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參數(shù)資料
| 型號： | L5953 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | MULTIPLE SWITCHING VOLTAGE REGULATOR |
| 中文描述： | 多重開關(guān)穩(wěn)壓 |
| 文件頁數(shù)： | 20/24頁 |
| 文件大小： | 217K |
| 代理商： | L5953 |
L5953
20/24
PART LIST on Evaluation Board
REG1
OUTPUT VOLTAGE
V
STBY
= 5V if pin ADJ left floating
V
STBY
= 3.3V if pin ADJ is conneted to the pin V
STBY
Timing Capacitor
The value for this capacitor has to be chosen according the wanted power-on delay T
d
:
where I
CT1
is the source current used to charge the timing capacitor and V
STBY
is the REG1 output voltage.
Feedback resistors for REG2
where VLR is the required output voltage for REG2.
External components for PWM regulator
Bootstrap capacitor
The suggested value for the bootstrap capacitor is C6 = 100nF
Here following you find the criteria for the selection of the inductor L1, the free-wheeling diode D2, the output
filter capacitor C7, the feedback resistor R1, R2 and the compensation network R3, C8, R4, C9 to have a Buck
regulator working in Continuos mode. Continuous mode operation is recommended in order to reduce the stress
of the output capacitor and of the free-wheeling diode.
Inductor Selection
The minimum value of the inductor L7 has to be so that the maximum inductor current ripple
I
L,max
is 20% to
30% of the maximum load current load I
o,max
.The maximum ripple is present when the switching frequency is
minimum ( f
sw,min
) and the input voltage is maximum ( V
in,max
) so the minimum value for the inductor L
min
is :
Output Capacitor Selection
The criteria for the selection of the capacitor C7 is based on the output voltage ripple requirements. The ripple
on the output voltage is due to a capacitive contribute, often negligible, equal to
C1 = 470
μ
F
C2 = 220 nF
C3 = 470
μ
F
C4 = 10
μ
F
C5 = 1
μ
F
C6 = 100 nF
C7 = 470
μ
F
ESR=65 m
C8 = 56nF
C9 = 2.7 nF
C10 = 10
μ
F
C11 = 4.7 nF
R1 = 2.2 k
R2 = 2 x 1.5 k
in parallel
R3 = 10 k
R4 = 220 k
R5 = 3.3 k
R6 = 1 k
L1 = 180
μ
H
D1 = 1N4007 or
MBR160
D2 = MBR360
C11
I
T
0.5 V
STBY
(
V
CTLRy
+
-------------------------------------------------------------
=
R5
R6
V
V
ref REG2
,
--------------------------
1
–
=
L
min
V
I
L max
,
--------------------
1
V
V
i max
,
----------------
f
sw min
,
------------------
–
=
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