參數(shù)資料
型號: L6730TR
廠商: 意法半導(dǎo)體
英文描述: Adjustable step-down controller with synchronous rectification
中文描述: 可調(diào)式降壓同步整流控制器
文件頁數(shù): 14/52頁
文件大小: 1370K
代理商: L6730TR
Device description
L6730 - L6730B
14/52
5.2
Internal LDO
An internal LDO supplies the internal circuitry of the device. The input of this stage is the V
CC
pin and the output (5V) is the V
CCDR
pin (see
Figure 4.
).
5.3
Bypassing the LDO to avoid the voltage drop with low Vcc
The LDO can be by passed by providing 5V voltage directly to V
CCDR
. In this case Vcc and
V
CCDR
pins must be shorted together as shown in
Figure 5.
V
CCDR
pin must be filtered
with at
least 1
μ
F capacitor to sustain the internal LDO during the recharge of the bootstrap capacitor.
V
CCDR
also represents a voltage reference for Tmask pin, S/O/U pin (L6730) or CC/O/U pin
(L6730B) and PGOOD pin (see
Table 3: Pins connection
).
If Vcc
5V the internal LDO works in dropout with an output resistance of about 1
.
The maximum LDO output current is about 100mA, and so the output voltage drop can be
100mV.
The LDO can be bypassed to avoid this.
Figure 4.
LDO block diagram.
Figure 5.
Bypassing the LDO
LDO
4.5V
÷
14V
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