OMNIREL OM9369 Datasheet

FULL-FEA TURED POWER MODULE FOR HIGH-VOLT AGE

205 Crawford Street, Leominster, MA 01 453 USA [phone] FAX [phone]
Visit Our Web Site at www.omnirel.com

DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTORS

25 Amp. Push-Pull 3-Phase Brushless
DC Motor Controller/Driver Module
in a Power Flatpack

FEATURES

• Fully integrated 3-Phase Brushless DC Motor Control Subsystem
includes power stage, non-isolated driver stage, and controller stage

• Rugged IGBT Power Output Stage with Soft Recovery Diode

• 25AAverage Phase Current with 300V Maximum Bus Voltage

• Internal Precision Current Sense Resistor (6W max. dissipation)

• Speed and Direction Control of Motor

• Brake Input for Dynamic Braking of Motor

• Overvoltage/Coast Input for Shutdown of All Power Switches

• Soft Start for Safe Motor Starting

• Unique Hermetic or Plastic Ring Frame Power Flatpacks

• Hermetic (3.10" x 2.10" x 0.385")

• Plastic Ring Frame (4.13" x 2.00" x 0.49")

OM9369

APPLICATIONS

• Fans and Pumps

• Hoists

• Actuator Systems

DESCRIPTION

The OM9369 is one of a series of versatile, integrated three-phase brushless DC motor
controller/driver subsystems housed in a 43 pin power flatpack. The OM9369 is best used as a two
quadrant speed controller for controlling/driving fans, pumps, and motors in applications which require
small size. Typical size brushless DC motors that the OM9369 can effectively control range from
fractional HP up to several HP. The OM9369 is ideal for use on DC distribution busses up to and
including 270Vdc. Many integral control features provide the user much flexibility in adapting the
OM9369 to specific system requirements.

The small size of the complete subsystem is ideal for aerospace, military, and high-end industrial
applications. Two package types provide a broad range of cost and screening options to fit any
application.

8 10 R2
Supersedes 6 11 R1

OM9369

SIMPLIFIED BLOCK DIAGRAM

COMMUTATION TRUTH TABLE

This table shows the Phase Output state versus
the state of the Hall-Effect and Direction Inputs.
Please note that the OM9369 Hall-Effect Inputs
are Grey-encoded; that is, only one input is
allowed to change from one input state to
another at a time.

The commutation coding shown reflects Hall­Effect sensors that are spaced at 120°
mechanical increments. Also, internal
protection logic disables all three Phase
Outputs when the Hall-Effect Inputs are set to
an illegal condition (i.e. all logic low or all logic
high).

DIGITAL INPUTS PHASE OUTPUTS

Dir H1 H2 H3 A B C

1 0 0 1 Hi-Z Sink Source
1 0 1 1 Sink Hi-Z Source
1 0 1 0 Sink Source Hi-Z
1 1 1 0 Hi-Z Source Sink
1 1 0 0 Source Hi-Z Sink
1 1 0 1 Source Sink Hi-Z
0 1 0 1 Sink Source Hi-Z
0 1 0 0 Sink Hi-Z Source
0 1 1 0 Hi-Z Sink Source
0 0 1 0 Source Sink Hi-Z
0 0 1 1 Source Hi-Z Sink
0 0 0 1 Hi-Z Source Sink
X 0 0 0 Hi-Z Hi-Z Hi-Z
X 1 1 1 Hi-Z Hi-Z Hi-Z

2.1 - 2

OM9369

ABSOLUTE MAXIMUM RATINGS

Motor Supply Voltage, Vm.................................................. 300 Vdc

Peak Motor Supply Voltage V

Average Phase Output Current, Io ................................... 25 Amperes DC*

Peak Phase Output Current, Iom................................... 50 Amperes Peak**

Control Supply Voltage, V

cc

Logic Input Voltage (Note 1) ............................................ -0.3 V to +8 V

Reference Source Current ................................................ -30 mAdc

Error Amplifier Input Voltage Range, (EA1+/EA1-) ....................-0.3 Vdc to 10 Vdc

Error Amplifier Output Current .............................................. ±8 mAdc

Spare Amplifier Input Voltage (EA2+/EA2-) ...........................-0.3 Vdc to 10 Vdc

Spare Amplifier Output Current ............................................. ±8 mAdc

