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BD8179MUV Datasheet(PDF) 6 Page - Rohm |
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BD8179MUV Datasheet(HTML) 6 Page - Rohm |
6 / 13 page BD8179MUV Technical Note 6/12 www.rohm.com 2009.07 - Rev.B © 2009 ROHM Co., Ltd. All rights reserved. ● Block Function Step-up Controller A controller circuit for DC/DC boosting. The switching duty is controlled so that the feedback voltage FB is set to 1.233 V (typ.). A soft start operates at the time of starting. Gate-on Controller A controller circuit for the positive-side charge pump. The liner regulator controls so that the feedback voltage FBP will be set to 1.25 V (typ.). Gate-off Controller A controller circuit for the negative-side charge pump. The liner regulator controls so that the feedback voltage FBN will be set to 0.25 V (Typ.). Gate Shading Controller A controller circuit for MOS FET Switch The COM switching synchronize with CTL input. Start-up Controller A control circuit for the starting sequence. Controls to start in order of VCC VMAIN VGOFF/VGONVCOM REF A block that generates internal reference voltage. 1.25V (Typ.) is output. TSD/UVLO/OVP Thermal shutdown/Under-voltage lockout protection/circuit blocks. The thermal shutdown circuit is shut down at an IC internal temperature of 175°C and reactivate at 160°C. The under-voltage lockout protection circuit shuts down the IC when the VIN is 2.4 V (typ.) or below. The over-voltage lockout protection circuit shuts down the IC when the SUP is 19.0 V (typ.) or over. OP1~OP5 Operational amplifier block ● Starting sequence ① UVLO released when VIN voltage reaches 2.4V ② Step up DCDC converter starts switching, and VGON and VGOFF starts. ③ VDEL starts. ④ VCOM ON when VDEL reaches 1.25V ① ② ③ ④ VIN VMAIN VGON/VGOFF VDEL VCOM 3.25ms 15ms 2.4 1.25V VGON VGOFF |
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