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參數(shù)資料
| 型號： | MIC2193BM |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 400KHZ SO 8 SYNCHRONOUS BUCK CONTROL IC |
| 中文描述： | SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 63K |
| 代理商： | MIC2193BM |
MIC2193
Functional Diagram
Micrel
M9999-042704
6
April 2004
Functional Characteristics
Controller Overview and Functional Description
The MIC2193 is a BiCMOS, switched mode, synchronous
step down (buck) converter controller. It uses both N- and P-
channel MOSFETs, which allows the controller to operate at
100% duty cycle and eliminates the need for a high-side drive
boot-strap circuit. Current mode control is used to achieve
superior transient line and load regulation. An internal correc-
tive 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 MIC2193 configured as a
synchronous buck converter. At the beginning of the switch-
FREQUENCY
FOLDBACK
ERROR
AMP
PWM
COMPARATOR
OVERCURRENT
COMPARATOR
L1
CURRENT
SENSE
AMP
0.3V
100k
V
REF
gm = 0.0002
gain = 20
fs/4
COMP
ON
G3
RESET
VREF
2
VDD
COMSLOPE
∑
OSC
fs/4
CONTROL
BIAS
VDD
5
CSL
4
VIN
OUTP
8
OUTN
7
Q2
Q1
D1
FB
3
VIN
C
DECOUP
1
C
IN
GND
6
C
OUT
V
OUT
R
SENSE
V
IN
Figure 1. MIC2193 Block Diagram
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 MIC2193 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,
until the synchronous, N-channel MOSFET turns on. The
voltage drop across the MOSFET is less than the forward
voltage drop of the diode, which improves the converter
efficiency. At the end of the switching period, the synchro-
nous MOSFET is turned off and the switching cycle repeats.
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相關(guān)代理商/技術(shù)參數(shù) |
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| MIC2193BM TR | 功能描述:IC REG CTRLR BUCK 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) |
| MIC2193PM | 制造商:Micrel Inc 功能描述: |
| MIC2193YM | 功能描述:DC/DC 開關(guān)控制器 SO-8 3V Synchronous 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 |
| MIC2193YM TR | 功能描述:DC/DC 開關(guān)控制器 SO-8 3V Synchronous 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 |
| MIC2193YM-TR | 功能描述:Buck Regulator Positive Output Step-Down DC-DC Controller IC 8-SOIC 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 輸出類型:晶體管驅(qū)動(dòng)器 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出數(shù):1 輸出階段:1 電壓 - 電源（Vcc/Vdd）:2.9 V ~ 14 V 頻率 - 開關(guān):400kHz 占空比（最大）:1 同步整流器:是 時(shí)鐘同步:無 串行接口:- 控制特性:- 工作溫度:-40°C ~ 125°C （TJ） 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商器件封裝:8-SOIC 標(biāo)準(zhǔn)包裝:1 |
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