ON FDMF4061 High performance 60v smart power stage module Datasheet

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FDMF4061 – High Performance 60V Smart Power Stage Module
Features
General Description
 Compact size – 6.0 mm x 7.5 mm PQFN
 High current handling: 25A
 Next Generation 60V Power MOSFETs:
The FDMF4061 is a compact 60V Smart Power Stage
(SPS) module that is a fully optimized for use in high current
switching applications. The FDMF4061 module integrates a
driver IC plus two N-channel Power MOSFETs into a thermally
enhanced, 6.0 mm x 7.5 mm PQFN package. The PQFN
packaging provides very low package inductance and
resistance improving the current handling capability and
performance of the part. With an integrated approach, the
complete switching power stage is optimized with regards to
driver and MOSFET dynamic performance, system parasitic
inductance, and Power MOSFET RDS(ON). The FDMF4061 uses
Fairchild's high performance PowerTrenchTM MOSFET
technology, which reduces high voltage and current stresses in
switching applications. The driver IC features a low delay times
and matched PWM input propagation delays, which further
enhance the performance of the part.
 Typ. RDS(on)=2.4(HS) / 2.4(LS) mΩ at VGS=10V, ID=25A
 Wide driver power supply voltage range: 10V to 20V
 Internal pull-down resistors for PWM inputs (HI,LI)
 Short PWM propagation delays
 Under-voltage lockout (UVLO)
 Fully optimized system efficiency
 High performance low profile package
 Integrated 60V Half-Bridge gate driver
 Fairchild 60V PowerTrench® MOSFETs for clean switching
waveforms and reduced ringing
 Low Inductance and low resistance packaging for minimal
Applications
 Motor Drives (Power tools & Drowns etc.)
 Telecom Half / Full - Bridge DC-DC converters
 Buck-Boost Converters
 High-current DC-DC Point of Load (POL) converters.
operating power losses
 Fairchild green packaging and RoHS compliant
 Reduced EMI due to low side flip-chip MOSFET
Application Diagram
RBOOT
CBOOT
DBOOT
VDD
VIN
VDD
HB
PH
VIN
CVIN
HI
LI
MCU
FDMF4061
SW
HO
M
RGH
LG
HO
RGL
HG
VSS
PGND
Ordering Information
Part Number
Current Rating
[A]
Input Voltage
[V]
Frequency Max
[kHz]
Device Marking
FDMF4061
25
60
200
FDMF4061
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
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1
FDM4061 - High Performance 60V Smart Power Stage Module
September 2016
HB
HI
HG
HO
VIN
UVLO
Q1
POWER
MOSFET
(high side)
500k
LEVEL
SHIFT
PH
VDD
UVLO
SW
VDD
Q2
POWER
MOSFET
(low side)
LI
500k
VSS
LO
LG
PGND
Figure 1. Functional Block Diagram
N/C
1
VDD
2
HI
3
LI
4
PGND
5
VSS
6
LG
7
LO
8
LG
9
30
VIN
31
32
VIN
33
N/C
PGND
34
HG
N/C
35
PH
BOOT
36
N/C
HO
Pin Configuration
29
28
27
26
VIN
25
VIN
24
VIN
PGND
37
Top View
16
17
18
19
20
21
SW
15
SW
14
SW
13
SW
SW
12
SW
22
SW
11
SW
PGND
SW
10
SW
PGND
23
PGND
PGND
Figure 2. Pin Configuration (6.0mm x 7.5mm Package)
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
2
FDM4061 - High Performance 60V Smart Power Stage Module
Functional Block Diagram
Pin
Name
Function
1, 29, 32, 34
N/C
No connect
2
VDD
Power supply input for low-side gate drive and bootstrap diode. Bypass this pin to VSS
with a low impedance capacitor.
3
HI
High-side PWM input.
4
LI
Low-side PWM input.
5, 10,11, 22,
23, 33, 37
PGND
Power return for the power stage. Package header, pin 37 and PGND are internally fused
(shorted).
6
VSS
Analog ground for driver IC analog circuits.
7,9
LG
Low-side MOSFET gate.
8
LO
Low-side gate drive output.
12-21
SW
Switching node junction between high-side and Low-side MOSFETs.
24-28
VIN
Power input for the power stage. Bypass this pin to PGND with low impedance capacitor.
30
HG
High-side MOSFET gate.
31
PH
High-side source connection (SW node) for the bootstrap capacitor.
35
HB
Bootstrap supply for high-side driver. Bypass this pin to PH with low impedance capacitor.
36
HO
High-side gate drive output.
