參數(shù)資料
型號(hào)： LT3692EUH#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32
文件頁(yè)數(shù)： 16/36頁(yè)
文件大?。?/td> 526K
代理商： LT3692EUH#PBF
LT3692
23
3692f
APPLICATIONS INFORMATION
Application Optimization
In multiple channel applications requiring large VIN to
VOUT ratios, the maximum frequency and resulting in-
ductor size is determined by the channel with the largest
ratio. The LT3692’s multi-frequency operation allows the
user to minimize component size for each channel while
maintaining constant frequency operation. The circuit in
Figure 17 illustrates this approach. A 2-stage step-down
approach coupled with multi-frequency operation will
further reduce external component size by allowing an
increase in frequency for the channel with the lower VIN
to VOUT ratio. The drawback to this approach is that the
output power capability for the first stage is determined
by the output power drawn from the second stage. The
dual step-down application in Figure 18 steps down the
input voltage (VIN1) to the highest output voltage then
uses that voltage to power the second output (VIN2).VOUT1
must be able to provide enough current for its output plus
VOUT2 maximum load. Note that the VOUT1 voltage must
be above VIN2’s minimum input voltage as specified in the
Electrical Characteristics (2.8V) when the second channel
starts to switch. Delaying channel 2 can be accomplished
by either independent soft-start capacitors or sequencing
with the CMP01 output.
For example, assume a maximum input of 36V:
VIN = 36V, VOUT1 = 3.3V at 1.5A and VOUT2 = 1.8V at 1.5A.
Frequency (Hz)
=
VOUT + VD
VIN – VSW + VD
1
tON(MIN)
L
=
VIN – VOUT
(
) VOUT
VIN f
Single Step Down:
Frequency (Hz)
=
1.8
+ 0.6
36V – 0.4
+ 0.6
1
225ns
250kHz
L1
=
36V – 3.3
(
) 3.3
36V 250kHz
≥ 12H
L2
=
36V – 1.8
(
) 1.8
36V 250kHz
≥ 6.8H
2-Stage Step-Down:
Frequency (Hz)
=
3.3
+ 0.6
36V – 0.4
+ 0.6
1
225ns
400kHz
L1
=
36V – 3.3
(
) 3.3
36V 400kHz
≥ 7.5H
L2
=
3.3 – 1.8
(
) 1.8
3.3 400kHz
≥ 2H
2-Stage Step-Down Multi-Frequency:
RDIV = 100k, FREQ1 = 400kHz, FREQ2 = 1600kHz.
L1
=
36V – 3.3
(
)3.3
36V 400kHz
≥ 7.5H
L2
=
3.3 – 1.8
(
)1.8
3.3 2MHz
≥ 500nH
In addition, RILIM2 = 40.2k reduces the peak current limit
on channel to 2.5A, which reduces inductor size and catch
diode requirements.
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