APEX SA305

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FEATURES
• LOW COST 3 PHASE INTELLIGENT SWITCHING
AMPLIFIER
• 3 FULLY PROTECTED HALF BRIDGES
• UP TO 60V SUPPLY
• OUTPUT CURRENT - 5 AMPS (CONT) PER HALF BRIDGE
• NO “SHOOT THROUGH” CURRENT
APPLICATIONS
• 3 PHASE BRUSHLESS DC MOTORS
• 3 INDEPENDENT SOLENOID ACTUATORS
DESCRIPTION
The SA305 is an integrated, fully protected, 3 phase brushless DC motor driver IC. Three independent half bridges provide up to 5A of continuous (10A peak) output current under
microcontroller or DSP control.
Thermal, short circuit, shoot through, and over current protection are included in this power device. Fault status indication
and current level monitors are provided directly to the controller.
The SA305 is built using a multi-technology process allowing
CMOS logic control and DMOS output power devices on the
same IC. Output current is measured using an innovative
low loss technique. The SIP package offers superior thermal
performance with a flexible footprint.
23 Pin SIP
Package Style EX
TYPICAL APPLICATION
EXTERNAL CONNECTIONS
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The SA305 offers a level of power integration unmatched by
others in the field of fractional HP brushless motor control.
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
SA305
PIN
DESCRIPTIONS
Pin Descriptions
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Pin #
10,21
17
22
13
2
1,23
11
19
Pin name
Vs/VPWR Vdd
OutA
OutB
OutC
PGND
SGND
DISABLE
18
Warning
8
FAULT
16
15
12
14
7
5
20
3
4
9
PWM_HA
PWM_LA
PWM_HB
PWM_LB
PWM_HC
PWM_LC
IMON_A
IMON_B
IMON_C
OFF
R
Y
Description
High voltage supply (12V-60V)
Logic supply (5V)
Half bridge output
Half bridge output
Half bridge output
Power ground, high current ground return path of the bridge outputs
Analog and logic circuits ground
Disable logic Input, CMOS. When high disables all six output MOSFETs independent of the Control registers.
Output pin goes high at Tj > 135°C.
The Fault output is raised under the following conditions:
a) Short-Circuit and Over Current condition.
b) High Temperature condition.
c) High Voltage Supply Vs < 12V.
This can be used as an interrupt to the microcontroller. It will be reset after status data has been read by
the microcontroller. A FAULT will also disable the outputs of the device.
goes high in order to indicate the Pchannel of output A is to be turned on.
goes high in order to indicate the Nchannel of output A is to be turned on.
goes high in order to indicate the Pchannel of output B is to be turned on.
goes high in order to indicate the Nchannel of output B is to be turned on.
goes high in order to indicate the Pchannel of output C is to be turned on.
goes high in order to indicate the Nchannel of output C is to be turned on.
Current monitor output, approximate current 1/4000 of Phase A current
Current monitor output, approximate current 1/3600 of Phase B current
Current monitor output, approximate current 1/3700 of Phase C current
Disables all Fault Mechanisms when pulled HIGH
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All inputs are CMOS levels. Inputs can accept CMOS levels as low as 3.3 volts
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
SA305
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +Vs
SUPPLY VOLTAGE, Vcc
OUTPUT CURRENT, peak, 200ms
POWER DISSIPATION, internal, DC
TEMPERATURE, pin solder, 10s
TEMPERATURE, junction2
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE, case
60V
5.5V
10A
TBD
225°C.
150°C.
−55 to 125°C.
−40 to 85°C.
SPECIFICATIONS
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
INPUTS
Logic Low Voltage
1
Logic High Voltage
1.8
POWER SUPPLY
Vs
12
Vcc
4.5
Supply Current, Vpwr
10 KHz (One channel switching
8.5
at 50% duty cycle), VPWR=50V,
Vdd=5V
Supply Current, Vdd
10 KHz (One channel switching
4
at 50% duty cycle), VPWR=50V,
Vdd=5V
ANALOG
Current Sense Linearity
Current Sense Linearity
A
Iout = 1A to 5A
0.6
Iout = 100mA to 5A
N
I
Y
L
E
M
I
R
V
V
60
5.5
35
V
V
mA
6
mA
1.5
5
%
%
R
OUTPUT
Output Current, continuous
5
Output Current, Peak
For 200ms
10
Turn on delay, default
183
Turn off delay, default
240
Switching time, on, default
47
Switching time, off, default
52
On resistance, PCHAN FET
5A Load (Room Temperature)
325
600
On resistance, NCHAN FET
5A Load (Room Temperature)
250
600
Short circuit turn off time
TBD
Thermal Shutdown
155
160
Thermal Warning
135
Overcurrent Shutdown
10
12
THERMAL
RESISTANCE, junction to case
Full temperature range
0.95
RESISTANCE, junction to air
Full temperature range
TEMPERATURE RANGE, case
−40
UNITS
TBD
TBD
85
A
A
nS
nS
nS
nS
mΩ
mΩ
nS
°C
°C
A
°C/W
°C/W
°C
NOTES: 1. Unless otherwise noted: TC=25°C, power supply voltage is typical rating. (VPWR = 50 V, Vdd = 5V).
2. Long term operation at the maximum junction temperature will result in reduced product life. De-rate internal power dissipation
to achieve high MTBF.
