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参数资料
| 型号： | LTC3610IWP#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PQCC64 |
| 封装： | 9 X 9 MM, PLASTIC, QFN-64 |
| 文件页数： | 4/24页 |
| 文件大小： | 388K |
| 代理商： | LTC3610IWP#TR |
LTC3610
3610ff
applications inForMation
InductorSelection
Given the desired input and output voltages, the induc-
tor value and operating frequency determine the ripple
current:
ΔIL =
VOUT
f L
1
VOUT
VIN
Lower ripple current reduces core losses in the inductor,
ESR losses in the output capacitors and output voltage
ripple. Highest efficiency operation is obtained at low
frequency with small ripple current. However, achieving
this requires a large inductor. There is a trade-off between
component size, efficiency and operating frequency.
A reasonable starting point is to choose a ripple current
that is about 40% of IOUT(MAX). The largest ripple current
occurs at the highest VIN. To guarantee that ripple current
does not exceed a specified maximum, the inductance
should be chosen according to:
L =
VOUT
f ΔIL(MAX)
1
VOUT
VIN(MAX)
Once the value for L is known, the type of inductor must
be selected. High efficiency converters generally cannot
afford the core loss found in low cost powdered iron cores.
A variety of inductors designed for high current, low volt-
age applications are available from manufacturers such as
Sumida, Panasonic, Coiltronics, Coilcraft and Toko.
CINandCOUTSelection
The input capacitance CIN is required to filter the square
wavecurrentatthedrainofthetopMOSFET.UsealowESR
capacitor sized to handle the maximum RMS current.
IRMS IOUT(MAX)
VOUT
VIN
VOUT
– 1
This formula has a maximum at VIN = 2VOUT, where
IRMS = IOUT(MAX)/2. This simple worst-case condition is
commonly used for design because even significant de-
viations do not offer much relief. Note that ripple current
ratings from capacitor manufacturers are often based on
only 2000 hours of life which makes it advisable to derate
the capacitor.
The selection of COUT is primarily determined by the
ESR required to minimize voltage ripple and load step
transients. The output ripple
ΔVOUT is approximately
bounded by:
ΔVOUT ≤ ΔIL ESR+
1
8fCOUT
Figure3.MaximumSwitchingFrequencyvsDutyCycle
2.0
1.5
1.0
0.5
0
0.25
0.50
0.75
3610 F03
1.0
DROPOUT
REGION
DUTY CYCLE (VOUT/VIN)
SWITCHING
FREQUENCY
(MHz)
Figure2.CorrectingFrequencyShiftwithLoadCurrentChanges
CVON
0.01F
RVON2
100k
RVON1
30k
CC
VOUT
RC
(2a)
(2b)
VON
ITH
LTC3610
CVON
0.01F
RVON2
10k
Q1
2N5087
RVON1
3k
10k
CC
3610 F02
VOUT
INTVCC
RC
VON
ITH
LTC3610
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