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| 型号： | AS1340 EB |
| 厂商： | ams |
| 文件页数： | 13/17页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR AS1340 DC-DC |
| 设计资源： | Design Support Tool |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | Q6687728 |
AS1340
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9.7 Capacitor Selection
A 4.7μF capacitor is recommended for C IN as well as a 2μF for C OUT . Small-sized ceramic capacitors are recommended. X5R and X7R
ceramic capacitors are recommend as they retain capacitance over wide ranges of voltages and temperatures.
9.7.1
Output Capacitor Selection
Low ESR capacitors should be used to minimize V OUT ripple. Multi-layer ceramic capacitors are recommended since they have extremely low
ESR and are available in small footprints. A 2.2 to 10μF output capacitor is sufficient for most applications. Larger values up to 22μF may be
used to obtain extremely low output voltage ripple and improve transient response.
X5R and X7R dielectric materials are recommended due to their ability to maintain capacitance over wide voltage and temperature ranges.
Table 5. Recommended Output Capacitor
Part Number
GRM31MR71H105KA88
GRM32ER71H475KA88
C1206C105K5RAC
C1206C225K5RAC
1206C105KAT2A
C
1μF
4.7μF
1μF
2.2μF
1μF
TC Code
X7R
X7R
X7R
X7R
X7R
Rated Voltage
50V
50V
50V
50V
50V
Dimensions (L/W/T)
C1206
C1210
C1206
C1210
C1206
Murata
www.murata.com
Kemet
www.kemet.com
AVX
www.avx.com
9.7.2
Input Capacitor Selection
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic capacitors are
recommended for input decoupling and should be located as close to the device as is practical. A 4.7μF input capacitor is sufficient for most
applications. Larger values may be used without limitations.
Table 6. Recommended Input Capacitor
Part Number
GRM21BR71C105KA01
GRM21BR61C225KA88
GRM32DR71C106KA01
C
1μF
2.2μF
10μF
TC Code
X7R
X7R
X7R
Rated Voltage
16V
16V
16V
Dimensions (L/W/T)
C0805
C0805
C1210
Murata
www.murata.com
9.7.3
Diode Selection
A Schottky diode must be used to carry the output current for the time it takes the PMOS synchronous rectifier to switch on.
Note: Do not use ordinary rectifier diodes, since the slow recovery times will compromise efficiency.
Table 7. Recommended Diodes
Part Number
PMEG4010BEA
MBR0540
MBR0560
Reverse Voltage
40V
40V
60V
Forward Current
1A
500mA
500mA
Package
SOD123
SOD123
SOD123
Philips
MCC
www.mccsemi.com
9.8 Thermal Protection
To protect the device from short circuit or excessive power dissipation of the auxiliary NPNs, the integrated thermal protection switches off the
device when the junction temperature (T J ) reaches 145oC (typ). When T J decreases to approximately 125oC, the device will resume normal
operation. If the thermal overload condition is not corrected, the device will switch on and off while maintaining T J within the range between
125oC and 145oC.
www.ams.com/DC-DC_Step-Up/AS1340
Revision 1.20
13 - 17
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