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FAN7842 Half Bridge Gate Driver
January 2006
FAN7842 Half Bridge Gate Driver
Features
Floating Channels Designed for Bootstrap Operation to +200V. Typically 350mA/650mA Sourcing/Sinking Current Driving Capability for Both Channels Common-Mode dv/dt Noise Canceling Circuit Extended Allowable Negative VS Swing to -9V for Signal Propagation @ VCC=VBS=15V VCC & VBS Supply Range from 10V to 20V UVLO Functions for Both Channels TTL Compatible Input Logic Threshold Levels Matched Propagation Delay Below 50nsec Output In-phase with Input
Description
The FAN7842, a monolithic half-bridge gate driver IC, can drive MOSFETs and IGBTs which operate up to +200V. Fairchild's high voltage process and common-mode noise canceling technique provides stable operation of the high-side driver under high dv/dt noise circumstances. An advanced level shift circuit allows high-side gate driver operation up to VS=-9.8 V(typ.) for VBS=15V. The input logic level is compatible with standard TTLseries logic gates. UVLO circuits for both channels prevent malfunction when VCC and VBS are lower than the specified threshold voltage. Output driver current(source/sink) is typically 350mA/650mA, respectively.
8 SOP
Applications
Half and Full Bridge Converters Current Fed Push-Pull Converters Synchronous Buck Converters
1
Ordering Information
Part Number
FAN7842M FAN7842MX
Operating Temp. Range
-40C to +125C
Pb-Free
Yes
Package
8-SOP
Packing Method
Tube Tape & Reel
(c)2006 Fairchild Semiconductor Corporation
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FAN7842 Rev.1.0.0
FAN7842 Half Bridge Gate Driver
Typical Application Diagram
DB VB C BS 7 HO U p to 2 0 0 V
VC C VC C 1
8
2 HIN
FAN7842
Internal Block Diagram
High-SideDriver Level Shifter NOISE CANCELLER
On / Off Controller
4 C OM
6 VS L OAD LO
3 LIN
5
8
DRIVER
VB HO VS
UVLO RR Q S
7 6
HIN 2
500kW
DELAY
Pulse Generation
Low-Side Driver UVLO
1
DRIVER
VCC
LIN 3
DELAY
DELAY
5
LO
500kW
4
COM
FAN7842 Rev. 1.0.0
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FAN7842 Half Bridge Gate Driver
Pin Assignments
VCC
1
8
VB
FAN7842
HIN
2
7
H O
LIN
3
6
VS
COM
4
5
LO
Pin Definitions
Pin Number Pin Name
1 2 3 4 5 6 7 8 VCC HIN LIN COM LO VS HO VB
I/O
I I I O I O I
Pin Function Description
Low Side Supply Voltage Logic Input for High Side Gate Driver Output Logic Input for Low Side Gate Driver Output Logic Ground and Low Side Driver Return Low Side Driver Output High Voltage Floating Supply Return High Side Driver Output High Side Floating Supply
FAN7842 Rev. 1.0.0
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FAN7842 Half Bridge Gate Driver
Absolute Maximum Ratings
Parameter
High side offset voltage High side floating supply voltage High side floating output voltage HO Low side and logic fixed supply voltage Low side output voltage LO Logic input voltage(HIN, LIN) Logic ground Allowable offset voltage SLEW RATE Power dissipation Thermal resistance, junction to ambient Junction temperature Storage temperature
Symbol
VS VB VHO VCC VLO VIN COM dVs/dt PD Rthja TJ TS
Min.
VB-25 -0.3 VS-0.3 -0.3 -0.3 -0.3 VCC-25 -
Max.
VB+0.3 225 VB+0.3 25 VCC+0.3 VCC+0.3 VCC+0.3 50 0.625 200 150 150
Unit
V
V/ns W C/W C C
Note: Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters are absolute voltage referenced to COM, all currents are defined positive into any lead.
Recommended Operating Ratings.
Parameter
High side floating supply voltage High side floating supply offset voltage High side(HO) output voltage Low side(LO) output voltage Logic input voltage(HIN, LIN) Low side supply voltage Ambient temperature Symbol VB VS VHO VLO VIN VCC TA Min. VS+10 6-VCC VS COM COM 10 -40 Max. VS+20 200 VB VCC VCC 20 125 C V Unit
ESD Level
Parameter
Human Body Model (HBM) Machine Model (MM) Charged Device Model (CDM) All Pins
Pins
Conditions
R=1.5k, C=100pF C=200pF
Level
2000 300 500
Unit
V
Note : The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. Pin6,Pin7 and Pin8 are rated at 1500V.
