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L4921 Datasheet(PDF) 4 Page - STMicroelectronics |
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L4921 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 7 page Figure 3 : Quiescent Current vs. Output Current (Vo = 5V). APPLICATION INFORMATION 1) The L4920 and L4921 have VREF ≅ 1.25V.Then the output voltage can be set down to VREF but Vi must be greater than 5.2V (Tj =25 °C). 2) As the regulator reference voltage source works in closed loop, the reference voltage may change in foldbackcondition. 3) For applications with high Vl, the total power dissipation of the device with respect to the ther- mal resistance of the package may be limiting . The total power dissipation is : Ptot =Vi lq +(Vi -Vo)lo A typical curve giving the quiescent current lq as a function of the output current lo is shown in fig. 3. Figure 1 : Output Voltage vs. Temperature. Figure 2 : Foldback Current Limiting. L4920/L4921 4/7 |
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