參數(shù)資料
型號: L6725TR
廠商: 意法半導(dǎo)體
英文描述: Low cost adjustable step-down controller
中文描述: 低成本可調(diào)降壓控制器
文件頁數(shù): 12/27頁
文件大?。?/td> 489K
代理商: L6725TR
Device description
L6725
12/27
5.5
Error amplifier
5.6
Soft start
When both V
CC
and V
IN
are above their turn-ON thresholds (V
IN
is monitored by the OCH pin)
the start-up phase takes place. Otherwise the SS pin is internally shorted to GND. At start-up, a
ramp is generated charging the external capacitor C
SS
with an internal current generator. The
initial value for this current is 35μA and charges the capacitor up to 0.5V. After that it becomes
10μA until the final charge value of approximately 4V (see
Figure 5.
).
Figure 4.
Error amplifier reference
Figure 5.
Soft-Start phase.
t
t
0.5V
4V
Vcc
Vn
Vss
4.2V
1.25V
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