ML4818
V
CC
120
100
80
GAIN
60
40
45
20
0
0
100
1k
10k
100k
FREQUENCY
1M
0
10M
GAIN
PHASE
90
135
PHASE (Degrees)
Q2
180
V
CC
OUT
Q1
POWER
GND
Figure 6. Error Amplifier Open-Loop Gain and
Phase vs. Frequency.
7
6
SATURATION DROP (V)
Figure 7. Power Driver Simplified Schematic.
5
4
3
2
SINK
1
0
OUTPUT VOLTAGE (V)
15
10
10nF
10nF
1nF
SOURCE
5
1nF
100
t
F
200
(ns)
~
~
100
200
t
R
0
0.2
0.4
0.6
0.8
1.0
1.2
OUTPUT CURRENT (A)
1.4
Figure 8. Output Drive Saturation Voltage vs.
Output Current.
Figure 9. Output Rise/Fall Time.
OUTPUT DRIVER STAGE
The ML4818 has four high current high speed totem pole
output drivers each capable of 1.5A peak output, designed
to quickly switch the gates of capacitive loads, such as
power MOSFET transistors. Figure 8 illustrates the
saturation characteristics of the ouput drive transistors
shown in Figure 7. Typical rise and fall time characteristics
of the output drivers are illustrated with capacitive loads
of 1nF and 10nF in Figure 9.
7
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
