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参数资料
型号： AS1329B-BTTT
厂商： AUSTRIAMICROSYSTEMS AG
元件分类： DC/DC变换器
英文描述： Adj. 315mA, 1.2MHz Boost feed.; Package Type: TSOT23-6; Miscellaneous: (light loads); Miscellaneous: Powersave Operation
中文描述： 低电压，微功耗，型DC - DC升压转换器
封装： TSOT23-6
文件页数： 12/21页
文件大小： 990K
代理商： AS1329B-BTTT
12 - 21
AS1329
Datasheet - Application Information
9.1 Output Voltage Ripple
The AS1329 is designed to work at high efficiency. In order to reduce the output ripple the following improvements are recommended:
!
Use a higher output capacitor, up to 44μF and a higher input capacitor (22μF).
!
Use smaller values for the resistor divider. R1 should be about 300k
Ω
. To avoid a high leakage current frompin VOUT through the resistor
divider to GND, R1 should not be less than 100k
Ω
..
!
To reduce the output ripple it’s also possible to speed up the feedback loop. To achieve this, place a 22pF (C4 in
Figure24
) capacitor in
parallel to R1. Via C4 the fast transients are shorted to the FB pin and the feedback loop is even faster. A 1M
Ω
resistor for R1 slows down
the FB loop.
!
Due to noise and to their non linear behavior, the use of potentiometers is not recommended.
Figure 24. AS1329 - Typical Application for lower Output Voltage Ripple
Note:
For correct measurements of the output ripple connect the oscilloscope probe as close as possible to the positive plate of the C
OUT
and connect the GND of the oscilloscope probe to the negative plate of the C
OUT
. This will reduce the inductive coupling and will
deliver a more accurate measurement result.
The output ripple is getting higher as V
IN
is getting closer to V
OUT
.
Figure25
shows that the above mentioned improvements reduce the output
voltage ripple. If V
IN
is higher than V
OUT
the AS1329 stops switching and V
IN
is connected to V
OUT
via the inductor and the internal P-FET.
Figure 25. Output Voltage Ripple vs. Input Voltage; V
OUT
= 2.8V, I
OUT
= 0.8mA
125
AS1329
C
2
22μF
R
2
196k
Ω
R
1
250k
Ω
On
Off
L1
4.7μH
2xAA Battery
C
1
22μF
V
OUT
= 2.8V
GND
2
SW
1
4
SHDNN
3
FB
5
VOUT
C
3
22μF
C
4
22pF
6
VIN
0
25
50
75
100
0.5
1
1.5
Input Voltage (V)
2
2.5
3
3.5
O
Cout = 44μF
Cout = 66μF
Cout = 44μF + C4 = 22pF
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相关代理商/技术参数
参数描述
AS1329B-EB 制造商:ams 功能描述:AS1329B Evaluation Board
AS1329B-TT_EK_ST 功能描述:AS1329B - DC/DC, Step Up 1, Non-Isolated Outputs Evaluation Board 制造商:ams 系列:- 零件状态:有效 主要用途:DC/DC，步升 输出和类型:1，非隔离 功率 - 输出:- 电压 - 输出:3.3V 或 5V 电流 - 输出:570mA 电压 - 输入:0.85 V ~ 5 V 稳压器拓扑:升压 频率 - 开关:1.2MHz 板类型:完全填充 所含物品:板 使用的 IC/零件:AS1329B 标准包装:1
AS1329C 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:Low Voltage, Micropower, DC-DC Step-Up Converters
AS1329C EB 功能描述:BOARD EVAL AS1329C RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
AS1329CBTTT 制造商:AMS 功能描述:IC STEP-UP DC/DC CONVERTER 6-SOT-23
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