Current Sense Amplifier Input Voltage (ISH/ISL) ....................... -0.3 V to +6 Vdc

Current Sense Amplifier Output Current.....................................±10 mAdc

Tachometer Output Current................................................±10 mAdc

PWM Input Voltage ..............................................-0.3 Vdc to +6 Vdc

Operating Junction Temperature .....................................-55°C to +150° C

Storage Temperature Range........................................-65° C to +150° C

Power Switch Junction-to-Case Thermal Resistance, Rθ

Package Isolation Voltage .................................................600 Vrms

Lead Soldering Temperature .............300°C, 10 seconds maximum, 0.125” from case

* Tcase = 25° C
** Tcase = 25° C, Maximum pulse width = 10mSec

........................................... 500 Vdc

m pK

................................................... +18 V

jc......................0.48°C/W

RECOMMENDED OPERATING CONDITIONS (Tcase = 25° C)

Motor Power Supply Voltage, Vm ......................................... +270Vdc

Average Phase Output Current, I

With Internal Current Sense Resistor (Note 2)

Each Power Switch .............................................25 A

Control Supply Voltage, V

cc

Logic Low Input Voltage, Vil........................................... 0.8 Vdc (max)

Logic High Input Voltage, Vih........................................... 2.0 Vdc (min)

Note 1: Logic Inputs: Direction, Hall Inputs (H1...H3) Overvoltage - Coast, Speed, and Quad Select.
Note 2: The internal 5mΩ current sense resistor is limited to 6 Wdc power dissipation. Other values are available.

Please contact the factory for more information.

O

............................................ 15Vdc ±10%

2.1 - 3

ELECTRICAL CHARACTERISTICS

PARAMETER SYMBOL CONDITIONS (NOTE 1) MIN. TYP. MAX. UNITS
Power Output Section
IGBT Leakage Current I

IGBT c-e Saturation Voltage Vce(sat) Ic = 50Adc 3.2 V

Diode Leakage Current I
Diode Forward Voltage V

Diode Reverse Recovery Time trr Io= 1A, di/dt = -100A/usec, 50 ns

Control Section

Control Supply Current Icc Vcc over operating range 100 mA

Control Turn-On Threshold Vcc(+) Tc over operating range 9.45 V

Driver Turn-On Threshold Vcc(+) Tc over operating range 13.0 V

Reference Section

Output Voltage Vr
Output Voltage Vr

Output Current Io --- --- 30 mA
Load Regulation Iload = 0mA to -20mA -40 -5 mV
Short Circuit Current Isc Tc over operating range 50 100 150 mA

Error Amplifier / Spare Amplifier Sections

EA1 / EA2 Input Offset Current Ios V(pin 2) = V(pin 4) = 0V -30 -3 0 nA

EA1 / EA2 Input Bias Current Iin V(pin 2) = V(pin 4) = 0V -50 -45 0 nA

Input Offset Voltage Vos 0V < Vcommon-mode < 3V 7 mV
Amplifier Output Voltage Range -- 0 6 V

PWM Comparator Section

PWM Input Current Iin V(pin 9) = 2.5V 0 3.0 30 uA

Current-Sense Amplifier Section

ISH / ISL Input Current Iin V(pin 12) = V(pin 13) = 0V -850 -320 0 uA
Input Offset Current Ios V(pin 12) = V(pin 13) = 0V +/-2 +/-12 uA

Peak Current Threshold Voltage Vpk V(pin 12) = 0V, V(pin 13) 0.14 0.20 0.26 V

Over Current Threshold Voltage Voc V(pin 12) = 0V, V(pin 13) 0.26 0.30 0.36 V

ISH / ISL Input Voltage Range -- (Note 2) -1 2 V
Amplifier Voltage Gain Av V(pin 12) = 0.3V, V(pin 13) 1.75 1.95 2.15 V/V

Amplifier Level Shift -- V(pin 12) = V(pin13) = 0.3V 2.4 2.5 2.65 V

Logic Input Section

H1, H2, H3 Low Voltage Threshold Vil Tc over operating range 0.8 1.0 1.2 V
H1, H2, H3 High Voltage Threshold Vih Tc over operating range 1.6 1.9 2.0 V
H1, H2, H3 Input Current Iin Tc over operating range, -400 -250 -120 uA

