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参数资料
| 型号： | DC1307A |
| 厂商： | Linear Technology |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LTM8027 |
| 软件下载： | LTM8027 Spice Model |
| 设计资源： | DC1307A Design Files DC1307A Schematic |
| 标准包装： | 1 |
| 系列： | LTM®, uModule® |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 功率 - 输出： | 48W |
| 输出电压： | 12V |
| 电流 - 输出： | 4A |
| 输入电压： | 16 ~ 60 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM8027 |
| 相关产品： | LTM8027IV#PBF-ND - IC BUCK SYNC ADJ 4A 113LGA LTM8027MPV#PBF-ND - IC BUCK SYNC ADJ 4A 113LGA LTM8027EV#PBF-ND - IC BUCK SYNC ADJ 4A 113LGA |
LTM8027
APPLICATIONS INFORMATION
R A = R B ? ?
– 1 ?
Table1liststypicalresistorvaluesforcommonoperating
frequencies.
Table 1. R T Resistor Values vs Frequency
R T (kΩ) f SW (kHz)
187 100
118 150
82.5 200
63.4k 250
48.7k 300
40.2k 350
31.6k 400
27.4k 450
23.7k 500
It is recommended that the user apply the R T value given
in Table 2 for the input and output operating condition.
System level or other considerations, however, may neces-
sitate another operating frequency. While the LTM8027 is
flexible enough to accommodate a wide range of operat-
ing frequencies, a haphazardly chosen one may result
in undesirable operation under certain operating or fault
conditions. A frequency that is too high can damage the
LTM8027 if the output is overloaded or short-circuited. A
frequency that is too low can result in a final design that has
too much output ripple or too large of an output capacitor.
The maximum frequency (f MAX ) at which the LTM8027
should be allowed to switch and the minimum frequency
set resistor value that should be used for a given set of
input and output operating condition is given in Table 2
as R T(MIN) . There are additional conditions that must be
satisfied if the synchronization function is used. Please
refer to the Synchronization section for details.
Output Voltage Programming
The LTM8027 regulates its ADJ pin to 1.23V. Connect the
adjust resistor from this pin to ground. The value of R ADJ
is given by the equation R ADJ = 613.77/(V OUT – 1.23),
where R ADJ is in kΩ.
RUN Control
The LTM8027 RUN pin uses a reference threshold of 1.4V.
This precision threshold allows use of the RUN pin for both
logic-level controlled applications and analog monitor-
ing applications such as power supply sequencing. The
LTM8027 operational status is primarily controlled by a
UVLO circuit on internal power source. When the LTM8027
is enabled via the RUN pin, only the internal regulator
(INTV CC ) is enabled. Switching remains disabled until
the UVLO threshold is achieved at the BIAS1 pin, when
the remainder of the LTM8027 is enabled and switching
commences.
Because the LTM8027 high power converter is a power
transfer device, a voltage that is lower than expected on
the input supply could require currents that exceed the
sourcing capabilities of that supply, causing the system
to lock up in an undervoltage state. Input supply start-
up protection can be achieved by enabling the RUN pin
using a resistive divider from the V IN supply to ground.
Setting the divider output to 1.4V when that supply is at
an adequate voltage prevents an LTM8027 converter from
drawing large currents until the input supply is able to
provide the required power. 200mV of input hysteresis on
the RUN pin allows for about 15% of input supply droop
before disabling the converter.
Input UVLO and RUN
The RUN pin has a precision voltage threshold with hys-
teresis which can be used as an undervoltage lockout
threshold (UVLO) for the power supply. Undervoltage
lockout keeps the LTM8027 in shutdown until the supply
input voltage is above a certain voltage programmed by
the user. The hysteresis voltage prevents noise from falsely
tripping UVLO. Resistors are chosen by first selecting R B
(refer to Figure 2). Then:
? V IN(ON) ?
? 1.4V ?
where V IN(ON) is the input voltage at which the undervolt-
age lockout is disabled and the supply turns on.
8027fb
13
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| DC1319B-A | 功能描述:BOARD EVAL LED DRIVER LT3756 RoHS:否 类别:编程器，开发系统 >> 评估板 - LED 驱动器 系列:- 标准包装:1 系列:PowerWise® 电流 - 输出 / 通道:20mA 输出及类型:1，非隔离 输出电压:17V 特点:可调光 输入电压:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相关产品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
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