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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6986I датащи(PDF) 42 Page - STMicroelectronics |
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L6986I датащи(HTML) 42 Page - STMicroelectronics |
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42 / 60 page  7 Application example The target of this section is to show a typical application example as well as to describe the expected performances. The schematic below depicts a typical application where an isolated voltage (single) together with a not isolated voltage is required. Figure 49. Typical schematic with load applied to both the isolated and not isolated outputs signal GND power GND T1 CCOMP COUT_pri CIN VOUT_sec+ CSS VIN CP R2 CIN R1 D1 L6986I RST 1 VCC 2 SS/INH 3 SYNCH 4 FSW 5 MLF 6 COMP 7 DELAY 8 FB 9 SGND 10 PGND 11 PGND 12 LX 13 LX 14 VIN 15 VBIAS 16 EP 17 VOUT_pri RCOMP CVCC COUT_sec VOUT_sec- R8 C15 LOAD (isolation required) LOAD (isolation not required) GND GND signal GND power GND T1 CCOMP COUT_pri CIN VOUT_sec+ CSS VIN CP R2 CIN R1 D1 RST 1 VCC 2 SS/INH 3 SYNCH 4 FSW 5 MLF 6 COMP 7 DELAY 8 FB 9 SGND 10 PGND 11 PGND 12 LX 13 LX 14 VIN 15 VBIAS 16 EP 17 VOUT_pri RCOMP CVCC COUT_sec VOUT_sec- R8 C15 LOAD (isolation required) LOAD (isolation not required) 10 mF 470nF 68nF 56k W 4.7pF 680pF 10 mF 10.6k W 2.2k W 10 mF 620 W 82pF 100nF 2106.0007 This application generates 5 V at the primary output (not isolated) with a switching frequency of 500 kHz. The secondary voltage (isolated) is generated by a transformer with a turn ratio 1:5.6. The voltage between VOUT_sec+ and VOUT_sec- changes with the current drawn from the load. A post-regulation is necessary to keep this voltage stable maximum deliverable current in an iso-buck topology must take into account the equations (5) and (6). According to how much current is drawn from the isolated and not isolated outputs, IPEAKHS or IPEAKLS is the most stringent parameter. Considering the schematic above and the components included, the graph below gives an idea about how much current, under these application conditions, can be drawn at the same time from the not isolated and isolated outputs, with different input voltages. Figure 50. Maximum deliverable currents to the isolated and not isolated outputs 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 1 10 100 1000 IOUT_prim [mA] VIN = 9 V VIN = 12 V VIN = 18 V VIN = 24 V L6986I Application example DS13647 - Rev 1 page 42/60 |
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