Quad Select / Direction
Threshold Voltage Vth Tc over operating range 0.8 1.4 2.0 V
Quad Select Voltage Hysteresis Vh 70 mV
Direction Voltage Hysteresis Vh 0.6 V
Quad Select Input Current Iin -30 50 150 uA
Direction Input Current Iin -30 -1 30 uA

Overvoltage / Coast Input Section

Overvoltage / Coast Inhibit
Threshold Voltage Vth Tc over operating range 1.65 1.75 1.85 V
Overvoltage / Coast Restart
Threshold Voltage Vth Tc over operating range 1.55 1.65 1.75 V

Overvoltage / Coast Hysteresis Voltage Vh 0.05 0.10 0.15 V
Overvoltage / Coast Input Current Iin -10 -1 0 uA

ces

r

ef
ef

Vce = 600Vdc 300 uA
V

= 0V

ge

V

= 15V

ge

Vr= 600Vdc 100 uA
If= 37A 1.7 V

f

Vr = 30V

Tc over operating range 4.7 5.0 5.3 V

V(pin 3) = V(pin 6) = 0V

V(pin 3) = V(pin 6) = 0V

Varied to Threshold

Varied to Threshold

= 0.5V to 0.7V

V(pin 20, 21 or 22) = 0Vdc

4.9 5.0 5.1 V

2.1 - 4

OM9369

OM9369

Parameter Symbol Conditions (Note 1) MIN. TYP. MAX. Units

Soft-Start Section

Soft-Start Pull-Up Current Ip V(pin) 18) = 0V -16 -10 -5 uA
Soft-Start Discharge Current Id V(pin 18) = 2.5V 0.1 0.4 3.0 mA

Soft-Start Reset Threshold Voltage Vth 0.1 0.2 0.3 V

Tachometer/Brake Section
Tachometer Output High Level Voh

Tachometer Output Low Level Vol
Tachometer On-Time ton 85 100 140 us

Tachometer On-Time Variation -­Brake/Tach Timing Input Current Iin V (pin 16) = 0V -4.0 -1.9 mA

Brake/Tach Timing
Threshold Voltage Vth

Brake/Tach Timing
Voltage Hysteresis Vh 0.09 V
Speed Input Threshold Voltage Vth Tc over operating range 220 257 290 mV
Speed Input Current Iin -30 -5 30 uA

Oscillator Section
Oscillator Frequency fo Measured at pin 10 13.5 14.8 20.0 kHz

Tc over operating range 4.7 5.0 5.3 V

(Pin 15) 10kΩ to 2.5 V

Tc over operating range

(Pin 15) 10kΩ to 2.5 V 0.2 V

Tc over operating range 0.1 %

Tc over operating range 0.8 1.0 1.2 V

SPECIFICATION NOTES:

1. All parameters specified for Ta = 25°C, Vcc = 15Vdc, Rosc = 75K
are sourced by (flow from) the pin under test.

2. Either ISH or ISL may be driven over the range shown.

3. Bold parameters tested at -55°C, 25°C, 125°C for SFB.

PINOUT

PIN# NAME PIN# NAME

1 VCC 23 Speed Input
2 EA1 “-” Input 24 Direction Input
3 EA2 “+” Input 25 CSH
4 EA1 “+” Input 26 CSL
5 +5V Reference Output 27 Motor Return
6 EA2 “-” Input 28 Motor Return
7 EA2 Output 29 Source C
8 EA1 Output 30 Source C

9 PWM Input 31 Phase C Output
10 Oscillator Timing Input 32 Phase C Output
11 Isense 33 Vmotor
12 ISH 34 Source B
13 ISL 35 Source B
14 Quad Select Input 36 Phase B Output
15 Tachometer Output 37 Phase B Output
16 Brake/Tach Timing Input 38 Vmotor
17 Overvoltage/Coast Input 39 Source A
18 Soft-Start Input 40 Source A
19 Ground 41 Phase A Output
20 H3 Input 42 Phase A Output
21 H2 Input 43 Vmotor
22 H1 Input (Case) (No Connection)

Ω (to Vref), Cosc = 1800 pF, and all Phase Outputs unloaded (Ta ~ Tj). All negative currents shown

2.1 - 5

PIN DESCRIPTIONS / FUNCTIONALITY

VCC (Pin 1) -- The Vcc Supply input provides bias

voltage to all of the internal control electronics within
the OM9369, and should be connected to a nominal
+15Vdc power source. High frequency bypass
capacitors (10uF polarized in parallel with 0.1uF
ceramic are recommended) should be connected as
close as possible to pin 1 and Ground (pin 19).

