参数资料
| 型号： | MIC2182YSM |
| 厂商： | Micrel Inc |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SSOP |
| 标准包装： | 77 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 86% |
| 电源电压： | 4.5 V ~ 32 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 ~ 85°C |
| 封装/外壳： | 16-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-1069 |
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MIC2182
Functional Description
See “ Applications Information ” following this section for com-
ponent selection information and Figure 14 and Tables 1
through 5 for predesigned circuits.
The MIC2182 is a BiCMOS, switched-mode, synchronous
step-down (buck) converter controller. 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 con-
verter applications.
The MIC2182 block diagrams are shown in Figure 2a and
Figure 2b.
The MIC2182 controller is divided into 6 functions.
? Control loop
- PWM operation
- Skip-mode operation
? Current limit
Micrel
Control Loop
PWM and Skip Modes of Operation
The MIC2182 operates in PWM (pulse-width-modulation)
mode at heavier output load conditions. At lighter load condi-
tions, the controller can be configured to automatically switch
to a pulse-skipping mode to improve efficiency. The potential
disadvantage of skip mode is the variable switching fre-
quency that accompanies this mode of operation. The occur-
rence of switching pulses depends on component values as
well as line and load conditions. There is an external sync
function that is disabled in skip mode. In PWM mode, the
synchronous buck converter forces continuous current to
flow in the inductor. In skip mode, current through the inductor
can settle to zero, causing voltage ringing across the induc-
tor. Pulling the PWM pin (pin 2) low will force the controller to
operate in PWM mode for all load conditions, which will
improve cross regulation of transformer-coupled, multiple
output configurations.
PWM Control Loop
?
?
?
?
Reference, enable, and UVLO
MOSFET gate drive
Oscillator and sync
Soft start
V DD
The MIC2182 uses current-mode control to regulate the
output voltage. This method senses the output voltage (outer
loop) and the inductor current (inner loop). It uses inductor
current and output voltage to determine the duty cycle of the
buck converter. Sampling the inductor current removes the
inductor from the control loop, which simplifies compensa-
tion.
V IN
C IN
VDD
Reference V IN
11
VIN
D2
4.7 μ F
10
VBST
CONTROL LOGIC AND
14
PULSE-WIDTH MODULATOR
HSD
16
VSW
Q2
C BST
L1
R CS
V OUT
15
LSD
13
Q1
D1
C OUT
PWM Mode
Q
to Skip
Mode
PGND
12
R
S
LOW
FORCES
SKIP MODE
0.024V
Current
PWM
COMPARATOR
Sense
Amp
CSH
8
VOUT
RESET
CORRECTIVE
RAMP
A V = 2
9
R1
Oscillator
Error
Amp
FB
V OUT = 1.245V ? 1 +
?
COMP
3
C COMP
R COMP
100k
G m = 0.2 × 10 -3
7
?
?
R1 ?
R2 ?
R2
MIC2182 [adj.] PWM Mode
Figure 3. PWM Operation
M9999-042204
10
April 22, 2004
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2182YSM TR | 功能描述:DC/DC 开关控制器 High EfficiencySynchronous Buck Controller SSOP Pkg (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 |
| MIC2182YSM-TR | 功能描述:Buck Regulator Positive Output Step-Down DC-DC Controller IC 16-SSOP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 输出类型:晶体管驱动器 功能:降压 输出配置:正 拓扑:降压 输出数:1 输出阶段:1 电压 - 电源（Vcc/Vdd）:4.5 V ~ 32 V 频率 - 开关:300kHz 占空比（最大）:0.86 同步整流器:是 时钟同步:是 串行接口:- 控制特性:使能，软启动 工作温度:-40°C ~ 85°C（TA） 封装/外壳:16-SSOP（0.209"，5.30mm 宽） 供应商器件封装:16-SSOP 标准包装:1 |
| MIC2183 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Low Voltage Synchronous Buck PWM Control IC Final Information |
| MIC2183_05 | 制造商:MICREL 制造商全称: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 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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