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参数资料
| 型号： | DC1307A |
| 厂商： | Linear Technology |
| 文件页数： | 11/22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
For most applications, the design process is straight
forward, summarized as follows:
1. Look at Table 2 and find the row that has the desired
input range and output voltage.
2. Apply the recommended C IN , C OUT , R ADJ and R T values.
3. Connect the BIAS pins as indicated.
While these component and connection 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.
Capacitor Selection Considerations
The C IN and C OUT capacitor values in Table 2 are the
minimum recommended values for the associated oper-
ating conditions. Applying capacitor values below those
indicated in Table 2 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 LTM8027. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (under damped) tank circuit.
If the LTM8027 circuit is plugged into a live supply, the
input voltage can ring to twice its nominal value, possi-
bly exceeding the device’s rating. This situation is easily
avoided; see the Hot-Plugging Safely section.
Input Power Requirements
The LTM8027 is biased using an internal linear regulator
to generate operational voltages from the V IN pin. Virtually
all of the circuitry in the LTM8027 is biased via this internal
linear regulator output (INTV CC on the Block Diagram).
This pin is internally decoupled with a low ESR capacitor
to GND. The INTV CC regulator generates an 8V output
provided there is ample voltage on the V IN pin. The INTV CC
regulator has approximately 1V of dropout, and will follow
the V IN pin with voltages below the dropout threshold.
The LTM8027 has a typical start-up requirement of V IN >
7.5V. This assures that the onboard regulator has ample
headroom to bring the internal regulator (INTV CC ) above
its UVLO threshold. The INTV CC regulator can only source
current, so forcing the BIAS1 pin above 8.5V allows use
of externally derived power for the IC. This effectively
shuts down the internal linear regulator and reduces
power dissipation within the LTM8027. Using the onboard
regulator for start-up, then applying power to BIAS1 from
the converter output or external supply maximizes con-
version efficiencies and is a common practice. If IBIAS1
is maintained above 6.5V using an external source, the
LTM8027 can continue to operate with V IN as low as 4.5V.
BIAS Power
The internal circuitry of the LTM8027 is powered by the
INTV CC bus, which is derived either from the afore men-
tioned internal linear regulator or the BIAS1 pin, if it is
greater than 8.5V. Since the internal linear regulator is by
nature dissipative, deriving INTV CC from an external source
through the BIAS pins reduces the power lost within the
LTM8027 and can increase overall system efficiency.
8027fb
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相关代理商/技术参数 |
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| DC1307B | 制造商:Linear Technology 功能描述:DEMO BOARD, LTM8027 BUCK REGULATOR, Silicon Manufacturer:Linear Technology, Sili 制造商:Linear Technology 功能描述:DEMO BOARD, LTM8027 BUCK REGULATOR, Silicon Manufacturer:Linear Technology, Silicon Core Number:LTM8027, Kit Application Type:Power Management - Voltage Regulator, Application Sub Type:Buck Regulator, Kit Contents:Demo Board LTM8027 , RoHS Compliant: NA |
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| DC1319A-B | 功能描述:BOARD EVAL LED DRIVER LT3756-1 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 |
| 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 |
| DC1319B-B | 制造商:Linear Technology 功能描述:EVAL BOARD, LT3756-1 LED DRIVER, Topology:Boost, Buck, Buck-Boost, SEPIC, No. of 制造商:Linear Technology 功能描述:EVAL BOARD, LT3756-1 LED DRIVER, Topology:Boost, Buck, Buck-Boost, SEPIC, No. of Outputs:1, Input Voltage Min:6V, Input Voltage Max:100V, Dimming Control Type:PWM, Kit Contents:Eval Board LT3756EMSE-1 , RoHS Compliant: NA |
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