Is Now Part of
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FAN3181
Single 2A High-Speed, Low-Side
IGBT Driver
The FAN3181 is suitable for designed to stand-alone IGBT driver in lowside switching applications by providing high peak current pulses during
the switching intervals. The protection functions include Under-Voltage
Lockout (UVLO) and Over-Current Protection (OCP), and Desaturation
Protection (DESAT) with fault-out function and active miller clamp
function. An open-drain fault-out signal is provided to indicate that an
over-current, under-voltage, and Desaturation detect has occurred. Soft
turn-off feature is used to increase the reliability of an application during
short-circuit or over-current periods. This feature works after the
desaturation or over-current protection is activated, which provides protection for IGBT against short-circuit and over-current events. With the
“Soft” turn-off feature, the gate voltage will be reduced slowly in order to
reduce IGBT current.
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PACKAGE PICTURE
8 Lead SOP
(Small Outline Package)
Features
MARKETING DIAGRAM
Operating Supply Voltage 25 V
Typically 1.5 A/2.0 A Sourcing/Sinking Current-Driving Capability
at VCC = 15 V
ZXYTT
FAN3181T
MX
Output In- Phase with Input Signal
Active Miller Clamp
Desaturation Protection
F: Fairchild Logo
Z: Plant Code
X: 1-Digit Year Code
Y: 1-Digit Week Code
TT: 2-Digit Die Run Code
M: Package Type (SOP)
X: Packing Type (Tape & Reel)
Cycle-by-Cycle Edge-Triggered Shutdown Function
Fault-Out and Shutdown Function
Built-in VCC UVLO Function
Built-in Soft Turn-Off Function
PIN CONNECTIONS
Built-in Over-Current Protection (OCP)
Operating Junction Temperature Range of -40°C to 125°C
IN 1
Typical Applications
8
DESAT
7
OUT
VCC 3
6
GS
GND 4
5
CIN
FO/SD 2
Switch-Mode Power Supplies
FAN3181
DC – DC Converters
Motor Control for PFC in Air-conditioner Application
ORDERING INFORMATION
Device
Package
Packing
Method
FAN3181TMX (1)
SOIC-8
Tape & Reel
Note:
1.
© Semiconductor Components Industries, LLC, 2013
December 2016- Rev. 1.0
1
This device passed wave-soldering test by
JESD22A-111
Publication Order Number:
FAN3181/D
FAN3181
L
D
VOUT
VDC
COUT
15 V
Controller
ROUT
VDD
INPUT
1
IN
FO/SD
2
FO/SD
3
VCC
GS 6
4
GND
CIN 5
GND
DESAT 8
OUT
7
Figure 1 Simplified Application Schematics
UVLO
IN
VCC
{VCCUV=12 V with VCCHYS=1 V
& tVCCUV=10 us}
100 k
GND
SHUTDOWN
DRIVER
EXTERNAL SD
FO/SD
CYCLE-By-CYCLE
SHUTDOWN
OUT
ISOFT
100 k
SOFT_OFF
FAULT
VCC
UVLO
Q
IDESAT
GS
S
LATCH
Q
OCP
R
CLAMP
TFO
5.4R
DESAT
DESAT
CS_COMP
CIN
R
1.0 V
LEB
TIMER
0.5 V
Desat
Blanking
Timer
Figure 2. Detailed Block Diagram
IN 1
8 DESAT
DESAT
VCC
FAULT
VCC 3
UVLO
CONTROL
LOGIC
FO/SD 2
7
OUT
6
GS
5
CIN
CLAMP
GND 4
OCP
Figure 3. Simplified Block Diagram
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2
100 k
FAN3181
PIN CONNECTIONS
IN 1
8
DESAT
FO/SD 2
7
OUT
VCC 3
6
GS
GND 4
5
CIN
FAN3181
Figure 4. Pin Assignments – 8 Lead SOIC
(Top View)
PIN FUNCTION DESCRIPTION
Pin Name
Pin No.
I/O/x
IN
1
I
FO/SD
2
O
Description
Input signal to control the output. IN has a pull-down resistor of 100 k.
Output In-Phase with Input Signal (Non-Inverting).
Fault output and shutdown that allows communication to main controller that the
drivers has encountered a fault condition and deactivated the output.
Power Supply. The bypass capacitor is required this pin to GND and should be
placed as close as possible to the VCC pin.
VCC
3
x
GND
4
x
This pin should connect to the IGBT Emitter or shunt resistor with short trace.
