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參數(shù)資料
| 型號： | MIC2183 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Low Voltage Synchronous Buck PWM Control IC Final Information |
| 中文描述： | 低電壓同步降壓PWM控制IC決賽信息 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 98K |
| 代理商： | MIC2183 |
MIC2183
Functional Diagram
Micrel
MIC2183
8
December 10, 2001
Functional Characteristics
Controller Overview and Functional Description
The MIC2183 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
bootstrap 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 MIC2183 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
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
SS
FreqOut
FREQ/2
SYNC
ON
3.7
PGND
RESET
VREF
4
3
2
15
11
VDD
COMSLOPE
∑
OSC
fs/4
CONTROL
BIAS
÷
2
VDD
10
EN/UVLO
7
CSH
9
CSL
8
VINP
16
OUTP
14
OUTN
13
PGND
Q2
Q1
D1
12
FB
6
VINA
0.1V
C
DECOUP
1
C
IN
SGND
5
C
OUT
V
OUT
R
SENSE
V
IN
Figure 1. MIC2183 Block Diagram
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 MIC2183 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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2183_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Low Voltage Synchronous Buck PWM Control IC |
| MIC2183BM | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| MIC2183BM TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| MIC2183BQS | 功能描述:IC REG CTRLR BUCK PWM CM 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| MIC2183BQS TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
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