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參數(shù)資料
| 型號： | L6725TR |
| 廠商： | 意法半導體 |
| 英文描述： | Low cost adjustable step-down controller |
| 中文描述： | 低成本可調降壓控制器 |
| 文件頁數(shù)： | 16/27頁 |
| 文件大?。?/td> | 489K |
| 代理商： | L6725TR |
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Application details
L6725
16/27
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 sustain the output and the
input voltage variation 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 10
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 500KHz.
Increasing the value of the inductance reduces the ripple current 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 10. Inductor current ripple.
Vin
Vout
I
Fsw
Vout
Vin
L
L
(2)
0
1
2
3
4
5
6
7
8
0
1
2
3
4
OUTPUT VOLTAGE (V)
I
V in = 5 V , L = 5 00n H
V in = 5V , L = 1 .5u H
V in = 12 V , L = 2 u H
V in = 12 V , L = 1u H
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| L6731BTR | Transistor; Type: Amplifiers/Bipolar; VCEO (V): -25; Ic (A): -1; Pc (W): 0.8; hFE: 85 to 330; VCE (sat) (V) max: -0.5; Package: TO-92Mod |
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