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NCP5425 Datasheet(PDF) 10 Page - ON Semiconductor |
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NCP5425 Datasheet(HTML) 10 Page - ON Semiconductor |
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10 / 22 page  NCP5425 http://onsemi.com 10 Current Sharing When used in a two separate input to a single output mode, the NCP5425 dual controller can provide input power sharing in either of two ways: • A preset ratio. For example, Channel 1 could provide 70% of the load current, and Channel 2, the remaining 30%. Practical ratios for Channel 1/Channel 2 contribution to total load current range from 50%−50% to 80%−20%. • A preset ratio up to a specific current contribution from Channel 2. In excess of that limit, all of the additional load current would be supplied by Channel 1. Figure 7 depicts the actual performance of a NCP5425 configured in a 70%−30% share ratio, with Channel 2 output current limited to 5.0 Amps. The availability both Channel 2 error amplifier inputs (signal and reference) at device pins is key to programmable current ratio sharing. Current sense information from Channel 1 is connected to the reference input of the Channel 2 error amplifier. Current information from Channel 2 is fed back to the error amplifier’s inverting input. Channel 2 will therefore act to adjust its current to match the current information fed to its reference input from Channel 1. If this information is one−half the voltage developed across the Channel 1 output inductor, Channel 2 will run at half the current and supply a approximately 33% of the total load current. This application is illustrated in Figure 7. In some applications the power supply designer may not only wish to draw a known percentage of power from one source, but also limit the power drawn from that source. The current limit amplifier on Channel 2 can be programmed to budget the maximum input power into Channel 2 and all power in excess of that limit will be supplied solely by Channel 1. This is accomplished by setting the Channel 2 cycle−by−cycle current limit in conjunction with programming the current ratio as described above. Figure 6. Two Phase Current Sharing Circuit Vin + − Master Error Amp U2 0.8 V Internal Reference VFB1 Q3 L1 R1 R C3 C R3 Vout R R4 R C1 C R1 R C3 C L2 C2 C R2 R R + − VFB2 VREF2 U2 Slave Error Amp Vin Q1 Q4 Q2 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 0 5 10 15 20 TOTAL OUTPUT CURRENT, AMPS Iin(1) Iin(2) Iout(1) Iout(2) Channel 2 output current begins to level off at 5 Amps Channel 1 output current share begins to increase Figure 7. 70%/30% Current Sharing with Channel 2 Current Limiting NOTE: Channel 1 input voltage = Channel 2 input voltage = 5.0 V Output voltage = 1.5 V |
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