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LM2590HV Datasheet(PDF) 17 Page - Texas Instruments |
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LM2590HV Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 22 page  Application Information (Continued) lNVERTING REGULATOR The circuit in Figure 10 converts a positive input voltage to a negative output voltage with a common ground. The circuit operates by bootstrapping the regulator’s ground pin to the negative output voltage, then grounding the feedback pin, the regulator senses the inverted output voltage and regu- lates it. This example uses the LM2590HV-5 to generate a −5V output, but other output voltages are possible by selecting other output voltage versions, including the adjustable ver- sion. Since this regulator topology can produce an output voltage that is either greater than or less than the input voltage, the maximum output current greatly depends on both the input and output voltage. To determine how much load current is possible before the internal device current limit is reached (and power limiting occurs), the system must be evaluated as a buck-boost configuration rather than as a buck. The peak switch current in Amperes, for such a configuration is given as: where L is in µH and f is in Hz. The maximum possible load current I LOAD is limited by the requirement that IPEAK ≤ ICLIM. While checking for this, take I CLIM to be the lowest possible current limit value (min across tolerance and temperature is 1.2A for the LM2590HV). Also to account for inductor toler- ances, we should take the min value of Inductance for L in the equation above (typically 20% less than the nominal value). Further, the above equation disregards the drop across the Switch and the diode. This is equivalent to as- 10134742 FIGURE 9. Typical Circuit Using Shutdown /Soft-start and Error Flag Features 10134743 FIGURE 10. Inverting −5V Regulator With Shutdown and Soft-start www.national.com 16 |
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