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| 型号： | AS1341-BTDT |
| 厂商： | AUSTRIAMICROSYSTEMS AG |
| 元件分类： | DC/DC变换器 |
| 英文描述： | 20V, Hyst.600mA Buck Converter; Package Type: TDFN(3x3)-8 |
| 中文描述： | 20V的，600毫安，100％占空比，降压型转换器 |
| 封装： | TDFN(3x3)-8 |
| 文件页数： | 11/18页 |
| 文件大小： | 599K |
| 代理商： | AS1341-BTDT |
wwwaustriamcrosystems.com/DC-DC_Step-Down/AS1341
Revision 1.08
11 - 18
AS1341
Datasheet - Application Information
9.3 Setting Current Limit
The AS1341 adjustable peak current limt is set by connecting
ILIMIT as shown in
Table 4
.
The current limt chosen should reflect the maximumload current. The maximumoutput current is half of the peak current limt. Choosing a lower
current limt allows using an inductor with a lower current rating, however, it requires a higher inductance
(see Inductor Selection)
and does not
allow for reduced inductor package size.
9.4 Inductor Selection
The AS1341 operates with a wide range of inductance values. For most applications, values between 10μH and 47μH work best with the
controller’s high switching frequency. Larger inductor values will reduce the switching frequency and thereby improve efficiency and EMI.
Note:
The four key factors in inductor selection are inductance value, saturation rating, series resistance, and size.
The trade-off for improved efficiency is a higher output ripple and slower transient response. On the other hand, low-value inductors respond
faster to transients, improve output ripple, offer smaller physical size, and mnimze cost. If the inductor value is too small, the peak inductor
current exceeds the current limt due to current-sense comparator propagation delay, potentially exceeding the inductor’s current rating.
Calculate the mnimuminductance value as follows:
L
MIN
= ((V
INMAX
- V
OUTPUT
) x t
ONMIN
/I
LXPEAK
(EQ 3)
Where:
t
ONMIN
= 1μs
The inductor saturation current rating must be greater than the peak switch current limt, plus the overshoot due to the 250ns current-sense
comparator propagation delay. Saturation occurs when the magnetic flux density of the inductor reaches the maximumlevel the core can support
and the inductance starts to fall. Choose an inductor with a saturation rating greater than IPEAK in the following equation:
I
PEAK
= (I
LXPEAK
+ (V
IN
- V
OUTPUT
) x 250ns)/L
(EQ 4)
Inductor series resistance affects both efficiency and dropout voltage
(see Dropout Voltage on page 9)
. High series resistance limts the
maximumcurrent available at lower input voltages, and increases the dropout voltage. For optimumperformance, select an inductor with the
lowest possible DC resistance that fits in the allotted dimensions.
Table 4. Setting Peak Current Limt
Current Limit
ILIMIT Connected To
700mA
GND
1400mA
IN
Table 5. Recommended Inductors
Part Number
L
DCR
85m
Ω
125m
Ω
345m
Ω
360m
Ω
62m
Ω
57m
Ω
176m
Ω
215m
Ω
36m
Ω
150m
Ω
170m
Ω
400m
Ω
Current Rating
Manufacturer
MSS6132-103ML
10μH
1.4A
LPS4018-472ML4.7μH
1.8A
MSS6132-393ML
39μH
0.8A
LPS4018-223ML
22μH
0.7A
CDRH6D28NP-150
15μH
1.4A
Sumda
wwwsumda.com
CDRH5D18NP-4R1
4.1μH
1.95A
CDRH6D28NP-470
47μH
0.8A
CDRH5D18NP-220
22μH
0.8A
LQH66SN-100M03
10μH
1.6A
Murata
wwwmurata.com
LQH55DN-150M03
15μH
1.4A
LQH66SN-470M03
47μH
0.8A
LQH55DN-470M03
47μH
0.8A
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