Table 1. Pin Definitions
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
3
FDM4061 - High Performance 60V Smart Power Stage Module
Pin Definitions
FDM4061 - High Performance 60V Smart Power Stage Module
Typical Application Diagram
CBOOT
DBOOT
RBOOT
VDD
VIN
VDD
HB
PH
VIN
CVIN
HI
LI
MCU
FDMF4061
SW
HO
M
RGH
HG
LO
RGL
LG
VSS
PGND
Figure 3. Half-Bridge DC Motor
CBOOT1
RBOOT1 DBOOT1
VDD
VIN
VDD
HB
PH
VIN
CVIN1
CVDD1
HI
FDMF4061
LI
SW
HO
RGH1
HG
LO
RGL1
LG
VSS
PGND
MCU
M
CBOOT2
RBOOT1 DBOOT2
VDD
VIN
VDD
HB
PH
VIN
CVDD2
CVIN2
HI
FDMF4061
LI
SW
HO
RGH2
HG
LO
RGL2
LG
VSS
PGND
Figure 4. Full-Bridge DC Motor
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
4
FDM4061 - High Performance 60V Smart Power Stage Module
Typical Application Diagram (Continued)
CBOOT1
RBOOT1 DBOOT1
VDD
VIN
VDD
HB
PH
VIN
CVIN1
CVDD1
HI
FDMF4061
LI
SW
HO
RGH1
HG
LO
RGL1
LG
VSS
PGND
CBOOT2
RBOOT2 DBOOT2
VDD
VIN
VDD
HB
PH
VIN
CVIN2
CVDD2
HI
MCU
FDMF4061
LI
M
SW
HO
RGH2
HG
LO
RGL2
LG
VSS
PGND
CBOOT3
RBOOT3 DBOOT3
VDD
VIN
VDD
HB
PH
VIN
CVDD3
CVIN3
HI
FDMF4061
LI
SW
HO
RGH3
HG
LO
RGL3
LG
VSS
PGND
Figure 5. 3-Phase DC Motor
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
5
FDM4061 - High Performance 60V Smart Power Stage Module
Typical Application Diagram (Continued)
RBOOT
CBOOT
DBOOT
VDD
VIN
VDD
HB
PH
VIN
CVIN
HI
LI
PWM
Controller
FDMF4061
LOUT
SW
HO
COUT
RGH
RLOAD
HG
LO
RGL
LG
VSS
PGND
Figure 6. Buck Converter
CBOOT
DBOOT
RBOOT
VDD
VIN
VDD
HB
PH
VIN
CVIN1
HI
PWM
Controller
HO
Secondary
Side
Circuit
SW
LI
FDMF4061
CVIN2
RGH
HG
LO
RGL
LG
VSS
PGND
Figure 7. Half-Bridge Converter
Typical Application Diagram (Continued)
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
6
VDD
VIN
VDD
HB
PH
VIN
CVIN1
CVDD1
HI
FDMF4061
LI
SW
HO
RGH1
HG
LO
RGL1
LG
PWM
Controller
VSS
PGND
Secondary
Side
Circuit
CBOOT2
RBOOT2 DBOOT2
VDD
VIN
VDD
HB
PH
VIN
CVDD2
CVIN2
HI
FDMF4061
LI
SW
HO
RGH2
HG
LO
RGL2
LG
VSS
PGND
Figure 8. Full-Bridge Converter
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
7
FDM4061 - High Performance 60V Smart Power Stage Module
CBOOT1
RBOOT1 DBOOT1
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at
these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The
“Recommended Operating Conditions” table defines the conditions for actual device operation. Thermal resistance rating is measured under board
mounted and still air conditions.
Symbol
Parameter
Min.
Max.
Unit
VIN
Power Stage Supply Voltage
Referenced to VSS
-0.3
60
V
VPH
PH Voltage
Referenced to VSS
VHB-25
VHB+0.3
V
VDD
Driver Supply Voltage
Referenced to VSS
-0.3
25
V
VHB
Bootstrap to VSS
Referenced to VSS,
-0.3
85
V
VLI, VHI
Gate drive Input signals
Referenced to VSS
-0.3
VDD + 0.3V
V
VHO
High Side driver output
Referenced to PHASE
VPH - 0.3V
VBOOT + 0.3V
V
VLO
Low Side driver output
Referenced to VSS
- 0.3
VDD + 0.3V
V
VHG
High Side MOSFET gate
Referenced to PHASE
-26
28
V
VLG
Low Side MOSFET gate
Referenced to VSS
-26
28
V
(1)
Junction to Ambient Thermal Resistance – Q1
-
17
°C/W
Junction to Ambient Thermal Resistance – Q2(1)
-
15
°C/W
TJ
Junction Temperature
-
150
°C
TSTG
Storage Temperature
-40
150
°C
JA
Table 2. Module Absolute Maximum ratings
(1)
Mounted on a 4-layer FR4 PCB with a dissipating copper surface on the top side of 49 cm2, 2oz.
Recommended Operating Conditions
Symbol
Min
Max
Unit
VIN
Power Stage Supply Voltage
Parameters
Test Condition
3
50
V
VDD
Driver Supply Voltage
10
20
V
-0.3
60
V
6-VDD
60
V
VPH + 10
VPH + 20
V
-
50
V/ns
-40
125
°C
DC
VSW, VPH
SW or PHASE
Repetitive Pulse (< 20ns, 10uJ)
VHB
dVSW/dt
TJ
Voltage on HB
Reference to PH
Voltage Slew Rate on SW
Operating Temperature
Table 3. Module Recommended Operating Conditions
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
8
FDM4061 - High Performance 60V Smart Power Stage Module
Absolute Maximum Ratings
VDD=VHB=15V, VSW =VSS=0V, VIN=30V, TJ= +25°C unless otherwise noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
Supply Currents
IINQ
Power Stage Quiescent Current
LI = HI = 0V
-
-
1
uA
IDDQ
Driver Quiescent Current
LI = HI = 0V
-
67
180
uA
IDDO
VDD operating current
FSW = 20kHz
-
0.3
0.6
mA
FSW = 200kHz
-
2.1
4.2
mA
IHBQ
BOOT Quiescent current
LI = HI = 0V
-
38
120
uA
FSW = 20kHz
-
0.3
0.6
mA
FSW = 200kHz
-
2.4
4.8
mA
IHBO
BOOT Operating current
Under-Voltage Protection
VDDR, VHBR
UVLO rising threshold
VDD or VHB-VPH rising threshold
8.2
9.5
10.0
V
VDDF, VHBF
7.6
8.9
9.6
V
0.6
-
V
-
-
10
us
1.2
-
-
V
UVLO falling threshold
VDD or VHB-VPH falling Threshold
VDDH
UVLO Hysteresis
VDD Hysterisis
tD_POR
POR delay to Enable IC
UVLO rising to internal PWM
enable
