MIC4605 Evaluation Board
85V Half-Bridge MOSFET Drivers
with Adaptive Dead Time and
Shoot-Through Protection
General Description
The MIC4605 is an 85V half-bridge MOSFET driver that
features adaptive-dead-time and shoot-through protection.
The adaptive-dead-time circuitry actively monitors the half-
bridge outputs to minimize the time between high-side and
low-side MOSFET transitions, thus maximizing power
efficiency. Anti-shoot-through circuitry prevents erroneous
inputs and noise from turning both MOSFETs on at the
same time. Additionally, the MIC4605’s adjustable gate
drive sets the gate drive voltage to VDD for optimal
MOSFET R
DS(ON)
, which minimizes power loss due to the
MOSFET’s R
DS(ON)
.
Requirements
At a minimum, the evaluation board requires a 5.5V to 16V
power supply to power the VDD terminal (J1) of the
MIC4605 and another supply (up to 85V) may be used to
power the MOSFETs connected to the VIN terminal (J2). A
pulse generator or the output of a PWM control IC may be
connected to the HI and LI terminals (−1), or PWM single
input (−2).
Precautions
There is no reverse input protection on this board. When
connecting the input sources, make sure that the correct
polarity is observed.
Under extreme load conditions and with a high supply
voltage (>48V) connected to the VIN terminal (J2), input
transients can be quite large if long test leads are used. In
such cases a 100µF, 100V electrolytic capacitor is needed
across the VIN terminals to prevent overvoltage damage to
the IC. This can be removed if a clean supply voltage on
VIN is always guaranteed.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Getting Started
1. Connect VIN supply between the VIN and GND
terminals and VDD supply between the VDD and
GND terminals.
Connect a supply between the VIN terminal (J2) and
the GND terminal (J3), paying careful attention to
polarity and supply range (VIN ≤ 85V). Do not apply
power until Step 5.
Connect a supply between the VDD terminal (J1) and
the GND terminal (J3), paying careful attention to
polarity and supply range (5.5V ≤ VDD < 16V). Do not
apply power until Step 5.
2. Connect the TTL-compatible HI and LI inputs (−1),
or the PWM single input (−2).
Connect the HI input (JP2) and LI input (JP3) to a
pulse generator or the output of a PWM control IC.
Ensure that they are non-overlapping signals and are
TTL compatible logic-levels. The PWM single input
replaces the HI input (JP2) for the
−2
option.
3. Monitor inputs and outputs.
Monitor the inputs HI (JP2) and LI (JP3) or PWM (JP2)
and outputs HO (JP1) and LO (JP4) with an
oscilloscope.
4. Connect motor across HS and GND or connect HS
to GND.
The simplest way to observe the MIC4605 operation is
to connect a motor across the HS terminal (J8) and
GND (J9). Alternatively the HS terminal (J8) can be
shorted to GND (J9) with the VIN supply turned OFF.
DC and AC parameters can be easily measured in this
configuration.
5. Turn-on supplies and HI/LI inputs.
Turn-on the VDD power supply, followed by the VIN
power supply. Turn on the HI and LI inputs (−1) or
PWM single input (−2).
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
November 18, 2013
Revision 1.0
Micrel, Inc.
MIC4605 Evaluation Board
Evaluation Board Schematic (MIC4605YM)
Bill of Materials
Item
C1
Part Number
C1608X7R1E105K
GRM188R71E105KA12D
C1608X7R1E104K
C2
06033C104KAT2A
GRM188R71E104KA01D
C3
B41851-A9107-M008
CGA5L2X7R2A105K
C4
12061C105K4Z4A
GRF31CR72A105KA01L
Q1, Q3
U1
Notes:
1. TDK:
www.tdk.com.
2. Murata:
www.murata.com.
3. AVX:
www.avx.com.
4. Analog Power:
www.analogpowerinc.com.
5. Micrel, Inc.:
www.micrel.com.
Manufacturer
TDK
(1)
(2)
Description
1.0µF Ceramic Capacitor, 25V, X7R, Size 0603
Qty.
1
Murata
TDK
AVX
(3)
0.1µF Ceramic Capacitor, 25V, X7R, Size 0603
1
Murata
TDK
TDK
AVX
Murata
Analog Power
Vishay
Micrel, Inc.
(5)
(4)
100µF, 100V, Radial Electrolytic Capacitor
1
1.0µF Ceramic Capacitor, 100V, X7R, Size 1206
1
AM7414NA
SiR698DP-T1-GE3
MIC4605YM
100V , N-Channel MOSFET , SO8
85V Half-Bridge MOSFET Drivers with 5.5V to 16V
Gate Drive
2
1
November 18, 2013
3
Revision 1.0
Micrel, Inc.
MIC4605 Evaluation Board
Evaluation Board Schematic (MIC4605YMT)
Bill of Materials
Item
C1
Part Number
C1608X7R1E105K
GRM188R71E105KA12D
C1608X7R1E104K
C2
06033C104KAT2A
GRM188R71E104KA01D
C3
B41851-A9107-M008
CGA5L2X7R2A105K
C4
12061C105K4Z4A
GRF31CR72A105KA01L
Q1, Q3
U1
Notes:
6. TDK:
www.tdk.com.
7. Murata:
www.murata.com.
8. AVX:
www.avx.com.
9. Analog Power:
www.analogpowerinc.com.
10. Micrel, Inc.:
www.micrel.com.
Manufacturer
TDK
(6)
(7)
Description
1.0µF Ceramic Capacitor, 25V, X7R, Size 0603
Qty.
1
Murata
TDK
AVX
(8)
0.1µF Ceramic Capacitor, 25V, X7R, Size 0603
1
Murata
TDK
TDK
AVX
Murata
Analog Power
Vishay
Micrel, Inc.
(10)
(9)
100µF, 100V, Radial Electrolytic Capacitor
1
1.0µF Ceramic Capacitor, 100V, X7R, Size 1206
1
AM7414NA
SiR698DP-T1-GE3
MIC4605YMT
100V , N-Channel MOSFET , SO8
85V Half-Bridge MOSFET Drivers with 5.5V to 16V
Gate Drive
2
1
November 18, 2013
5
Revision 1.0
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