- 您现在的位置：买卖IC网 > PDF目录15517 > MIC2155YML TR (Micrel Inc)IC REG CTRLR BUCK PWM VM 32MLF PDF资料下载
参数资料
| 型号： | MIC2155YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/35页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32MLF |
| 特色产品： | MIC2155/6 Buck Control IC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 80% |
| 电源电压： | 4.5 V ~ 14.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘，32-MLF? |
| 包装： | 标准包装 |
| 产品目录页面： | 1091 (CN2011-ZH PDF) |
| 其它名称： | 576-3527-6 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
Micrel, Inc.
Functional Description
The MIC2155 and MIC2156 are two-phase, synchronous
buck controllers operating at a fixed frequency. The two
controllers differ only in switching frequency with the
MIC2155 switching at 500kHz per phase (1MHz at the
input and output) and the MIC2156 switches at 300kHz
per phase.
Some of the advantages of multi-phase operation are:
? Smaller input and output filtering components are
required because of current cancelation and higher
input and output frequency.
? Faster transient response is possible with smaller
output filter component values.
? Load current through each phase is one half the total
output current, which allows for even heat distribution
and smaller components.
? Control circuitry forces better current sharing in the
MOSFETs than paralleling FETs in a single phase
application.
The controller utilizes a voltage-mode control scheme
(VMC). Lossless current sharing is accomplished by
sensing the DC voltage across each inductor winding.
Lossless overcurrent protection is performed by sensing
the voltage across the low-side MOSFET on-resistance
during the off-time.
Other features of the controller are:
? Overvoltage protection
? Soft start
? UVLO
? Enable
? Remote sensing
? Pre-biased output startup
? Multiple input supplies
? Power Good signal
? Frequency synchronization
Startup
A typical startup sequence is shown in Error! Reference
source not found. (also refer to the block diagram). The
enable pins are asserted after V IN is applied. V DD is
immediately turned on and an internal FET releases the
soft start pin. The soft start pin controls the error
amplifier voltage. As V SS ramps up, it reaches a
threshold where the gate drive is enabled and the
MOSFETs start to switch at a very low duty cycle. The
rise of the soft start voltage controls the increase in V OUT
by gradually allowing the COMP1 pin voltage to rise. A
10mV offset in the current controller keeps the Channel
2 low-side drive off when the output current is low to
prevent current from circulating between the phases.
PGOOD is asserted when V OUT reaches the PGOOD
threshold.
MIC2155/2156
Figure 1. Startup Sequence
A typical output voltage and inductor current startup is
shown in Figure 2.
Channel 1
Channel 2
Time (4ms/div)
Figure 2. Turn On
Soft Start
The soft-start capacitor controls how fast the output
voltage rises by controlling the COMP pin risetime.
Without soft start a fast or uncontrolled turn-on requires
a higher current from the input source to charge up the
output capacitance.
The soft-start capacitor also controls the delay time
between the enable pin assertion to when V OUT starts to
rise. Figures 3 and 4 show the soft-start circuitry and
waveform timing.
November 2009
12
M9999-111209-B
相关PDF资料 |
PDF描述 |
|---|---|
| 4590-394K | INDUCTOR HIGH CURRENT 390.0UH |
| 4590-334K | INDUCTOR HIGH CURRENT 330.0UH |
| 4590-274K | INDUCTOR HIGH CURRENT 270.0UH |
| 4590R-184K | INDUCTOR HIGH CURRENT 180.0UH |
| 4590-184K | INDUCTOR HIGH CURRENT 180.0UH |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2156 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Two-Phase, Single-Output, PWM Synchronous Buck Control IC |
| MIC2156YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2-Phase, Single Output, PWM Synchronous Buck Control IC |
| MIC2156YML TR | 功能描述:DC/DC 开关控制器 Single Output, PWM Sync Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MIC2156YML-TR | 功能描述:Buck Regulator Positive Output Step-Down DC-DC Controller IC 32-MLF? (5x5) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 输出类型:晶体管驱动器 功能:降压 输出配置:正 拓扑:降压 输出数:2 输出阶段:2 电压 - 电源（Vcc/Vdd）:4.5 V ~ 14.5 V 频率 - 开关:300kHz 占空比（最大）:0.8 同步整流器:是 时钟同步:是 串行接口:- 控制特性:限流，使能，电源良好，软启动 工作温度:-40°C ~ 125°C （TJ） 封装/外壳:32-VFQFN 裸露焊盘，32-MLF? 供应商器件封装:32-MLF?（5x5） 标准包装:1 |
| MIC2159 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:SYNCHRONOUS-itty⑩ Step-Down Converter IC |
发布紧急采购，3分钟左右您将得到回复。