CIN
5
I
Analog Input for Over-Current detect
O
Provides clamping for the IGBT gate during the off period to protect it from parasitic
turn-on due to high collector-to emitter dv/dt induced.
GS
6
OUT
7
O
Driver Output.
DESAT
8
I
Input for detecting the desaturation of IGBT due to fault condition.
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3
FAN3181
MAXIMUM RATINGS (Note 2)
Rating
Symbol
Min.
Max.
Unit
VCC
-0.3
30.0
V
Output 1 Voltage
VOUT
-0.3
VCC+0.3
V
Output 2 Voltage
VGS
-0.3
VCC+0.3
V
IN, FO/SD, DESAT, VCIN, and VFO Voltage
VIN
-0.3
VCC+0.3
V
TJ
-55
150
°C
TSTG
-55
150
°C
ESDHBM
2
kV
ESDCDM
500
V
Fixed Supply Voltage
(3)
Operating Junction Temperature
Storage Temperature Range
Electrostatic Discharge
Capability
Human Body Model
(4)
Charged Device Model
(4)
2. Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device
functionality should not be assumed, damage may occur and reliability may be affected.
3. Refer to ELECTRICAL CHARACTERISTICS, RECOMMENDED OPERATING RANGES and/or APPLICATION INFORMATION for Safe
Operating parameters.
4. This device series incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per JESD22-A114
ESD Charged Device Model tested per JESD22-C101
5. All voltage values are given with respect to GND pin.
THERMAL CHARACTERISTICS
Rating
Thermal Characteristics, 8-SOP(6)
Thermal Resistance Junction-Air(7)
Symbol
Value
Unit
θJA
200
°C/W
(7)
Power Dissipation
PD
0.625
W
6. Refer to ELECTRICAL CHARACTERISTICS, RECOMMENDED OPERATING RANGES and/or APPLICATION INFORMATION for Safe
Operating parameters.
7. JEDEC standard: JESD51-2, JESD51-3. Mounted on 76.2×114.3×1.6mm PCB (FR-4 glass epoxy material).
RECOMMENDED OPERATING CONDITIONS (Note 8)
Rating
Symbol
Min.
Max.
Unit
Fixed Supply Voltage
VCC
UVLO
25
V
Input Voltage
VIN
0
VCC
V
Operating Ambient Temperature Range
TA
-40
125
°C
8. Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses
beyond the Recommended Operating Ranges limits may affect device reliability.
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4
FAN3181
ELECTRICAL CHARACTERISTICS
VCC=15 V, for typical values TA=25 °C, for min/max values TA=-40°C to +125°C, unless otherwise specified. (Notes 10, 11)
Test Conditions
Symbol
Min.
Typ.
Max.
Parameter
POWER SUPPLY SECTION
Quiescent Current for VCC
VIN= 0 V
IQCC
Operating Current for VCC
fIN= 20 kHz
ICC
600
Unit
850
1050
A
1.5
2.0
mA
V
VCC Supply UV Trip Voltage
VCCUV
11.0
12.0
13.0
VCC Supply UV Hysteresis
VCCHYS
0.5
1.0
1.5
V
VCC Supply UV Filter Time(9)
INPUT LOGIC SECTION
High Level Input Voltage for IN
tVCCUV
5
10
15
s
1.6
2.0
V
Low Level Input Voltage for IN
VILT
VIHT
1.2
125
150
200
1.0
A
75
100
120
k
0.8
V
0.35
V
VINHYST
Input Logic Hysteresis
High Level Logic Input Bias Current
VIN= VCC
Low Level Logic Input Bias Current
VIN= 0 V
IIN+
V
0.4
IINRIN
Logic Input Pull-Down Resistance
GATE DRIVER OUTPUT SECTION
V
0.8
A
IOUT=100 mA
VOH
Low Level Output Voltage
IOUT=100 mA
VOL
Output HIGH Short-Circuit Pulse Current(9)
VO=0 V, VIN=5 V with PW=10 µs
IO+
1.0
1.5
A
Output LOW Short-Circuit Pulse Current(9)
VO=15 V, VIN=0 V with PW=10 µs
IO-
1.5
2.0
A
Soft Turn-Off Sink Current
VCIN=1 V, VO=VCC
ISOFT
20
30
40
mA
VCINTH
ICIN
450
5
500
10
550
15
mV
µA
VDESAT
IDESAT
RONSAT
6.0
215
6.4
250
2.5
6.8
285
5.0
V
µA
VGSTH
VCLAMP
IGSCLAMP
RONCLAMP
1.2
1.5
110
1.0
2.2
1.8
250
V
mV
A
4.5
1.6
1.2
2.0
V
V
µA
V
High Level Output Voltage (VCC- VOUT)
OVER-CURRENT PROTECTION SECTION
Over-Current Detect Threshold
Short-Circuit Input Current
DESATURATION PROTECTION SECTION
Desaturation Threshold Voltage
Current Source
Switch On Resistance
ACTIVE MILLER CLAMP SECTION
GS Pin Threshold Voltage
GS Pin Low Level Clamp Voltage
GS Pin Clamp Current(9)
