参数资料
型号: MIC2198BML TR
厂商: Micrel Inc
文件页数: 6/14页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 12-MLF
标准包装: 5,000
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:
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: 带卷 (TR)
其它名称: MIC2198BMLTR
MIC2198BMLTR-ND
MIC2198
A ramp is added to the ampli?ed current-sense signal to
provide slope compensation, which is required to prevent
unstable operation at duty cycles greater than 50%.
A transconductance ampli?er is used for the error ampli?er,
which compares an attenuated sample of the output voltage
with a reference voltage. The output of the error ampli?er is
Micrel, Inc.
the COMP (compensation) pin, which is compared to the
current-sense waveform in the PWM block. When the current
signal becomes greater than the error signal, the comparator
turns off the high-side drive. The COMP pin (pin 1) provides
access to the output of the error ampli?er and allows the use
of external components to stabilize the voltage loop.
V IN
C IN
V DD
VDD
Reference V IN
7
VIN
6
D2
4.7μF
BST
CONTROL LOGIC AND
PULSE-WIDTH MODULATOR
10
HSD
C BST
12
VSW
Q2
L1
R CS
V OUT
11
R
Q
S
LSD
8
PGND
Q1
D1
C OUT
PWM
COMPARATOR
Current
Sense
Amp
9
CSH
4
VOUT
RESET
CORRECTIVE
RAMP
A V = 2
5
C COMP
? 1 + R2 ?
COMP
1
R COMP
Oscillator
Error
Amp
100k
G m = 0.2×10 -3
FB
3
V OUT = 0.8V
? R1 ?
R1
R2
MIC2198
Figure 2. PWM Operation
V IN
V SW
0V
I L1
Reset
Pulse
I LOAD
0A
V DD
0V
V IN + V DD
V HSD
0V
V LSD
V DD
0V
Figure 3. PWM-Mode Timing
MIC2198
6
October 2005
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