参数资料
型号: MIC3838YMM TR
厂商: Micrel Inc
文件页数: 8/11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:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
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
Functional Diagram
Figure 1. MIC3838 Block Diagram
Micrel
V IN = 36V to 75V
MIC3838
150k
50k
V COMP
PWM
Comparator
13k
4.5k
330pF
0.5V
Peak Current
Comparator
330pF
V MAX at Ramp Input = 1.5V
V MAX at I LIM Input = 0.5V
0.75V
Over Current
Comparator
Oscillator
Figure 2. Volt Second Clamp and Voltage Feed Forward Circuit
Functional Description
The MIC3838/9 is a high-speed power supply controller with
push-pull output drive capability. MIC3838 has a higher V DD
turn-on threshold and more hysteresis between V DD turn-on
and turn-off than the MIC3839. The outputs of the controller
operate in a push-pull fashion with a guaranteed dead time
between them. A block diagram of the MIC3838/9 controller
is shown in Figure 1.
V DD and Turn-on Sequence
The oscillator and output gate drive signals are disabled
when V DD is lower than the turn on threshold. Circuitry in the
output drivers eliminates glitching or random pulsing during
the start-up sequence. The oscillator is enabled when V DD is
applied and reaches the turn-on threshold. The V DD com-
parator also turns off the internal soft-start discharge FET,
slowly bringing up the COMP pin voltage.
The V DD pin is internally clamped. As V DD approaches this
clamp voltage, the V DD current will increase over the normal
current draw of the IC. IDD currents greater than 20mA may
cause excessive power dissipation in the MIC3838/9.
MIC3838/3839
8
April 2005
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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