Control Inputs (TTL: LI, HI)
VIL
Low Level Input Voltage
VIH
High Level Input Voltage
-
-
2.9
V
VHYS
Input Voltage Hysteresis
VDD = 10V to 20V
-
1.0
-
V
RIN
Input Pull-Down Resistance
-
468
-
k
LI LowHIGH to LO LowHIGH,
VIH to 10% LG
100
153
300
ns
tLPHL
LI HighLow to LO HighLow, VIL
to 90% LG
100
208
300
ns
tHPLH
HI LowHIGH to HO
LowHIGH,VIH to 10% HG-PH
100
170
300
ns
HI HighLow to HO HighLow,
VIL to 90% HG-PH
100
205
300
ns
-
-
50
ns
PWM input (HI,LI)
tLPLH
LI to LO Propagation Delays
HI to HO Propagation Delays
tHPHL
MT
Delay matching, HS and LS turn-on/off
tPW
Minimum Input Pulse Width that
Changes the Output
LI/HI Rising to Vth of Q1,Q2
RG=0
75
ns
LI/HI Falling to Vth of Q1,Q2
RG=0
130
ns
High-Side Driver (HDRV) (VDD = VHB = 15V)
ISOURCE_HO
ISINK_HO
Output Sourcing Peak current
VHO=0V
250
350
Output Sinking Peak current
VHO=15V
-
mA
500
650
-
mA
tR_HG
Rise Time
GH=10% to 90%, RGH=0
-
356
711
ns
tF_HG
Fall Time
GH=90% to 10%, RGH=0
-
151
302
ns
Low-Side Driver (LDRV) (VDD = VHB = 15V)
ISOURCE_LO
ISINK_LO
Output Sourcing Peak current
VLO=0V
250
350
-
mA
Output Sinking Peak current
VLO=15V
500
650
-
mA
tR_LG
Rise Time
GL=10% to 90%, RGL=0
-
346
692
ns
tF_LG
Fall Time
GL=90% to 10%, RGL=0
-
142
283
ns
Table 4. Module Electrical Specifications
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
9
FDM4061 - High Performance 60V Smart Power Stage Module
Electrical Specifications:
TJ= +25°C unless otherwise noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
60
-
-
V
High Side MOSFET, Q1
BVDSS
Drain-Source Breakdown Voltage
IDS=250uA, VGS=0V
IDSS
Zero Gate Voltage Drain Current
VDS=48V, VGS=0V
-
-
1
uA
IGSS
Gate-Source Leakage Current
VDS=0V, VGS=+/-20V
-
-
100
nA
VGS(th)
Gate-Source Threshold Voltage
VDS=VGS , IDS=250uA
2.5
3.7
4.5
V
RDS(ON)
Drain –Source On-Resistance
VGS=10V, IDS=25A
-
2.4
3.2
mΩ
QG
Total Gate Charge
-
56
78
nC
QGS
Gate-Source Charge
-
23
-
nC
-
8
-
nC
VGS=0V to 10V, VDD=30V, IDS=25A
QGD
Gate-Drain “Miller” Charge
QOSS
Total Output Charge
-
65
-
nC
RG
Series Gate Resistance
-
1.0
-
Ω
VHG-VPH=0V, ISD = 2A
-
0.7
1.2
VHG-VPH=0V, ISD = 25A
-
0.8
1.3
-
58
117
ns
-
51
103
nC
-
44
88
ns
-
79
158
nC
60
-
-
V
-
-
1
uA
Drain-Source Diode Characteristics
VSD
Source to Drain Forward Voltage
tRR
Reverse Recovery Time
QRR
Reverse Recovery Charge
tRR
Reverse Recovery Time
QRR
Reverse Recovery Charge
IF = 25A, diF/dt = 100A/us
IF = 25A, diF/dt = 300A/us
V
Low Side MOSFET, Q2
BVDSS
Drain-Source Breakdown Voltage
IDS=250uA, VGS=0V
IDSS
Zero Gate Voltage Drain Current
VDS=48V, VGS=0V
IGSS
Gate-Source Leakage Current
VDS=0V, VGS=+/-20V
-
-
100
nA
VGS(th)
Gate-Source Threshold Voltage
VDS=VGS , IDS=250uA
2.5
3.5
4.5
V
RDS(ON)
Drain –Source On-Resistance
VGS=10V, IDS=25A
-
2.4
3.2
mΩ
QG
Total Gate Charge
-
59
82
nC
QGS
Gate-Source Charge
-
25
-
nC
QGD
Gate-Drain “Miller” Charge
-
11
-
nC
QOSS
Total Output Charge
-
63
-
nC
RG
Series Gate Resistance
-
1.0
-
Ω
VHG-VPH=0V, ISD = 2A
-
0.7
1.2
VHG-VPH=0V, ISD = 25A
-
0.8
1.3
-
57
114
ns
-
52
105
nC
-
43
86
ns
-
81
161
nC
VGS=0V to 10V, VDD=30V, IDS=25A
Drain-Source Diode Characteristics
VSD
Source to Drain Forward Voltage
tRR
Reverse Recovery Time
QRR
Reverse Recovery Charge
tRR
Reverse Recovery Time
QRR
Reverse Recovery Charge
IF = 25A, diF/dt = 100A/us
IF = 25A, diF/dt = 300A/us
V
Table 5. FDMF4061 MOSFET Electrical Specifications
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
10
FDM4061 - High Performance 60V Smart Power Stage Module
Power MOSFET specifications (FDMF4061)
Tj = 25°C unless otherwise noted.
95
100
90
80
VDD=VHB=15V
VSS=0V
VIH=VIL=0V
85
70
80
60
75
IDDQ [μA]
IDDQ [μA]
90
VHB=15V
VSS=0V
VIH=VIL=0V
50
40
70
65
30
60
20
55
10
50
45
0
0
5
10
15
20
-40
-20
0
Supply Voltage [V]
VDD=15V
VSS=0V
VIH=VIL=0V
60
IHBQ [μA]
IHBQ [μA]
70
50
40
30
20
10
0
0
5
10
15
54
52
50
48
46
44
42
40
38
36
34
32
30
28
26
80
100
120
VDD=15V
VSS=0V
VIH=VIL=0V
-40
20
-20
0
20
40
60
80
100
120
Temperature [℃]
Supply Voltage [V]
Figure 11. . IHBQ vs. Supply Voltage(VDD)
Figure 12. IHBQ vs. Temp.
300
300
VDD=VHB
VSS=0V
RG=0Ω
275
250
Turn-On Propagation Delay [ns]
Turn-On Propagation Delay [ns]
60
Figure 10. IDDQ vs. Temp.
100
80
40
Temperature [℃]
Figure 9. IDDQ vs. Supply Voltage(VDD)
90
20
225
200
tHPLH
175
150
tLPLH
125
VDD=VHB=15V
VSS=0V
RG=0Ω
275
250
225
200
tHPLH
175
150
tLPLH
125
100
75
100
50
10
12
14
16
Supply Voltage [V]
18
20
-40
Figure 13. Turn-On Propagation Delay vs. Supply
Voltage(VDD)
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
-20
0
20
40
60
80
Temperature [℃]
100
120
Figure 14. Turn-On Propagation Delay vs. Temp.
