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參數(shù)資料
| 型號(hào)： | ML4865 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Voltage High Current Boost Regulator |
| 中文描述： | 高電壓大電流升壓穩(wěn)壓器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 126K |
| 代理商： | ML4865 |
ML4865
PRODUCT SPECIFICATION
6
REV. 1.0.2 8/10/01
Figure 4. Output Current vs. Input Voltage
Figure 5. Efficiency vs. Output Current
Figure 6. No Load Input Current vs.
Input Voltage for the Circuit of Figure 7
The curves and the equations are based on the operating
circuit shown in Figure 7. It is recommended to verify the
current capability and efficiency for the components
selected.
Figure 7. Typical Application Circuit
Inductor Selection
The ML4865 is able to operate over a wide range of inductor
values. A value of 22μH or 33μH is a good choice, but any
value between 15μH and 50μH is acceptable. As the inductor
value is changed the control circuitry will automatically
adjust to keep the inductor current under control. Choosing
an inductance value of less than 15μH will reduce the com-
ponent’s footprint, but the efficiency and maximum output
current may drop.
It is important to use an inductor that is rated to handle 1.5A
peak currents without saturating. Also look for an inductor
with low winding resistance. A good rule of thumb is to
allow 5 to 10m
of resistance for each μH of inductance.
The final selection of the inductor will be based on trade-offs
between size, cost and efficiency. Inductor tolerance, core
and copper loss will vary with the type of inductor selected
and should be evaluated with a ML4865 under worst case
conditions to determine its suitability.
Several manufacturers supply standard inductance values in
surface mount packages:
Coilcraft
(847) 639-6400
Coiltronics
(561) 241-7876
Dale
(605) 665-9301
Sumida
(847) 956-0666
Output Capacitor
The output capacitor filters the pulses of current from the
switching regulator. Since the switching frequency will vary
with inductance, the minimum output capacitance required
to reduce the output ripple to an acceptable level will be a
function of the inductor used. Therefore, to maintain an out-
put voltage with less than 100mV of ripple (due to capaci-
tance) at full load current, use the following equation:
900
700
500
300
100
0
I
VIN (V)
0
4
8
10
2
6
WITH
EXTERNAL
SCHOTTKY
WITHOUT
EXTERNAL
SCHOTTKY
100
90
80
70
60
50
E
IOUT (mA)
1
10
100
1000
VOUT = 12V
with Schottky
without Schottky
VIN = 2V
VIN = 5V
VIN = 10V
300
250
200
150
100
50
0
I
VIN (V)
0
4
6
10
8
2
WITH
EXTERNAL
SCHOTTKY
WITHOUT
EXTERNAL
SCHOTTKY
ML4865
D1
MBR0520L
VOUT
C2
47
μ
F
R1
1M
C1
47
μ
F
VIN
22
μ
H
(Sumida CD75)
SENSE
GND
VIN
VL1
VOUT
SHDN
VL2
PWR GND
C
(F)
L
V
OUT
OUT
=
×
10
(2)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4866 | 3.3V Output DC-DC Step-Down Converter(3.3V輸出的DC-DC步降變換器) |
| ML4869 | Medium Current Boost Regulator with Load Disconnect(負(fù)載可分離的中等電流升壓穩(wěn)壓器) |
| ML4870 | High Current Boost Regulator with Load Disconnect(負(fù)載可分離的大電流升壓穩(wěn)壓器) |
| ML4872 | High Current Boost Regulator with Shutdown(帶關(guān)斷電路的大電流升壓穩(wěn)壓器) |
| ML4875 | High Current Boost Regulator with Shutdown(帶關(guān)斷電路的大電流升壓穩(wěn)壓器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4865CS2 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 SOIC-8 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML4865CS-2 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Voltage High Current Boost Regulator |
| ML4865CS2X | 功能描述:DC/DC 開關(guān)控制器 SOIC-8 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| ML4865ES-2 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Voltage High Current Boost Regulator |
| ML4866 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:3.3V Output DC-DC Step-Down Converter |
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