Output stage

AN2123

4/15

4 Output stage

The output stage is able to sink/source about 1.7 A / 1.3 A typical at 25°C with a voltage drop VOL/VOH

of 6 V (see Figure 6). The minimum sink/source currents over the full temperature range (-20°C/+125°C)

are 1 A sink and 0.75 A source. VOL and VOH voltage drops at 0.5 A are guaranteed to 2.5 V and 4 V

maximum respectively, over the temperature range (see Figure 7). This current capability sets the limit of

IGBT driving, and the IGBT gate resistor should not be lower than about 15

Ω.

Figure 6. Typical Output stage current capability at 25°C (VH=16V)

Figure 7. Typical VOL and VOH voltage variation with temperature

OUT source current versus voltage (turn-on)

0.0

0.5

1.0

1.5

2.0

2.5

0

5

10

15

Vout (V)

OUT sink current versus voltage (turn-off)

0.0

0.5

1.0

1.5

2.0

2.5

05

10

15

Vout (V)

Low level output voltage vs. Temperature

0.0

1.0

2.0

3.0

-50

-25

0

25

50

75

100

125

Temp (°C)

Iosink=500mA

Iosink=20mA

High level output voltage vs. Temperature

0.0

1.0

2.0

3.0

4.0

-50

-25

0

25

50

75

100

125

Temp (°C)

Iosource=500mA

Iosource=20mA