FAN7842 Rev. 1.0.0
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FAN7842 Half Bridge Gate Driver
Electrical Characteristics
(VBIAS(VCC, VBS)=15.0V, TA = 25C, unless otherwise specified. The VIN, VTH and IIN parameters are referenced to COM. The VO and IO parameters are referenced to COM and VS is applicable to HO and LO.) Parameter
VCC and VBS supply under voltage positive going threshold VCC and VBS supply under voltage negative going threshold VCC supply under voltage lockout hysteresis Offset supply leakage current Quiescent VBS supply current Quiescent VCC supply current Operating VBS supply current Operating VCC supply current Logic "1" input voltage Logic "0" input voltage High level output voltage, VBIAS-VO Low level output voltage, VO Logic "1" input bias current Logic "0" input bias current Output high short circuit pulse current Output low short circuit pulsed current Allowable negative VS pin voltage for HIN signal propagation to HO
Symbol
VCCUV+ VBSUV+ VCCUVVBSUVVCCUVH VBSUVH ILK IQBS IQCC IPBS IPCC VIH VIL VOH IO=20mA VOL IIN+ IINIO+ IOVS VIN=5V VIN=0V -
Condition
Min.
8.2 7.6 2.9 250 500 -
Typ.
9.2 8.7 0.6 45 70 10 1.0 350 650 -9.8
Max.
10.0 9.6 10 120 180 600
Unit
V
VB=VS=200V VIN=0V or 5V VIN=0V or 5V fin=20kHz,rms value fin=20kHz,rms value -
uA
uA 600 0.8 V 1.0 0.6 20 uA 2.0 mA -7 V
VO=0V, VIN=5V with PW<10us VO=15V=VB,VIN=0V with PW<10us -
Dynamic Electrical Characteristics
VBIAS(VCC, VBS)=15.0V, VS=GND, CL=1000pF and TA=25C, unless otherwise specified. Parameter
Turn-on propagation delay Turn-off propagation delay Turn-on rise time Turn-off fall time Delay matching, HS & LS turn-on/off
Symbol
ton toff tr tf MT VS=0V VS=0V -
Conditions
Min.
100 100 20 -
Typ. Max.
170 200 60 30 300 300 140 80 50
Unit
ns
FAN7842 Rev.1.0.0
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FAN7842 Half Bridge Gate Driver
Typical Performance Characteristics
300
300 275 250 225 200 175 150 125 -40 -20 0 20 40 60 80 100 120
Turn-On Propagation Delay [nsec]
Turn-Off Propagation Delay [nsec]
250
VCC=VBS COM=0V CL=1nF Ta=25C
VCC=VBS=15V COM=0V CL=1nF
High-Side Low-Side
200
High-Side
150
Low-Side
100 10 12 14 16 18 20
Supply Voltage [V]
Temperature [C]
Figure 1.Turn-On Propagation Delay vs. Supply Voltage
Turn-On Propagation Delay [nsec]
300
Figure 4. Turn-Off Propagation Delay vs. Temp.
64
Turn-On Rising Time [nsec]
275 250 225 200 175 150 125 100 75 50 -40
VCC=VBS=15V COM=0V CL=1nF
62 60 58 56 54 52 50 48 46 44 42
VCC=VBS COM=0V CL=1nF Ta=25C
High-Side Low-Side
Low-Side High-Side
-20
0
20
40
60
80
100
120
10
11
12
13
14
15
16
17
18
19
20
Temperature[C]
Supply Voltage [V]
Figure 2. Turn-On Propagation Delay vs. Temp.
Turn-Off Propagation Delay [nsec]
300 280 260 240 220 200 180 160 140 120 100 10 12 14 16 18 20
Figure 5. Turn-On Rising Time vs. Supply Voltage
80 75
Turn-On Rising Time [nsec]
VCC=VBS COM=0V CL=1nF Ta=25C
70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 -40
VCC=VBS=15V COM=0V CL=1nF
High-Side Low-Side
Low-Side High-Side
-20
0
20
40
60
80
100
120
Supply Voltage [V]
Temperature [C]
Figure 3. Turn-Off Propagation Delay vs. Supply Voltage
Figure 6. Turn-On Rising Time vs. Temp.
