FOD8318 Datasheet, PDF (22/31 Pages) Fairchild Semiconductor – 2.5 A Output Current, IGBT Drive Optocoupler with Active Miller Clamp, Desaturation Detection, and Isolated Fault Sensing

Test Circuits (Continued)
5V
+
–
0.1 μF
3 kΩ
FOD8318
1 V_IN+
V_E 16
2 V_IN–
V_LED2+ 15
3 V_DD1
DESAT 14
4 GND1
V_DD2 13
5 RESET
V_S 12
6 FAULT
V_O 11
7 V_LED1+
V_CLAMP 10
8 V_LED1-*
V_SS 9
0.1 μF
+
0V _–
0.1 μF
30 V
+
–
I_CLAMPL
+
Pulsed
– ^VCLAMP
*Pin 8 (V_LED1-) is internally connected to pin 4 (GND1).
Figure 51. Clamp Low Level Sinking Current (I_CLAMPL)
5V
+
–
0.1 μF
A S1
B
3 kΩ
FOD8318
1 V_IN+
V_E 16
2 V_IN–
V_LED2+ 15
3 V_DD1
DESAT 14
4 GND1
V_DD2 13
5 RESET
V_S 12
6 FAULT
V_O 11
7 V_LED1+
V_CLAMP 10
8 V_LED1-*
V_SS 9
0.1 μF
0V
+
–
0.1 μF
30 V
+
–
50 Ω
+ Sweep from
– _{3 V to VCLAMP_THRES}
*Pin 8 (V_LED1-) is internally connected to pin 4 (GND1).
Initially set S1 to A before connecting 3 V to clamp pin. Then switch to B before sweeping down
to get the V_{CLAMP_THRES}, clamping threshold voltage.
Figure 52. Clamp Pin Threshold Voltage (V_CLAMP)
©2010 Fairchild Semiconductor Corporation
FOD8318 Rev. 1.1.2
22
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