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参数资料
| 型号： | MIC2184YM |
| 厂商： | Micrel Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 标准包装： | 48 |
| 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： | 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 ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-2161 MIC2184YM-ND |
MIC2184
Functional Diagram
C DECOUP
C IN
V IN
Micrel, Inc.
VINA
1
OVERCURRENT
VREF
COMPARATOR
1.245V
0.1V
9
CSH
EN/UVLO
7
R SENSE
VDD
10
VDD
BIAS
GAIN
3.7
8
CSL
ON
CURRENT
SENSE
AMP
16
VINP
fs/4
CONTROL
14
OUTP
Q1
L1
SYNC
11
V OUT
FREQ/2
15
OSC
RESET
D1
C OUT
FreqOut
2
÷ 2
SLOPE
COMPENSATION
∑
12
PGND
PWM
COMPARATOR
SS
COMP
3
4
gm = 0.0002 V REF
gain = 20
ERROR
fs/4
100k
AMP
0.3V
6
FB
VREF
13
V REF
FREQUENCY
5
SGND
FOLDBACK
Figure 1. MIC2184 Block Diagram
Functional Characteristics
Controller Overview and Functional Description
The MIC2184 is a BiCMOS, switched mode, synchronous,
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 MIC2184 configured as a
synchronous buck converter. At the beginning of the switch-
ing 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 MIC2184 and com-
bined with an internal ramp for stability. This signal is com-
pared 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.
M9999-042205
8
April 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2184YM TR | 功能描述:DC/DC 开关控制器 SO-16 Low Vin Buck PWM Control IC (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 |
| MIC2184YQS | 功能描述:DC/DC 开关控制器 SO-16 Low Vin Synchronous Buck PWM Control IC (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 |
| MIC2184YQS TR | 功能描述:DC/DC 开关控制器 SO-16 Low Vin Synchronous Buck PWM Control IC (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 |
| MIC2185 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Low Voltage Synchronous Boost PWM Control IC |
| MIC2185_05 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Low Voltage Synchronous Boost PWM Control IC |
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