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参数资料
| 型号： | MIC2194BM |
| 厂商： | Micrel Inc |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 8-SOIC |
| 标准包装： | 95 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 100% |
| 电源电压： | 2.9 V ~ 14 V |
| 降压： | 是 |
| 升压： | 是 |
| 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 ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
MIC2194
Functional Diagram
C DECOUP
C IN
V IN
Micrel
VIN
8
OVERCURRENT
VREF
1.245V
COMPARATOR
0.1V
Threshold
9
CSH
EN/UVLO
3
R SENSE
VDD
5
VDD
BIAS
GAIN
3
4
CSL
CURRENT
ON
SENSE
AMP
VIN
fs/4
CONTROL
7
OUTP
Q1
L1
V OUT
OSC
RESET
D1
C OUT
SLOPE
COMPENSATION
∑
PWM
COMPARATOR
gm = 0.0002 V REF
gain = 20
COMP
1
ERROR
fs/4
100k
FREQUENCY
AMP
0.3V
2
6
FB
GND
FOLDBACK
Figure 1. MIC2194 Block Diagram
Functional Characteristics
Controller Overview and Functional Description
The MIC2194 is a BiCMOS, switched-mode, step down
(buck) converter controller. It uses a P-channel MOSFET,
which allows the controller to operate at 100% duty cycle and
eliminates the need for a high side drive bootstrap circuit.
Current mode control is used to achieve superior transient
line and load regulation. An internal corrective ramp provides
slope compensation for stable operation above a 50% duty
cycle. The controller is optimized for high efficiency, high
performance DC-DC converter applications.
Figure 1 is a block diagram of the MIC2194 configured as a
buck converter. At the beginning of the switching cycle, the
OUTP pin pulls low and turns on the high-side P-channel
MOSFET, Q1. Current flows from the input to the output
through the current sense resistor, MOSFET and inductor.
The current amplitude increases, controlled by the inductor.
The voltage developed across the current sense resistor,
R SENSE , is amplified inside the MIC2194 and combined with
an internal ramp for stability. This signal is compared to the
output of the error amplifier. When the current signal equals
the error voltage signal, the P-channel MOSFET is turned off.
The inductor current flows through the diode, D1. At the
beginning of the next switching cycle, the P-channel MOSFET
is turned on which turns off the diode, D1.
MIC2194
6
April 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2194BM TR | 功能描述:IC REG CTRLR BST PWM CM 8-SOIC 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) |
| MIC2194YM | 功能描述:DC/DC 开关控制器 SO-8 3V Buck Contoller (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 |
| MIC2194YM TR | 功能描述:DC/DC 开关控制器 SO-8 3V Buck Contoller (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 |
| MIC2196 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:400kHz SO-8 Boost Control IC |
| MIC2196_08 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:400kHz SO-8 Boost Control IC |
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