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FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics
Tj = 25°C unless otherwise noted.
300
VDD=VHB
VSS=0V
RG=0Ω
275
250
225
Turn-Off Propagation Delay [ns]
Turn-Off Propagation Delay [ns]
300
tHPHL
200
tLPHL
175
150
125
100
VDD=VHB=15V
VSS=0V
RG=0Ω
275
250
tHPHL
225
tLPHL
200
175
150
125
10
12
14
16
18
20
-40
-20
0
20
Supply Voltage [V]
Figure 15. Turn-Off Propagation Delay vs. Supply
Voltage(VDD)
60
80
100
120
Figure 16. Turn-Off Propagation Delay vs. Temp.
400
500
375
Turn-On Rising Time [nsec]
Turn-On Rising Time [nsec]
40
Temperature [℃]
tR_HG
350
tR_LG
325
300
VDD=VHB
VSS=0V
RG=0Ω
275
475
VDD=VHB=15V
VSS=0V
450
RG=0Ω
425
400
375
tR_LG
350
325
tR_HG
300
275
250
250
10
12
14
16
18
-40
20
-20
0
Supply Voltage [V]
20
40
60
80
100
120
Temperature [℃]
Figure 17. Turn-On Rising Time vs. Supply
Voltage(VDD)
Figure 18. Turn-On Rising Time vs. Temp.
200
240
tF_HG
160
Turn-Off Falling Time [ns]
Turn-Off Falling Time [ns]
180
140
tF_LG
120
100
80
60
40
VDD=VHB
VSS=0V
20
RG=0Ω
VDD=VHB=15V
VSS=0V
RG=0Ω
220
200
180
tF_HG
160
tF_LG
140
120
100
0
10
12
14
16
Supply Voltage [V]
18
-40
20
Figure 19. Turn-Off Falling Time vs. Supply
Voltage(VDD)
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
-20
0
20
40
60
80
Temperature [℃]
100
120
Figure 20. Turn-Off Falling Time vs. Temp.
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12
FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Continued)
440
500
480
460
440
420
400
380
360
340
320
300
280
260
240
220
200
180
VDD=VHB
VSS=0V
VHO=VLO=0V
VDD=VHB=15V
VSS=0V
VHO=VLO=0V
420
Output Sourcing Current [mA]
Output Sourcing Current [mA]
Tj = 25°C unless otherwise noted.
ISOURCE_LO
ISOURCE_HO
400
380
360
ISOURCE_LO
340
ISOURCE_HO
320
300
280
260
10
12
14
16
18
-40
20
-20
0
60
80
100
120
Figure 22. Output Sourcing Current vs. Temp.
700
675
650
625
600
575
550
525
500
475
450
425
400
375
350
325
300
800
VDD=VHB=15V
VSS=0V
VLO=VDD,VHO=VHB
750
Output Sinking Current [mA]
Output Sinking Current [mA]
40
Figure 21. Output Sourcing Current vs. Supply
Voltage(VDD)
ISINK_HO
ISINK_LO
VDD=VHB
VSS=0V
VLO=VDD,VHO=VHB
700
650
600
ISINK_HO
550
ISINK_LO
500
450
400
10
12
14
16
Supply Voltage [V]
18
20
-40
-20
0
20
40
60
80
100
120
Temperature [℃]
Figure 23. Output Sinking Current vs. Supply
Voltage(VDD)
Figure 24. Output Sinking Current vs. Temp.
600
600
VDD=VHB
VSS= VPH=0V
VIH=VIL=5V
VOH=VHB - VHO, (VDD - VLO)
IL=20mA
550
525
500
500
475
450
425
VDD=VHB=15V
VSS= VPH=0V
VIH=VIL=5V
VOH=VHB - VHO, (VDD - VLO)
IL=20mA
550
VOH [mV]
575
VOH [mV]
20
Temperature [℃]
Supply Voltage [V]
High-Side
450
High-Side
400
Low-Side
400
350
375
Low-Side
350
300
325
300
250
10
12
14
16
18
20
-40
Supply Voltage [V]
-20
0
20
40
60
80
100
120
Temperature [℃]
Figure 25. High-Level Output Voltage Deviation
Figure 26. High-Level Output Voltage Deviation
from the VBH(VDD) vs. Supply Voltage(VDD)
from the VBH(VDD) vs. Temp.
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
13
FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Continued)
Tj = 25°C unless otherwise noted.
200
230
VDD=VHB
VSS= VPH=0V
VIH=VIL=0V
VOL=VHO - VPH, (VLO - VSS)
IL=20mA
190
180
190
VOL [mV]
VOL [mV]
170
160
High-Side
150
High-Side
150
Low-Side
110
130
120
90
10
12
14
16
Supply Voltage [V]
18
20
-40
-20
0
100
120
Figure 28. Low-Level Output Voltage Deviation
from the VPH(VSS) vs. Supply Voltage(VDD)
from the VPH(VSS) vs. Temp.
10
10
9.8
9.8
VDDR
9.6
9.4
VHBR
9.4
VDD [V]
9.2
VDDF
9
9.2
9
8.8
8.8
8.6
8.6
8.4
8.4
8.2
8.2
8
VHBF
8
-40
-20
0
20
40
60
80
100
120
-40
-20
0
Temperature [℃]
IN+
IN-
5
10
15
20
3.4
3.2
3
2.8
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
60
80
100
120
VIH_HI & VIH_LI
VIL_HI & VIL_LI
-40
Supply Voltage [V]
Figure 31. IN+ IN- vs. Supply Voltage.
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
40
Figure 30. VHB UVLO Threshold Voltage vs. Temp.
Input Logic Threshold Voltage [V]
27
25
23
21
19
17
15
13
11
9
7
5
3
1
-1 0
20
Temperature [℃]
Figure 29. VDD UVLO Threshold Voltage vs. Temp.
IN+/IN- [μA]
20
40
60
80
Temperature [℃]
Figure 27. Low-Level Output Voltage Deviation
9.6
VDD [V]
170
130
Low-Side
140
VDD=VHB=15V
VSS= VPH=0V
VIH=VIL=0V
VOL=VHO - VPH, (VLO - VSS)
IL=20mA
210
-20
0
20
40
60
80
Temperature [℃]
100
120
Figure 32. Input Logic Threshold Voltage vs. Temp.
