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參數(shù)資料
| 型號： | ADP1148 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CPF-1 METAL FILM RESISTORS, AXIAL LEADS |
| 中文描述： | 高效率同步降壓型開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 191K |
| 代理商： | ADP1148 |
ADP1148, ADP1148-3.3, ADP1148-5
–11–
REV. A
Board Layout
When laying out the printed circuit board, the following check
list should be used to ensure proper operation of the ADP1148.
T hese items are also illustrated graphically in the layout diagram
of Figure 18. Check the following in your layout:
1) Are the signal and power grounds segregated T he ADP1148
SIGNAL GND (Pin 11) must return to the (–) plate of C
OUT
.
T he power ground returns to the source of the N-channel
MOSFET , anode of the Schottky diode, and (–) plate of C
IN
,
which should have as short lead lengths as possible.
2) Does the ADP1148 SENSE(–), (Pin 7), connect to a point
close to R
SENSE
and the (+) plate Of C
OUT
In adjustable
versions the resistive divider R1, R2 must be connected be-
tween the (+) plate of C
OUT
and signal ground.
3) Are the SENSE(–) and SENSE(+) leads routed together with
minimum PC trace spacing T he 1000 pF capacitor between
Pins 7 and 8 should be as close as possible to the ADP1148.
4) Does the (+) plate of C
IN
connect to the source of the
P-channel MOSFET as closely as possible T his capacitor
provides the ac current to the P-channel MOSFET .
5) Is the input decoupling capacitor (1
μ
F) connected closely
between V
IN
(Pin 3) and POWER GND (Pin 12) T his
capacitor carries the MOSFET driver peak currents.
6) Is INT V
CC
(Pin 5) decoupled with a 10 nF capacitor to
signal ground
7) Is the SHUT DOWN (Pin 10) actively pulled to ground
during normal operation T he Shutdown pin is high imped-
ance and must not be allowed to float.
T o prevent noise spikes from erroneously tripping the current
comparator, a 1000 pF capacitor is needed across Sense(–) and
Sense(+).
P-DRIVE
NC
V
IN
C
T
INT V
CC
I
TH
SENSE(–)
N-DRIVE
NC
POWER GND
SIGNAL GND
SHUTDOWN
V
FB
SENSE(+)
ADP1148
3300pF
1k
V
D1
C
IN
L
R1
R2
C
OUT
10nF
C
T
1
m
F
1
2
3
4
5
6
7
14
13
12
11
10
9
8
N-CHANNEL
1000pF
R1, R2 OUTPUT DIVIDER REQUIRED
FOR ADJUSTABLE VERSION ONLY.
R
SENSE
–
–
V
IN
V
OUT
P-CHANNEL
NC = NO CONNECT
Figure 18. ADP1148 Layout Diagram (See Board Layout)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADP1148AN-3.3 | Current-Mode SMPS Controller |
| ADP1148AR-3.3 | 10MHz, Rail-to-Rail Input and Output Op Amp in SOT-23; Package: SOT; No of Pins: 5; Temperature Range: 0°C to +70°C |
| ADP1148AR-33 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| ADP1148AR-5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| ADP1173AN-12 | RECTIFIER SCHOTTKY SINGLE 1A 80V 25A-ifsm 0.8V-vf 0.5mA-ir DO-41 5K/AMMO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| adp11480003rr | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| ADP1148-3.3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High Efficiency Synchronous Step-Down Switching Regulators(273.94 k) |
| ADP1148-5 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| ADP1148AN | 制造商:Rochester Electronics LLC 功能描述:HIGH EFF SYNCHRONOUS STEP - Bulk |
| ADP1148AN-3.3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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