Clamp Switch Resistance
FAULT-OUTPUT SECTION
FO/SD High Threshold Voltage
FO/SD Low Threshold Voltage
Fault Output Leakage Current
Fault Output Low Level Voltage
VCIN=1 V
IN=HIGH
IGS=50 mA
VGS=GND + 2.5 V
VFOSDH
VFOSDL
IFOSDLK
VFOL
VFOSD=VCC
0.5
0.8
1.0
0.1
VMCU=5 V, RPULLUP=20 k
Fault Output On Resistance
IFO=5 mA
RDSFO
250
400
9. This parameter, although guaranteed by design, is not tested in production.
10. Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted.
Product performance may not be indicated by the Electrical Characteristics if operated under different conditions.
11. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at T J = TA = 25C.
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5
FAN3181
DYNAMIC ELECTRICAL CHARACTERISTICS
VCC=15 V, and CLOAD = 1000 pF, for typical values TA=25 °C, for min/max values TA=-40°C to +125°C, unless otherwise specified. (13, 14)
Parameter
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Turn-On Propagation Delay
VIN From 0 V to 5 V
tON
10
15
20
ns
Turn-Off Propagation Delay
VIN From 5 V to 0 V
tOFF
12
17
22
ns
12
ns
20
ns
Propagation Delay Mismatching I tON-tOFF I
MT
Turn-On Rise Time
tR
Turn-Off Fall Time
15
tF
Fault Output Duration
Desat Blanking Time
VDESAT = 6.5 V
10
17
ns
tFAULT
75
110
145
µs
tDESABLK
1.8
2.8
3.8
µs
FO/SD to Output LOW Propagation Delay
tFOSD
17
22
ns
CIN Pin Leading-Edge Blanking Time(12)
tCINBLT
300
400
ns
Time from CIN Triggering to FO
From VCIN=1 V to FO Turn-Off
tCINFO
250
350
450
ns
Time from CIN Triggering to Output Turn-Off
From VCIN=1 V to Gate Turn-Off
tCINOFF
330
430
530
ns
6
10
ns
330
430
530
ns
Time from Clamp Triggering to Output Turn-Off
(12)
tCLAMP
Time from DESAT Triggering to Output Turn-Off
tDESAT
Minimum Input Pulse Width Response at the Output(12)
tONMIN
40
ns
12. This parameter, although guaranteed by design, is not tested in production.
13. Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
14. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at TJ = TA = 25C.
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6
FAN3181
TYPICAL CHARACTERISTICS
900
890
Min
870
860
850
Typ
860
840
820
840
800
-40℃
830
13
14
15
16
17
18
19
20
21
VCC , Supply Voltage [V]
22
23
24
25
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [ o C]
Figure 5.Quiescent Supply Current vs. VCC Supply
Voltage
Figure 6.Quiescent Supply Current vs. Temperature
1.60
2.3
Min
20 KHz
50 KHz
100 KHz
150 KHz
200 KHz
2.1
Max
Operating Current [mA]
2.2
Operating Current [mA]
Max
880
Quicient Current [uA]
Quicient Current [uA]
880
2.0
1.9
1.8
1.7
Typ
1.55
1.50
1.45
1.6
1.5
1.40
1.4
15
20
VCC , Supply Voltage [V]
-40℃
25
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [ o C]
Figure 7. Operating Supply Current vs. VCC Supply
Voltage
Figure 8. Operating Supply Current vs. Temperature
1.8
7
VCC=15 V
VCC=15 V
VCC=20 V
6
OPERATING CURRENT [mA]
VCC=20 V
1.6
Operation Current [mA]
-30℃
VCC=25 V
1.4
1.2
1
VCC=25 V
5
4
3
2
1
0.8
0
20
50
100
Switching Frequency [kHz]
150
200
Figure 9.Operating Supply Current vs. Switching
Frequency (No Load)
20
50
100
FREQUENCY [kHz]
150
200
Figure 10.Operating Supply Current vs. Switching
Frequency (CLOAD = 1 nF)
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7
FAN3181
1.7
1.7
1.6
1.6
Input Logic Threshold Voltage [V]
Input Logic Threshold Voltage [V]
TYPICAL CHARACTERISTICS
1.5
1.4
VINH
1.3
VINL
1.2
1.1
13
14
15
16
17
18
19
20
21
VCC , Supply Voltage [V]
22
23
24
1.5
1.4
VINH
1.2
1.1
-40℃
25
