參數(shù)資料
型號(hào): L6730BTR
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(yè)數(shù): 33/52頁(yè)
文件大?。?/td> 1370K
代理商: L6730BTR
L6730 - L6730B
Application details
33/52
6
Application details
6.1
Inductor design
The inductance value is defined by a compromise between the transient response time, the
efficiency, the cost and the size. The inductor has to be calculated to maintain the ripple current
(
I
L
) between 20% and 30% of the maximum output current. The inductance value can be
calculated with the following relationship:
Where F
SW
is the switching frequency, V
IN
is the input voltage and V
OUT
is the output voltage.
Figure 27.
shows the ripple current vs. the output voltage for different values of the inductor,
with V
IN
= 5V and V
IN
= 12V at a switching frequency of 400kHz.
Increasing the value of the inductance reduces the current ripple but, at the same time,
increases the converter response time to a load transient. If the compensation network is well
designed, during a load transient the device is able to set the duty cycle to 100% or to 0%.
When one of these conditions is reached, the response time is limited by the time required to
change the inductor current. During this time the output current is supplied by the output
capacitors. Minimizing the response time can minimize the output capacitor size.
Figure 27. Inductor current ripple.
Vin
Vout
I
Fsw
Vout
Vin
L
L
(6)
0
1
2
3
4
5
6
7
8
0
1
2
3
4
OUTPUT VOLTAGE (V)
I
V in = 5 V , L = 5 0 0 n H
V in = 5 V , L = 1 .5 u H
V in = 1 2 V , L = 2 u H
V in = 1 2 V , L = 1 u H
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