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BD4220AMUV Fiches technique(PDF) 3 Page - Rohm |
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BD4220AMUV Fiches technique(HTML) 3 Page - Rohm |
3 / 5 page 3/4 REV. A ○ Blosk Diagrum ○ UVLO、TSD、SDP Fig.3 Block diagram Fig.4 Timing Chart: Under Protective Circuit Operation ◆UVLO If the VCC voltage is reduced to the UVLO detection voltage specified in the electrical characteristics or less, the UVLO protective circuit is activated and the charging operation temporarily stops. (See Time ○ C and ○ E in Fig.4.) After that, when the VDD voltage becomes the UVLO release voltage or more, the charging operation automatically restarts. (See Time ○ D and ○ F in Fig.4.) ◆VDD UVLO If the VDD voltage becomes the VDD UVLO detection voltage or less, the IGBT_OUT voltage is forced to be set to "L". ◆Termal Shut Down (TSD) It protects the IC against thermal runaway due to excessive temperature rise (Tj>175°C [TYP]). After detection, the charging operation temporarily stops (See time ○ G in Fig.4.), and when the chip temperature decreases, (Tj<150°C [TYP]), it automatically restarts. (See Time ○ H in Fig.4.) ◆VC pin short detection (SDP) If the VC pin becomes the GND level due to any failure and the PowerMOS repeats switching 216(=65536) times which is the SDP count number (TSDP) at the maximum OFF time, it is judged as an error and the charging operation is forced to be stopped. (See Time ○ B in Fig.4.) If the START pin is changed from "L" to "H" and the UVLO detection is released, it restarts. STB S R Q LOGIC STB UVLO TSD S R OS VCC FULL UVLO Q VCC TSD PGND STB S R FULL OS Q VC VCC START ADJ FULL IGBT_IN GND VREF UVLO TSD START OFF time detection + MAX OFF TIME DRV + - 1/A + - GND VDD IGBT_EN SDP SDP SDP VC Anti- Ringing Filter UVLO_VDD MAXON MAX_ON SW SW IGBT_OUT_P VC PGND PGND IGBT_OUT_N MAX_ON *STB : Standby signal *OS : One shot pulse SW 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 Operation stop due to increase of chip temperature A B C D E F G H I t t t t t I(VBAT) V(cap) V(VC) V(START) Voltage at completion of charge UVLO detection voltage Operation restart due to decrease of chip temperature TSDP Hysterisis Operation stop due to UVLO detection Operation restart due to UVLO release |
Numéro de pièce similaire - BD4220AMUV |
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Description similaire - BD4220AMUV |
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