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Figure 11. Input Threshold Voltage vs. VCC Supply
Voltage
Figure 12. Input Threshold Voltage vs. Temperature
18
20
TON
19
TOFF
TON
TOFF
17
Propagtion Delay Time [ns]
Propagation Delay Time [ns]
VINL
1.3
16
15
18
17
16
15
14
13
14
13
14
15
16
17
18
19
20
21
VCC , Supply Voltage [V]
22
23
24
12
-40℃
25
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Figure 13.Propagation Delay Time vs. VCC Supply
Voltage
Figure 14.Propagation Delay Time vs. Temperature
17
18
TR
16
17
TF
16
TR
TF
Rise/fall Time [ns]
Rise/Fall Time [ns]
15
14
13
12
11
15
14
13
12
11
10
10
9
9
13
14
15
16
17
18
19
20
21
VCC , Supply Voltage [V]
22
23
24
25
8
-40℃
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Figure 15.Output Rise/Fall Time vs. VCC Supply Voltage
Figure 16.Output Rise/Fall Time vs. Temperature
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8
FAN3181
TYPICAL CHARACTERISTICS1
450
450
Min
DESAT to OUT OFF Delay Time [ns]
440
t DESAT [ns]
Max
430
420
440
430
420
410
-40℃
410
13
14
15
16
17
18
19
20
21
VCC , Supply Voltage [V
22
23
24
Typ
25
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Figure 17. DESAT Triggering to Output OFF Delay Time
vs. VCC Supply Voltage
Figure 18. DESAT Triggering to Output OFF Delay Time
vs. Temperature
120
130
Min
Fault-Out Duration Time [us]
tFAULT [us]
Max
110
120
110
100
90
-40℃
100
13
14
15
16
17
18
19
20
21
VCC , Supply Voltage [V]
22
23
24
Typ
25
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Figure 19. Fault Output Duration vs. VCC Supply Voltage
Figure 20. Fault Output Duration vs. Temperature
20
18
Min
19
FO/SD Delay Time [ns]
tFOSD [ns]
Max
17
Typ
18
17
16
15
16
13
14
15
16
17
18
19
20
21
VCC , Supply Voltage [V]
22
23
24
25
14
-40℃
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Figure 21. FO/SD to Output LOW Propagation Delay
vs. VCC Supply Voltage
Figure 22. FO/SD to Output LOW Propagation Delay
vs. Temperature
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9
FAN3181
TYPICAL CHARACTERISTICS
360
370
Min
CIN to FO Delay Time [ns]
t CINFO [ns]
Max
350
14
15
16
17
18
19
20
21
VCC , Supply Voltage [V]
22
23
24
350
340
330
-40℃
340
13
Typ
360
25
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Figure 23. CIN Triggering to FO Delay Time
vs. VCC Supply Voltage
Figure 24. CIN Triggering to FO Delay vs. Temperature
450
440
CIN to OUT OFF Delay Time [ns]
tCINOFF [ns]
Min
430
14
15
16
17
18
19
20
21
VCC , Supply Voltage [V]
22
23
24
Typ
430
420
410
-40℃
420
13
Max
440
25
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Figure 25. CIN Triggering to Output Low Delay
vs. VCC Supply Voltage
Figure 26. CIN Triggering to Output Low Delay
vs. Temperature
280
3
Min
Min
Desaturation Blanking Time [us]
Desauration Charge Current [uA]
Max
270
Typ
260
250
240
230
-40℃
-30℃
-15℃
0℃
25℃
50℃
Temperature
75℃
90℃
110℃
125℃
Max
2.9
Typ
2.8
2.7
2.6
-40℃
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
[o C]
Figure 27. Desaturation Charge Current vs. Temperature
Figure 28. Desaturation Blanking Time vs. Temperature
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10
FAN3181
TYPICAL CHARACTERISTICS
6.5
3.5
Min
Max
Typ
Desaturation Switch R DSON []
Desaturation Threshold Voltage [V]
Min
6.4
6.3
-40℃
Max
3.0
Typ
2.5
2.0
1.5
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
-40℃
-30℃
-15℃
0℃
Temperature [o C]
Figure 29. Desaturation Threshold Voltage
vs. Temperature
50℃
75℃
90℃
110℃
125℃
Figure 30. Desaturation Blanking Switch RDSON
