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参数资料
| 型号： | DC1195A |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO LTM8023 |
| 软件下载： | LTM8023 Spice Model |
| 设计资源： | DC1195A Schematic |
| 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： | 2A |
| 输入电压： | 5 ~ 36 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM8023 |
| 相关产品： | LTM8023MPV#PBF-ND - IC BUCK SYNC ADJ 2A 50LGA LTM8023IV#PBF-ND - IC BUCK SYNC ADJ 2A 50LGA LTM8023EV#PBF-ND - IC BUCK SYNC ADJ 2A 50LGA |
LTM8023
APPLICATIONS INFORMATION
V RUN/SS
GND
Soft-Start
The RUN/SS pin can be used to soft-start the LTM8023,
reducing the maximum input current during start-up.
The RUN/SS pin is driven through an external RC filter
to create a voltage ramp at this pin. Figure 3 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.
I L
RUN 1A/DIV
15k
RUN/SS
2V/DIV
0.22μF
Shorted Input Protection
Care needs to be taken in systems where the output will be
held high when the input to the LTM8023 is absent. This
may occur in battery charging applications or in battery
backup systems where a battery or some other supply is
diode OR-ed with the LTM8023’s output. If the V IN pin is
allowed to float and the RUN/SS pin is held high (either
by a logic signal or because it is tied to V IN ), then the
LTM8023’s internal circuitry will pull its quiescent cur-
rent through its internal power switch. This is fine if your
system can tolerate a few milliamps in this state. If you
ground the RUN/SS pin, the internal power switch cur-
rent will drop to essentially zero. However, if the V IN pin
is grounded while the output is held high, then parasitic
diodes inside the LTM8023 can pull large currents from
the output through the V IN pin. Figure 4 shows a circuit
that will run only when the input voltage is present and
that protects against a shorted or reversed input.
V OUT
2V/DIV
V IN
V IN
V OUT
V OUT
RUN/SS
AUX
2ms/DIV
Figure 3. To Soft-Start the LTM8023, Add a
Resistor and Capacitor to the RUN/SS Pin
8023 F03
LTM8023
R T SYNC GND
BIAS
ADJ
8023 F04
Synchronization
The internal oscillator of the LTM8023 can be synchronized
by applying an external 250kHz to 2MHz clock to the SYNC
pin. Do not leave this pin floating. The resistor tied from the
R T pin to ground should be chosen such that the LTM8023
oscillates 20% lower than the intended synchronization
frequency (see the Frequency Selection section).
Figure 4. The Input Diode Prevents a Shorted Input from
Discharging a Backup Battery Tied to the Output. It Also Protects
the Circuit from a Reversed Input. The LTM8023 Runs Only When
the Input is Present.
The LTM8023 will not enter Burst Mode operation while
synchronized to an external clock, but will instead skip
pulses to maintain regulation.
8023fi
For more information www.linear.com/LTM8023
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DC1198A-A | 功能描述:BOARD EVAL LTM4605 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:µModule® 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| DC1198A-B | 功能描述:BOARD DEMO LTM4607 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:LTM®, uModule® 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| DC1198B-A | 制造商:Linear Technology 功能描述:BOARD DEMO LTM4605EV 制造商:Linear Technology 功能描述:DEMO BOARD, LTM4605 BUCK/BOOST REGULATOR, Silicon Manufacturer:Linear Technology, Silicon Core Number:LTM4605, Kit Application Type:Power Management - Voltage Regulator, Application Sub Type:Buck/Boost Regulator , RoHS Compliant: NA |
| DC1198B-B | 制造商:Linear Technology 功能描述:BOARD DEMO LTM4607EV 制造商:Linear Technology 功能描述:DEMO BOARD, LTM4607 BUCK/BOOST REGULATOR 制造商:Linear Technology 功能描述:DEMO BOARD, LTM4607 BUCK/BOOST REGULATOR, Silicon Manufacturer:Linear Technology, Silicon Core Number:LTM4607, Kit Application Type:Power Management - Voltage Regulator, Application Sub Type:Buck/Boost Regulator , RoHS Compliant: NA |
| DC119R | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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