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参数资料
| 型号： | DC1560A |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR LTM8048 |
| 产品培训模块： | LTM8047 and LTM8048 1.5W, 725 VDC Isolated Micromodule Converter |
| 设计资源： | DC1560A Design File DC1560A Schematic |
| 标准包装： | 1 |
| 系列： | µModule® |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 2，隔离 |
| 输出电压： | 5V，6V |
| 电流 - 输出： | 300mA |
| 输入电压： | 4.5 ~ 30 V |
| 稳压器拓扑结构： | 回扫 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM8048 |
LTM8048
APPLICATIONS INFORMATION
For most applications, the design process is straight
forward, summarized as follows:
1. Look at Table 1a (or Table 1b, if the post linear regula-
tor is used) and find the row that has the desired input
range and output voltage.
2. Apply the recommended C IN , C OUT1 , C OUT2 , R ADJ1 ,
R ADJ2 and C BYP if required.
3. Connect BIAS as indicated, or tie to an external source
up to 15V or V IN , whichever is less.
While these component combinations have been tested for
proper operation, it is incumbent upon the user to verify
proper operation over the intended system’s line, load and
environmental conditions. Bear in mind that the maximum
output current may be limited by junction temperature,
the relationship between the input and output voltage
magnitude and polarity and other factors. Please refer
to the graphs in the Typical Performance Characteristics
section for guidance.
Capacitor Selection Considerations
The C IN , C OUT1 and C OUT2 capacitor values in Table 1 are
the minimum recommended values for the associated op-
erating conditions. Applying capacitor values below those
indicated in Table 1 is not recommended, and may result
in undesirable operation. Using larger values is generally
acceptable, and can yield improved dynamic response, if
it is necessary. Again, it is incumbent upon the user to
verify proper operation over the intended system’s line,
load and environmental conditions.
Ceramic capacitors are small, robust and have very low
ESR. However, not all ceramic capacitors are suitable.
X5R and X7R types are stable over temperature and ap-
plied voltage and give dependable service. Other types,
including Y5V and Z5U have very large temperature and
voltage coefficients of capacitance. In an application cir-
cuit they may have only a small fraction of their nominal
capacitance resulting in much higher output voltage ripple
than expected.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8048. A
ceramic input capacitor combined with trace or cable
inductance forms a high-Q (underdamped) tank circuit. If
the LTM8048 circuit is plugged into a live supply, the input
voltage can ring to much higher than its nominal value,
possibly exceeding the device’s rating. This situation is
easily avoided; see the Hot-Plugging Safely section.
LTM8048 Table 1a. Recommended Component Values and Configuration for Specific V OUT1 Voltages (T A = 25°C)
V IN
3.1V to 32V
3.1V to 32V
3.1V to 29V
3.1V to 26V
3.1V to 24V
9V to 15V
9V to 15V
9V to 15V
9V to 15V
9V to 15V
18V to 32V
18V to 32V
18V to 29V
18V to 26V
18V to 24V
V OUT1
2.5V
3.3V
5V
8V
12V
2.5V
3.3V
5V
8V
12V
2.5V
3.3V
5V
8V
12V
V BIAS
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
V IN
V IN
V IN
V IN
V IN
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
C IN
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 25V, 0805
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 25V, 0805
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
C OUT1
100μF, 6.3V, 1210
100μF, 6.3V, 1210
22μF, 16V, 1210
22μF, 10V, 1206
10μF, 16V, 1210
100μF, 6.3V, 1210
47μF, 6.3V, 1210
22μF, 16V, 1210
22μF, 10V, 1206
10μF, 16V, 1210
100μF, 6.3V, 1210
47μF, 6.3V, 1210
22μF, 16V, 1210
22μF, 10V, 1206
10μF, 16V, 1210
R ADJ1
12.4k
10k
6.98k
4.53k
3.16k
12.4k
10k
6.98k
4.53k
3.16k
12.4k
10k
6.98k
4.53k
3.16k
Note: Do not allow BIAS to exceed V IN , a bulk input capacitor is required.
8048ff
10
For more information www.linear.com/LTM8048
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