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14
FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Continued)
Tj = 25°C unless otherwise noted.
45
50
VIN=50V, VDD=10V, 16V VOUT=25V,
35
30
25
20
15
10
50Vi25Vo10Vg
5
50Vi25Vo16Vg
VIN=40V, VDD=10V, 16V VOUT=20V,
Tj≤125’C
45
Tj≤125’C
Module Output Current, IOUT[A]
Module Output Current, IOUT[A]
40
40
35
30
25
20
15
40Vi20Vo10Vg
10
40Vi20Vo16Vg
5
0
0
40
80
120
160
Switching Frequency, FSW[kHz]
200
40
Figure 33. Static SOA, VIN=50V
80
120
160
Switching Frequency, FSW[kHz]
Figure 34. Static SOA, VIN=40V
8.0
10
VIN=50V, VDD=16V VOUT=25V,
FSW=100kHz, IOUT=25A
VIN=50V, VOUT=25V, FSW=100kHz,
IOUT=20A
Module Power Loss, PLMOD[W]
Module Power Loss, PLMOD[W]
200
7.5
7.0
6.5
8
6
4
2
0
6.0
30
60
90
Dead-time [ns]
120
10
150
Figure 35. Module Power Loss vs. TDEAD
12
14
Gate Voltage [V]
16
18
Figure 36. Module Power Loss vs. VGS
50
48
Output Current[A]
46
44
42
40
38
36
VIN=48V, VDD=13V,
TJ=125°C, TA=25°C, PF=0.78
Sine-Triangle Comparison,
DM=1
34
32
30
10
100
Carrier Frequency [kHz]
Figure 37. Output Current Vs. Carrier or Modulation
Frequency
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
15
FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Continued)
Tj = 25°C unless otherwise noted.
180
NORMALIZED
DRAIN TO SOURCE ON-RESISTANCE
150
ID, DRAIN CURRENT (A)
10
PULSE DURATION = 80 s
DUTY CYCLE = 0.5% MAX
VGS = 10 V
120
VGS = 8 V
90
VGS = 6 V
60
30
VGS = 5 V
0
0.0
0.5
1.0
1.5
VDS, DRAIN TO SOURCE VOLTAGE (V)
2.0
6
VGS = 6 V
4
VGS = 8 V
2
VGS = 10 V
0
30
60
90
120
150
180
ID, DRAIN CURRENT (A)
Figure 39. Normalized On-Resistance vs. Drain
Current and Gate Voltage
1.6
50
ID = 25 A
1.5
VGS = 10 V
rDS(on), DRAIN TO
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
-75
-50
-25
0
25
50
75
100
125
SOURCE ON-RESISTANCE (m )
NORMALIZED
DRAIN TO SOURCE ON-RESISTANCE
8
0
Figure 38. On Region Characteristics
150
IS, REVERSE DRAIN CURRENT (A)
VDS = 5 V
120
TJ = 150 oC
TJ = 25 oC
30
TJ = -55
oC
3
4
5
6
7
8
9
10
TJ = 125 oC
10
TJ = 25 oC
6
8
10
180
100
VGS = 0 V
10
1
TJ = 150 oC
0.1
TJ = 25 oC
0.01
TJ = -55 oC
0.2
0.4
0.6
0.8
1.0
1.2
VSD, BODY DIODE FORWARD VOLTAGE (V)
VGS, GATE TO SOURCE VOLTAGE (V)
Figure 42. Transfer Characteristics
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
20
0.001
0.0
0
2
30
Figure 41. On-Resistance vs. Gate to Source Voltage
PULSE DURATION = 80 s
DUTY CYCLE = 0.5% MAX
60
ID = 25 A
VGS, GATE TO SOURCE VOLTAGE (V)
180
90
40
4
Figure 40. Normalized On Resistance vs. Junction
Temperature
150
PULSE DURATION = 80 s
DUTY CYCLE = 0.5% MAX
0
TJ, JUNCTION TEMPERATURE (oC)
ID, DRAIN CURRENT (A)
PULSE DURATION = 80s
DUTY CYCLE = 0.5% MAX
Figure 43. Source to Drain Diode Forward Voltage vs.
Source Current
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16
FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Q1 N-Channel)
Tj = 25°C unless otherwise noted.
10000
VDD = 30 V
ID = 25 A
Ciss
8
VDD = 40 V
VDD = 20 V
6
CAPACITANCE (pF)
VGS, GATE TO SOURCE VOLTAGE (V)
10
4
2
1000
Coss
100
10
Crss
f = 1 MHz
VGS = 0 V
0
0
10
20
30
40
50
1
0.1
60
1
10
60
VDS, DRAIN TO SOURCE VOLTAGE (V)
Qg, GATE CHARGE (nC)
Figure 44. Gate Charge Characteristics
Figure 45. Capacitance vs. Drain to Source Voltage
100
80
ID, DRAIN CURRENT (A)
ID, DRAIN CURRENT (A)
1000
VGS = 10 V
60
40
20
10 us
100
100 us
10
1
1 ms
SINGLE PULSE
TJ = MAX RATED
10 ms
o
RJC = 3.42 C/W
o
RJC = 3.42 C/W
0
25
THIS AREA IS
LIMITED BY rDS(on)
50
o
TC = 25 C
75
100
125
0.1
0.1
150
o
TC, CASE TEMPERATURE ( C)
1
CURVE BENT TO
MEASURED DATA
DC
10
100
VDS, DRAIN to SOURCE VOLTAGE (V)
Figure 47. Forward Bias Safe Operating Area
Figure 46. Maximum Continuous Drain Current vs.
Case Temperature
P(PK), PEAK TRANSIENT POWER (W)
100000
SINGLE PULSE
o
RJC = 3.48 C/W
10000
o
TC = 25 C
1000
100
10
-5
10
-4
10
-3
10
-2
10
-1
10
1
t, PULSE WIDTH (sec)
Figure 48. Single Pulse Maximum Power
Dissipation
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
17
FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Q1 N-Channel)
r(t), NORMALIZED EFFECTIVE TRANSIENT
THERMAL RESISTANCE
Tj = 25°C unless otherwise noted.
