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参数资料
| 型号： | DC823B-A |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LTM4600 |
| 设计资源： | DC823B-A Design Files DC823B-A 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： | 0.6V，1.2V，1.5V，1.8V，2.5V，3.3V，和 5V |
| 电流 - 输出： | 10A |
| 输入电压： | 4.5 ~ 20V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1.35MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM4600 |
| 相关产品： | LTM4600IV#PBF-ND - IC DC/DC UMODULE 10A 104-LGA LTM4600EV#PBF-ND - IC DC/DC UMODULE 10A 104-LGA |
LTM4600
APPLICATIONS INFORMATION
Layout Checklist/Example
The high integration of the LTM4600 makes the PCB board
layout very simple and easy. However, to optimize its electri-
cal and thermal performance, some layout considerations
are still necessary.
? Use large PCB copper areas for high current path, in-
cluding V IN , PGND and V OUT . It helps to minimize the
PCB conduction loss and thermal stress
? Place high frequency ceramic input and output capaci-
tors next to the V IN , PGND and V OUT pins to minimize
high frequency noise
? Place a dedicated power ground layer underneath
the unit
? To minimize the via conduction loss and reduce module
thermal stress, use multiple vias for interconnection
between top layer and other power layers
? Do not put a via directly on pad unless it is capped
? Use a separated SGND ground copper area for com-
ponents connected to signal pins. Connect the SGND
to PGND underneath the unit
Figure 16 gives a good example of the recommended
layout.
LTM4600 Frequency Adjustment
The LTM4600 is designed to typically operate at 850kHz
across most input and output conditions. The control ar-
chitecture is constant on time valley mode current control.
The f ADJ pin is typically left open or decoupled with an
optional 1000pF capacitor. The switching frequency has
been optimized to maintain constant output ripple over the
operating conditions. The equations for setting the operat-
ing frequency are set around a programmable constant on
time. This on time is developed by a programmable current
into an on board 10pF capacitor that establishes a ramp
that is compared to a voltage threshold equal to the output
voltage up to a 2.4V clamp. This I ON current is equal to:
I ON = (V IN – 0.7V)/110k, with the 110k onboard resistor
from V IN to f ADJ . The on time is equal to t ON = (V OUT /I ON )
? 10pF and t OFF = t s – t ON . The frequency is equal to: Freq.
= DC/t ON . The I ON current is proportional to V IN , and the
regulator duty cycle is inversely proportional to V IN , there-
fore the step-down regulator will remain relatively constant
frequency as the duty cycle adjustment takes place with
lowering V IN . The on time is proportional to V OUT up to a
2.4V clamp. This will hold frequency relatively constant
with different output voltages up to 2.4V. The regulator
switching period is comprised of the on time and off time
as depicted in Figure 17.
V IN
C IN
PGND
V OUT
4600 F16
LOAD
TOP LAYER
Figure 16. Recommended PCB Layout
4600fc
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DC823B-B | 功能描述:BOARD EVAL LTM4600HV 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 |
| DC826A-B | 制造商:Linear Technology 功能描述:EVAL BOARD, LTC2951-2 PUSH BUTTON ON/OFF CTRL, Silicon Manufacturer:Linear Techn |
| DC826B-A | 功能描述:BOARD EVAL LTC2950 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| DC826B-A | 制造商:Linear Technology 功能描述:EVAL BOARD, LTC2950-2 PUSH BUTTON ON/OFF |
| DC826B-B | 功能描述:BOARD EVAL LTC2950 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
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