85V Half Bridge MOSFET Drivers
with 5.5V to 16V Gate Drive
MIC4604 Evaluation Board
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.
The MIC4604YM Evaluation Board comes with the
MIC4604YM SOIC package, while the MIC4604YMT
Evaluation Board comes with the MIC4604YMT TDFN
package.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Requirements
At a minimum, the evaluation board requires a 5.5V to 16V
power supply to power the VDD terminal (J1) of the
MIC4604 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.
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.
Because there is no non-overlap protection, always ensure
that the HI/LI inputs are connected to non-overlapping
clock signals as shown in Figures 1, 2, 3, and 4. If both HI
and LI are ON at the same time, then HO and LO will be
high at the same time and turn ON both the MOSFETs,
thus shorting the VIN supply to GND.
Getting Started
1. Connect V
IN
supply between the VIN and GND
terminals and V
DD
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 (V
IN
≤ 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 ≤V
DD
< 16V). Do not
apply power until Step 5.
2.
Connect the TTL-compatible HI and LI inputs.
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.
3. Monitor inputs and outputs.
Monitor the inputs HI (JP2) and LI (JP3) 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 MIC4604 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 V
IN
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 V
IN
power supply followed by the V
DD
power supply. Turn on the HI and LI inputs.
Ordering Information
Part Number
MIC4604YM EV
MIC4604YMT EV
Description
85V Half Bridge Driver Evaluation
Board with MIC4604YM device.
85V Half Bridge Driver Evaluation
Board with MIC4604YMT device.
Micrel Inc. • 2180 Fortune Drive •
San
Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
September 11, 2013
Revision 1.0
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