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STCC02-E Scheda tecnica(PDF) 3 Page - STMicroelectronics |
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STCC02-E Scheda tecnica(HTML) 3 Page - STMicroelectronics |
3 / 13 page STCC02-ED5 3/13 Its output voltage accuracy, that contributes to the ADC accuracy of the MCU, is better than ± 10 % in the whole operating range of the temperature TAMB, the load current IDD and the input voltage VIN. The STCC02 input voltage range from 7 to 27 V; and its DC output current is less than 20 mA to keep the inter- nal dissipation compatible with thermal package capability. The regulator includes also an over current limiter to prevent high current conditions during the power up inrush or the output short circuit. This limiter is made of a serial shunt resistance as current sensor and a circuit that regulates the input over current. ■ The reset circuit This circuit ensures a Low Voltage Detection (LVD) of the output voltage of the regulator. Most micro- controllers have an active RESET pin in the low state: so, the /RST pin will be active at low state. The reset circuit senses the regulator voltage VDD. Its comparator with hysteresis achieves this task. The /RST pin is high when VDD is higher than the high threshold VH = 4.25 V; and is low when the VDD decreases below the low threshold VL = 3.75 V. The comparator output changes are filtered for a high immunity. When the reset is disabling (VDD > VH), the /RST signal rises after the delay time TUP. This delay is set by an external capacitor CUP connected to the DLC pin: TUP = 6 ms for CUP = 47 nF. When the reset is enabling (VDD < VL), the /RST signal is falling after a delay time TDW that is internally set at 40 µs when CUP = 47 nF. ■ The Zero Voltage Synchronization ZVS Circuit DLC If C = 47 nF, T = 6 ms UP UP External Capacitor CUP /RST PROGRAMMABLE DELAY NOISE FILTER VDD VDD VH V = 4.25 V H 500 Ω VL V = 3.75 V L T DW ~ 40 µs V DD circuit output internal latch output T UP = 6 ms C UP = 47 nF RST\ T DW ~ 40 µs V DD circuit output internal latch output T UP = 6 ms C UP = 47 nF RST\ VCC VDD ZVS VZVS VTF COM 100 k Ω 500 Ω 25 k Ω SYN 20 µs Filter RZV AC LINE Q S2 S1 |
Codice articolo simile - STCC02-E |
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Descrizione simile - STCC02-E |
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