vs. Temperature
1.55
13.0
VCCUH
Min
1.54
Max
VCCUL
Clamp Threshold Voltage [V]
12.5
UVLO Threshold Voltage [V]
25℃
Temperature [o C]
12.0
11.5
11.0
1.53
Typ
1.52
1.51
1.5
1.49
1.48
1.47
10.5
1.46
1.45
-40℃
10.0
-40℃
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Temperature [ o C]
Figure 31. VCC UVLO Threshold Voltage vs. Temperature
Figure 32. Clamp Threshold Voltage vs. Temperature
0.16
2.9
Min
Max
0.14
Typ
Clamp Low Voltage [V]
Clampr Switch R DSON []
Min
Max
2.7
2.5
2.3
2.1
1.9
Typ
0.12
0.1
1.7
1.5
-40℃
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
0.08
-40℃
Temperature [o C]
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Temperature [o C]
Figure 33. Clamp Switch RDSON vs. Temperature
Figure 34. GS Pin Clamp Low Level Voltage at IGS=50 mA
vs. Temperature
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FAN3181
TYPICAL CHARACTERISTICS
0.5
280
Min
VOH
270
0.3
0.2
0.1
0
-40℃
-30℃
-15℃
0℃
25℃
50℃
250
240
75℃
90℃
110℃
220
-40℃
125℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Figure 36. Fault-Out Switch RDSON vs. Temperature
102
32
Input Logic Pull-down Resistance [k]
Min
Max
Typ
31
30
29
28
-30℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
125℃
Min
Max
101
Typ
100
99
98
-40℃
Temperature [o C]
Min
Max
Typ
502
500
498
496
-30℃
-15℃
0℃
25℃
50℃
-15℃
0℃
25℃
50℃
75℃
90℃
110℃
Figure 38. Input Logic Pull-down Resistance
vs. Temperature
506
504
-30℃
Temperature [ o C]
Figure 37. Soft-Off Sink Current vs. Temperature
OCP Detect Threshold Voltage [mV]
-15℃
Temperature [o C]
33
494
-40℃
-30℃
[ o C]
Figure 35. Output Voltage at IO=100 mA vs. Temperature
Soft Turn-off Current [mA]
Typ
260
230
Temperature
27
-40℃
Max
VOL
FO Switch R DSON []
Output Voltage [V]
0.4
75℃
90℃
110℃
125℃
Temperature [ o C]
Figure 39. CIN Threshold Voltage vs. Temperature
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12
125℃
FAN3181
DEFINITIONS
Input to Output Switching Time Definitions
Figure 40 shows an input to output timing diagram when external shutdown (Case-A), Under-voltage lockout (Case-B), and
Over-current (Case-C) and Desaturation Protection (Case-D) events.
A
B
C
D
IN
Disregard
Disregard
VCIN
Disregard
Disregard
VCINTH=0.5 V
VCCUVH=12 V
VCCUVL=11 V
VCC
UVLO
VDESAT=6.4 V
VDESAT
FO/SD
tFAULT
tFAULT
OUT
Cycle-by-Cycle
tFAULT
Cycle-by-Cycle
Cycle-by-Cycle
Soft Off
Soft Off
Hard Shutdown
Over-Current Protection
tFAULT
Soft Off
Desat Protection
Figure 40. Overall Operating Waveforms Definitions
Switching Time Definitions
Figure 41 shows an input to output switching timing diagram. The output signal is HIGH when input signal is HIGH
(Output In-phase with input signal).
IN
50%
tON
50%
tR
tOFF
90%
OUT
10%
tF
90%
10%
Figure 41. Switching Time Waveforms Definitions
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FAN3181
APPLICATIONS INFORMATION
This section lists the detail about key features and
operating for the FAN3181.
Input Stage
The input pins of FAN3181 gate-driver devices are
based on a TTL compatible input-threshold logic that is
independent of the VCC supply voltage. The logic level
compatible input provides a typically high threshold of
1.6 V and a typically low threshold of 1.2 V. The input
impedance of the FAN3181 is 100 kΩ typically, as
shown in the block diagrams. We recommends an RC
filter to be added on the input pin for reducing the
impact of system noise and ground bounce, the time
constant of the RC filter, for example, 100 Ω with 1 nF
is an acceptable choice.
