halogen free and RoHS compliant 30 VDC 60 VDC 400 V MIN MIN Applications 2 Product Auxiliary, standby and bias power supplies for automotive used in Output Output Output traction inverter, DC-DC converter and on-board charger 1 1 1 Power Power Power Description INN3977CQ 10 W 20 W 30 W The InnoSwitch3-AQ family of ICs dramatically simplifies the design Table 1. Output Power Table. and manufacture of flyback power converters, particularly those Notes: requiring high efficiency and/or compact size. The InnoSwitch3-AQ 1. Max output power is dependent on the design. With condition that package family combines primary and secondary controllers and safety-rated temperature must be < 125 C. feedback into a single IC allowing accurate output voltage regulation 2. Package: InSOP-24D. even with wide input voltage range of 30 VDC to 550 VDC. InnoSwitch3-AQ family devices incorporate multiple protection features including line over and undervoltage protection, output overvoltage and over-current limiting, and over-temperature shutdown for automotive applications. Devices are available with standard and peak power delivery options, and commonly used auto-restart protection behaviors. www.power.com April 2020 This Product is Covered by Patents and/or Pending Patent Applications. FWD SR GND BPS FBInnoSwitch3-AQ DRAIN UNDER/OVER PRIMARY BYPASS (D) INPUT VOLTAGE (V) (BPP) PRIMARY BYPASS REGULATOR ENABLE ENABLE FAULT AUTO-RESTART PRIMARY LINE COUNTER GATE BYPASS PIN BPP/UV INTERFACE RESET UNDERVOLTAGE PRIMARY BPP/UV BYPASS PIN PRIM-CLK CAPACITOR SELECT AND UV/OV CURRENT V SHUNT OSCILLATOR/ LIMIT V V ILIM BP+ GATE TIMERS JITTER t t ON(MAX) OFF(BLOCK) GATE THERMAL SHUTDOWN GATE PRIM/SEC FAULT SecREQ OV/UV BPP From LATCH-OFF SecPulse Secondary SenseFET PRIM/SEC Controller Power Q S MOSFET Q R RECEIVER SEC- DRIVER CONTROLLER LATCH BPP/UV t LEB OFF(BLOCK) I S PRIM-CLK ILIM + LATCH-OFF PRIMARY OVP V - ILIM LATCH t ON(MAX) PI-8044-083017 SOURCE (S) Figure 3. Primary Controller Block Diagram. FORWARD SYNCRONOUS RECTIFIER DRIVE OUTPUT VOLTAGE (FWD) (SR) (VOUT) SR CONTROL REGULATOR FORWARD 4.4 V INH ENABLE BPS SECONDARY UV VOUT SR BYPASS (BPS) DETECTOR 4.4 V S Q 3.9 V + R Q SR THRESHOLD QR HANDSHAKE/ SECONDARY LATCH-OFF LATCH INH CONTROL DCM To FEEDBACK Primary (FB) Receiver INH FEEDBACK DRIVER VREF QR FEEDBACK COMPENSATION Ts MAX V PK CONSTANT t OFF(MIN) POWER t SECINH(MAX) OSCILLATOR/ IS THRESHOLD TIMER t SS(RAMP) SECONDARY ISENSE GROUND (IS) (GND) PI-8045d-091217 Figure 4. Secondary Controller Block Diagram. 2 Rev. B 04/20 www.power.com - + - + - + - +