參數(shù)資料
型號: MIC2186BM
廠商: MICREL INC
元件分類: 穩(wěn)壓器
英文描述: Low Voltage PWM Control IC
中文描述: SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO16
封裝: SOP-16
文件頁數(shù): 8/16頁
文件大?。?/td> 162K
代理商: MIC2186BM
MIC2186
Micrel
MIC2186
8
July 2002
Control Loop
PWM and SKIP modes of operation
The MIC2186 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 accompa-
nies 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. PWM mode has the advantages of lower
output ripple voltage and higher efficiencies at higher output
loads. Pulling the SKIP pin (pin 3) low will force the controller
to operate in PWM mode for all load conditions. Pulling the
SKIP pin high will force the controller to operate in SKIP
mode.
The description of the MIC2186 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
Osc
P
GND
D1
Q1
L1
V
IN
Control
Bias
V
REF
V
DD
S
GND
Skip Current
Limit Comparator
Hysteresis
Comparator
±
1%
F
F
Reset
On
P
GND
12
CSH
9
OutN
14
V
IN
P
16
V
IN
A
1
V
fb
6
5
S
GND
V
DD
10
V
REF
8
COMP
4
Soft Start
3
HiDC
13
Sync
11
Freq/2
15
SKIP
2
EN/UVLO
7
50mV
V
DD
V
1.245V
R2
R1
R
SENSE
C
OUT
V
OUT
P
GND
V
REF
C
DECOUP
C
IN
V
DD
Figure 2. MIC2186 SKIP Mode Block Diagram
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