参数资料
型号: MIC2199YML TR
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: 1
PWM 型: 电流模式
输出数: 1
频率 - 最大: 330kHz
占空比: 85%
电源电压: 4.5 V ~ 32 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 12-VFDFN 裸露焊盘,12-MLF?
包装: 标准包装
产品目录页面: 1092 (CN2011-ZH PDF)
其它名称: 576-1718-6
Micrel, Inc.
Block Diagram
V IN
C IN
MIC2199.
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
? R2 ?
V OUT = 0.8V ? 1 + R1 ?
V OUT(max) = 6 .0 V
R1
R2
MIC2199
Figure 1. Internal Block Diagram
Functional Description
The MIC2199 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 
converter applications.
The MIC2199 block diagram is shown above.
The MIC2199 controller is divided into 5 functions.
?  Control loop
?  Current limit
?  Reference, enable and UVLO
?  MOSFET gate drive
?  Oscillator
Control Loop
The MIC2199 operates in PWM (pulse-width-modulation)
mode. In PWM mode, the synchronous buck converter
forces continuous current to flow in the inductor which also 
improves cross regulation of transformer coupled, multiple
output configurations.
PWM Control Loop
The MIC2199 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 compensation.
A block diagram of the MIC2199 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 .
January 2010
5
M9999-011310
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