ERROR AMPLIFIER (EA1- Input, Pin 2; EA1+
Input, Pin 4; EA1 Output, Pin 8) -- The Error

Amplifier is an uncommitted LM158-type operational
amplifier, providing the user with many external
control loop compensation options. This amplifier is
compensated for unity gain stability, so it can be
used as a unity gain input buffer to the internal PWM
comparator when pin 2 is connected to pin 8. The
output of the Error Amplifier is internally connected
to the PWM comparator's "-" input, simplifying
external layout connections.

+5V REFERENCE OUTPUT (Pin 5) -- This output
provides a temperature-compensated, regulated
voltage reference for critical external loads. It is
recommended that this pin be used to power the
external Hall-effect motor position sensors. By
design, the +5V reference must be in regulation
before the remainder of the control circuitry is
activated. This feature allows the Hall-effect sensors
to become powered and enabled before any Phase
Output is enabled in the OM9369, preventing
damage at turn-on. High-frequency bypass
capacitors (10uF polarized in parallel with 0.1uF
ceramic are recommended) should be connected as
close as possible to pin 5 and Ground (pin 19).

SPARE AMPLIFIER (EA2- Input, Pin 6; EA2+
Input, Pin 3; EA2 Output, Pin 7) -- The Spare

Amplifier is an uncommitted LM158-type operational
amplifier, and in addition to the internal error
amplifier, provides the user with additional external
control loop compensation options. This amplifier is
also compensated for unity gain stability and it can
be used as a unity gain input buffer when pin 6 is
connected to pin 7. If the Spare Amplifier is unused,
pin 3 should be connected to Ground, and pin 6
should be connected to pin 7.

PWM INPUT (Pin 9) -- This pin is connected to the
"+" input of the internal PWM comparator. The PWM
output clears the internal PWM latch, which in turn
commands the Phase Outputs to chop. For voltage­mode control systems, pin 9 may be connected to
the Oscillator Timing Input, pin 10.

OSCILLATOR TIMING INPUT (Pin 10) -- The Oscillator

OM9369

Timing Input sets a fixed PWM chopping frequency by
means of an internal resistor (Rosc), whose value is set
to 75kΩ, connected from pin 10 to the +5V Reference
Output, and an internal capacitor (Cosc), whose value
is 1800pF, connected from pin 10 to Ground. In custom
applications, the recommended range of values for
Rosc is 10kΩ to 100kΩ, and for Cosc is 0.001uF to

0.01uF, and the maximum operating frequency should
be kept below 20kHz. The approximate oscillator
frequency is:

2

fo = (Rosc x Cosc)

The voltage waveform on pin 10 is a ramp whose
magnitude is approximately 1.2Vp-p, centered at
approximately 1.6Vdc. In addition to the voltage-mode
PWM control, pin 10 may be used for slope
compensation in current-mode control applications.

ISENSE (Pin 11) -- This pin is connected to the output
of the internal current-sense amplifier. It drives a peak­current (cycle-by-cycle) comparator which controls
Phase Output chopping, and a fail-safe current
comparator which, in the event of an output overcurrent
condition, activates the soft-start feature and disables
the Phase Outputs until the overcurrent condition is
removed. The magnitude of the voltage appearing at pin
11 is dependent upon the voltages present at the
current-sense amplifier inputs, ISH and ISL:

V(Isense) = 2.5V + [2 x ABS (ISH - ISL)] [Volts]

CURRENT SENSE INPUTS (ISH, Pin 12; ISL, pin 13)

-- These inputs to the current-sense amplifier are
interchangeable and they can be used as differential
inputs. The differential voltage applied between pins 12
and 13 should be kept below +/-0.5Vdc to avoid
saturation.

