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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN557 датащи(PDF) 46 Page - STMicroelectronics |
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AN557 датащи(HTML) 46 Page - STMicroelectronics |
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46 / 52 page  AN557 APPLICATION NOTE 46/52 CURRENT GENERATOR Often it is required to generate constant current , fixed or adjustable, for various applications, such as chem- ical process, lamp powering, battery charger for lead acids, ni-cd and ni-me-hyd batteries. Figure 65. Constant Current Generator and battery chargers. Figure 66. In this paragraph some suggestions will be given for how to abtain generators of constant current, more or less sophisticated according to the need. The examples given are time by time applicable to the differ- ent devices of this family of regulators, with the necessary adjustement according to the current required by the application. The diagram of fig. 66 propose a simple solution that makes use of two esternal small signal-transistor L4972A 11 7 8 R2 2.4K STPS640 30K 13 20 330 Ω 1K 220nF 1 9 150 µH 470 µF Vo=12V/1A 2200 µF Vi ≤40V D93IN003A 18 17 5 10K 0.1 µF Q2 Q1 R1 50 Ω Rsense 100m Ω Rx 100K OUTPUT STAGE PWM E/A + - 5.1 2 1 10 15 14 8 L4972A/74A 6 11 9 LM358 + - 100nF 100 4.7K 100 Rs V+ Iomax= V+ Rs V+= 5.1 100 100+4.7K ~100mV D93IN004 |
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