STCMB1 TM PFC with X-cap discharge and LLC resonant combo controller Datasheet - production data Applications Ac-dc adapter, open frame SMPS SMPS for LED TV, desktop and all-in-one PC Consumer and industrial SMPS compliant with Energy Using Product directive (EuP) Lot 6, DOE and European CoC ver. 5, Tier 2 SO20W LED street lighting Features Common features SO20W package 800 V high voltage start-up with integrated input voltage sensing Active input filter capacitor discharge circuitry for reduced standby power compliant with IEC 62368-1 and UL Demko certified Independent debug mode for both converters PFC controller features Enhanced constant on-time PFC with input voltage feedforward, THD optimizer Complete set of protections: ac brown- in/out, inrush control, OVP, OCP, inductor saturation, feedback disconnection LLC controller features Proprietary timeshift control for improved input ripple rejection and dynamic response Half-bridge operation up to 750 kHz with self-adjusting deadtime Complete set of protections: dc brown-out, two-level OCP, hard switching prevention (HSP) function for anti-capacitive mode protection and safe start-up Synchronous burst mode operation with PFC enhances light-load efficiency January 2018 DocID028958 Rev 4 1/59 This is information on a product in full production. www.st.comContents STCMB1 Contents 1 Description . 4 2 Block diagrams . 5 3 Pin connections and description . 6 4 Electrical ratings . 10 5 Thermal data 10 6 Electrical data . 11 7 Application information . 15 7.1 HV start-up 15 7.2 X-cap discharge 16 7.3 Ac brown-out protection 17 7.4 VCC pin 18 7.5 PFC section . 18 7.6 PFC: enhanced constant on-time control with THD optimizer . 18 7.7 PFC: error amplifier, regulation loop and V 23 FF 7.8 PFC: C calculation . 24 TON 7.9 PFC: light-load operation . 25 7.10 PFC: inductor current sensing on ground return and PFC OCP . 25 7.11 PFC: zero-current detector 26 7.12 Starter 26 7.13 PFC: Dynamic OVP and feedback failure protection (latched) 27 7.14 PFC gate driver 28 7.15 Resonant HB section 28 7.16 Dc brown-out function (HB enable and disable) 30 7.17 HB: timeshift control basic concept . 31 7.18 HB: oscillator 33 7.19 HB: Soft-start 35 7.20 HB: improved burst mode operation at light-load . 37 2/59 DocID028958 Rev 4