QUAD SELECT INPUT (Pin 14) -- This input is used to
set the OM9369 in a half control or full control chopping
regime. When driven with a logic low level, the OM9369
is in the half control mode, whereby only the three lower
(pull-down) power switches associated with the Phase
Outputs are allowed to chop. Alternately, when driven
with a logic high level, the OM9369 is in the full control
mode, where all six power switches (pull-up and pull­down) associated with the Phase Outputs are chopped
by the PWM. During motor braking, changing the logic
state of the Quad Select Input has no effect on the
operation of the OM9369.

[Hz]

2.1 - 6

OM9369

TACHOMETER OUTPUT (Pin 15) -- This output

provides a fixed width 5V pulse when any Hall-effect
Input (1, 2 or 3) changes state. The pulse width of the
Tachometer Output is set internally in the OM9369 to
113µs (nominal). The average value of the output
voltage on pin 15 is directly proportional to the motor's
speed, so this output may be used (with an external
averaging filter) as a true tachometer output, and fed
back to the Speed Input (pin 23) to sense the actual
motor speed.
Note: Whenever pin 15 is high, the internal Hall-effect
position latches are inhibited (i.e. "latched"), to reject
noise during the chopping portion of the commutation
cycle, and this makes additional commutations
impossible. This means that in order to prevent false
commutation at a speed less than the desired
maximum speed, the highest speed as observed at
the Tachometer Output should be set above the
expected maximum value.

BRAKE / TACH TIMING INPUT (Pin 16) -- The
Brake/Tach Timing Input is a dual-purpose input.
Internal to the OM9369 are timing components tied
from pin 16 to Ground (a 51kΩ resistor and a 3300pF
capacitor). These components set the minimum pulse
width of the Tachometer Output to 113µs, and this
time may be adjusted using external components,
according to the equation:

T(tach) = 0.67 x (Ct+ 3300pf) x

The recommended range of external resistance (to
Ground) is 15kΩ to ∞, and the range of external
capacitance (to Ground) is 0pF to 0.01uF. With each
Tachometer Output pulse, the capacitor tied to pin 16
is discharged from approximately 3.33V to
approximately 1.67V by an internal timing resistor.
The Brake / Tach Timing Input has another function. If
this pin is pulled below the brake threshold voltage,
the OM9369 will enter the brake mode. The brake
mode is defined as the disabling of all three high-side
(pull-up) drivers associated with the Phase Outputs,
and the enabling of all three low-side (pull-down)
drivers.

OVERVOLTAGE / COAST INPUT (Pin 17) -- This
input may be used as a shutdown or an
enable/disable input to the OM9369. Also, since the
switching inhibit threshold is so tightly defined, this
input can be directly interfaced with a resistive divider
which senses the voltage of the motor supply, Vm, for
overvoltage conditions. A high level (greater than the
inhibit threshold) on pin 17 causes the coast condition
to occur, whereby all Phase Outputs revert to a Hi-Z
state and any motor current which flowed prior to the
Overvoltage / Coast command is commutated via the
power "catch" rectifiers associated with each Phase
Output.

Rt x 51kΩ )(µs)

(

Rt + 51kΩ

SOFT-START INPUT (Pin 18) -- The Soft-Start input is

internally connected to a 10µA (nominal) current source,
the collector of an NPN clamp/discharge transistor, and
a voltage comparator whose soft-start/restart threshold
is 0.2Vdc (nominal). An external capacitor is connected
from this pin to Ground (pin 19). Whenever the Vcc
supply input drops below the turn-on threshold,
approximately 9Vdc, or the sensed current exceeds the
over-current threshold, approximately 0.3V at the current
sense amplifier, the soft-start latch is set. This drives the
NPN clamp transistor which discharges the external soft­start capacitor. When the capacitor voltage drops below
the soft-start/restart threshold and a fault condition does
not exist, the soft-start latch is cleared; the soft-start
capacitor charges via the internal current source.

In addition to discharging the soft-start capacitor, the
clamp transistor also clamps the output of the error
amplifier internal to the controller IC, not allowing the
voltage at the output of the error amplifier to exceed the
voltage at pin 18, regardless of the inputs to the amplifier.
This action provides for an orderly motor start-up either
at start-up or when recovering from a fault condition.

GROUND (Pin 19) -- The voltages that control the
OM9369 are referenced with respect to this pin. All
bypass capacitors, timing resistors and capacitors, loop
compensation components, and the Hall-effect filter
capacitors must be referenced as close as possible to
pin 19 for proper circuit operation. Additionally, pin 19
must be connected as close as physically possible to the
Motor Return, pins 27 and 28.