2
1
0.1
DUTY CYCLE-DESCENDING ORDER
D = 0.5
0.2
0.1
0.05
0.02
0.01
0.01
SINGLE PULSE
0.001
-5
10
-4
10
-3
-2
10
10
-1
10
1
t, RECTANGULAR PULSE DURATION (sec)
Figure 49. Junction-to-Case Transient Thermal Response Curve
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
18
FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Q1 N-Channel)
Tj = 25°C unless otherwise noted.
20
NORMALIZED
DRAIN TO SOURCE ON-RESISTANCE
ID, DRAIN CURRENT (A)
200
160
VGS = 10 V
120
VGS = 8 V
80
PULSE DURATION = 80 s
DUTY CYCLE = 0.5% MAX
VGS = 6 V
40
0
0.0
0.2
0.4
0.6
0.8
1.0
VGS = 6 V
15
10
5
0
0
100
150
200
Figure 51. Normalized On-Resistance vs. Drain
Current and Gate Voltage
50
ID = 25 A
1.7
VGS = 10 V
rDS(on), DRAIN TO
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
SOURCE ON-RESISTANCE (m )
1.8
NORMALIZED
DRAIN TO SOURCE ON-RESISTANCE
50
ID, DRAIN CURRENT (A)
Figure 50. On-Region Characteristics
40
30
20
10
TJ = 125 oC
0.8
0.7
-75
TJ = 25 oC
0
-50
-25
0
25
50
75
4
100 125 150
IS, REVERSE DRAIN CURRENT (A)
PULSE DURATION = 80 s
DUTY CYCLE = 0.5% MAX
160
VDS = 5 V
120
oC
80
TJ = 25 oC
40
TJ = -55 oC
6
7
8
9
7
8
9
10
VGS = 0 V
10
1
TJ = 150 oC
TJ = 25 oC
0.1
0.01
TJ = -55 oC
0.2
0.4
0.6
0.8
1.0
1.2
VSD, BODY DIODE FORWARD VOLTAGE (V)
VGS, GATE TO SOURCE VOLTAGE (V)
Figure 54. Transfer Characteristics
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
200
100
0.001
0.0
0
5
6
Figure 53. On-Resistance vs. Gate to Source Voltage
200
4
5
VGS, GATE TO SOURCE VOLTAGE (V)
Figure 52. Normalized On Resistance vs. Junction
Temperature
TJ = 150
PULSE DURATION = 80 s
DUTY CYCLE = 0.5% MAX
ID = 25 A
TJ, JUNCTION TEMPERATURE (oC)
ID, DRAIN CURRENT (A)
VGS = 10 V
VGS = 8 V
VDS, DRAIN TO SOURCE VOLTAGE (V)
3
PULSE DURATION = 80s
DUTY CYCLE = 0.5% MAX
Figure 55. Source to Drain Diode Forward Voltage vs.
Source Current
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FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Q2 N-Channel)
Tj = 25°C unless otherwise noted.
10000
VDD = 30 V
ID = 25 A
Ciss
8
CAPACITANCE (pF)
VGS, GATE TO SOURCE VOLTAGE (V)
10
VDD = 40 V
VDD = 20 V
6
4
2
0
0
12
24
36
48
1000
Coss
100
1
10
60
VDS, DRAIN TO SOURCE VOLTAGE (V)
Figure 56. Gate Charge Characteristics
Figure 57. Capacitance vs. Drain to Source Voltage
1000
100
80
ID, DRAIN CURRENT (A)
ID, DRAIN CURRENT (A)
f = 1 MHz
VGS = 0 V
1
0.1
60
Qg, GATE CHARGE (nC)
VGS = 10 V
60
40
20
100
10
1
10 us
THIS AREA IS
LIMITED BY rDS(on)
100 us
SINGLE PULSE
TJ = MAX RATED
1 ms
10 ms
o
RJC = 3.48 C/W
o
RJC = 3.48 C/W
0
25
Crss
10
50
o
TC = 25 C
75
100
125
0.1
0.1
150
o
1
CURVE BENT TO
MEASURED DATA
DC
10
100
VDS, DRAIN to SOURCE VOLTAGE (V)
TC, CASE TEMPERATURE ( C)
Figure 59. Forward Bias Safe Operating Area
Figure 58. Maximum Continuous Drain Current vs.
Case Temperature
P(PK), PEAK TRANSIENT POWER (W)
100000
SINGLE PULSE
o
RJC = 3.48 C/W
10000
o
TC = 25 C
1000
100
10
-5
10
-4
10
-3
10
-2
10
-1
10
1
t, PULSE WIDTH (sec)
Figure 60. Single Pulse Maximum Power Dissipation
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
20
FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Q2 N-Channel)
r(t), NORMALIZED EFFECTIVE TRANSIENT
THERMAL RESISTANCE
Tj = 25°C unless otherwise noted.
2
1
0.1
DUTY CYCLE-DESCENDING ORDER
D = 0.5
0.2
0.1
0.05
0.02
0.01
0.01
SINGLE PULSE
0.001
-5
10
-4
10
-3
-2
10
10
-1
10
1
t, RECTANGULAR PULSE DURATION (sec)
Figure 61. Junction-to-Case Transient Thermal Response Curve
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
21
FDMF4061 - High Performance 60V Smart Power Stage Module
Typical Performance Characteristics (Q2 N-Channel)
Driver Output State (HO/LO)
The FDMF4061 is a non-inverting 60V halfbridge Smart Power Stage (SPS) module. The
module packages a driver IC die along with
pair of equally sized (matched R DSON) 60V
TM
PowerTrench
N-Channel
MOSFETs
(Standard gate thresholds refer to Table 5).
The FDMF4061 module provides separate
power input pins; the power stage input (VIN)
and the gate driver input (VDD). The power
stage input (VIN) accepts a wide operating
from 3V to 50V, while the gate driver input
(VDD) requires 10V to 20V. The module
accepts TTL compatible inputs (HI/LI) along
with anti-cross conduction circuitry to protect
against over-lapping PWM (HI/LI) pulses. The
module (driver IC) also implements UVLO
circuitry in both the VDD-VSS and BOOT-PH
power domains.
