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| 型號： | TPS65820RSHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56 |
| 封裝： | 7 X 7 MM, GREEN, PLASTIC, QFN-56 |
| 文件頁數(shù)： | 87/98頁 |
| 文件大?。?/td> | 2290K |
| 代理商： | TPS65820RSHT |
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APPLICATION INFORMATION
INDUCTOR AND CAPACITOR SELECTION — CONVERTERS SM1 AND SM2
F +
1
2p LC
+ 27.7 kHz (a) for L + 3.3 mH and C + 10 mF
(9)
Itarget +
V
OUT
0.3
I
OUT_MAX
1 *
V
OUT
V
IN_MAX
f
(10)
DIL +
V
L
Dt +
V
OUT
L
1 *
V
OUT
V
IN
f
(11)
I
Lmax + IOUTmax )
DIL
2
(12)
SLVS663B – MAY 2006 – REVISED APRIL 2008 .............................................................................................................................................................. www.ti.com
SM1 and SM2 are designed with internal voltage mode compensation and the stabilization is based on choosing
an LC filter that has a corner frequency around 27 kHz. It is not recommended to use LC values that would be
outside the range of 13 kHz to 40 kHz.
Equation 9 calculates the corner frequency of the output LC filter. The standard recommended LC values are
3.3
H and 10 F.
The inductor value, along with the input voltage VIN, output voltage VOUT and switching frequency f define the
ripple current. Typically the ripple current target is 30% of the full load current. At light loads it is desirable for
ripple current to be less then 150% of the light load current.
The inductor should be chosen with a rating to handle the peak ripple current., if an inductor’s current gets higher
than its rated saturation level (DCR), the inductance starts to fall off, and the inductor’s ripple current increases
exponentially. The DCR of the inductor plays an important role in efficiency and size of the inductor. Larger
diameter wire has less DCR but may increase the size of the inductor
Equation 10 calculates the target inductor value. If an inductor value has already been chosen, Equation 11,
calculates the inductor’s ripple current under static operating conditions. The ripple amplitude can be calculated
during the on time (positive ramp) or during the off time (negative ramp). It is easiest to calculate the ripple using
the off time since the inductor’s voltage is the output voltage.
Equation 12 calculates the peak current due to the output load and ripple current
For a faster transient response, a lower inductor and higher capacitance allows the output current to ramp faster,
while the addition capacitance holds up the output longer (a 2.2-
H inductor in combination with a 22-F output
capacitor are recommended).
The highest inductor current occurs at the maximum input voltage. The peak inductor current during a transient
may be higher than the steady state peak current and should be considered when choosing an inductor.
Monitoring the inductor current for non-saturation operation during a transient of 1.2
× I_loadmax at Vin_max
ensures adequate saturation margin.
Table 18. Inductors for Typical Operation Conditions
DEVICE
INDUCTOR VALUE
TYPE
COMPONENT SUPPLIER
DCDC3 converter
3.3
H
CDRH2D14NP-3R3
Sumida
3.3
H
PDS3010-332
Coilcraft
3.3
H
VLF4012AT-3R3M1R3
TDK
2.2
H
VLF4012AT-2R2M1R5
TDK
2.2
H
NR3015T2R2
Taoup-Uidem
88
Copyright 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65820
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