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L5973AD Datasheet(PDF) 9 Page - STMicroelectronics |
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L5973AD Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 14 page 9/14 L5973AD 4.3 ZERO LOAD Due to the fact that the internal power is a PDMOS, no boostrap capacitor is required and so, the device works prop- erly also with no load at the output. In this condition it works in burst mode, with random repetition rate of the burst. 4.4 APPLICATION CIRCUIT In figure 9 is shown the demo board application circuit, where the input supply voltage, Vcc, can range from 4.4V to 25V due to the rated voltage of the input capacitor and the output voltage is adjustable from 1.235V to Vcc. Figure 9. Demo board Application Circuit Table 6. Component List Reference Part Number Description Manufacturer C1 10 µF, 25V TOKIN C2 POSCAP 6TPB330M 330 µF, 6.3V Sanyo C3 C1206C221J5GAC 220pF, 5%, 50V KEMET C4 C1206C223K5RAC 22nF, 10%, 50V KEMET R1 5.6K, 1%, 0.1W 0603 Neohm R2 3.3K, 1%, 0.1W 0603 Neohm R3 4.7K, 1%, 0.1W 0603 Neohm D1 STPS2L25U 2A, 25V ST L1 DO3316P-153 15 µH, 3A COILCRAFT D03IN1454 8 4 5 1 7 L5973AD C1 10 µF 25V CERAMIC C2 330 µF 6.3V VOUT=3.3V VIN = 4.4V to 25V R1 5.6K R2 3.3K R3 4.7K C4 22nF C3 220pF 3 L1 15 µH D1 STPS2L25U COMP VCC OUT FB GND INH 2 6 3.3V SYNC. VREF |
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