FAN7842 Rev.1.0.0
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FAN7842 Half Bridge Gate Driver
Typical Performance Characteristics (Continued)
32 30 28 26 24 22 20 18 16 10 11 12 13 14 15 16
Output Sourcing Current [mA]
34
Turn-Off Falling Time [nsec]
VCC=VBS COM=0V CL=1nF Ta=25C
440 420 400 380 360 340 320 300 280
VCC=VBS=15V COM=0V LO=HO=0V
High-Side
High-Side Low-Side
Low-Side
17
18
19
20
-40
-20
0
20
40
60
80
100
120
Supply Voltage [V]
Temperature [C]
Figure 7. Turn-Off Falling Time vs. Supply Voltage
50 45 40 35 30 25 20 15 10 -40 -20 0 20 40 60 80 100 120
Figure 10. Output Sourcing Current vs. Temp.
900
Output Sinking Current [mA]
Turn-Off Falling Time [nsec]
VCC=VBS=15V COM=0V CL=1nF
800
VCC=VBS COM=0V LO=VCC, HO=VB Ta=25C
High-Side
700
Low-Side
600
High-Side
Low-Side
500
400
300 10 12 14 16 18 20
Temperature [C]
Supply Voltage [V]
Figure 8. Turn-Off Falling Time vs. Temp.
600
Figure 11. Output Sinking Current vs. Temp.
850
Output Sourcing Current [mA]
Output Sinking Current [mA]
550 500 450 400 350 300 250 200 150 100 10
VCC=VBS COM=0V LO=HO=0V Ta=25C
800 750 700 650 600 550 500
VCC=VBS=15V COM=0V LO=VCC, HO=VB
High-Side Low-Side
High-Side Low-Side
12
14
16
18
20
-40
-20
0
20
40
60
80
100
120
Supply Voltage [V]
Temperature [C]
Figure 9. Output Sourcing Current vs. Supply Voltage
Figure 12. Output Sinking Current vs. Temp.
FAN7842 Rev.1.0.0
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FAN7842 Half Bridge Gate Driver
Typical Performance Characteristics (Continued)
95
Allowable Negative VS Voltage for Signal Propagatio to High-Side [V]
-4 -6 -8
VCC=VBS COM=0V Ta=25C
90 85 80
VCC=VBS=15V COM=0V HIN=LIN=0V
IQCC [uA]
10 12 14 16 18 20
75 70 65 60 55
-10 -12 -14 -16 -18
50 45 -40 -20 0 20 40 60 80 100 120
Supply Voltage [V]
Temperature [C]
Figure13. Allowable Negative VS Voltage for Signal Propagation to High Side vs. Supply Voltage
Allowable Negative VS Voltage for Signal Propagation to High-Side [V]
-9.0 -9.2 -9.4 -9.6 -9.8 -10.0 -10.2 -10.4 -40 -20 0 20 40 60 80 100 120
80
Figure16. IQCC vs. Temperature
VCC=VBS=15V COM=0V
70 60
VCC=15V COM=0V HIN=LIN=0V Ta=25C
IQBS [uA]
50 40 30 20 10 0 0 5 10 15 20
Temperature [C]
Supply Voltage [V]
Figure14. Allowable Negative VS Voltage for Signal Propagation to High Side vs. Tem.
100
Figure17. IQBS vs. Supply Voltage
52 50 48
80
VBS=15V COM=0V HIN=LIN=0V Ta=25C
VCC=15V COM=0V HIN=LIN=0V
IQBS [uA]
IQCC [uA]
60
46 44 42 40
40
20
38 36
0 0 5 10 15 20
-40
-20
0
20
40
60
80
100
120
Supply Voltage [V]
Temperature [C]
Figure15. IQCC vs. Supply Voltage
Figure18. IQBS vs. Temperature
FAN7842 Rev.1.0.0
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FAN7842 Half Bridge Gate Driver
Typical Performance Characteristics (Continued)
0.7
0.6
VCC=VBS COM=0V HIN=LIN=5V IL=20mA Ta=25C
0.22 0.20 0.18
VCC=VBS=15V COM=0V HIN=LIN=0V IL=20mA
VOH [V]
0.5
VOL [V]
High-Side
0.16
High-Side
0.4
Low-Side
0.14 0.12 0.10
Low-Side
0.3
0.2 10 12 14 16 18 20
-40
-20
0
20
40
60
80
100
120
Supply Voltage [V]
Temperature [C]
Figure 19. High Level Output Voltage vs. Supply Voltage
0.60 0.55 0.50
Figure 22. Low Level Output Voltage vs. Temp.