HALL-EFFECT INPUTS (H1, Pin 22; H2, Pin 21; H3,
Pin 20) -- Each input has an internal pull-up resistor to

the +5V Reference. Each input also has an internal
180pF noise filter capacitor to Ground. In order to
minimize the noise which may be coupled from the motor
commutation action to these inputs, it is strongly
recommended that additional external filter capacitors,
whose value is in the range of 2200pF, be connected
from each Hall-Effect Input pin to Ground. Whatever
capacitor value is used, the rise/fall times of each input
must be guaranteed to be less than 20us for proper
tachometer action to occur. Motors with 60 degree
position sensing may be used if one or two of the Hall­effect sensor signals is inverted prior to connection to the
Hall-Effect Inputs.

2.1 - 7

SPEED INPUT (Pin 23) - This pin is connected to the
“+” input of a voltage comparator, whose threshold is

0.25Vdc. As long as the Speed Input is less than

0.25V, the direction latch is transparent. When the
Speed Input is greater than 0.25V, then the direction
latch inhibits all changes in direction. It is
recommended, especially while operating in the half
control mode, that the Tachometer Output is
connected to the Speed Input via a low-pass filter,

such that the direction latch is transparent only
when the motor is spinning very slowly. In this

case, the motor has too little stored energy to damage
the power devices during direction reversal.

DIRECTION INPUT (Pin 24) - This input is used to
select the motor direction. This input has an internal
protection feature: the logic-level present on the
Direction Input is first loaded into a direction latch, then
shifted through a two-bit shift register before
interfacing with the internal output phase driver logic
decoder. Also, protection circuitry detects when the
input and the output of the direction latch or the 2-bit
shift register are different, and inhibits the Phase
Outputs (i.e. Hi-Z) during those times. This feature
may be used to allow the motor to coast to a safe
speed before a direction reversal takes place. Power
stage cross-conduction (current "shoot-through" from
Vmotor to Ground through simultaneously enabled
pull-up and pull-down drivers) is prevented by the shift
register as it is clocked by the PWM oscillator, so that
a fixed delay of between one and two PWM oscillator
clock cycles occurs. This delay or "dead-time"
guarantees that power-stage cross-conduction will not
occur.

CURRENT SENSE OUTPUTS (CSH, Pin 25; CSL,
Pin 26) - The Current Sense Outputs produce a

differential voltage equal to the motor current times the
sense resistance value (5mΩ nominal). There is an
internal 1000pF filter capacitor across pins 25 and 26,
and two 100Ω series resistors, one between each pin
and each end of the current sense resistor. To
configure the current sense amplifier for cycle-by-cycle
current limiting and/or overcurrent protection, connect
pin 25 to pin 12 (ISH) and pin 26 to pin 13 (ISL).

OM9369

SOURCE (Pins 29, 30, 34, 35, 39 and 40) -- The

source pins form the low-side connection of the pull­down switches associated with each Phase Output.
Because of the switching current capability of the
OM9369, all 6 pins should be externally connected
together with a low impedance bus to minimize losses
and voltage differentials. Also, due to layout design
considerations, pins 29 and 30 are internally
connected to the "top" of the internal current-sense
resistor.

PHASE OUTPUTS (Phase A, Pins 41 and 42; Phase
B, Pins 36 and 37; Phase C, Pins 31 and 32) --

These outputs are connected to either Vmotor via the
pull-up driver or Source via the pull-down driver,
depending upon the Hall-Effect and Direction Inputs
(see Commutation Truth Table). The two pins
associated with each Phase Output must be
connected to one of the three phases of the motor
driven by the OM9369.

V

MOTOR

connected to the most positive terminal of the motor
supply (Vm+). For proper operation, all three pins
must be connected together externally with a low
impedance power bus. The V
be bypassed with an adequately voltage-rated
ceramic capacitor, 0.1µF (typical), and a low-ESR
electrolytic capacitor, whose capacitance value can be
selected by the following: 10µF-per-Ampere of
average motor current from V

Note: All connections, including the power bus
capacitor connections, must be made as close as
possible to the V
minimize parasitic effects.

