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參數(shù)資料
| 型號： | MIC2185 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Low Voltage Synchronous Boost PWM Control IC |
| 中文描述： | 低電壓同步升壓PWM控制IC |
| 文件頁數(shù)： | 8/15頁 |
| 文件大小： | 141K |
| 代理商： | MIC2185 |
MIC2185
Micrel
MIC2185
8
May 2002
MOSFET, Q2. Current flows through the MOSFET because
its voltage drop is less than diode D1. The MOSFET remains
on until the end of the switching cycle. There is another non-
overlap time delay between the turn-off of the high side
MOSFET and the turn-on of the low side MOSFET at the
beginning of the next switching cycle.
The description of the MIC2185 controller is broken down into
6 basic functions.
Control Loop
PWM Operation
SKIP Mode Operation
Current Limit
MOSFET gate drive
Reference, Enable & UVLO
Oscillator & Sync
Soft Start
Control Loop
PWM and SKIP modes of operation
The MIC2185 can operate in either PWM (pulse width modu-
lated) or skip mode. The efficiency of the boost converter can
be improved at lower output loads by manually selecting the
skip mode of operation. The potential disadvantage of skip
mode is the variable switching frequency that accompanies
this mode of operation. The occurrence of switching pulses
depends on component values as well as line and load
conditions. PWM mode is the best choice of operation at
higher output loads. In skip mode, current through the induc-
tor can settle to zero, causing voltage ringing across the
inductor. PWM mode has the advantages of lower output
ripple voltage and higher efficiencies at higher output loads.
Another advantage of the synchronous PWM mode of opera-
tion is that the inductor current is always continuous, even at
Osc
P
GND
Q2
D1
Q1
L1
V
IN
Control
Bias
V
REF
V
DD
S
GND
Skip Current
Limit Comparator
Hysteresis
Comparator
±
1%
F
F
Current Reset
On
PGND
12
CSH
9
OUTN
13
OUTP
14
V
IN
P
16
V
IN
A
1
FB
6
5
SGND
VDD
10
VREF
8
COMP
4
SS
3
SYNC
11
FREQ/2
15
SKIP
2
EN/UVLO
7
V
DD
P
GND
50mV
V
1.245V
R2
R1
R
SENSE
C
OUT
V
OUT
P
GND
V
REF
V
DD
C
DECOUP
C
IN
Figure 2. MIC2185 Skip Mode Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2185BM | Low Voltage Synchronous Boost PWM Control IC |
| MIC2185BQS | Low Voltage Synchronous Boost PWM Control IC |
| MIC2193 | 400KHZ SO 8 SYNCHRONOUS BUCK CONTROL IC |
| MIC2193BM | 400KHZ SO 8 SYNCHRONOUS BUCK CONTROL IC |
| MIC2193YM | 400KHZ SO 8 SYNCHRONOUS BUCK CONTROL IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2185_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Low Voltage Synchronous Boost PWM Control IC |
| MIC2185BM | 功能描述:IC REG CTRLR BST 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) |
| MIC2185BM TR | 功能描述:IC REG CTRLR BST 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) |
| MIC2185BQS | 功能描述:IC REG CTRLR BST 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) |
| MIC2185BQS TR | 功能描述:IC REG CTRLR BST 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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