參數(shù)資料
型號(hào)： AS1341-BTDT
廠商： AUSTRIAMICROSYSTEMS AG
元件分類： DC/DC變換器
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，降壓型轉(zhuǎn)換器
封裝： TDFN(3x3)-8
文件頁數(shù)： 13/18頁
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.com
wwwt-yuden.com
相關(guān)PDF資料
PDF描述
AS1343A-BTDT-10 42V, 1MHz, Single Cell, Boost; Package Type: TDFN(3x3)-10; Temperature Range: -40 - +85 °C; Dimension: 3 x 3 mm; Shutdown: Yes; Output Current: 140mA; Output Range: 5.5 to 42V; Supply Voltage: 0,90-3,60
AS1344-BTDT 42V DCDC for OLED; Package Type: TDFN(3x3)-10
AS1351-T Dual LDO with OTP 1.8 to 3.3V; Package Type: QFN(3x3)-12; Output Range: 2 x 3,3V
AS1352-7BC0-T Quad LDO with OTP 1.8 to 3.3V; Package Type: QFN(4x4)-12; Output Range: 1,8V; Output Range: 2,5V; Output Range: 2,9V; Output Range: 3,0V
AS1352-C0CF-T Quad LDO with OTP 1.8 to 3.3V; Package Type: QFN(4x4)-12; Output Range: 1,8V; Output Range: 2 x 3,0V; Output Range: 3,3V
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