參數(shù)資料
型號(hào): LTC3816EFE#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類(lèi): 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, PDSO38
封裝: LEAD FREE, PLASTIC, TSSOP-38
文件頁(yè)數(shù): 31/44頁(yè)
文件大小: 753K
代理商: LTC3816EFE#PBF
LTC3816
3816f
applicaTions inForMaTion
Therefore RSER is calculated to be 13.99k and standard
valueRSER=14kisused.Next,theresistorRAVPDCRNvalue
is obtained from the AVP slope requirement:
A
mV A
R
AVP
SER
PAR
NTC
AVPDCRN
DCR
= =
=
+
(
)
3
/
||
RR
k
mV A
m
k
AVPDCRN =
+
(
)
=
14
10 10
3
1 3
8 233
||
/
.
.
Selectthestandardvalue8.25k.ThecapacitorvalueCVDCRN
is given by the following equation:
C
L
R
H
k
VDCRN
SER
PAR
NTC
DCR
=
+
(
)
=
+
||
.
0 33
14
10kk
k
m
nF
||
.
.
10
1 3
13 36
(
)
=
Use the standard value CVDCRN = 15nF.
To program the IMON voltage, first select the resistor
RPREIMON such that IPREIMON bias current is around 10A
to 20A:
R
I
R
I
R
PREIMON
LOAD MAX
DCR
PREIMON
NTCNET
AVPDCR
=
(
)
NN
A
m
A
k
=
+
(
)
=
27 1 3
15
14
10 10
8 25
5 389
.
||
.
Select a standard value RPREIMON = 5.1k. Once the resistor
RPREIMON value is chosen, the RIMON resistor value can
be obtained from the following equation:
R
V
R
I
R
IMON
PREIMON
LOAD MAX
DCR
AVPDCR
=
(
)
(
)
3
NN
NTCNET
R
V
k
A
m
k
=
(
)
+
1 0 5 1
3 27 1 3
8 25
14
10
.
.
.
.
||
110
21 03
k
(
)
= .
Select RIMON = 21k. The value of CIMON is selected to
satisfy the desired IMON time constant:
C
t
R
s
k
nF
IMON
=
300
21
14 28
.
Select CIMON = 15nF.
The power MOSFETs chosen for this application are the
Renesas RJK0305DPB (top) and 2
× RJK0330DPB (bot-
tom). The upper MOSFET, which is optimized for low
switching losses, has a typical RDS(ON) of 10m at VGS
= 4.5V, a total gate charge of 8nC, and a minimum BVDSS
of 30V. The bottom MOSFET which is optimized for low
on-resistance, has a typical RDS(ON) of 2.8m at VGS =
4.5V, a total gate charge of 27nC, and a minimum BVDSS
of 30V.
From the RJK0305DPB upper MOSFET data sheet, the
Miller capacitance is calculated to be:
C
Q
V
nC
V
pF
MILLER
G
DS
=
2
12
167
Assuming a top MOSFET junction temperature of 75°C,
δ = 0.25 and the power dissipation in this MOSFET is:
P
V
I
R
t
V
I
MAIN
OUT
IN
LOAD MAX
DS ON
IN
=
(
) +
( )
+
( )
(
)
( )
2
1
δ
LLOAD MAX
DR
MILLER
INTVCC
GS MIL
G
R
C
V
(
)
(
)
2
1
( )(
)
+
SS MIL
OSC
MAIN
f
P
V
A
(
)
.
( )
=
( ) +
0 75
12
27
1 0 25
2
((
)
+
( )
(
)(
)
+
10
12
27
2
2 6
167
1
5 2
3
1
3
2
m
V
A
pF
V
.
.
(
)
=
+
400
0 57
0 266
0 836
kHz
P
W
MAIN
.
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