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參數(shù)資料
| 型號(hào)： | ML4961 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Adjustable Output Low Voltage Boost Regulator with Detect(帶低電檢測(cè)電路的輸出可調(diào)、低電流單節(jié)電池上電升壓穩(wěn)壓器) |
| 中文描述： | 可調(diào)輸出低電壓升壓穩(wěn)壓器與檢測(cè)（帶低電檢測(cè)電路的輸出可調(diào)，低電流單節(jié)電池上電升壓穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 195K |
| 代理商： | ML4961 |
6
ML4961
Figure 4. Output Current vs. Input Voltage.
Figure 5. Typical Efficiency as a Function of V
IN
.
Figure 5 shows efficiency under the conditions used to
create Figure 4. It can be seen that efficiency is mostly
independent of input voltage and is closely related to
inductor value. This illustrates the need to keep the
inductor value as high as possible to attain peak system
efficiency. As the inductor value goes down to 10μH, the
efficiency drops to between 70% and 75%. With 56μH,
the efficiency exceeds 90% and there is little room for
improvement. At values greater than 100μH, the operation
of the synchronous rectifier becomes unreliable because
the inductor current is so small that it is difficult for the
control circuitry to detect.
After the appropriate inductor value is chosen, it is
necessary to find the minimum inductor current rating
required. Peak inductor current is determined from the
following formula:
I
T
V
L
L PEAK
(
ON MAX
(
IN MAX
(
MIN
)
)
)
=
×
(3)
When comparing various inductors, it is important to keep
in mind that suppliers use different criteria to determine
their ratings. Many use a conservative current level, where
inductance has dropped to 90% of its normal level. In any
case, it is a good idea to try inductors of various current
ratings with the ML4961 to determine which inductor is
the best choice. Check efficiency and maximum output
current, and if a current probe is available, look at the
inductor current to see if it looks like the waveform shown
in Figure 3. For additional information, see Application
Note 29.
Suitable inductors can be purchased from the following
suppliers:
Coilcraft
(708) 639-6400
Coiltronics
(407) 241-7876
Dale
(605) 665-9301
Sumida
(708) 956-0666
100
1.0
3.0
I
O
2.0
200
300
400
500
0
L = 10μH
L = 15μH
L = 27μH
L = 56μH
V
IN
(V)
ML4961(V
OUT
= 3.3V)
100
1.0
3.0
4.0
I
O
2.0
200
300
400
500
0
L = 10μH
L = 15μH
L = 27μH
L = 56μH
ML4961(V
OUT
= 5.0V)
V
IN
(V)
75%
1.0
3.0
4.0
E
O
2.0
80%
85%
90%
95%
70%
0
L = 10μH
L = 15μH
L = 27μH
L = 57μH
V
IN
(V)
ML4961-(V
OUT
= 5.0V)
70%
1
3
E
O
2
75%
80%
85%
90%
65%
0
L = 10μH
L = 15μH
L = 27μH
L = 56μH
V
IN
ML4961-(V
OUT
= 3.3V)
95%
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