ML4825CS View Datasheet(PDF) - Micro Linear Corporation
Part Name
Description
Manufacturer
ML4825CS Datasheet PDF : 9 Pages
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ML4825
ERROR AMPLIFIER
The ML4825 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 ML4825 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.
SOFT START AND CURRENT LIMIT
The ML4825 employs two current limits. When the
voltage at ILIM/SD exceeds 1V, the outputs are
immediately shut off and the cycle is terminated for the
remainder of the oscillator period by resetting the RS flip
flop.
If the output current is rising quickly such that the voltage
on ILIM/SD reaches 1.4V before the outputs have turned
off, a soft start cycle is initiated. The soft start capacitor is
discharged and outputs are held “off” until the voltage at
SS reaches 1V, ensuring a complete soft start cycle. The
duty cycle on start up is limited by limiting the output
voltage of the error amplifier voltage to the voltage at SS.
5
4
VIN
3
VOUT
2
1
0
0.2
0.4
0.6
0.8
1.0
TIME (µs)
Figure 5. Unity Gain Slew Rate
VCC
POWER VC
13
Q2
OUT A
11
OUT B
14
Q1
POWER
GND 12
Figure 7. Simplified Schematic
100
80
60
AV
40
20
0
0
0
0
–20
–90
–180
100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 6. Open Loop Frequency Response
3
2
SOURCE
1
SINK
0
0
0.5
1.0
1.5
IOUT (A)
Figure 8. Saturation Curves
6
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