ml4823 Fairchild Semiconductor, ml4823 Datasheet - Page 6

• Manufacturer Part Number: ml4823
• Description: High Frequency Power Supply Controller
• Manufacturer: Fairchild Semiconductor

ML4823
ERROR AMPLIFIER
The ML4823 error amplifier is a 5.5MHz bandwidth 12V/µs
slew rate op-amp with provision for limiting the positive
output voltage swing (Output Inhibit line) for ease in
implementing the soft start function.
OUTPUT DRIVER STAGE
The ML4823 Output Driver is a 2A peak output high speed
totem pole circuit designed to quickly switch the gates of
capacitive loads, such as power MOSFET transistors.
6
3
2
1
0
0
5
4
3
2
1
0
V
Figure 5. Unity Gain Slew Rate
Figure 7. Simplified Schematic
IN
Figure 8. Saturation Curves
SOURCE
SINK
0.2
V
OUT
0.5
V
CC
0.4
I
TIME ( s)
OUT
(A)
0.6
Q2
Q1
1.0
0.8
POWER
V
OUT
POWER
GND
C
1.0
1.5
Figure 6. Open Loop Frequency Response
15
10
Figure 10 Rise/Fall Time (C
15
10
100
5
0
–20
Figure 9. Rise/Fall Time (C
5
0
80
60
40
20
0
0
0
100
1K
40
100
10K 100K
80
200
GAIN
FREQ (Hz)
TIME (ns)
TIME (ns)
120
300
1M
L
L
= 10,000pF)
= 1000pF)
10M
160
REV. 1.0 10/12/2000
400
100M
200
500
0
0
–90
–180
0.2
I
0
–0.2
L
2
I
0
–2
L
(A)
(A)