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BA3259HFP 데이터시트(PDF) 5 Page - Rohm |
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BA3259HFP 데이터시트(HTML) 5 Page - Rohm |
5 / 10 page BA3259HFP,BA30E00WHFP Technical Note 5/9 www.rohm.com 2009.04 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. VREF Current Limit Thermal Shutdown Current Limit V O1 V O2 GND 3.3V 1μF 1.5V 1μF 3.3μF V IN C O1 C O2 C IN 1 5 4 FIN 2 ADJ Vcc R1 R2 3 GND Block Diagrams / Standard Example Application Circuits Fig.25 BA3259HFP Block Diagram Fig.26 BA30E00WHFP Block Diagram Pin No. Pin name Function Pin No. Pin name Function 1 Vcc Power supply pin 1 EN Output on/off control pin: High active 2 ADJ Variable output voltage detection pin 2 Vcc2 Power supply pin 2 3 GND GND pin 3 Vcc1 Power supply pin 1 4 Vo2 Variable output pin 4 GND GND pin 5 Vo1 3.3 V output pin 5 Vo1 Power supply pin for 3.3 V output FIN GND GND pin 6 Vo2 Variable output voltage detection pin (0.8 V to 3.3 V) 7 ADJ Variable output voltage detection pin FIN GND GND pin TOP VIEW TOP VIEW HRP5 HRP7 Setting the Output Voltage Vo2 The following output voltage setting method applies to the variable output pin. Vo2=VADJ ( 1 + R2 ) - R2 IADJ R1 VADJ: Output feedback reference voltage (0.8 V typ.) IADJ: ADJ pin source current (0.05 A typ.: BA3259HFP) (0.2 A typ.: BA30E00WHFP) Note:Connect R1 and R2 to make output voltage settings as shown in Fig.25 and Fig.26. Keep in mind that the offset voltage caused by the current (IADJ) flowing out of the ADJ pin will become high if higher resistance is used. Vo2 ADJ IADJ VADJ R2 R1 R1 BA3259HFP: 1 k to 10 k BA30E00HFP: 1 k to 5 k The above is recommended. EN Current Limit Sat. Prevention Current Limit Sat. Prevention Thermal Shut Down GND(Fin) Vcc1 Vcc1 Vcc2 Vcc2 Vcc1 ADJ GND Vo2 Vo1 Vcc2 Reference Voltage R1 R2 47μF 47μF 1μF 1μF 1 2 3 4 5 6 7 PIN External capacitor setting range Vcc (1Pin) Approximately 3.3 F Vo1 (5Pin) 1 F to 1000 F Vo2 (4Pin) 1 F to 1000 F PIN External capacitor setting range Vcc1 (3Pin) Approximately 1 F Vcc2 (2Pin) Approximately 1 F Vo1 (5Pin) 47 F to 1000 F Vo2 (6Pin) 47 F to 1000 F 1 2 3 4 5 1 2 3 4 5 6 7 |
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