Datasheet > MIC3808BM

MIC3808BM

更新时间： 2024-11-28 10:57:07

品牌	Logo	应用领域
MIC		开关光电二极管信息通信管理控制器
页数	文件大小	规格书
11页	146K
描述
Push-Pull PWM Controller

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MIC3808BM 数据手册

MIC3808/3809

Micrel

MIC3808/3809

Push-Pull PWM Controller

General Description

Features

The MIC3808 and MIC3809 are a family of complementary

outputpush-pullPWMcontrolICsthatfeaturehighspeedand

lowpowerconsumption.TheMIC3808/9areidealfortelecom

level (36V to 75V) isolated step down dc/dc conversion

applications where high output current, small size, and high

efficiency are required.

• Dual output drive stages in push-pull configuration

• Leading edge current-sense blanking

• 130µA typical start-up current

• 1mA typical run current

• Operation to 1MHz

• Internal soft start

• On-chip error amplifier with 4MHz gain bandwidth

product

The dual-ended push-pull architecture of the MIC3808/9

allowsmoreefficientutilizationofthetransformerthansingle-

ended topologies, allowing smaller size dc/dc solutions.

Additionally, the out-of-phase push-pull topology allows a

higher effective duty cycle, reducing input and output ripple

as well as stress on the external components. The dead-time

between the two outputs is adjustable between 60ns to

200ns,limitingthedutycycleofeachoutputstagetolessthan

50%.

• On-chip V clamping

• Output drive stages capable of 500mA peak source

current, 1A peak sink current

Applications

• High efficiency “brick” power supply modules

• Half bridge converters

• Full bridge converters

TheMIC3808/9arebuiltonalow-power,high-speedBiCMOS

process. The 130µA start-up current and 1mA run-current

reduce the size of the start-up circuitry and allow high

efficiency even at light loads. The high-speed internal 4MHz

error amplifier allows MIC3808/9 operation up to 1MHz.

• Push-pull converters

• Voltage-fed push-pull converters

• Telecom equipment and power supplies

• Networking power supplies

• Industrial power supplies

The MIC3808 has a turn-on threshold of 12.5V whereas the

MIC3809 has a lower turn-on threshold of 4.3V. Both devices

are available in SOP-8 and MSOP-8 package options with an

operating range of –40°C to +85°C.

• 42V automotive power supplies

• Base stations

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Typical Application

V_OUT

12V 100W

V_IN

36V to 75V

Start-Up

Circuitry

MIC3808

VDD

GND OUTA

COMP OUTB

Slope

Comp

Reference

& Isolation

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

April 2005

MIC3808/3809

12 3 4 5 6 7...11

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与MIC3808BM相关器件

型号	品牌	获取价格	描述	数据表
MIC3808BMM	MIC	获取价格	Push-Pull PWM Controller
MIC3808BMM	MICROCHIP	获取价格	Switching Controller, Current-mode, 1A, 1000kHz Switching Freq-Max, BICMOS, PDSO8, MSOP-8
MIC3808BMMTR	MICREL	获取价格	暂无描述
MIC3808YM	MICROCHIP	获取价格	1A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO8
MIC3808YMM	ROCHESTER	获取价格	1A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO8, LEAD FREE, MSOP-8
MIC3808YMM-TR	MICROCHIP	获取价格	1A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO8
MIC3808YM-TR	MICROCHIP	获取价格	1A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO8
MIC3809	MICREL	获取价格	Push-Pull PWM Controller
MIC3809	MIC	获取价格	Push-Pull PWM Controller
MIC3809	MICROCHIP	获取价格	The MIC3808 and MIC3809 are a family of complementary output push-pull PWM control ICs tha

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