7

ML4818

120

100

80

60

40

20

0

180

135

90

45

0

0

100

1k

10k

100k

1M

10M

FREQUENCY

GAIN

PHASE

POWER

GND

Q1

Q2

OUT

Figure 7. Power Driver Simplified Schematic.

Figure 6. Error Amplifier Open-Loop Gain and

Phase vs. Frequency.

7

6

5

4

3

2

1

0

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

OUTPUT CURRENT (A)

SOURCE

SINK

15

10

5

100

200

100

200

10nF

1nF

1nF

10nF

(ns)

Figure 9. Output Rise/Fall Time.

Figure 8. Output Drive Saturation Voltage vs.

Output Current.

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.