Shutdown Function
The FAN3181 provide an external shutdown function
when FO/SD pin voltage is below typically 1.2 V. The
fault-out signal is report to the FO/SD pin and an
external RC network is connected to this FO/SD pin in
order to provide an adjustable gate driver disable time,
which is consist the internal default fault-clear time
(typically 110 µs) and shutdown time that follows the
fault condition. The FAN3181 shutdown architecture
allows immediate turn-off of the outputs of the gate
driver in the case of fault, by minimizing the propagation
delay between the fault detection event and the actual
output switch-off. In fact, the time delay between the
fault detection and the output turn-off is no longer
dependent on the value of the external RC network
connected to the FO/SD pin. In the shutdown circuitry
the fault signal has a preferential path which directly
switches off the outputs after the shutdown logic
triggering. At the same time the internal logic turns on
the open drain fault-out switch and holds it during
default fault-clear time (typically 110 µs) and until the
FO/SD voltage goes above the shutdown (FO/SD) logic
input threshold (typically 1.6 V). When such threshold is
reached, the open drain output is turned off, allowing the
external pull-up to recharge the capacitor. The driver
outputs restart following the input pins as soon as the
voltage at the FO/SD pin reaches the higher threshold of
the shutdown logic input.
IN
The shutdown system provides the possibility to increase
the time constant of the external RC network (that
determines the disable time after the fault event) up to
very large values without increasing the delay time of
the protection as shown in Figure 43.
VBIAS
UVLO
VCC
{VCCUV=12 V with VCCHYS=1 V
& tVCCUV=10 us}
RPULL
SHUTDOWN
FO/SD
CYCLE-By-CYCLE
SHUTDOWN
IN
GND
CSD
OUTPUT
FAULT
UVLO
DESAT
OCP
SET
RESET
Delayed Q
S
Q
LATCH
R
Q
TFO
[100 us]
Figure 43. Application Circuit of Fault-Out
An approximation of the disable time is calculated by
equation (1):
TDISABLE = TFAULT + TSD
(1)
Where, TFAULT = 110 µs, VFOSDH = 1.6 V,
. We recommended pull-up resistance (RPULL) value
is 20 k. The Fault Output (FO) stays in the low state
until the fault condition has been removed or the fault
clear time (TFAULT) expires; once the fault clear timer
expires, allowing the external pull-up resistor to recharge
the capacitor. When FO/SD pin voltage is reached
threshold, the driver outputs restart following the input
signal.
Output Stage
The output stage is able to sink/source about 2.0 A/1.5 A
typical at 25°C and the minimum sink/source currents
over the full temperature range (-40°C / +125°C) are
1.5 A sink and 1.0 A source. Soft turn-off switch in the
output drive stage will turn on to softly turn off the
IGBT and prevents large di/dt induced voltages when
fault conditions are occurred. This device slowly
discharges the IGBT gate to prevent fast changes in
collector current that could cause damaging voltage
spikes due to stray inductances. During the slow turn off,
the output stage device remains off.
Protection Function
FAN3181 provide the protection features include VCC
Under-voltage lockout (UVLO), external shutdown
(Externally FO/SD pin is LOW), Over-Current
Protection (OCP) or Desaturation protection and the
FO/SD pin is internally pulled to GND when above
mentioned fault events happened.
OUT
Protection
Status
Disregard
FO/SD
Cycle-by-Cycle
Shutdown
External Shutdown
t1
t2
t3
Figure 42. Timing chart of fault and shutdown
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FAN3181
Fault-Out (FO) Function
FAN3181 provide the fault-out signal when VCC Undervoltage lockout (UVLO), Desaturation protection or
Over-current (OCP) events happened as shown in Figure
44. The fault output (FO/SD) pin stays in the low state
until the fault condition has been removed and the fault
clear timer (TFAULT, typically 110 µs) expires; once the
fault clear timer expires, the voltage on the FO/SD pin
will return to pull-up voltage.
FO/SD
UVLO
DESAT
OCP
SET
S
RESET
R
Delayed Q
Q
Q
FAULT
LATCH
Q
TFAULT
[110 us]
Figure 44. Functional Block of Fault-Out
Table 1. UVLO Conditions
Case
Case 1
t
Case 2
t
Case 3
t
Condition
>t
t
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