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参数资料
| 型号： | MIC2198YML |
| 厂商： | Micrel Inc |
| 文件页数： | 5/14页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 12-MLF |
| 标准包装： | 300 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 76% |
| 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 ~ 125°C |
| 封装/外壳： | 12-VFDFN 裸露焊盘，12-MLF? |
| 包装： | 托盘 |
MIC2198
Block Diagram
V IN
C IN
Micrel, Inc.
EN/UVLO
V DD
VDD
2
Reference
V IN
7
VIN
6
BST
D2
4.7μF
10
Control
Logic
HSD
12
VSW
Q2
C BST
L1
R CS
V OUT
11
LSD
8
PGND
Q1
D1
C OUT
9
Current
Limit
PWM
Current
Sense
Amp
CSH
4
RESET
CORRECTIVE
RAMP
A V = 2
VOUT
5
C COMP
COMP
1
R COMP
Oscillator
Error
Amp
100k
G m = 0.2×10 -3
FB
3
? R1?
V OUT = 0.8V ? 1 + R2 ?
V OUT(max) = 6 .0 V
R1
R2
MIC2198
Figure 1. Internal Block Diagram
Functional Description
The MIC2198 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-ef?ciency, high-performance DC-DC
converter applications.
The MIC2198 block diagram is shown above.
The MIC2198 controller is divided into 5 functions.
? Control loop
? Current limit
? Reference, enable and UVLO
? MOSFET gate drive
? Oscillator
Control Loop
The MIC2198 operates in PWM (pulse-width-modulation)
mode. In PWM mode, the synchronous buck converter
forces continuous current to ?ow in the inductor which also
improves cross regulation of transformer coupled, multiple
output con?gurations.
PWM Control Loop
The MIC2198 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 simpli?es compensation.
A block diagram of the MIC2198 PWM current-mode control
loop is shown in Figure 2 and the PWM mode voltage and
current waveform is shown in Figure 3. The inductor current
is sensed by measuring the voltage across the resistor, R CS .
October 2005
5
MIC2198
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2198YML TR | 功能描述:DC/DC 开关控制器 500KHz 12 Lead Sync Buck Controller (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 |
| MIC2198YMLTR | 制造商:Micrel 功能描述:DC-DC Controller Sync Buck 4.5V to 32V |
| MIC2198YML-TR | 功能描述:Buck Regulator Positive Output Step-Down DC-DC Controller IC 12-MLF? (4x4) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 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:500kHz 占空比（最大）:0.76 同步整流器:是 时钟同步:无 串行接口:- 控制特性:使能 工作温度:-40°C ~ 125°C （TJ） 封装/外壳:12-VFDFN 裸焊盘，12-MLF? 供应商器件封装:12-MLF?（4x4） 标准包装:1 |
| MIC2199 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:300kHz 4mm 】 4mm Synchronous Buck Converter |
| MIC2199_10 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:300kHz 4mm × 4mm Synchronous Buck Converter |
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