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参数资料
| 型号： | LT1767EMS8#TR-3.3 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 4/16页 |
| 文件大小： | 232K |
| 代理商： | LT1767EMS8#TR-3.3 |
12
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
APPLICATIONS INFORMATION
WU
U
THERMAL CALCULATIONS
Power dissipation in the LT1767 chip comes from four
sources: switch DC loss, switch AC loss, boost circuit
current, and input quiescent current. The following
formulas show how to calculate each of these losses.
These formulas assume continuous mode operation, so
they should not be used for calculating efficiency at light
load currents.
Switch loss:
P
RI
V
ns I
V
f
SW
SW OUT
OUT
IN
OUT
IN
=
() (
)
+
()( )( )
2
17
Boost current loss for VBOOST = VOUT:
P
VI
V
BOOST
OUT
IN
=
()
2
50
/
Quiescent current loss:
PV
QIN
=
()
0 001
.
RSW = Switch resistance (≈ 0.27 – hot)
17ns = Equivalent switch current/voltage overlap time
f = Switch frequency
Figure 6. Typical Application and Suggested Layout (Topside Only Shown)
VIN
RC
CC
VOUT
C1
C3
C2
L1
1767 F06
SYNC
SHDN
D2
D1
KELVIN SENSE
VOUT
CONNECT TO
GROUND PLANE
MINIMIZE LT1767,
C3, D1 LOOP
KEEP FB AND VC COMPONENTS
AWAY FROM HIGH FREQUENCY,
HIGH INPUT COMPONENTS
PLACE FEEDTHROUGHS
AROUND GROUND PIN FOR
GOOD THERMAL CONDUCTIVITY
LT1767-2.5
BOOST
LT1767-2.5
VIN
OUTPUT
2.5V
1.2A
INPUT
12V
1767 F06a
C2
0.1
F
CC
1.5nF
RC
4.7k
D1
MBRM140
C1
10
F
CERAMIC
C3
2.2
F
CERAMIC
D2
1N914
L1
5
H
VSW
FB
SHDN
OPEN
OR
HIGH
= ON
GND
VC
SYNC
相关PDF资料 |
PDF描述 |
|---|---|
| LT1767EMS8#TR-1.8 | 3 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT1802CS8 | VIDEO AMPLIFIER, PDSO14 |
| LT1802IS8 | VIDEO AMPLIFIER, PDSO14 |
| LT1803CS5#PBF | 1 CHANNEL, VIDEO AMPLIFIER, PDSO5 |
| LT1952MPGN#PBF | SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
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|---|---|
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