- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄165353 > ADP5024ACPZ-1-R7 (ANALOG DEVICES INC) SWITCHING REGULATOR, PQCC24 PDF資料下載
參數(shù)資料
| 型號： | ADP5024ACPZ-1-R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC24 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, MO-220, LCC-24 |
| 文件頁數(shù)： | 14/27頁 |
| 文件大?。?/td> | 926K |
| 代理商： | ADP5024ACPZ-1-R7 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁當前第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁
Preliminary Technical Data
ADP5024
Rev. PrA | Page 21 of 27
APPLICATIONS INFORMATION
BUCK EXTERNAL COMPONENT SELECTION
Trade-offs between performance parameters such as
efficiency and transient response can be made by varying the
choice of external components in the applications circuit, as
shown in Figure 1.
Feedback Resistors
For the adjustable model, referring to figure 49 the total
combined resistance for R1 and R2 is not to exceed 400k.
Inductor
The high switching frequency of the ADP5024 bucks allows
for the selection of small chip inductors. For best
performance, use inductor values between 0.7 μH and 3 μH.
Suggested inductors are shown in Table 8.
The peak-to-peak inductor current ripple is calculated using
the following equation:
L
f
V
I
SW
IN
OUT
IN
OUT
RIPPLE
×
×
=
)
(
where:
fSW is the switching frequency.
L is the inductor value.
The minimum dc current rating of the inductor must be
greater than the inductor peak current. The inductor peak
current is calculated using the following equation:
2
)
(
RIPPLE
MAX
LOAD
PEAK
I
+
=
Inductor conduction losses are caused by the flow of current
through the inductor, which has an associated internal dc
resistance (DCR). Larger sized inductors have smaller DCR,
which may decrease inductor conduction losses. Inductor
core losses are related to the magnetic permeability of the core
material. Because the bucks are high switching frequency dc-
to-dc converters, shielded ferrite core material is
recommended for
its low core losses and low EMI.
Output Capacitor
Higher output capacitor values reduce the output voltage
ripple and improve load transient response. When choosing
this value, it is also important to account for the loss of
capacitance due to output voltage dc bias.
Ceramic capacitors are manufactured with a variety of dielec-
trics, each with a different behavior over temperature and
applied voltage. Capacitors must have a dielectric adequate
to ensure the minimum capacitance over the necessary
temperature range and dc bias conditions. X5R or X7R
dielectrics with a voltage rating of 6.3 V or 10 V are recom-
mended for best performance. Y5V and Z5U dielectrics are
not recommended for use with any dc-to-dc converter
because of their poor temperature and dc bias characteristics.
The worst-case capacitance accounting for capacitor variation
over temperature, component tolerance, and voltage is calcu-
lated using the following equation:
CEFF = COUT × (1 TEMPCO) × (1 TOL)
where:
CEFF is the effective capacitance at the operating voltage.
TEMPCO is the worst-case capacitor temperature coefficient.
TOL is the worst-case component tolerance.
In this example, the worst-case temperature coefficient
(TEMPCO) over 40°C to +85°C is assumed to be 15% for an
X5R dielectric. The tolerance of the capacitor (TOL) is
assumed to be 10% and COUT is 9.24 μF at 1.8 V, as shown in
Figure 49.
Substituting these values in the equation yields
CEFF = 9.24 μF × (1 0.15) × (1 0.1) = 7.074 μF
To guarantee the performance of the bucks, it is imperative
that the effects of dc bias, temperature, and tolerances on the
behavior of the capacitors be evaluated for each application.
0
2
4
6
8
10
12
0
1
2
3
4
5
6
DC BIAS VOLTAGE (V)
C
A
P
A
C
IT
A
N
C
E
(
F
)
0
9
7
0
3
-0
1
0
Figure 49. Capacitance vs. Voltage Characteristic
Table 8. Suggested 1.0 μH Inductors
Vendor
Model
Dimensions (mm)
ISAT (mA)
DCR (mΩ)
Murata
LQM2MPN1R0NG0B
2.0 × 1.6 × 0.9
1400
85
Murata
LQM18FN1R0M00B
3.2 × 2.5 × 1.5
2300
54
Taiyo Yuden
CBC3225T1R0MR
3.2 × 2.5 × 2.5
2000
71
Coilcraft
XFL4020-102ME
4.0 × 4.0 × 2.1
5400
11
Coilcraft
XPL2010-102ML
1.9 × 2.0 × 1.0
3750
89
Toko
MDT2520-CN
2.5 × 2.0 × 1.2
1350
85
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADPDF5A24AC | SNAP ACTING/LIMIT SWITCH, DPDT, MOMENTARY, 1A, 30VDC, 12mm, PANEL MOUNT |
| ADPDF5P04AW | SNAP ACTING/LIMIT SWITCH, DPST, MOMENTARY, 1A, 30VDC, 2.54mm, PANEL MOUNT |
| ADPFF5W04AC | SNAP ACTING/LIMIT SWITCH, DPDT, MOMENTARY, 1A, 30VDC, 8.71mm, PANEL MOUNT |
| ADPFF5T04AW | SNAP ACTING/LIMIT SWITCH, DPST, MOMENTARY, 1A, 30VDC, 12.67mm, PANEL MOUNT |
| ASKHF3P04AY | SNAP ACTING/LIMIT SWITCH, SPST, MOMENTARY, 2A, 24VDC, 2.54mm, PANEL MOUNT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP5024ACPZ-2-R7 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| ADP5024ACPZ-R2 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 ADJ Outputs UVLO Low RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| ADP5024ACPZ-R7 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 ADJ Outputs UVLO Low RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| ADP5024CP-EVALZ | 功能描述:BOARD EVAL FOR ADP5024 LFCSP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:* 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ADP50250001CBZR | 功能描述:IC RF REGULATOR LDO 制造商:analog devices inc. 系列:* 零件狀態(tài):上次購買時間 標準包裝:1 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。