ML4823

6

REV. 1.0 10/12/2000

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.

5

4

3

2

1

0

0.2

0.4

0.6

0.8

1.0

TIME (

µs)

100

80

60

40

20

0

–20

100

1K

10K 100K

1M

10M

FREQ (Hz)

100M

0

0

–90

–180

GAIN

φ

Figure 5. Unity Gain Slew Rate

Figure 6. Open Loop Frequency Response

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.

Figure 8. Saturation Curves

3

2

1

0

0

0.5

1.0

1.5

SOURCE

SINK

Figure 7. Simplified Schematic

POWER

GND

Q1

Q2

OUT

POWER

15

10

5

0

0

40

80

120

160

200

TIME (ns)

0.2

0

–0.2

15

10

5

0

0

100

200

300

400

500

TIME (ns)

2

0

–2