CIRRUS SA305_07

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SA305
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M I C R O T E C H N O L O G Y
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.
23 Pin SIP
Package Style EX
EXTERNAL CONNECTIONS
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
SA305
BLOCK
DIAGRAM
DETAILED BLOCK DIAGRAM (1 PHASE SHOWN)
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TYPICAL APPLICATION
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 • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
SA305
PIN
DESCRIPTIONS
Pin Descriptions
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Pin #
10,21
17
22
13
2
1,23
11
19
Pin name
Vs Vdd
OutA
OutB
OutC
PGND
SGND
DISABLE
18
Warning
8
FAULT
16
PWM_HA
15
PWM_LA
12
PWM_HB
14
PWM_LB
7
PWM_HC
5
PWM_LC
20
IMON_A
3
IMON_B
4
IMON_C
9
OFF
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 and makes the FAULT output high.
Do not leave floating at any time.
Output pin goes high if Tj rises above 135°C and goes low again if TJ falls below 85°C.
The output pin is high under the following conditions:
a) Short-Circuit and Over Current condition.
b) When TJ rises above 160°C until it falls below 110°C.
c) When VS rises above 9.8V until it falls below 9.7V.
d) Disable pin is activated (pulled high)
This can be used as an interrupt to the microcontroller.
CMOS logic input: When HIGH, indicates the Pchannel of output A is to be turned on.
CMOS logic input: When HIGH, indicates the Nchannel of output A is to be turned on.
CMOS logic input: When HIGH, indicates the Pchannel of output B is to be turned on.
CMOS logic input: When HIGH, indicates the Nchannel of output B is to be turned on.
CMOS logic input: When HIGH, indicates the Pchannel of output C is to be turned on.
CMOS logic input: When HIGH, indicates the Nchannel of output C is to be turned on.
Current monitor output, approximate current 1/4100 of Phase A current
Current monitor output, approximate current 1/3500 of Phase B current
Current monitor output, approximate current 1/3800 of Phase C current
I/O Pin. Disables all Fault Mechanisms (except under voltage lockout) when pulled LOW. Can be used as a
latched fault output but does not indicate undervoltage lockout. Leave this pin floating for normal operation.
Do not pull HIGH.
All inputs are CMOS levels. Inputs can accept CMOS levels as low as 3.3 volts. CMOS logic inputs cannot be left floating
at any time.
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
SA305
ABSOLUTE MAXIMUM RATINGS
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SUPPLY VOLTAGE, +Vs
SUPPLY VOLTAGE, Vdd
OUTPUT CURRENT, peak, 200ms
POWER DISSIPATION, internal, DC
TEMPERATURE, pin solder, 10s
TEMPERATURE, junction2
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE, case
VOLTAGE AT CMOS INPUTS
60V
5.5V
10A
130W
225°C
150°C
−55 to +125°C
−40 to +125°C
-0.3 to +5.5V
SPECIFICATIONS
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL INPUTS
Logic Low Voltage
1
Logic High Voltage
1.8
Pulsewidth
200
V
V
nS
DIGITAL OUTPUTS
Source Current
0.4
mA
60
5.5
35
V
V
mA
6
mA
1.5
5
%
%
POWER SUPPLY
Vs
9.8
Vdd
4.5
5
Supply Current, Vs
10 KHz (One channel switching
8.5
at 50% duty cycle), Vs=50V,
Vdd=5V
Supply Current, Vdd
10 KHz (One channel switching
4
at 50% duty cycle), Vs=50V,
Vdd=5V
ANALOG
Current Sense Linearity
Current Sense Linearity
Iout = 1A to 5A
0.6
Iout = 100mA to 5A
OUTPUT
Output Current, continuous
5
Output Current, Peak
For 200ms
10
Turn on delay
183
Turn off delay
240
Switching time, on
47
Switching time, off
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
300
Thermal Shutdown
155
160
165
Thermal Warning
135
Overcurrent Shutdown
10
12
A
A
nS
nS
nS
nS
mΩ
mΩ
nS
°C
°C
A
THERMAL
RESISTANCE, junction to case
Full temperature range
0.95
RESISTANCE, junction to air
Full temperature range
12.21
TEMPERATURE RANGE, case
−40
125
°C/W
°C/W
°C
NOTES: 1. Unless otherwise noted: TC=25°C, power supply voltage is typical rating. (Vs = 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.
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 prodlit@apexmicrotech.com
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
OPERATING
CONSIDERATIONS
GENERAL
POWER SUPPLY BYPASSING
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.
Bypass capacitors to power supply terminals +Vs and –Vs
must be connected physically close to the pins to prevent local 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.
GROUND PINS
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: ISENSE_A = IO /4148 + 25µA
CHANNEL B: ISENSE_B = IO /3491 + 30µA
CHANNEL C: ISENSE_C = IO /3819 + 35µA
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.
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 go “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 off the die and package may be required
to dissipate a large amount 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 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 (a brief 200ns or more
pulse should suffice) to reset the SA305 and resume normal
operation. However, before resetting the SA305 the user has to
ensure that the FAULT has been eliminated. Please note that
under voltage lockout does not set the internal fault latch.
CONTROL
Each output MOSFET 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 one half bridge be on.
CURRENT SENSE
EXTERNAL SCHOTTKY DIODES
External schottky diodes are required because of superior
reverse recovery characteristics compared to the internal
body diodes.
SA305 OPERATION
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.
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
SA305
OPERATING
CONSIDERATIONS
CURRENT SENSE LINEARITY CALCULATION
The warning temperature setting is fixed at TJ = 135°C.
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 85°C.
The Fault temperature setting is fixed at TJ = 160°C. Once
the Fault temperature has been reached the Fault Output goes
high and the outputs of the device are latched off. This output
can be used as a microcontroller interrupt. The latch will not
be reset until the temperature is below 110°C.
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.
The current sense linearity is calculated using the method
described below:
a)Define straight line (y = mx + c) joining the two end data
points where, m is the slope and c is the offset or zero
crossover. Calculate the slope m and offset c using the
extreme data points. Assume Isense in the y axis and Iload
in the x axis.
b)Calculate linear Isense (or ideal Isense value, ISIDEAL) using
the straight line equation derived in step (a) for the Iload
data points.
c) Determine deviation from linear Isense (step (b)) and actual
measured Isense value (ISACTUAL) as shown below:
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This
dataMICROTECHNOLOGY
sheet has been carefully CORPORATION
checked and is believed
to be reliable,
no responsibility
assumed for
possible inaccuracies
omissions.
All specifications HOTLINE:
are subject to1change
without
notice.
APEX
• 5980
NORTHhowever,
SHANNON
ROAD • isTUCSON,
ARIZONA
85741 •orUSA
• APPLICATIONS
(800)
546-2739
SA305U REV D AUGUST 2007 © 2007 Apex Microtechnology Corp.