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L6382D5TR датащи(PDF) 11 Page - STMicroelectronics |
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L6382D5TR датащи(HTML) 11 Page - STMicroelectronics |
11 / 21 page L6382D5 Application information 11/21 5 Application information 5.1 Power management The L6382D5 has two stable states (save mode and operating mode) and two additional states that manage the Start-up and fault conditions: the Over Current Protection is a parallel asynchronous process enabled when in operating mode Figure 4. Following paragraphs will describe each mode and the condition necessary to shift between them. Figure 4. State diagram 5.2 START-UP mode With reference to the timing diagram of figure 6, when power is first applied to the converter, the voltage on the bulk capacitor (Vin) builds up and the HV generator is enabled to operate drawing about 10mA. This current, diminished by the IC consumption (less than 150µA), charges the bypass capacitor connected between pin Vcc and ground and makes its voltage rise almost linear. During this phase, all IC's functions are disabled except for: ● the current sinking circuit on VREF pin that maintains low the voltage by keeping disabled the microcontroller connected to this pin; ● the High-Voltage Start-Up (HVSU) that is ON (conductive) to charge the external capacitor on pin Vcc. As the Vcc voltage reaches the start-up threshold (14V typ.) the chip starts operating and the HV generator is switched off. SAVE MODE OPERATING MODE SHUT DOWN V CC>VCC(ON) V CC<VREF(OFF) V REF>4.6V & T DE>10µs LGI low for more than 100 µs START-UP V CC < VCC(OFF) or V REF<3.2V V CC<VCC(ON) V CC<VREF(OFF) |
Аналогичный номер детали - L6382D5TR |
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Аналогичное описание - L6382D5TR |
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