Disabled
7.6
10.0
VDD-VSS, BOOT-PH
(Volts)
Figure 62. Min/Max UVLO thresholds
PWM Input Stage
The FDMF4061 incorporates a PWM input
gate drive design, where the low side drive
output (LO) and high side drive output (HO)
are controlled through independent PWM
inputs (LI and HI, respectively).
Power-Up and UVLO Operation
UVLO circuits are implemented in both the
VDD-VSS and HB-PH power domains. During
power-up, the VDD-VSS UVLO circuit forces
HO and LO low until the VDD supply voltage
exceeds the UVLO rising threshold (9.2V typ.).
The module (driver IC) will begin responding
to PWM pulses once VDD exceeds the UVLO
threshold. The UVLO circuit does contain
hysteresis (~0.6V) to prevent noise from
interfering with normal operation. An additional
UVLO circuit is implemented on the HB-PH
pins which will hold HO low until HB-PH >
(9.2V typ.). The HB-PH UVLO also
incorporates hysteresis (~0.6V).
VDD BOOT
UVLO UVLO
Enabled
The module (driver IC) can be used with TTL
compatible input signals. The input signals
can also be driven with voltage levels that are
lower than the VDD supply level. The VDD
supply level does NOT affect the input
threshold levels (VIH and VIL).
VIH
VIL
Driver State
0
X
Disabled (GH, GL=0)
1
0
GL follows PWM , GH=0)
1
1
Enabled (GH/GL follow PWM)
HI / LI
HG / LG
Table 6. UVLO Truth Table
Figure 63. PWM threshold definitions
- VIH = PWM trip level to flip state from LOW to
HIGH.
- VIL = PWM trip level to flip state from HIGH to
LOW.
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
22
FDMF4061 - High Performance 60V Smart Power Stage Module
Functional Description
The driver IC output stage is designed to drive
a pair of N-channel MOSFETs. The driver
outputs (LO, HO) are non-inverting and will
follow the PWM input commands (LI, HI
respectively). The LO and HO outputs are
capable of sinking and sourcing up to
0.65/0.35A peak current respectively.
Timing Diagram
tHPHL
HI
90%
tHPLH
tR_GH
HO
tF_GH
10%
tLPHL
LI
tLPLH
90%
tR_GL
LO
tF_GL
10%
SW
Figure 64. PWM Timing Diagram (LI / HI signals)
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
23
FDMF4061 - High Performance 60V Smart Power Stage Module
The driver output stage is also capable of
providing a rail (VDD) to rail (VSS) output
voltage level when driving the Power
MOSFETs. Depending on the end application,
the output voltage level can be set to aide in
optimizing MOSFET and driver IC power
losses. The driver output voltage level can
also be used to help adjust SW node edge
rates.
Driver Output Stage
The FDMF4061 is designed as a non-inverting
power stage, where the Power MOSFET
response (SW node) is designed to follow to
HI/LI commands. The device is well-suited to
be used in a wide variety of applications, such
as: Half and Full-Bridge DC-DC converters,
Active Clamp Forward converters, rectifier
circuits, and motor drive power stages.
However, various applications and topologies
can place unique stresses on the module.
There are a few basic power-stage
requirements needed to ensure proper
operation.
H-bridge Motor Drive
In this operating mode, it allows bi-directional
current flow through motor by enabling diagonal
MOSFETs to make current flow in one or the
other direction. Inductor current will not tolerate
abrupt changes either when charged or
discharged and alternate path is required to
protect switches during dead-time. The path can
be made either MOSFET body-diode conducting
as soon as switches are disabled or enabling
opposite high-side or low-side switch to carry the
recirculation current while avoiding shootthrough. Utilizing MOSFET channel is often
much more efficient way to handle the decaying
current due to lower conduction power loss than
body-diode forward drop loss.
As previously mentioned, the FDMF4061 is a
multi-chip module (MCM). The module
consists of three die (HS MOSFET, LS
MOSFET and driver IC). Each die dissipates
heat in normal operation resulting from power
loss. The power MOSFETs can generate
power loss from conduction and switching
losses while the driver IC dissipated loss from
bias, boot diode conduction and from the
driver output stage sinking and sourcing power
MOSFET gate currents and operating
frequency. The amount of heat dissipated by
any die is largely dependent on the operating
conditions. The close physical placement of
the three die inside of the package translates
into strong thermal coupling between die.
Ideally, a thermal camera should be used to
monitor the FDMF4061 during the engineering
development phase. This can help ensure the
module operates within the absolute maximum
ratings specified in this datasheet.
FDMF4061
VIN
Q1
Q1
SW
SW
Q2
Q2
PGND
Figure 65. H-bridge motor drive
FDMF4061 Power Dissipation
The maximum motor drive current can be
obtained from estimating total power dissipation
of motor driver. There are a number of factors
which limit actual current level such as motor
ratting, driver IC, PCB construction, ambient
temperature and given application. All of power
dissipation components must be considered to
get reliable operation at the specific application.
There is obvious power dissipations listed below
in single H-bridge motor application.
Operating Modes
The FDMF4061 can reliably operate while
driving various load impedances. However,
the relatively large number of applications can
result in the module operating in various
modes. Common applications such as
switching power converters and motor drives
can place the FDMF4061 into different
operating modes.
The various operating
modes will change the response of the
MOSFET voltage and current stresses and
power losses as well as the gate driver dead
time response. A few operating modes are
listed below.
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
Forward drive
Reverse drive
Dead-Time(body-conduction)
FDMF4061
Module Power Dissipation
•
Conduction loss – Generally biggest
power loss which is dissipated due to the
RDSON and its temperature coefficient
must be considered in the calculation
PCOND  (rDS(ON) -HS_temp  rDS(ON) -LS_temp )  IOUT
2
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24
FDMF4061 - High Performance 60V Smart Power Stage Module
Application Information:
Switching losses - Rising and falling time
by parasitic inductance can be
measured in the application, listed below
assumed zero inductance.
Continuous current flowing out of
SW node.
Continuous current flowing out of the module
SW node is typical of a heavily loaded switchedmode power stage that is operating in a
synchronous buck converter topology. In this
mode, the power stage is supplying current from
VIN into an inductive load. Figure 66 shows and
example of a synchronous buck convert
operating in CCM with positive inductor current.
