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MIC2199BML Arkusz danych(PDF) 6 Page - Micrel Semiconductor

Numer części MIC2199BML
Szczegółowy opis  300kHz 4mm 횞 4mm Synchronous Buck Converter
PDF  15 Pages
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Producent  MICREL [Micrel Semiconductor]
Strona internetowa  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2199BML Arkusz danych(HTML) 6 Page - Micrel Semiconductor

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MIC2199
Micrel
MIC2199
6
November 2004
Block Diagram
Gm = 0.2×10
-3
Current
Limit
Error
Amp
VIN
VDD
CORRECTIVE
RAMP
RESET
Reference
Oscillator
EN/UVLO
2
7
10
6
12
11
8
9
4
5
3
1
COMP
100k
MIC2199
FB
R2
R1
VOUT
CSH
VDD
BST
CIN
VIN
HSD
Q2
Q1
D1
D2
CBST
COUT
VIN
VOUT
L1
VSW
LSD
PGND
CCOMP
RCOMP
4.7µF
AV = 2
V
0.8V
R1
R2
OUT =+
1
V6 V
OUT(max) =
.0
Current
Sense
Amp
RCS
Control
Logic
⎞
⎠
⎛
⎝
PWM
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 con-
verter 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 con-
figurations.
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 compensa-
tion.
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.



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