参数资料
型号: MIC3839YMM 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: MIC3839YMMTR
MIC3839YMMTR-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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MIC384-0BM TR 功能描述:IC SUPERVSR THERM LOC/REM 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统(传感器) 传感器类型:内部和外部 感应温度:-40°C ~ 125°C,外部传感器 精确度:±2.5°C 本地(最大值),±5°C 远程(最大值) 拓扑:ADC,比较器,寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6
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