FOD8316 Datasheet, PDF (22/29 Pages) Fairchild Semiconductor – 2.5A Output Current, IGBT Drive Optocoupler

Application Information
5V _{+ 0.1μF}
1kΩ ^–
330pF
FOD8316
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_SS 10
8 V_LED1-
V_SS 9
C2
C3
1μF
10μF
100pF _DDESAT
100Ω
+–
V_F
+ ^{VDD2 = 15V}
Q1
C1
–
1μF
Rg
D1
+
–
V_SS = –8V
Q2
*Pin 8 (V_LED1-) is internally connected to pin 4 (GND1).
+
V_CE
–
3-Phase
Output
+
V_CE
–
Figure 50. Recommended Application Circuit
Functional Description
The typical application circuit is shown in Figure 50 and
the functional behavioral of the FOD8316 is illustrated by
the detailed internal schematic shown in Figure 51. This
helps explain the interaction and sequence of internal
and external signals, together with the timing diagrams.
1. Non-Inverting and Inverting Inputs
There are two CMOS/TTL compatible inputs, V_IN+ and
V_IN- to control the IGBT, in non-inverting and inverting
configurations respectively. When V_IN- is set to low, V_IN+
controls the driver output, V_O, in non-inverting configura-
tion. When V_IN+ is set to high, V_IN- controls the driver
output in inverting configuration.
The relationship between the inputs and output are
illustrated in the Figure 52.
During normal operation, when no fault is detected, the
FAULT output, which is an open-drain configuration, will
be latched to high state. This allows the gate driver to be
controlled by the input logic signal.
When a fault is detected, the FAULT output will be
latched to low state. This condition will remain until the
RESET pin is also pulled low for a period longer than
PW_RESET. While setting the RESET pin to a low state,
the input pins must be pulled to low to ensure an output
state (V_IN+ is low or V_IN- is high).
V_DD1 ³
V_IN+ ¹
V_IN– ²
6
FAULT
4
GND1
V_LED1– ⁸
5
RESET
Delay
Q
RS
V_LED+
7 Gate Drive
Optocoupler
250μA
+
14 _DESAT
– _VDESAT
UVLO Comparator
–
+ _12V
16 _VE
13 _VDD2
12 _VS
Fault Sense
Optocoupler
5μs Pulse
Generator
15
V_LED2+
Figure 51. Detailed Internal Schematic
11 _VO
50x
1x
9,10 _VSS
©2010 Fairchild Semiconductor Corporation
FOD8316 Rev. 1.2.0
22
www.fairchildsemi.com