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AS1341-BTDT-1K 参数 Datasheet PDF下载

AS1341-BTDT-1K图片预览
型号: AS1341-BTDT-1K
PDF下载: 下载PDF文件 查看货源
内容描述: 650毫安,UL吨RA低纹波降压DC / DC CONVER器 [650mA, Ul t ra low Ripple Step Down DC/DC Conver ter]
分类和应用:
文件页数/大小: 18 页 / 990 K
品牌: AMSCO [ AMS(艾迈斯) ]
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AS1341  
Datasheet - Application Information  
9.5 Maximum Output Current  
The AS1341 output current determines the regulator’s switching frequency. When the converter approaches continuous mode, the output  
voltage falls out of regulation. For the typical application, the maximum output current is approximately:  
I
LOADMAX = 1/2 x ILXPEAKMIN  
(EQ 5)  
(EQ 6)  
For low-input voltages, the maximum on-time may be reached and the load current is limited by:  
LOAD = (1/2 x (VIN - VOUT) x 10µs)/L  
I
9.6 Output Capacitor  
Choose the output capacitor to service the maximum load 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:  
VRIPPLE  
VRIPPLEESR + VRIPPLEC  
(EQ 7)  
The output voltage ripple as a consequence of the ESR and output capacitance is:  
V
RIPPLEESR = ESR x IPEAK  
(EQ 8)  
(EQ 9)  
V
RIPPLEC = (L x (IPEAK - IOUTPUT)2)/(2 x (COUT x VOUTPUT)) x VIN/(VIN - VOUTPUT  
)
Where:  
PEAK is the peak inductor current (see Inductor Selection on page 11). The worst-case ripple occurs at no-load.  
I
Equations EQ 7, EQ 8, and EQ 9 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 determined 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  
T520V107M010ATE018  
A700V826M006ATE018  
T520B107M006ATE040  
T520A336M006ATE070  
A700V226M006ATE028  
510X107M020ATE040  
EEFUD0J101R  
C
ESR  
Rated Voltage  
10V  
Manufacturer  
Kemet  
100µF  
82µF  
100µF  
33µF  
22µF  
10µF  
100µF  
33µF  
100µF  
47µF  
18mΩ  
18mΩ  
40mΩ  
70mΩ  
28mΩ  
40mΩ  
15mΩ  
18mΩ  
55mΩ  
70mΩ  
www.kemet.com  
6.3V  
6V  
6.3V  
6.3V  
20V  
Panasonic  
www.panasonic.com  
6.3V  
8V  
EEFCD0K330R  
Sanyo  
10TPB100ML  
10V  
www.edc.sanyo.com  
6TPB47M  
6.3V  
www.ams.com/DC-DC_Step-Up/AS1341  
Revision 1.09  
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