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参数资料
| 型号： | MIC3838YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 1/11页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM 10-MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 50% |
| 电源电压： | 2 V ~ 14 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： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC3838YMMTR MIC3838YMMTR-ND |
MIC3838/3839
General Description
MIC3838/3839
Flexible Push-Pull PWM Controller
Features
Micrel
The MIC3838 and MIC3839 are a family of complementary
output push-pull PWM control ICs that feature high speed and
low power consumption. The MIC3838/9 are ideal for telecom
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
Configurable for current-mode or voltage-mode control
Easily implements volt-second clamp
Leading edge current-sense blanking
3V reference output available
130 μ A typical start-up current
The MIC3838/9 are designed for high flexibility with minimum
pin-count. The devices are easily configurable for either
voltage-mode or current-mode control. Additionally, the
MIC3838/9 can easily implement a volt-second clamp that
automatically limits the duty cycle during input transients,
allowing designers to use the smallest possible transformers
and power components. A 3V reference output is also avail-
able that eliminates the need for an external reference.
The dual-ended push-pull architecture of the MIC3838/9
allows more efficient utilization of the transformer than single-
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, limiting the duty cycle of each output stage to less than
50%.
The MIC3838 has a turn-on threshold of 12.5V whereas the
MIC3839 has a lower turn-on threshold of 4.3V. Both devices
are available in a small size MSOP-10 package with an
operating range of –40 ° C to +85 ° C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Typical Application
V IN
36V to 75V
? 1mA typical run current
? Operation to 1MHz
? On-chip error amplifier with 4MHz gain bandwidth
product
? Internal soft start
? On-chip V DD 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
? Push-pull converters
? Voltage-fed push-pull converters
? Telecom equipment and power supplies
? Industrial power supplies
? 42V automotive power supplies
? Base stations
? Networking power supplies
V OUT
12V 100W
Start-Up
Circuitry
MIC3838x-x
VREF
RC
GND
VDD
OUTA
OUTB
COMP
FB
RAMP
ILIM
Feed Forward
Ramp/
Volt Sec Clamp
Reference
& Isolation
Voltage-Mode Half-Bridge Converter CIrcuit
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
1
MIC3838/3839
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC3839 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Flexible Push-Pull PWM Controller |
| MIC3839BMM | 功能描述:IC REG CTRLR ISO PWM 10-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MIC3839BMM TR | 功能描述:IC REG CTRLR ISO PWM 10-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MIC3839YMM | 功能描述:DC/DC 开关控制器 Push-Pull DC/DC Controller (Lead Free) 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 |
| MIC3839YMM TR | 功能描述:DC/DC 开关控制器 Push-Pull DC/DC Controller (Lead Free) 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 |
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