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L5970D Datasheet(PDF) 11 Page - STMicroelectronics |
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L5970D Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 16 page L5970D Application ideas 11/16 6 Application ideas Figure 18. Dual output voltage with auxiliary winding Figure 19. Buck-boost regulator Figure 20. Positive Buck-Boost regulator Figure 21. Synchronization example VIN=12V C1 10uF 25V Ceramic D1 STPS25L25U VCC COMP GND OUT FB INH SYNC VREF L5970D 1 3 7 5 6 4 8 2 R3 4.7k U1 C3 22nF 3.3V VOUT=3.3V 0.5A C2 220pF VOUT1=5V 30mA C5 47uF 10V Lp=22uH D2 1N4148 C4 100uF 10V N1/N2=2 VIN=12V C1 10uF 25V Ceramic D1 STPS2L25U VCC COMP GND OUT FB INH SYNC VREF 1 3 7 5 6 4 8 2 R3 4.7k U1 L1 33uH 2.7k 24k C4 22nF 3.3V C5 100uF 16V L5970 VOUT=-12V/0.3A C3 220pF C2 10uF 35V Ceramic Vin=12V Vout=-12V Iout=0.5A Efficiency=81% VIN=5V C1 10uF 25V Ceramic D1 STPS2L25U VCC COMP GND OUT FB INH SYNC VREF L5970 1 3 7 5 6 4 8 2 R3 4.7k U1 L1 33uH 24k 2.7k C3 22nF 3.3V C4 100uF 16V VOUT=12V/0.3A C2 220pF D2 STPS2L25U M1 STN4NE03L Vin=5V Vout=12V Iout=0.3A Efficiency=76% VCC GND OUT FB INH SYNC VREF 1 3 7 5 6 4 8 2 L5970D COMP VCC GND OUT FB INH SYNC VREF 1 3 7 5 6 4 8 2 L5970D COMP VIN |
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