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参数资料
| 型号： | AS1340 EB |
| 厂商： | ams |
| 文件页数： | 10/17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 Application Information
The AS1340 has an operating voltage range from 2.7 to 5.5V. If the inductor is supplied from the same source the battery disconnect switch can
be used as well (see Figure 1 on page 1) . In case that a input voltage source is higher than 5.5V, the inductor can be supplied separately up to
50V (see Figure 28) , but then the battery disconnect switch cannot be used, because its operating voltage range is limited to 5.5V.
9.2 Shutdown
A logic low on pin EN shuts down the AS1340 and a logic high on EN powers on the device.
In shutdown mode the supply current drops to below 1μA to maximize battery life. In case that the battery disconnect switch is used, the battery
is disconnected from the output during shutdown.
Note: Pin EN should not be left floating. If the shutdown feature is not used, connect EN to V IN .
9.3 Battery Disconnect
The AS1340 has an integrated switch that can be used to disconnect the battery during shutdown. The operation voltage of this switch is limited
to 5.5V. When EN is high, the switch is closed and supplies the inductor. Due to the R ON resistance the efficiency is slightly lower if the battery
disconnect switch is used.
P LOSS = I IN 2 x R ON
9.4 Setting Output Voltage
Output voltage can be adjusted by connecting a voltage divider between pins LX and FB (see Figure 28) .
Figure 28. Typical Application (SWVIN and SWOUT not in use)
Supply
(EQ 1)
2.7V to V OUT
C IN
10μF
3
6
L 1
4.7μH
V IN = 2.7V
to 5.5V
C 1
0.1μF
2
VCC
SWVIN
SWOUT
5
LX
D1
R 1
2.2M ?
C OUT
1μF
V OUT = 18V
4
POK
AS1340
8
FB
On
Off
1
EN
R 2
165k ?
7,9
GND
The output voltage can be adjusted by selecting different values for R 1 and R 2 . For R 2 , select a value between 10k and 200k ? .
Calculate R 1 by:
R 1 = R 2 ? ? ------------- – 1 ?
? V FB
V OUT
?
(EQ 2)
Where:
V OUT = V IN to 50V, V FB = 1.25V
The input bias current of FB has a maximum value of 100nA which allows for large-value resistors. For less than 1% error, the current through R 2
should be 100 times the feedback input bias current (I FB ).
www.ams.com/DC-DC_Step-Up/AS1340
Revision 1.20
10 - 17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1341 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:20V, 600mA, 100% Duty Cycle, Step-Down Converter |
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| AS1341_1 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:20V, 600mA, 100% Duty Cycle, Step-Down Converter |
| AS1341-BTDM | 功能描述:Buck Switching Regulator IC Positive Adjustable (Fixed) 1.25V (5V) 1 Output 600mA 8-WDFN Exposed Pad 制造商:ams 系列:- 包装:带卷（TR） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可调（固定） 输出数:1 电压 - 输入（最小值）:4.5V 电压 - 输入（最大值）:20V 电压 - 输出（最小值/固定）:1.25V（5V） 电压 - 输出（最大值）:20V 电流 - 输出:600mA 频率 - 开关:200kHz 同步整流器:无 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商器件封装:8-TDFN（3x3） 标准包装:1,000 |
| AS1341BTDT | 制造商:AMS 功能描述:IC STEP-DOWN DC/DC CONVERTER TDFN-8 制造商:AMS 功能描述:IC, STEP-DOWN DC/DC CONVERTER, TDFN-8 制造商:AMS 功能描述:IC, STEP-DOWN DC/DC CONVERTER, TDFN-8; Primary Input Voltage:12V; No. of Outputs:1; Output Voltage:20V; Output Current:600mA; No. of Pins:8; Operating Temperature Min:-40C; Operating Temperature Max:85C; Output Current Max:600mA ;RoHS Compliant: Yes |
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