FOD3181_08 Datasheet, PDF (11/12 Pages) Fairchild Semiconductor – 0.5A Ouput Current, High Speed MOSFET Gate Driver Optocoupler

I_OH and I_OL Test Conditions
This device is tested and specified when driving a com-
plex reactive load. The load consists of a capacitor in the
series with a current limiting resistor. The capacitor rep-
resents the gate to source capacitance of a power
MOSFET transistor. The test load is a 0.03uF capacitor
in series with an 40Ω resistor. The LED test frequency is
10.0kHz with a 50% duty cycle. The combined I_OH and
I_OL output load current duty factor is 0.6% at the test
frequency.
Figure 14 illustrates the relationship of the LED input
drive current and the device’s output voltage and sourc-
ing and sinking currents. The 0.03µF capacitor load rep-
resents the gate to source capacitance of a very large
power MOSFET transistor. A single supply voltage of
20V is used in the evaluation.
Figure 15 shows the test schematic to evaluate the out-
put voltage and sourcing and sinking capability of the
device. The I_OH and I_OL are measured at the peak of
their respective current pulses.
LED
20V
OUTPUT
0
Load
Current
I_F = 8mA
ON
P-Channel (ON)
I_OH = 0.5A
OFF
N-Channel (ON)
I_OL = 0.5A
1µs/Div
Figure 14. FOD 3180 Output Current and Output Voltage vs. LED Drive
Pulse
Generator
1
2
IF_MON
3
100Ω
100Ω
4
FOD3181
8
7 ^VO
0.33µF
6
0.1µF
IO_MON
40Ω
22µF
5
Figure 15. Test Schematic
©2003 Fairchild Semiconductor Corporation
FOD3181 Rev. 1.0.8
11
www.fairchildsemi.com