參數(shù)資料
型號(hào)： AAT1151IKS-2.5-T1
廠商： Advanced Analogic Technologies, Inc.
英文描述： 850kHz 700mA Synchronous Buck DC/DC Converter
中文描述： 850kHz 700mA的同步降壓DC / DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 12/16頁(yè)
文件大小： 396K
代理商： AAT1151IKS-2.5-T1
AAT1151
850kHz 700mASynchronous Buck DC/DC Converter
12
1151.2005.11.1.4
Thermal Calculations
There are two types of losses associated with the
AAT1151 output switching MOSFET: switching loss-
es and conduction losses. Conduction losses are
associated with the R
DS(ON)
characteristics of the
output switching device. At the full load condition,
assuming continuous conduction mode (CCM), a
simplified form of the total losses is given by:
where I
q
is the AAT1151 quiescent current.
Once the total losses have been determined, the
junction temperature can be derived from the
θ
JA
for the MSOP-8 package.
Adjustable Output
For applications requiring an output other than the
fixed available, the 1V version can be programmed
externally. Resistors R3 and R4 of Figure 7 force
the output to regulate higher than 1 volt. R4 should
be 100 times less than the 1M
internal resistance
of the FB pin (recommended 10k
). Once R4 is
selected, R3 can be calculated. For a 1.25 volt out-
put with R4 set to 10.0k
, R3 is 2.55k
.
R3 = (V
O
- 1) · R4 = 0.25 · 10k
= 2.55k
T
J
= P ·
θ
JA
+ T
AMB
SW
O
IN
IN
I
O
2
·
(R
DSON(HS)
· V
O
+
R
DSON(LS)
· (V
IN
·
V
O
))
V
P =
F I
V
·
+ I
Q
) · V
IN
·
+ (t
相關(guān)PDF資料
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AAT1152 Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:4; Connector Shell Size:32; Connecting Termination:Solder; Circular Shell Style:Square Flange Receptacle; Body Style:Straight
AAT1152IKS-1.1-T1 Triaxial Cable; Coaxial RG/U Type:59; Impedance:75ohm; Conductor Size AWG:22; No. Strands x Strand Size:19 x 34; Jacket Material:Polyvinylchloride (PVC); Capacitance:17pF/ft; Conductor Material:Copper; Jacket Color:Black RoHS Compliant: Yes
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