参数资料
型号: L6730TR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
封装: HTSSOP-20
文件页数: 7/52页
文件大小: 1569K
代理商: L6730TR
L6730 - L6730B
Device description
Doc ID 11938 Rev 3
15/52
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 (see Figure 5).
5.3
Bypassing the LDO to avoid the voltage drop with low Vcc
The LDO can be by passed by providing 5 V voltage directly to VCCDR. In this case Vcc and
VCCDR pins must be shorted together as shown in Figure 6. 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 Tmask pin, S/O/U pin (L6730) or
CC/O/U pin (L6730B) and PGOOD pin (see Table 4: Pin connection).
If Vcc
5 V the internal LDO works in dropout with an output resistance of about 1 .
The maximum LDO output current is about 100 mA, and so the output voltage drop can be
100 mV. The LDO can be bypassed to avoid thi
s.
Figure 5.
LDO block diagram
LDO
4.5V
÷14V
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