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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： | 13/18页 |
| 文件大小： | 599K |
| 代理商： | AS1341-BTDT |
wwwaustriamcrosystems.com/DC-DC_Step-Down/AS1341
Revision 1.08
13 - 18
AS1341
Datasheet - Application Information
9.7 Input Capacitor
The input filter capacitor reduces peak currents drawn fromthe power source and reduces noise and voltage ripple on the input caused by the
circuit’s switching. The input capacitor must meet the ripple-current requirement (I
RMS
) imposed by the switching current defined as:
I
RMS
= (I
LOAD
x V
OUTPUT
)/V
IN
x
√
((4/3) x (V
IN
- V
OUTPUT
) - 1)
For most applications, non-tantalumtype (ceramc, alumnum polymer, or OS-CON) are preferred due to their robustness to high in-rush
currents typical of systems with low-impedance battery inputs. Alternatively, connect two (or more) smaller value low-ESR capacitors in parallel
to reduce cost. Choose an input capacitor that exhibits less than +10oC temperature rise at the RMS input current for optimal circuit life.
(EQ 10)
9.8 Diode Selection
The current in the D1
(see Figure 22 on page 10)
changes abruptly fromzero to its peak value each time the LX switch turns off. To avoid
excessive losses, the diode must have a fast turn-on time and a low forward voltage.
Note:
Ensure that the diode peak current rating exceeds the peak current limt set by the current limt
(see Setting Current Limt on page 11)
,
and that its breakdown voltage exceeds V
IN
. Schottky diodes are recommended.
9.9 Stable Operation
A well-designed systemand selection of high-quality external components can elimnate excessive noise on pins OUT, FB, or GND, which can
lead to unstable device operation. Instability typically manifests itself as grouped switching pulses with large gaps and excessive low-frequency
output ripple (motorboating) during no-load or light-load conditions.
9.10 Recommended Components
Table 7. Recommended Input Capacitor
C
TC Code
Rated Voltage
Manufacturer
10μF
X7R
25V
wwwmurata.comKemet
wwwkemet.com
Panasonic
wwwpanasonic.com
Sanyo
wwwedc.sanyo.com
Table 8. Recommended Components
Input Voltage
Output Voltage
ILIMIT
Inductor
Output Capacitor
4.5V to 20V
1.25V to 5V
High
MSS6132-103ML
LQH66SN-100M03
LQH55DN-150M03
CDRH6D28NP-150
T520V107M010ATE018
A700V826M006ATE018
T520B107M006ATE040
EEFUD0J101R
10TPB100ML
4.5v to 12V
CDRH5D18NP-4R1
LPS4018-472ML
4.5V to 20V
1.25V to 5V
Low
MSS6132-393ML
CDRH6D28NP-470
LQH66SN-470M03
LQH55DN-470M03
EEFCD0K330R
6TPB47M
T520A336M006ATE070
A700V226M006ATE028
4.5V to 12V
MSS6132-103ML
LPS4018-223ML
CDRH5D18NP-220
6V to 20V
5V to V
IN
High or Low
See Inductors above
510X107M020ATE040
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