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參數(shù)資料
| 型號： | MIC2194 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | SFP Management IC |
| 中文描述： | SFP管理IC |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 63K |
| 代理商： | MIC2194 |
MIC2194
Functional Diagram
Micrel
MIC2194
6
October 2002
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.
FREQUENCY
FOLDBACK
ERROR
AMP
PWM
COMPARATOR
OVERCURRENT
COMPARATOR
0.1V
Threshold
L1
CURRENT
SENSE
AMP
0.3V
100k
V
REF
gm = 0.0002
gain = 20
fs/4
COMP
ON
G3
RESET
VREF
1
VDD
COMSLOPE
∑
OSC
fs/4
CONTROL
BIAS
VDD
5
EN/UVLO
3
CSH
9
CSL
4
VIN
OUTP
7
Q1
D1
FB
2
VIN
C
DECOUP
8
C
IN
GND
6
C
OUT
V
OUT
R
SENSE
V
IN
Figure 1. MIC2194 Block Diagram
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PDF描述 |
|---|---|
| MIC2194BM | 400kHz SO-8 Buck Control IC |
| MIC3000 | SFP Management IC |
| MIC3000BML | SFP Management IC |
| MIC2199 | 300kHz 4mm 】 4mm Synchronous Buck Converter |
| MIC2199BML | 300kHz 4mm 】 4mm Synchronous Buck Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2194_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:400kHz SO-8 Buck Control IC |
| MIC2194BM | 功能描述:IC REG CTRLR BST PWM CM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):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) |
| MIC2194BM TR | 功能描述:IC REG CTRLR BST PWM CM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):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) |
| MIC2194YM | 功能描述:DC/DC 開關(guān)控制器 SO-8 3V Buck Contoller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MIC2194YM TR | 功能描述:DC/DC 開關(guān)控制器 SO-8 3V Buck Contoller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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