40
VCC=VBS=15V COM=0V HIN=LIN=5V IL=20mA
35 30
VCC=VBS COM=0V IN=VCC or IN=0V Ta=25C
IN+/IN- [uA]
25 20 15 10 5 0
VOH [V]
0.45
IN+
Low-Side
0.40
High-Side
0.35 0.30 0.25 -40 -20 0 20 40 60 80 100 120
IN0 5 10 15 20
Temperature [C]
Supply Voltage [V]
Figure 20. High Level Output Voltage vs. Temp.
Figure 23. Input Bias Current vs. Supply Voltage
16
0.18 0.17 0.16 0.15 0.14
VCC=VBS COM=0V HIN=LIN=0V IL=20mA Ta=25C
HIN=LIN=5V
14
12
VOL [V]
IN+ [uA]
LIN
10
High-Side Low-Side
HIN
8
0.13 0.12 10 12 14 16 18 20
6
4 -40 -20 0 20 40 60 80 100 120
Supply Voltage [V]
Temperature [C]
Figure 21. Low Level Output Voltage vs. Supply Voltage
Figure 24. Input Bias Current vs. Temp.
FAN7842 Rev.1.0.0
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FAN7842 Half Bridge Gate Driver
Typical Performance Characteristics (Continued)
10.0 9.8
VCCUV+/VCCUV- [V]
9.6 9.4 9.2 9.0 8.8 8.6 8.4 8.2 8.0 -40 -20 0 20 40 60 80 100 120
VCCUV+
VCCUV-
3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
Input Logic Threshold Voltage [V]
VIH(LIN) VIH(HIN) VIL(LIN) VIL(HIN)
VCC=VBS=15V COM=0V
-40
-20
0
20
40
60
80
100
120
Temperature [C]
Temperature [C]
Figure 25. VCC UVLO Threshold Voltage vs. Temp.
10.0 9.8
Figure 28. Input Logic Threshold Voltage vs. Temp.
VBSUV+/VBSUV- [V]
9.6 9.4 9.2 9.0 8.8 8.6 8.4 8.2 8.0 -40 -20 0 20 40 60 80 100 120
VBSUV+
VBSUV-
Temperature [C]
Figure 26. VBS UVLO Threshold Voltage vs. Temp.
5
VB-to-COM =200V
4
ILK [uA]
3
2
1
0 -40 -20 0 20 40 60 80 100 120
Figure 27. VB to COM Leakage Current vs. Temp.
Temperature [C]
FAN7842 Rev.1.0.0
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FAN7842 Half Bridge Gate Driver
Applications Information
100nF 10F 100nF 10F 1 VCC 4 COM 8 VB VS 6 1nF 2 HIN 3 LIN H7 O LO 5 1nF
15Vdc
15Vdc
HIN LIN
50%
50%
LO
HO
10% t off- L ton-H
MT t off- H
ton-L MT
90%
FAN7842
LO
HO
Figure 29. Switching Time Test Circuit
Figure 32. Delay Matching Waveform Definition
HIN LIN
HO LO
Figure 30. Input / Output Timing Diagram
HIN LIN
50%
t on : Turn-on Delay Time t off : Turn-off Delay Time t r : Turn-on Rise Time t f : Turn-off Fall Time tr
50%
t on
to f f
tf
90% HO LO 10%
90% 10%
Figure 31. Switching Time Waveform Definitions
FAN7842 Rev.1.0.0
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FAN7842 Half Bridge Gate Driver
Mechanical Dimensions 8-SOP
Dimemsions in millimeters
FAN7842 Rev. 1.0.0
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FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component is any component of a life 1. Life support devices or systems are devices or support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.
Rev. I17

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