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参数资料
| 型号： | L6726ATR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 297 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 14/35页 |
| 文件大小： | 986K |
| 代理商： | L6726ATR |
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L6726A
Application Information
Doc ID 12754 Rev 4
21/35
9
Application Information
9.1
Output inductor
Inductor value is defined by a compromise between dynamic response, ripple, efficiency,
cost and size. Usually, inductance is calculated to maintain inductor ripple current (
ΔI
L)
between 20% and 30% of maximum output current. Given the switching frequency (FSW),
the input voltage (VIN), the output voltage (VOUT) and the desired ripple current (ΔIL),
inductance can be calculated as follows:
Figure 12 shows the ripple current vs. the output voltage for different inductance, with
VIN = 5 V and VIN = 12 V.
Increasing inductance reduces inductor ripple current (and output voltage ripple
accordingly) but, at the same time, increases the converter response time to load transients.
Higher inductance means that the inductor needs more time to change its current from initial
to final value. Until the inductor has not finished its charging, the additional output current is
supplied by output capacitors. Minimizing the response time lead to minimize the output
capacitance required. If the compensation network is designed with high bandwidth, during
an heavy load transient the device is able to saturate duty cycle (0% or 80%). When this
condition is reached, the response time is limited only by the time required to charge the
inductor.
Figure 12.
Inductor current ripple vs output voltage
L
V
IN
V
OUT
–
F
SW
ΔI
L
------------------------------
V
OUT
V
IN
--------------
=
0
2
4
6
8
10
12
0
1234
5
In
d
u
c
to
r
cu
rr
e
n
t
ri
p
le
[A
]
Ou tp u t vo ltag e [V ]
Vin=12V, L=1 uH
Vin=12V, L=2 uH
Vin=5V, L=50 0nH
Vin=5V, L=1.5uH
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相关代理商/技术参数 |
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|---|---|
| L6726-D18-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
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| L6726G-S18-R | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726G-S18-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726L-D18-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
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