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BA30E00WHFP-TR Scheda tecnica(PDF) 11 Page - Rohm |
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BA30E00WHFP-TR Scheda tecnica(HTML) 11 Page - Rohm |
11 / 19 page 11/16 BA3259HFP BA30E00WHFP Datasheet TSZ02201-0R6R0A600100-1-2 26.Jun.2012 Rev.001 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Application Information ●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 (0.05µA typ.: BA3259HFP) (0.2µA typ.: BA30E00WHFP) Note:Connect R1 and R2 to make output voltage settings as shown in Fig.1and Fig.2. 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. ●Function Explanation 1) Two-input power supply (BA30E00WHFP) The input voltages (Vcc1 and Vcc2) supply power to two outputs (Vo1 and Vo2, respectively). The power dissipation between the input and output pins can be suppressed for each output according to usage. 2) Standby function (BA30E00WHFP) The standby function is operated through the EN pin. Output is turned on at 2.0 V or higher and turned off at 0.8 V or lower. ●Power Dissipation If the IC is used under the conditions of excess of the power dissipation, the chip temperature will rise, which will have an adverse effect on the electrical characteristics of the IC, such as a reduction in current capability. Furthermore, if the temperature exceeds Tjmax, element deterioration or damage may occur. Implement proper thermal designs to ensure that the power dissipation is within the permissible range in order to prevent instantaneous IC damage resulting from heat and maintain the reliability of the IC for long-term operation. Refer to the power derating characteristics curves in Fig.27. ・Power Consumption Pc (W) Calculation Method: ○BA3259HFP ○BA30E00WHFP 5V Vcc Vo1 Vo2 REG1 REG2 3.3 V/0.3 A 1.8 V/0.3 A Power loss between input and output (Vcc − Vo1) × Io1 + (Vcc − Vo2) × Io2 = (5 − 3.3) × 0.3 + (5 − 1.8) × 0.3 = 0.51W + 0.96W = 1.47W → Single 5V input results in decreased efficiency Power loss between input and output (Vcc1 − Vo1) × Io1 + (Vcc2 − Vo2) × Io2 = (5 − 3.3) × 0.3 + (5 − 1.8) × 0.3 = 0.51W + 0.36W = 0.87W Reduced power loss by 0.6W. → Additional 3V input improves efficiency 5V Vcc Vo1 Vo2 REG1 REG2 3V 3.3 V/0.3 A 1.8 V/0.3 A Conventional Efficiency comparison: 5V single input vs. 5V/3V two inputs •Regulator with single input and two outputs •Regulator with two inputs and two outputs (Vo2=1.8V, Io1=Io2=0.3A) Current Vcc GND Vo1 Vo2 Controller Icc IP Vcc Vcc Io1 Io2 3.3 V output 0.8 V to 3.3 V output Power Tr Power Tr Vcc1 GND Io1 Io2 Controller Icc1+Icc2 Vcc1 Vcc2 Io1 Io2 3.3 V output 0.8 V to 3.3 V output Vcc2 IB1 IB2 Power Tr Power Tr • Power consumption of power transistor on Vo1 (3.3 V output) Pc1=(Vcc1 − Vo1) × Io1 • Power consumption of power transistor on Vo2 (variable output ) Pc2=(Vcc2 − Vo2) × Io2 • Power consumption by circuit current Pc3=Vcc1 × Icc1 + Vcc2 × Icc2 Pc=Pc1 + Pc2 + Pc3 * Vcc1, Vcc2: Applied voltage Io1: Load current on 3.3 V output side Io2: Load current on variable output side Icc1, Icc2: Circuit currents • Power consumption of 3.3 V power transistor Pc1=(Vcc − 3.3) × Io1 • Power consumption of Vo2 power transistor Pc2=(Vcc − Vo2) × Io2 • Power consumption by circuit current Pc3=Vcc × Icc Pc=Pc1 + Pc2 + Pc3 * Vcc: Applied voltage Io1: Load current on Vo1 side Io2: Load current on Vo2 side Icc: Circuit current R1 BA3259HFP: 1 kΩ to 10 kΩ BA30E00HFP: 1 kΩ to 5 kΩ The above is recommended. Vo2 ADJ IADJ VADJ R2 R1 |
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