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参数资料
| 型号： | L5953 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A SWITCHING REGULATOR, 425 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封装： | LEAD FREE, SOP-36 |
| 文件页数： | 19/31页 |
| 文件大小： | 420K |
| 代理商： | L5953 |
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Application note
L5953
Part list on evaluation board
6.1
REG1 output voltage
VSTBY = 5V if pin ADJ left floating
VSTBY = 3.3V if pin ADJ is connected to the pin VSTBY
Timing capacitor
The value for this capacitor has to be chosen according the wanted power-on delay Td:
where ICT1 is the source current used to charge the timing capacitor and VSTBY is the REG1
output voltage.
6.2
Feedback resistors for REG2
where VLR is the required output voltage for REG2.
6.3
External components for PWM regulator
6.3.1
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 continuous mode. Continuous
mode operation is recommended in order to reduce the stress of the output capacitor and of
the free-wheeling diode.
6.3.2
Inductor selection
The minimum value of the inductor L7 has to be so that the maximum inductor current ripple
ΔI
L,max is 20% to 30% of the maximum load current load Io,max.The maximum ripple is
present when the switching frequency is minimum (fsw,min) and the input voltage is
maximum (Vin,max) so the minimum value for the inductor Lmin is:
C1 = 470
μF
C2 = 220 nF
C3 = 470
μF
C4 = 10
μFC5 = 1 μF
C6 = 100 nF
C7 = 470
μF
ESR=65 m
Ω
C8 = 56nF
C9 = 2.7 nF
C10 = 10
μF
C11 = 4.7 nF
R1 = 2.2 k
Ω
R2 = 2 x 1.5 k
Ω in
parallel
R3 = 10 k
Ω
R4 = 220 k
Ω
R5 = 3.3 k
Ω
R6 = 1 k
Ω
L1 = 180
μH
D1 = 1N4007 or
MBR160
D2 = MBR360
C11
I
CT1 Td
0.5 V
STBY
() V
CTLHy
+
----------------------------------------------------------------
=
R5
R6
V
LR
V
ref REG2
,
---------------------------- 1
–
=
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