- 您现在的位置：买卖IC网 > PDF目录20407 > DC1623A (Linear Technology)BOARD EVAL LTM8003 PDF资料下载
参数资料
| 型号： | DC1623A |
| 厂商： | Linear Technology |
| 文件页数： | 14/26页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LTM8003 |
| 软件下载： | LTM8033 Spice Model |
| 设计资源： | DC1623A Design Files |
| 标准包装： | 1 |
| 系列： | µModule® |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 3A |
| 输入电压： | 5.5 ~ 36 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 425kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM8033 |
LTM8033
APPLICATIONS INFORMATION
no-load condition, the percentage of time that the LTM8033
operates in sleep mode increases and the average input
current is greatly reduced, resulting in higher efficiency.
Burst Mode operation is enabled by tying SYNC to GND. To
disable Burst Mode operation, tie SYNC to a stable voltage
above 0.7V. Do not leave the SYNC pin floating.
Minimum Input Voltage
The LTM8033 is a step-down converter, so a minimum
amount of headroom is required to keep the output in
regulation. In addition, the input voltage required to turn
on is higher than that required to run, and depends upon
BIAS power whether RUN/SS is used. If BIAS is available
before V OUT ramps up, the minimum V IN voltage to start
may be reduced. As shown in the Typical Performance
Characteristics section, the minimum input voltage to
run a 3.3V output at light load is only about 3.6V, but, if
RUN/SS is pulled up to V IN , it takes 5.6V IN to start. If the
LTM8033 is enabled with the RUN/SS pin, the minimum
voltage to start at light loads is lower, about 4.2V. Similar
curves detailing this behavior of the LTM8033 for other
outputs are also included in the Typical Performance
Characteristics section.
Soft-Start
The RUN/SS pin can be used to soft-start the LTM8033,
reducing the maximum input current during start-up. The
RUN/SS pin is driven through an external RC filter to cre-
ate a voltage ramp at this pin. Figure 2 shows the start-up
and shutdown waveforms with the soft-start circuit. By
choosing an appropriate RC time constant, the peak start-
up current can be reduced to the current that is required to
regulate the output, with no overshoot. Choose the value
of the resistor so that it can supply at least 20μA when
the RUN/SS pin reaches 2.5V.
Frequency Foldback
The LTM8033 is equipped with frequency foldback which
acts to reduce the thermal and energy stress on the internal
power elements during a short-circuit or output overload
condition. If the LTM8033 detects that the output has fallen
out of regulation, the switching frequency is reduced as a
function of how far the output is below the target voltage.
This in turn limits the amount of energy that can be delivered
to the load under fault. During the start-up time, frequency
foldback is also active to limit the energy delivered to the
potentially large output capacitance of the load.
RUN
15k
0.22μF
RUN/SS
GND
INTERNAL
INDUCTOR
CURRENT
1A/DIV
V RUN/SS
2V/DIV
V OUT
2V/DIV
2ms/DIV
8033 F02
Figure 2. To Soft-Start the LTM8033, Add a Resistor and Capacitor to the RUN/SS Pin
8033fa
14
For more information www.linear.com/LTM8033
相关PDF资料 |
PDF描述 |
|---|---|
| 346-080-520-802 | CONNECTOR CARDEDGE 80POS .125 |
| CS8312YDR8 | IC PREDRIVER IGBT IGNITION 8SOIC |
| 346-080-520-202 | CARD EDGE CONN 80POS .125 X .250 |
| MKP1V120RL | SIDAC BIDIR 0.9A 120V DO41 |
| RCM12DCMD | CONN EDGECARD 24POS .156 WW |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DC1625A-A | 功能描述:BOARD DEMO FOR LTC4227-1 RoHS:是 类别:未定义的类别 >> 其它 系列:* 标准包装:1 系列:* 其它名称:MS305720A |
| DC1625A-B | 功能描述:BOARD DEMO FOR LTC4227-2 RoHS:是 类别:未定义的类别 >> 其它 系列:* 标准包装:1 系列:* 其它名称:MS305720A |
| DC1627 | 制造商:INTRONICS 制造商全称:INTRONICS 功能描述:15 Watt Triple Output DC-DC Converters |
| DC1627A-A | 制造商:Linear Technology 功能描述:EVAL BOARD FOR LTC4226-1 制造商:Linear Technology 功能描述:DEMO BOARD, LTC4226 HOT SWAP CONTROLLER, Silicon Manufacturer:Linear Technology, Silicon Core Number:LTC4226CUD-1, Kit Application Type:Power Management, Application Sub Type:Hot Swap Controller, Kit Contents:Demo Board LTC4226CUD-1 , RoHS Compliant: NA |
| DC1627A-B | 制造商:Linear Technology 功能描述:EVAL BOARD FOR LTC4226-2 制造商:Linear Technology 功能描述:DEMO BOARD, LTC4226 HOT SWAP CONTROLLER, Silicon Manufacturer:Linear Technology, Silicon Core Number:LTC4226CUD-2, Kit Application Type:Power Management, Application Sub Type:Hot Swap Controller, Kit Contents:Demo Board LTC4226CUD-2 , RoHS Compliant: NA |
发布紧急采购，3分钟左右您将得到回复。