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L6732 bảng dữ liệu(PDF) 11 Page - STMicroelectronics

tên linh kiện L6732
Giải thích chi tiết về linh kiện  Adjustable step-down controller with synchronous rectification
PDF  37 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L6732 bảng dữ liệu(HTML) 11 Page - STMicroelectronics

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L6732
Device description
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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
4.5
÷14V



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