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PDF MIC4604 Data sheet ( Hoja de datos )
| Número de pieza | MIC4604 | |
| Descripción | 85V Half Bridge MOSFET Drivers | |
| Fabricantes | Micrel Semiconductor | |
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MIC4604
85V Half Bridge MOSFET Drivers with up to
16V Programmable Gate Drive
General Description
The MIC4604 is an 85V Half Bridge MOSFET driver. The
MIC4604 features fast 39ns propagation delay times and
20ns driver rise/fall times for a 1nF capacitive load. The
low-side and high-side gate drivers are independently
controlled. The MIC4604 has TTL input thresholds. It
includes a high-voltage internal diode that helps charge
the high-side gate drive bootstrap capacitor.
A robust, high-speed, and low-power level shifter provides
clean level transitions to the high-side output. The robust
operation of the MIC4604 ensures that the outputs are not
affected by supply glitches, HS ringing below ground, or
HS slewing with high-speed voltage transitions.
Undervoltage protection is provided on both the low-side
and high-side drivers.
The MIC4604 is available in an 8-pin SOIC package and a
tiny 10-pin 2.5mm × 2.5mm TDFN package. Both
packages have an operating junction temperature range of
–40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• 5.5V to 16V gate drive supply voltage range.
• Drives high-side and low-side N-Channel MOSFETs
with independent inputs
• TTL input thresholds
• On chip bootstrap diode
• Fast 39ns propagation times
• Drives 1000pF load with 20ns rise and fall times
• Low power consumption
• Supplies undervoltage protection
• –40°C to +125°C junction temperature range
Applications
• Power inverters
• High-voltage step-down regulators
• Half, full and 3-phase bridge motor drives
• Distributed power systems
• Computing peripherals
Typical Application
Motor Door Lock Solution
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 25, 2013
Revision 1.0
1 page  
Micrel, Inc.
Timing Diagrams
Note:
6. All propagation delays are measured from the 50% voltage level.
Block Diagram
MIC4604
June 25, 2013
Figure 1. MIC4604 Block Diagram
5
Revision 1.0
5 Page 
Micrel, Inc.
MIC4604
Rg is the series resistor (if any) between the driver IC and
the MOSFET. Rg_fet is the gate resistance of the
MOSFET. Rg_fet is usually listed in the power MOSFET’s
specifications. The ESR of capacitor CB and the resistance
of the connecting etch can be ignored since they are much
less than Ron and Rg_fet.
The effective capacitances of Cgd and Cgs are difficult to
calculate because they vary non-linearly with Id, Vgs, and
Vds. Fortunately, most power MOSFET specifications
include a typical graph of total gate charge versus Vgs.
Figure 7 shows a typical gate charge curve for an arbitrary
power MOSFET. This chart shows that for a gate voltage
of 10V, the MOSFET requires about 23.5nC of charge.
The energy dissipated by the resistive components of the
gate drive circuit during turn-on is calculated as:
E
=
1
2
× Ciss × Vgs 2
but
Q = C×V
so
E = 1/2 × Qg × Vgs
Where
Ciss = total gate capacitance of the MOSFET
Gate Charge
10
VDS = 50V
8 ID = 6.9A
Eq. 6
6
4
2
0
0 5 10 15 20 25
Qg - Total Gate Charge (nC)
Figure 7. Typical Gate Charge vs. VGS
The same energy is dissipated by Roff, Rg and Rg_fet
when the driver IC turns the MOSFET off. Assuming Ron
is approximately equal to Roff, the total energy and power
dissipated by the resistive drive elements is:
Edriver = Qg × Vgs
and
Pdriver = Qg × Vgs × fs
Eq. 7
Where:
Edriver = energy dissipated per switching cycle
Pdriver = power dissipated per switching cycle
Qg = total gate charge at Vgs
Vgs = gate to source voltage on the MOSFET
fs = switching frequency of the gate drive circuit
The power dissipated inside the MIC4604 is equal to the
ratio of Ron and Roff to the external resistive losses in Rg
and Rg_fet. Letting Ron = Roff, the power dissipated in the
MIC4604 due to driving the external MOSFET is:
Pdiss drive
= Pdriver
Ron
Ron + Rg + Rg _ fet
Eq. 8
Supply Current Power Dissipation
Power is dissipated in the MIC4604 even if nothing is
being driven. The supply current is drawn by the bias for
the internal circuitry, the level shifting circuitry, and shoot-
through current in the output drivers. The supply current is
proportional to operating frequency and the VDD and VHB
voltages. The typical characteristic graphs show how
supply current varies with switching frequency and supply
voltage.
The power dissipated by the MIC4604 due to supply
current is
Pdiss sup ply = VDD × IDD + VHB × IHB
Eq. 9
Total Power Dissipation and Thermal Considerations
Total power dissipation in the MIC4604 is equal to the
power dissipation caused by driving the external
MOSFETs, the supply current and the internal bootstrap
diode.
Pdiss total = Pdisssupply + Pdissdrive + Pdiode total Eq. 10
June 25, 2013
11
Revision 1.0
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MIC4604.PDF ] | |
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