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LTM8056 Folha de dados(PDF) 13 Page - Linear Technology |
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LTM8056 Folha de dados(HTML) 13 Page - Linear Technology |
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13 / 28 page  LTM8056 13 8056fa For more information www.linear.com/LTM8056 APPLICATIONS INFORMATION LTM8056 if the output is overloaded or short circuited. A frequency that is too low can result in a final design that has too much output ripple or too large of an output capacitor or is even unstable. Parallel Operation Two or more LTM8056s may be combined to provide increased output current by configuring them as a mas- ter and a slave, as shown in Figure 1. Each LTM8056 is equipped with an IOUTMON and a CTL pin. The IOUTMON pin’s0Vto1.2Vsignalreflectsthecurrentpassingthrough the output sense resistor, while a voltage less than 1.2V appliedtotheCTLpinwilllimitthecurrentpassingthrough the output sense resistor. By applying the voltage of the master’s IOUTMON pin to the slave’s CTL pin, the two units will source the same current to the load, assuming each LTM8056 output current sense resistor is the same value. 2. Apply a FB resistor network to the individual slaves so that the resulting output is higher than the desired output voltage. 3. Apply the appropriate output current sense resistors between VOUT and IOUT. If the same value is used for the master and slave units, they will share current equally. 4. Connect the master IOUTMON to the slaves’ CTL pin through a unity gain buffer. The unity gain buffer is requiredtoisolatetheoutputimpedanceoftheLTM8056 from the integrated pull-up on the CTL pins. 5. Tie the outputs together. Note that this configuration does not require the inputs to be tied together, making it simple to power a single heavy load from multiple input sources. Ensure that each input power source has sufficient voltage and current sourcing capability to provide the necessary power. Please refer to the Maximum Output Current vs VIN and Input Current vs Output Current curves in the Typical Performance Characteristics section for guidance. ParalleledLTM8056sshouldnormallybeallowedtoswitch in discontinuous mode enabled to prevent current from flowing from the output of one unit into another; that is, the MODE pin should be tied to LL. In some cases, operat- ing the master in forced continuous (MODE open) and the slaves in discontinuous mode (MODE = LL) is desirable. If so, current from the output can flow into the master’s input. Please refer to Input Precaution in this section for a discussion of this behavior. Minimum Input Voltage and RUN The LTM8056 needs a minimum of 5V for proper opera- tion, but system parameters may dictate that the device operate only above some higher input voltage. For ex- ample, a LTM8056 may be used to produce 12VOUT, but the input power source may not be budgeted to provide enough current if the input supply voltage is below 8V. The RUN pin has a typical falling voltage threshold of 1.2V and a typical hysteresis of 25mV. In addition, the pin sinks 3µA below the RUN threshold. Based upon the Figure 1. Two or More LTM8056s May Be Connected in a Master/Slave Configuration for Increased Output Current IOUT MASTER IOUTMON OUTPUT CURRENT SENSE RESISTOR TO LOAD VOUT IOUT CTL SLAVE VOUT UNITY GAIN BUFFER 8056 F01 OUTPUT CURRENT SENSE RESISTOR The design of a master-slave configuration is straight- forward: 1. Apply the FB resistor network to the master, choosing the proper values for the desired output voltage. Sug- gested values for popular output voltages are provided in Table 1. |
Nº de peça semelhante - LTM8056 |
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Descrição semelhante - LTM8056 |
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