PACKAGE AND SCREENING OPTIONS

The OM9369 is offered in a hermetic flatpack package
as well as a plastic ring frame, low profile flatpack
package. The hermetic package, F-43, is shown in
Figure 1. The plastic ring frame, low profile package,
MP3-43L, has slightly larger dimensions and is shown
in Figure 2.

(Pins 33, 38, and 43) - These pins are

power bus should

motor

to Motor Return.

motor

and Motor Return pins to

motor

MOTOR RETURN (Pins 27 and 28) - These pins are

connected to the most negative terminal of the motor
supply (Vm-). This connection is electrically isolated
from the logic Ground internal to the OM9369 package
to minimize, if not eliminate, noise on the logic ground.
The connection to the logic ground is made by the user
external to the package (refer to Ground (pin 19)). In
order to minimize packaging losses and parasitic
effects, it is essential that both of these pins be firmly
connected to the motor supply Ground, with as short a
connection as physically possible.

The hermetic version is offered in two standard
screening levels: a full military temperature range of ­55°C to +125°C with limited screening and with MIL­STD-883 screening. The plastic ring frame version is
offered in an industrial temperature range of -40°C to
+85°C with limited screening.

The screening levels for the SFB, SF and SPP
versions are listed in the table below. All tests and
inspections are in accordance with those listed in MIL­STD-883.

2.1 - 8

OM9369

Test/Inspection SFB SF SPP

Precap Visual Inspection 100% 100% 100%
Temperature Cycle 100% N.A. N.A.
Mechanical Shock 100% N.A. N.A.
Hermeticity (Fine and Gross Leak) 100% 100% N.A.
Pre Burn-In Electrical 100% N.A. N.A.
Burn-In (160 hours) 100% N.A. N.A.
Final Electrical Test -55°C, +25°C, +25°C +25°C

+125°C
Group A Testing 100% N.A. N.A.
Final Visual Inspection 100% 100% 100%

APPLICATIONS

Start-Up Conditions

The OM9369 3-phase brushless DC motor
controller/driver is designed to drive fractional to
integral horsepower motors. To ensure proper
operation, it is necessary to ensure that the high-side
bootstrap capacitors are charged during initial start­up. However, the method(s) used to ensure this may
be dependent upon the application. For example,
some applications may only require that OV_COAST
(pin 17) be connected to ground, either via a hardwire
connection or via a switch (Enable/Disable), before
applying Vcc. When Vcc is applied, the
controller/driver is forced into brake mode for
approximately 200µsec (all high-side drivers are
disabled and all low-side drivers are enabled).

This may not be adequate for other applications;
RC_BRAKE (pin 16) may have to be momentarily
connected to ground via a switch, either manually or
electronically (ref. Figure 3). Note that with the
component values shown in Figure 3, RC_BRAKE is
pulled low for approximately 300 mSec after applying
Vcc at pin1.

Modes of Operation

Figures 4 and 5, shown on the following pages,
provide schematic representations of typical voltage­mode and current-mode applications for the OM9369
controller/driver.

Figure 4 represents the implementation of a typical
voltage-mode controller for velocity control. Avoltage
or speed command is applied to the noninverting input
of the error amplifier which is configured as a voltage
follower. The output of the error amplifier is compared
to a pulse width modulated ramp, and since motor
speed is nearly proportional to the average phase

output voltage, the speed is controlled via duty cycle
control. If a speed feedback loop is required, the
tachometer output can be connected to the inverting
input of the error amplifier via a loop compensation
network.

Figure 4 also shows the implementation of the cycle­by-cycle current limit/overcurrent protection feature of
the OM9369. The load current is monitored via the
controller’s internal sense resistor. The current sense
signal is filtered and fed into the current sense amplifier
where the absolute value of ISH-ISLis multiplied by two
and biased up by 2.5 volts. The output of the current
sense amplifier is compared to a fixed reference, thus
providing cycle-by-cycle current limiting and/or
overcurrent protection as necessary. The typical peak
current threshold (ISH-ISL) is 0.20 volts; the typical
over current threshold (ISH-ISL) is 0.30 volts.

