MIC4742 Datasheet, PDF (15/23 Pages) Micrel Semiconductor – 2 MHz Dual 2A Integrated Switch Buck Regulator

Micrel, Inc.
0
-5
-10
-15
-20
100
Gain and Phase
vs. Frequency
35
30
25
20
15
10
5
1000
10000
100000
FREQUENCY (Hz)
0
1000000
The graph above shows the effects on the gain and
phase of the system caused by feedback resistors and a
feedforward capacitor. The maximum amount of phase
boost achievable with a feedforward capacitor is
graphed below.
MIC4742
Max. Amount of Phase Boost
Obtainable Using Cff vs. Output
Voltage
60
50
40
30
20
10
0
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
By looking at the graph, phase margin can be affected to
a greater degree with higher output voltages.
March 2009
15
M9999-030209-D