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參數(shù)資料
| 型號： | TPS61087DSCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.8 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 4/30頁 |
| 文件大?。?/td> | 964K |
| 代理商： | TPS61087DSCR |
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-
D
=
×
S
IN
out
C
S
out
V
I
V
f
C
_
(
)
_
D
=
×
C ESR
L peak
C ESR
V
I
R
SLVS821B – MAY 2008 – REVISED MARCH 2010
www.ti.com
Table 3. Recommended Compensation Network Values at High/Low Frequency
FREQUENCY
L
VS
VIN ± 20%
RCOMP
CCOMP
5 V
100 k
820 pF
15 V
3.3 V
91 k
1.2 nF
5 V
68 k
820 pF
High (1.2 MHz)
3.3 mH
12 V
3.3 V
68 k
1.2 nF
5 V
39 k
820 pF
9 V
3.3 V
39 k
1.2 nF
5 V
51 k
1.5 nF
15 V
3.3 V
47 k
2.7 nF
5 V
33 k
1.5 nF
Low (650 kHz)
6.8 mH
12 V
3.3 V
33 k
2.7 nF
5 V
18 k
1.5 nF
9 V
3.3 V
18 k
2.7 nF
Table 3 gives conservative RCOMP and CCOMP values for certain inductors, input and output voltages providing a
very stable system. For a faster response time, a higher RCOMP value can be used to enlarge the bandwidth, as
well as a slightly lower value of CCOMP to keep enough phase margin. These adjustments should be performed in
parallel with the load transient response monitoring of TPS61087.
Input Capacitor Selection
For good input voltage filtering low ESR ceramic capacitors are recommended. TPS61087 has an analog input
IN. Therefore, a 1 mF bypass is highly recommended as close as possible to the IC from IN to GND.
Two 10 mF (or one 22 mF) ceramic input capacitors are sufficient for most of the applications. For better input
voltage filtering this value can be increased. See Table 4 and typical applications for input capacitor
recommendation.
Output Capacitor Selection
For best output voltage filtering a low ESR output capacitor like ceramic capcaitor is recommended. Four 10 mF
ceramic output capacitors (or two 22 mF) work for most of the applications. Higher capacitor values can be used
to improve the load transient response. See Table 4 for the selection of the output capacitor.
Table 4. Rectifier Input and Output Capacitor Selection
CAPACITOR/SIZE
VOLTAGE RATING
SUPPLIER
COMPONENT CODE
CIN
22 mF/1206
16 V
Taiyo Yuden
EMK316 BJ 226ML
IN bypass
1 mF/0603
16 V
Taiyo Yuden
EMK107 BJ 105KA
COUT
10 mF/1206
25 V
Taiyo Yuden
TMK316 BJ 106KL
To calculate the output voltage ripple, the following equation can be used:
(10)
with
ΔVC
Output voltage ripple dependent on output capacitance,output current and switching frequency
VS
Output voltage
VIN
Minimum input voltage of boost converter
fS
Converter switching frequency (typically 1.2 MHz or 650 kHz)
Iout
Output capacitance
ΔVC_ESR
Output voltage ripple due to output capacitors ESR (equivalent series resistance)
ISWPEAK
Inductor peak switch current in the application
12
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS61087
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