Figure 5 represents the implementation of a typical
current-mode controller for torque control. The load
current is monitored via the controller’s internal sense
resistor. The current sense signal is filtered and fed
into the current sense amplifier where the absolute
value of ISH-ISL is multiplied by two and biased up by

2.5 volts. Besides the implementation of the cycle-by­cycle current limit/overcurrent protection feature of the
OM9369 discussed in the preceding paragraph, the
output of the current sense amplifier is fed into the error
amplifier which is configured as a differential amplifier.
An error signal representing the difference between the
current command input and the value of the amplified
current sense signal is produced. Then it is compared
to a pulse width modulated ramp and since torque is
nearly proportional to the average phase output
current, the torque is controlled via duty cycle control.

2.1 - 9

MECHANICAL OUTLINE

3.100

2.850

.30

25 x .100
Tol. Non-Cumulative

.125 .250

2.50

TYP.

•Pin1

.130
REF.

2.100

1.860

1.600

.128 DIA.
4 HOLES

.250

TYP.

16 x .150
Tol. Non-Cumulative

OM9369

2.40

.350

.385
MAX.

.125

TYP.

.020
DIA.

.500
.750

.050

.040
DIA.

Fig 1: Mechanical Outline F-43 Hermetic Package

Fig 2: Mechanical Outline MP3-43L Plastic Ring Frame Package

2.1 - 10

Fig 3: Optional Start-Up Circuit

OM9369

+15V

3.24k

COMMAND

1k

1.50k

FROM MOTOR HALL SENSORS

H3
H2
H1

10uF

4700pF

.1uF

+

1

Vcc

2

EA1-

3

EA2+

4

EA1+

5

VREF

6

EA2-

7

EA2_OUT

8

EA1_OUT

9

PWM_IN

10

OSCILLATOR

11

I_SENSE

12

ISH

13

ISL

14

.1uF

10k

.1uF

232

232

15
16
17
18
19
20
21
22
23
24
25
26

QUAD_SEL

TACH_OUT

BRAKE

OV_COAST

SOFT_START

GROUND

H3_HALL_INPUT

H2_HALL_INPUT

H1_HALL_INPUT

SPEED_IN

DIRECTION

CSH

CSL

PHASE_A_OUT
PHASE_A_OUT

PHASE_B_OUT
PHASE_B_OUT

PHASE_C_OUT
PHASE_C_OUT

MOTOR_RETURN
MOTOR_RETURN

V_MOTOR

SOURCE_A
SOURCE_A

V_MOTOR

SOURCE_B
SOURCE_B

V_MOTOR

SOURCE_C
SOURCE_C

43

42
41

40
39

38

37
36

35
34

33

32
31

30
29

28
27

C_BUS

Fig 4: Implementation of a Voltage-Mode Controller

C_FILT

+

HALL SENSORS

V_MOTOR

H1
H2
H3

MOTOR

2.1 - 11

CURRENT_COMMAND

205 Crawford Street, Leominster, MA 01 453 USA [phone] FAX [phone]
Visit Our Web Site at www.omnirel.com

+15V

3.24k

OM9369

.1uF10uF

+

1k

OFFSET

3.24k

MOTOR HALL SENSORS

H3
H2
H1

35.6k

.26uF

1800pF

43k

4700pF

2k

10k.1uF

.1uF

232

232

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

Vcc
EA1­EA2+
EA1+
VREF
EA2­EA2_OUT
EA1_OUT
PWM_IN
OSCILLATOR
I_SENSE
ISH
ISL
QUAD_SEL
TACH_OUT
BRAKE
OV_COAST
SOFT_START
GROUND
H3_HALL_INPUT
H2_HALL_INPUT
H1_HALL_INPUT
SPEED_IN
DIRECTION
CSH
CSL

V_MOTOR

PHASE_A_OUT
PHASE_A_OUT

SOURCE_A
SOURCE_A

V_MOTOR

PHASE_B_OUT
PHASE_B_OUT

SOURCE_B
SOURCE_B

V_MOTOR

PHASE_C_OUT
PHASE_C_OUT

SOURCE_C
SOURCE_C

MOTOR_RETURN
MOTOR_RETURN

43

42
41

40
39

38

37
36

35
34

33

32
31

30
29

28
27

C_BUS

Fig 5: Implementation of a Current-Mode Controller

C_FILT

+

HALL SENSORS

V_MOTOR

H1
H2
H3

MOTOR

2.1 - 12