Switching OFF loss
PSW(OFF)  (
VIN  I DS(OFF)  t OFF
2
)  FSW
where :
t OFF  (Q GS2  Q GD )/i G(OFF) ;
i G(OFF)  VPLATEAU /(R GH  R DRV_OFF)
Switching ON loss
PSW(ON)  (
VIN  I DS(ON)  t ON
2
RBOOT
HB
where :
PH
VIN
VIN
VDD
t ON  (Q GS2  Q GD )/i G(ON) ;
CVIN
VDD
Q1
i G(ON)  VPLATEAU /(R G  R DRV_ON)
PWM
Controller
Gate drive loss
PGATE  QG  VDRV  FSW
HI
LI
FDMF4061
IL
Qoss  Output Charge
•
CBOOT
DBOOT
Qoss  VIN

)  FSW
2
SW
VOUT
LFILTER
COUT
Q2
RLOAD
PGND
HO
RGH
Quiescent current power loss – Current
is still drawn from the VDD and HB pins
for internal and level shifting circuitry
without load (RG=Open). Power loss by
quiescent current is
LO
RGL
LG
VSS
0A
time
Figure 66. Synchronous Buck Operating
in CCM with positive inductor current
PQuiescent  VDD  I DDQ  VHB  I HBQ
•
HG
IL (A)
•
VOUT
Supply current power loss(RG=0Ω) is
During this operating mode, the HS MOSFET
(Q1) will undergo hard-switched inductive
turn-on and turn-off events, while LS MOSFET
(Q2) will undergo soft switching and body
diode recovery. Hard-switching often results in
large switching spikes on Q1 and Q2 V DS as
well as PH to VSS and BOOT to VSS pins.
Peak switching spikes are often positively
correlated to load current.
Psupply  VDD  I DDO  VHB  I HBO
•
Total power loss in the FDMF4061 is
equal to the power dissipation caused by
gate driver and Power MOSFETs,
Ptotal  PCond  PSW  PGate  Psupply
Once the designer estimates power dissipation
in the gate driver and MOSFETs, junction
temperature can be calculated using thermal
resistance (JA) and ambient temperature as
followings and also can calculate maximum
allowable motor current:
Continuous current flowing into
SW node.
Tj  TA  (JA  Ptotal )
Continuous current flowing into the module
SW node is typical of a heavily loaded
switched-mode power stage that is operating
in a synchronous boost converter topology.
Continuous inductor current flowing in to the
module SW node is typical operation of a
synchronous boost converter, as shown in
Figure 67.
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
25
FDMF4061 - High Performance 60V Smart Power Stage Module
•
DBOOT
HB
PH
VIN
(pin)
VIN
Q1
Q1
HI
Input from
controller
RLOAD
LI
LFILTER
DGH_OFF
CIN
LO
RGL_OFF
RGH
DGL_OFF
IL (A)
HG
LO
PGND
HG
PGND
HO
RLOAD
COUT
Q2
RGH_ON
RGH_OFF
VIN
Q2
VOUT
LFILTER
RGL_ON
FDMF4061
SW
SW
HO
IL
VOUT
CVIN
VDD
VOUT
COUT
VDD
LI
VIN
IL
VDD
HI
PH
VDD
CBOOT
DBOOT
HB
PWM
Controller
CBOOT
FDMF4061
RBOOT
RBOOT
LG
VSS
RGL
LG
VSS
0A
time
Figure 68. Gate drive resistor-diode
circuit
Figure 67. Synchronous Boost Converter
operating in CCM
From a module perspective, the main
difference here versus the previous (buck)
operating mode is that this situation will cause
the LS FET (Q2) to act as the control
MOSFET and hard switch while the HS FET
(Q1) acts as a synchronous rectifier and
undergoes soft switching with body diode
recovery. This type of operation can drastically
change power losses dissipated in Q1 and Q2
versus buck operating mode.
CGD x dVDS/dt turn-on
CGD x dVDS/dt turn-on is a false (unwanted)
turn-on event that often creates a brief and
uncontrolled shoot through current between
the HS (Q1) and LS (Q2) MOSFETs.
Typically, a C GD x dVDS/dt “shoot-through”
condition arises from capacitive feedback
current flowing through CGD into C GS inducing
a gate-bounce-induced channel turn-on of the
MOSFET. Holding the gate below threshold
can become challenging because the highfrequency capacitive displacement current
from C GD (due to dV DS/dt) couples back to
circuit ground through the gate electrode.
dVDS/dt control using external
gate resistors
The FDMF4061 also provides module pins for
placing external gate resistors. The module
provides pins for the HO and LO signals
(driver output signals) and the HG and LG
(Power MOSFET gate pins). Resistors can be
placed in series with the MOSFET gate to
control the SW node edge rates.
Ld_LS
RDRIVE_LS
Independently controlling MOSFET (slower)
turn-on and (faster) turn-off slew rates can
also be accomplished by using the resistor
and diode circuit shown in Figure 68.
LG_brd
CGD
LG_pack RG
Q2
CGS
ZGate_Drv ~ R + L
ZMOS_Gate ~ 1/C
Ls_LS
Figure 69. CGD x dVDS/dt current flow
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
26
FDMF4061 - High Performance 60V Smart Power Stage Module
However, similar operation can arise when a
switching converter (such as a synchronous
buck) is pulling energy from the output filter
capacitors and delivering the energy back to
the input filter capacitors.
FDMF4061 - High Performance 60V Smart Power Stage Module
The gate-to-ground impedance is the parallel
combination of the gate drive (Z G_DRV) and the
MOSFET gate-to-source (Z MOS_Gate) paths. As
dVDS/dt increases, the more favorable path for
displacement current is through the capacitive
gate-source (CGS) path versus the highly
inductive and resistive gate drive loop. So
impedence through gate driver should be
minimized. The severity of the shoot through
current is difficult to predict.
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
27
FDMF4061 - High Performance 60V Smart Power Stage Module
Physical Dimensions
Figure 70. Clip Bond PQFN 6.0mm x 7.5mm Package Dimensions
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2016 Fairchild Semiconductor Corporation
FDMF4061 Rev.1.0
www.fairchildsemi.com
28
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