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BD9888FV Datasheet(PDF) 3 Page - Rohm |
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BD9888FV Datasheet(HTML) 3 Page - Rohm |
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3 / 5 page  3/4 REV. A 〇Package Dimensions 〇Block Diagram 〇Pin Description Pin No. Pin Name Function 1 DUTY Control PWM mode and BURST mode 2 BRT External resistor from BRT to GND for adjusting the BURST triangle oscillator 3 BCT External capacitor from BCT to GND for adjusting the BURST triangle oscillator 4 RT External resistor from SRT to RT for adjusting the triangle oscillator 5 SRT External resistor from SRT to RT for adjusting the triangle oscillator 6 CT External capacitor from CT to GND for adjusting the triangle oscillator 7 GND GROUND 8 FB1 Error amplifier output① 9 IS1 Error amplifier input① 10 VS1 Error amplifier input② 11 FB2 Error amplifier output② 12 IS2 Error amplifier input③ 13 VS2 Error amplifier input④ 14 VREF Reference voltage 15 COMPA1 Voltage difference or under voltage detect for 1ch 16 STB Stand-by switch 17 COMPB1 Voltage difference or under voltage detect for 1ch 18 COMPA2 Voltage difference or under voltage detect for 2ch 19 COMPB2 Voltage difference or under voltage detect for 2ch. 20 REG Internal regulator output 21 SS External capacitor from SS to GND for Soft Start Control 22 SCP External capacitor from SCP to GND for Timer Latch 23 NA2 FET driver for 2ch 24 NB2 FET driver for 2ch 25 PGND Ground for FET drivers 26 NB1 FET driver for 1ch 27 NA1 FET driver for 1ch 28 Vcc Supply voltage input BD9888FV BD9888F Lot No. Device Mark (Include BURR 10.35) (Include BURR 18.85) SSOP-B28 (unit:mm) SOP28 (unit:mm) STB BLOCK SYSTEM ON/OFF OSC BOSC CT VCC RT BRT BCT DUTY NA1 NB1 STB IS1 DUTY BLOCK REG BLOCK UVLO BLOCK VCC REG VREF F/B BLOCK① PWM BLOCK① LOGIC BLOCK ① OUTPUT BLOCK① SS CT VS1 SS FB1 NA2 NB2 IS2 F/B BLOCK② PWM BLOCK② LOGIC BLOCK ② OUTPUT BLOCK② SS CT VS2 FB2 PROTECT BLOCK GND PGND SCP SRT VCC VCC COMP BLOCK VOLTAGE DIFFERENCE DETECT BLOCK ① VOLTAGE DIFFERENCE DETECT BLOCK ② COMPA1 COMPB1 COMPA2 COMPB2 |
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