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參數(shù)資料
| 型號： | LTC3586EUFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封裝： | 4 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-38 |
| 文件頁數(shù)： | 24/36頁 |
| 文件大?。?/td> | 317K |
| 代理商： | LTC3586EUFE#PBF |
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LTC3586/LTC3586-1
30
3586fa
APPLICATIONS INFORMATION
Closing the Feedback Loop
The LTC3586/LTC3586-1 incorporate voltage mode PWM
control. The control to output gain varies with operation
region (buck, boost, buck-boost), but is usually no greater
than 20. The output lter exhibits a double pole response
given by:
f
LC
Hz
FILTER POLE
OUT
_
=
1
2
π
where COUT is the output lter capacitor.
The output lter zero is given by:
f
RC
Hz
FILTER ZERO
ESR
OUT
_
=
1
2
π
where RESR is the capacitor equivalent series resistance.
A troublesome feature in boost mode is the right-half plane
zero (RHP), and is given by:
f
V
IL V
Hz
RHPZ
IN
OUT
=
2
π
The loop gain is typically rolled off before the RHP zero
frequency.
A simple Type I compensation network (as shown in
Figure 8) can be incorporated to stabilize the loop but
at the cost of reduced bandwidth and slower transient
response. To ensure proper phase margin, the loop must
cross unity-gain decade before the LC double pole.
The unity-gain frequency of the error amplier with the
Type I compensation is given by:
f
RCP
Hz
UG =
1
21
1
π
Most applications demand an improved transient response
to allow a smaller output lter capacitor. To achieve a higher
bandwidth, Type III compensation is required. Two zeros
are required to compensate for the double-pole response.
Type III compensation also reduces any VOUT3 overshoot
seen during a startup condition.
Table 7. Recommended Inductors for Buck-Boost Regulator
INDUCTOR
TYPE
L
(μH)
MAX
IDC
(A)
MAX
DCR
(Ω)
SIZE IN mm
(L
× W × H) MANUFACTURER
LPS4018
3.3
2.2
2.5
0.08
0.07
3.9
× 3.9 × 1.7
3.9
× 3.9 × 1.7
Coilcraft
www.coilcraft.com
D53LC
2.0
3.25
0.02
5.0
× 5.0 × 3.0 Toko
www.toko.com
7440430022
2.2
2.5
0.028 4.8
× 4.8 × 2.8 Würth-Elektronik
www.we-online.com
CDRH4D22/
HP
2.2
2.4
0.044 4.7
× 4.7 × 2.4 Sumida
www.sumida.com
SD14
2.0
2.56 0.045
5.2
× 5.2 ×
1.45
Cooper
www.cooperet.com
Buck-Boost Regulator Input/Output Capacitor
Selection
Low ESR ceramic capacitors should be used at both the
buck-boost regulator output (VOUT3) as well as the buck-
boost regulator input supply (VIN3). Again, only X5R or
X7R ceramic capacitors should be used because they
retain their capacitance over wider voltage and temperature
ranges than other ceramic types. A 22μF output capacitor is
sufcient for most applications. The buck-boost regulator
input supply should be bypassed with a 2.2μF capacitor.
Refer to Table 6 for recommended ceramic capacitor
manufacturers.
Buck-Boost Regulator Output Voltage Programming
The buck-boost regulator can be programmed for output
voltages greater than 2.75V and less than 5.5V. The full
scale output voltage is programmed using a resistor divider
from the VOUT3 pin connected to the FB3 pin such that:
VV
R
OUT
FB
33
1
2
1
=+
where VFB3 is 0.8V. See Figure 8 or 9.
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參數(shù)描述 |
|---|---|
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