參數(shù)資料
型號: LTC3816EFE#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, PDSO38
封裝: LEAD FREE, PLASTIC, TSSOP-38
文件頁數(shù): 32/44頁
文件大小: 753K
代理商: LTC3816EFE#TRPBF
LTC3816
3816f
applicaTions inForMaTion
For the synchronous MOSFETs, assume that the two
bottom MOSFETs share the inductor current equally. The
power dissipation for one MOSFET is:
P
V
I
R
P
SYNC
IN
OUT
IN
LOAD MAX
DS ON
SYNC
=
(
) +
( )
(
)
( )
2
1
δ
==
(
) +
(
)
=
12
0 75
12
13 5
1 0 25 2 8
0 598
2
V
A
m
W
– .
.
The total power dissipation of the bottom MOSFETs is
2
× 0.598W = 1.196W.
For this application, the maximum input RMS current
happens when VIN = VIN(MIN) and can be determined from
the formula:
I
V
RMS MAX
LOAD MAX
OUT
IN MIN
OUT
IN MIN
(
)
(
)
(
)
(
)
(
)
II
A
V V
V
A
RMS MAX
(
)
.
– .
.
(
)
27
0 75 5
0 75
5
9 64
The minimum RMS current rating of the input capacitor
mustexceed9.64A.Tomeetthisripplecurrentrequirement
with VIN(MAX) = 24V, select two Sanyo OS-CON 25SVP56
capacitors or higher voltage rating capacitor as the input
supply bulk capacitance. In addition, place a couple of
high performance ceramic capacitors in parallel with the
bulk capacitors.
The output capacitor value is determined by:
C
L I
V
BULK
CER
LOAD
OUT
OUT LOAD
+
=
(
)
(
)
2
(
)
Most regulator designs allow a slight transient overshoot
for a short duration. If this is limited to 40mV, we have:
V
AVP I
I
mV
A
OUT AVP
LOAD MAX
LOAD MIN
(
)
(
)
(
)
=
(
)
= 3
27 –– .
.
(
)
(
)
1 5
76 5
A
mV
V
OUT LOAD
OUT AVP
OVERSHO
(
)=
=
+
OOT
BULK
CER
mV
C
H
A
=
+
=
+
=
76 5
40
116 5
0 33
27
1 5
.
– . AA
V
mV
F
(
)
(
)(
)
=
2
2 0 75
116 5
1228
.
The ESR of the output capacitor is determined by the load
transient requirement. If the output voltage jump due to
the capacitor ESR is limited to
VOUT(AVP):
R
V
I
mV
A
m
ESR
OUT AVP
LOAD
<
= (
)
=
(
)
– .
.
75
27
1 5
2 94
The above requirements are easily satisfied by three
Sanyo POSCAP 2TPF330M6 330F (ESR = 6m) bulk
capacitors in parallel, twenty 10F and some 1F high
performance ceramic capacitors in the processor socket
cavity. With three bulk capacitors in parallel, the effective
ESR is 2m, and the maximum steady-state output ripple
voltage is given by:
V
I R
f
C
A
OUT
L
ESR
OSC
BULK
CER
+
(
)
=
1
8
5 5
.
22
1
8 400
3 330
20 10
11
1 4
m
kHz
F
mV
+
(
)
=
+
. 44
12 44
mV
= .
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