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
SA305
TYPICAL PERFORMANCE
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APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
SA305
TYPICAL PERFORMANCE
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
SA305
OPERATING
CONSIDERATIONS
GENERAL
Please read Apex Application Note 1 “General Operating Considerations” which covers stability, power supplies,
heat sinking, mounting, current limit, SOA interpretation, and
specification interpretation. Visit www.apexmicrotech.com for
design tools that help automate tasks such as calculations
for stability, internal power dissipation, current limit, heat sink
selection, Apex’s complete Application Notes library, Technical
Seminar Workbook and Evaluation Kits.
GROUND PINS
Analog and Power Grounds should be connected externally
at only one point on the motor control board in such a way
that there is no current flow through the connection to avoid
noise related issues.
PROTECTION
Each of the six output devices includes short circuit protection to prevent damage from direct shorts to GND or VS. The
SA305 is protected against overheating with built in thermal
monitoring. The thermal protection will engage when the temperature of the MOSFETs reach approximately 160°C. The
FAULT output pin will latch “HIGH” if either protection circuits
engages and will place all MOSFETs in the “OFF” state (high
impedance output). The most severe condition for any power
device is a direct, hard-wired (“screwdriver”) short from an
output to ground. While the short circuit protection will latch
the output MOSFETs the die and package may be required
to dissipate up to 500 Watts of power until the protection is
engaged. This energy can be destructive, particularly at higher
operating voltages, so good thermal design is critical if such
fault tolerance is required of the system. The Vs and PGND
pins may become very hot during this period of high current.
The SA305 has an internal FAULT latch mechanism by
which the device stays disabled (in case a fault occurs) unless the user resets it. If the SA305 goes into FAULT condition
because of short-circuit, over current or high temperature,
the DISABLE pin needs to be pulled HIGH (briefly) to reset
the SA305 and resume normal operation. However, before
resetting the SA305 the user has to ensure that the FAULT
has been eliminated.
Undervoltage lockout is not required since the power stage
is complimentary and does not need a charge pump to activate
the high side FETs. A True signal on the FAULT pin indicates
that at least one of these protection events has occurred. Once
a FAULT has occurred, fault condition must be removed in
order for the FAULT signal to be removed.
CONTROL
R
L
E
CURRENT SENSE
The current of each phase can be read using the IMON output
pins. The high side of each half bridge current is monitored
separately. The current sense output level is as follows:
CHANNEL A: 1/4000th of the phase current.
CHANNEL B: 1/3600th of the phase current.
CHANNEL C: 1/3700th of the phase current.
External power current sense resistors are not required with
the SA305. However, in order to read the current level using a
standard A/D input a resistor of 1KΩ should be shunted across
each output. A standard 1/4W resistor is sufficient here. Motor
current adjustments are made through the PWM inputs. Above
the internal limit the device self-protects.
SA305 OPERATION
POWER SUPPLY BYPASSING
Bypass capacitors to power supply terminals +Vs and –Vs
must be connected physically close to the pins to prevent lo-
A
R
Y
The SA305 is used to drive three phase motors but can
be used where ever three high current outputs are required.
A DSP or microcontroller is used to control and monitor the
operation of the SA305.
The current through each of the three P channel drive
transistors is monitored by on-board circuitry. Current is set
using the PWM inputs which drive each FET independently.
Once the desired level is reached the inductance of the motor keeps the current near the programmed level. Should the
current get to the internally set 12A level, the driver is shutoff
to protect itself.
Whenever there are no “fault” conditions and the input controls
indicate an output should be on, the P and N drivers will turn
on. If the input controls are requiring that P-channel turn on
before the N-channel turns off, the SA305 will automatically
delay the P-channel turn on. The time between the N turning
off and the P turning on or the P channel turning off and the
N channel turning on is called dead time. An internally set
minimum dead time assures no “shoot through” current and
gives the clamp diode time to discharge.
The warning temperature setting is fixed at Tj= 135C. When
the junction temperature gets to the programmed point, the
temperature warning bit will be set. It will be reset when the
temperature falls below the programmed limit.
The Fault temperature setting is fixed at Tj= 160C. Once
the Fault temperature has been reached the Fault Output
goes high and the outputs of the device are disabled. This
output can be used as a microcontroller interrupt. The Fault
latch will not be reset until the temperature is below the fault
temperature setting.
If more than one output is required to be conducting large
currents at the same time, the maximum current will need to
be de-rated.
M
I
Each output device is controlled by a single input. There is
a provision inside the SA305 to prevent the upper and lower
FET of the same channel from being active at the same time
even though the input controls request that both the N and P
devices from half bridges be on.
P
cal parasitic oscillation in the output stage of the SA305. Use
electrolytic capacitors at least 10μF per output amp required.
Bypass the electrolytic capacitors with high quality ceramic
capacitors (X7R) 0.1μF or greater. See the external connections diagram on page 1.
N
I
This data
sheet has been carefullyCORPORATION
checked and is believed
to be NORTH
reliable, however,
no responsibility
is assumed for
possible inaccuracies
omissions.
All specifications HOTLINE:
are subject to1change
notice.
APEX
MICROTECHNOLOGY
• 5980
SHANNON
ROAD • TUCSON,
ARIZONA
85741 •orUSA
• APPLICATIONS
(800)without
546-2739
SA305U REV 3 FEBRUARY 2006 © 2006 Apex Microtechnology Corp.