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參數資料
| 型號： | MIC3839 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Flexible Push-Pull PWM Controller |
| 中文描述： | 靈活的推挽式PWM控制器 |
| 文件頁數： | 1/11頁 |
| 文件大小： | 341K |
| 代理商： | MIC3839 |
August 2003
1
MIC3838/3839
MIC3838/3839
Micrel
MIC3838/3839
Flexible Push-Pull PWM Controller
General Description
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
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
Features
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
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
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
MIC3838x-x
V
OUT
12V 100W
VREF
RC
VDD
OUTA
COMP
GND
OUTB
RAMP
FB
ILIM
Start-Up
Circuitry
D
Reference
& Isolation
Feed Forward
Ramp/
Volt Sec Clamp
V
IN
36V to 75V
Voltage-Mode Half-Bridge Converter CIrcuit
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| MIC3839BMM | Flexible Push-Pull PWM Controller |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MIC3839BMM | 功能描述:IC REG CTRLR ISO PWM 10-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| MIC3839BMM TR | 功能描述:IC REG CTRLR ISO PWM 10-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| MIC3839YMM | 功能描述:DC/DC 開關控制器 Push-Pull DC/DC Controller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| MIC3839YMM TR | 功能描述:DC/DC 開關控制器 Push-Pull DC/DC Controller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| MIC384 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Three-Zone Thermal Supervisor Advance Information |
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