InnoSwitch3-AQ INN3977CQ, INN3996CQ CV/CC QR Flyback Switcher IC with Integrated 750 V and 900 V Switch and FluxLink Feedback for Automotive Applications +V +HVDC OUT 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 and 900 V switch and secondary-side sensing Integrated FluxLink, HIPOT-isolated, feedback link Wide input voltage 30 V to 925 V with StackFET AEC-Q100 qualified Fab, assembly and test site are IATF16949 certified D V InnoSwitch3-AQ EcoSmart Energy Efficient Optional VOUT Primary Switch Current Less than 15 mW no-load and Controller Sense Low heat dissipation S BPP IS Secondary Control IC Advanced Protection / Safety Features 0 V RTN Auto-restart fault response for output OVP PI-8184h-020521 Optional Features Figure 1. Typical Application Schematic. 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 approved and TUV (EN60950) in process Excellent noise immunity enables designs that achieve class A 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) Figure 2. High Creepage, Safety-Compliant InSOP-24D Package. Green Package Halogen free and RoHS compliant Applications Output Power Table Auxiliary, standby and bias power supplies for automotive used in traction inverter, DC-DC converter and on-board charger 1 Output Power 2 Product Description 3 30 V 60 V 400 V 800 V MIN MIN The InnoSwitch3-AQ family of ICs dramatically simplifies the design and manufacture of flyback power converters, particularly those INN3977CQ 10 W 20 W 30 W 30 W requiring high efficiency and/or compact size. The InnoSwitch3-AQ INN3996CQ 7 W 14 W 20 W 20 W family combines primary and secondary controllers and safety-rated feedback into a single IC allowing accurate output voltage regulation Table 1. Output Power Table. even with wide input voltage range of 30 V to 925 V. Notes: 1. Max output power is dependent on the design. With condition that package InnoSwitch3-AQ family devices incorporate multiple protection features temperature must be < 125 C. Uses PCB copper for heat sinking. including line over and undervoltage protection, output overvoltage 2. Package: InSOP-24D. 3. With StackFET. 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 February 2021 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 VSHUNT OSCILLATOR/ V LIMIT V GATE ILIM BP+ TIMERS JITTER t t ON(MAX) OFF(BLOCK) THERMAL GATE SHUTDOWN GATE PRIM/SEC FAULT SecREQ OV/UV BPP From SecPulse SenseFET Secondary PRIM/SEC Power Controller Q S Switch R Q SEC- RECEIVER DRIVER LATCH CONTROLLER BPP/UV t LEB OFF(BLOCK) I S PRIM-CLK ILIM + LATCH-OFF/ PRIMARY OVP AUTO-RESTART LATCH/ V - ILIM AUTO-RESTART t ON(MAX) PI-8044h-111219 SOURCE (S) Figure 3. Primary Controller Block Diagram. FORWARD SYNC RECTIFIER DRIVE (FW) (SR) VOUT SR CONTROL VO REGULATOR FORWARD V BPS INH ENABLE BPS SECONDARY UV VO SR BYPASS (BPS) DETECTOR S Q V BPS(UVLO)(TH) + R Q SR THRESHOLD QR HANDSHAKE/ SECONDARY AUTO-RESTART LATCH/ INH CONTROL AUTO-RESTART DCM FEEDBACK (FB) INH FEEDBACK DRIVER VREF QR CABLE DROP COMPENSATION/ SR FEEDBACK COMPENSATION Ts MAX IS THRESHOLD t OFF(MIN) t OSCILLATOR/ SECINH(MAX) TIMER t SS(RAMP) SECONDARY ISENSE GROUND (IS) (GND) PI-8045l-101619 Figure 4. Secondary Controller Block Diagram. 2 Rev. D 02/21 www.power.com - + - + - + - +