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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： | 12/18页 |
| 文件大小： | 599K |
| 代理商： | AS1341-BTDT |
wwwaustriamcrosystems.com/DC-DC_Step-Down/AS1341
Revision 1.08
12 - 18
AS1341
Datasheet - Application Information
9.5 Maximum Output Current
The AS1341 output current determnes the regulator’s switching frequency. When the converter approaches continuous mode, the output
voltage falls out of regulation. For the typical application, the maximumoutput current is approximately:
I
LOADMAX
= 1/2 x I
LXPEAKMIN
(EQ 5)
For low-input voltages, the maximumon-time may be reached and the load current is limted by:
I
LOAD
= (1/2 x (V
IN
- V
OUT
) x 10μs)/L
(EQ 6)
9.6 Output Capacitor
Choose the output capacitor to service the maximumload current with acceptable voltage ripple. The output ripple has two components:
variations in the charge stored in the output capacitor with each LX pulse, and the voltage drop across the capacitor’s equivalent series
resistance (ESR) caused by the current into and out of the capacitor:
V
RIPPLE
V
RIPPLEESR
+ V
RIPPLEC
The output voltage ripple as a consequence of the ESR and output capacitance is:
(EQ 7)
V
RIPPLEESR
= ESR x I
PEAK
(EQ 8)
(EQ 9)
V
RIPPLEC
= (L x (I
PEAK
- I
OUTPUT
)2)/(2 x (C
OUT
x V
OUTPUT
)) x V
IN
/(V
IN
- V
OUTPUT
)
Where:
I
PEAK
is the peak inductor current
(see Inductor Selection on page 11)
. The worst-case ripple occurs at no-load.
Equations
EQ7
,
EQ8
, and
EQ9
are suitable for initial capacitor selection, but actual values should be set by testing a prototype or evaluation
circuit. As a general rule, a smaller amount of charge delivered in each pulse results in less output ripple. Since the amount of charge delivered
in each oscillator pulse is determned by the inductor value and input voltage, the voltage ripple increases with larger inductance, and as the
input voltage decreases.
Table 6. Recommended Output Capacitor
Part Number
C
ESR
18m
Ω
18m
Ω
40m
Ω
70m
Ω
28m
Ω
40m
Ω
15m
Ω
18m
Ω
55m
Ω
70m
Ω
Rated Voltage
Manufacturer
T520V107M010ATE018
100μF
10V
A700V826M006ATE01882μF
6.3V
T520B107M006ATE040
100μF
6V
T520A336M006ATE070
33μF
6.3V
A700V226M006ATE028
22μF
6.3V
510X107M020ATE040
10μF
20V
EEFUD0J101R
100μF
6.3V
Panasonic
wwwpanasonic.com
EEFCD0K330R
33μF
8V
10TPB100ML
100μF
10V
Sanyo
wwwedc.sanyo.com
6TPB47M
47μF
6.3V
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