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L6731D Datenblatt(PDF) 10 Page - STMicroelectronics |
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L6731D Datenblatt(HTML) 10 Page - STMicroelectronics |
10 / 23 page Device description L6731D 10/23 5 Device description 5.1 Oscillator The switching frequency can be fixed to two values: 250 kHz or 500 kHz by setting the proper voltage at the EAREF pin (see Table 4. Pins function and section 4.3 Internal and external reference). 5.2 Internal LDO An internal LDO supplies the internal circuitry of the device. The input of this stage is the VCC pin and the output (5 V) is the VCCDR pin (Figure 3.). The LDO can be by-passed, providing directly a 5 V voltage to VCCDR. In this case VCC and VCCDR pins must be shorted together as shown in Figure 4. VCCDR pin must be filtered with at least 1 µF capacitor to sustain the internal LDO during the recharge of the bootstrap capacitor. VCCDR also represents a voltage reference for PGOOD pin (see Table 4. Pins Function). Figure 3. LDO block diagram LDO 4.5V ÷14V |
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Ähnliche Beschreibung - L6731D |
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