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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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A5974AD датащи(PDF) 11 Page - STMicroelectronics |
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A5974AD датащи(HTML) 11 Page - STMicroelectronics |
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11 / 49 page  A5974AD Functional description Doc ID 018762 Rev 1 11/49 5 Functional description The main internal blocks are shown in the device block diagram in Figure 3. They are: ● A voltage regulator supplying the internal circuitry. From this regulator, a 3.3 V reference voltage is externally available. ● A voltage monitor circuit which checks the input and the internal voltages. ● A fully integrated sawtooth oscillator with a frequency of 500 kHz ± 15%, including also the voltage feed-forward function and an input/output synchronization pin. ● Two embedded current limitation circuits which control the current that flows through the power switch. The pulse-by-pulse current limit forces the power switch OFF cycle- by-cycle, if the current reaches an internal threshold, while the frequency shifter reduces the switching frequency in order to significantly reduce the duty cycle. ● A transconductance error amplifier. ● A pulse width modulator (PWM) comparator and the relative logic circuitry necessary to drive the internal power. ● A high side driver for the internal P-MOS switch. ● An inhibit block for standby operation. ● A circuit to implement the thermal protection function Figure 3. Block diagram |
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