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| 型号： | TPS53126PWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.17 A DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | PLASTIC, TSSOP-24 |
| 文件页数： | 13/30页 |
| 文件大小： | 899K |
| 代理商： | TPS53126PWR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
DRVH2
VBST2
EN2
SW1
DRVL1
DRVH1
VBST1
EN1
V
F
B
2
V
O
2
V
O
1
V
F
B
1
G
N
D
PGND2
PGND1
DRVL2
SW2
Input Voltage
PGND
SGND
24
22
23
19
20
21
13
14
15
16
17
18
8
9
10
11
12
7
1
2
3
4
5
6
PGND
SGND
T
E
S
T
1
T
E
S
T
2
T
R
IP
2
V
5
F
IL
T
V
R
E
G
5
V
IN
T
R
IP
1
4.5V to 24V
C9
10 F
m
C4
22 F
4
m
C1
22 F
4
m
VO2
1.05V/4A
C6
10 F
m
Q3
FDS8878
L2
SPM6530T
1.5 H
m
Q4
FDS8690
C5
0.1 F
m
R4
3.52kW
R5
10kW
R2
10kW
R1
13kW
R6
3.3kW
C8
1 F
m
C7
4.7 F
m
R3
4.7kW
VO1
1.8V/4A
C3
10 F
m
Q1
FDS8878
L1
SPM6530T
1.5 H
m
Q2
FDS8690
C2
0.1 F
m
PowerPAD
TPS53126
RGE
(QFN)
(
)
(
)
IN(max)
L1(ripple)
IN(max)
V
Vo1
3
V
Vo1
L1 =
=
I
sw
V
Io1
sw
V
-
-
(3)
IN(max)
L1(ripple)
IN(max)
V
Vo1
I
=
L1
sw
V
-
(4)
trip
L1(peak)
L1(ripple)
DS(on)
V
I
=
+ I
R
(5)
(
)
2
1
L1(RMS)
L1(ripple)
12
I
=
Io1 +
I
(6)
SLUS909 – MAY 2009........................................................................................................................................................................................................ www.ti.com
Figure 31. Typical Application Circuit at 700 kHz Switching frequency Selection (TEST2 Pin = V5FILT)
Component Selection:
1. Choose inductor.
The inductance value is selected to provide approximately 30% peak to peak ripple current at maximum load.
Larger ripple current increases output ripple voltage, improve S/N ratio and contribute to stable operation.
Equation 3 can be used to calculate L1.
The inductors current ratings needs to support both the RMS (thermal) current and the Peak (saturation)
current. The RMS and peak inductor current can be estimated as follows:
Note: The calculation above shall serve as a general reference. To further improve transient response, the
output inductance could be reduced further. This needs to be considered along with the selection of the
output capacitor.
2. Choose output capacitor.
20
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53126
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