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參數(shù)資料
| 型號(hào)： | LTC3611EWP |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 10 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC64 |
| 封裝： | 9 X 9 MM, PLASTIC, QFN-64 |
| 文件頁數(shù)： | 5/26頁 |
| 文件大?。?/td> | 411K |
| 代理商： | LTC3611EWP |
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LTC3611
3611fd
Minimum Off-time and Dropout Operation
The minimum off-time, tOFF(MIN), is the smallest amount
of time that the LTC3611 is capable of turning on the bot-
tom MOSFET, tripping the current comparator and turning
the MOSFET back off. This time is generally about 250ns.
The minimum off-time limit imposes a maximum duty
cycle of tON/(tON + tOFF(MIN)). If the maximum duty cycle
is reached, due to a dropping input voltage for example,
then the output will drop out of regulation. The minimum
input voltage to avoid dropout is:
VIN(MIN) = VOUT
tON + tOFF(MIN)
tON
A plot of maximum duty cycle vs frequency is shown in
Figure 3.
Setting the Output Voltage
The LTC3611 develops a 0.6V reference voltage between
the feedback pin, VFB, and the signal ground as shown in
Figure 6. The output voltage is set by a resistive divider
according to the following formula:
VOUT = 0.6V 1+
R2
R1
ApplicAtions inForMAtion
Toimprovethefrequencyresponse,afeedforwardcapaci-
tor C1 may also be used. Great care should be taken to
route the VFB line away from noise sources, such as the
inductor or the SW line.
Inductor Selection
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 efciency 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, efciency 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 specied maximum, the inductance
should be chosen according to:
L =
VOUT
f ΔIL(MAX)
1
VOUT
VIN(MAX)
CVON
0.01F
RVON2
100k
RVON1
30k
CC
VOUT
RC
(2a)
(2b)
VON
ITH
LTC3611
CVON
0.01F
RVON2
10k
Q1
2N5087
RVON1
3k
10k
CC
3611 F02
VOUT
INTVCC
RC
VON
ITH
LTC3611
2.0
1.5
1.0
0.5
0
0.25
0.50
0.75
3611 F03
1.0
DROPOUT
REGION
DUTY CYCLE (VOUT/VIN)
SWITCHING
FREQUENCY
(MHz)
Figure 2. Correcting Frequency Shift with Load Current Changes
Figure 3. Maximum Switching Frequency vs Duty Cycle
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