CIRRUS SA56

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FEATURES
• DELIVERS UP TO 5A CONTINUOUS OUTPUT
• OPERATES AT SUPPLY VOLTAGES UP TO 60V
• TTL AND CMOS COMPATIBLE INPUTS
• NO “SHOOT-THROUGH” CURRENT
• THERMAL SHUTDOWN (OUTPUTS OFF) AT 160°C
• SHORTED LOAD PROTECTION (to VS or PGND or
SHORTED LOAD)
• NO BOOTSTRAP CAPACITORS REQUIRED
• PROGRAMMABLE ONBOARD PWM
23 Pin SIP
Package Style EX
APPLICATIONS
• DC MOTOR DRIVES
• POSITION AND VELOCITY SERVOMECHANISMS
• FACTORY AUTOMATION ROBOTS
• NUMERICALLY CONTROLLED MACHINERY
• COMPUTER PRINTERS AND PLOTTERS
• AUDIO AMPLIFICATION
DESCRIPTION
FIGURE 1. BLOCK DIAGRAM
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The SA56 is a 5A PWM Amplifier designed for motion control applications. The device is built using a multi-technology
process which combines bipolar and CMOS control circuitry
with DMOS power devices in the same monolithic structure.
Ideal for driving DC and stepper motors; the SA56 accommodates peak output currents up to 10A. An innovative circuit
which facilitates low-loss sensing of the output current has
been implemented. On board PWM oscillator and comparator
are used to convert an analog signal into PWM direction and
magnitude for motor control applications, or to amplify audio
signals using class D amplification.
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]microtech.com
SA56
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, VDD
SUPPLY VOLTAGE, VS
PEAK OUTPUT CURRENT (100mS)
CONTINUOUS OUTPUT CURRENT
POWER DISSIPATION
POWER DISSIPATION (TA = 25°C, Free Air) JUNCTION TEMPERATURE, TJ(MAX)
ESD SUSCEPTIBILITY (Logic Signals Only)
STORAGE TEMPERATURE, TSTG
LEAD TEMPERATURE (Soldering, 10 sec.)
JUNCTION TEMPERATURE, TJ
5.5V
60V
10A
5A
TBD
3W
150°C
1500V
–40°C to +150°C
300°C
–40°C to +150°C
SPECIFICATIONS
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
60
5.5
0.6
V
V
Ω
0.6
Ω
TBD
0.8
V
V
+10
VDD
µA
V
10
350
1.5
±5
±8
±8
µA
µA
mA
%
%
%
160
12
TBD
6
15
61
66
51
51
59
54
70
70
100
°C
mA
mA
ns
ns
ns
ns
ns
ns
ns
ns
ns
VS
12
VDD
4.5
SWITCH ON RESISTANCE, RDS(ON)
Output Current = 5A
0.25
N-Channel
SWITCH ON RESISTANCE, RDS(ON)
Output Current = 5A
0.3
P-Channel
CLAMP DIODE FORWARD DROP, VCLAMP
Clamp Current = 5A
1.43
LOGIC LOW INPUT VOLTAGE, VIL
-0.5
LOGIC LOW INPUT CURRENT, IIL
VIN = –0.1V
-10
LOGIC HIGH INPUT VOLTAGE, VIH
2
LOGIC HIGH INPUT CURRENT, IIH
CURRENT SENSE OUTPUT
CURRENT SENSE LINEARITY
A
VIN = 5.5V
-10
IOUT = 1A
300
IOUT = 5A
1.3
1A ≤ IOUT ≤ 5A
±1
100 mA ≤ IOUT ≤ 5A
5A ≤ IOUT ≤ 10A (Peak Currents only)
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SHUTDOWN TEMPERATURE, TJSD
Outputs Turn OFF
QUIESCENT SUPPLY CURRENT, IS
No Load, FSW = 23KHz 50% DUC
QUIESCENT SUPPLY CURRENT, IDD
No Load, FSW = 23KHz 50% DUC
OUTPUT TURN-ON DELAY TIME, tDon
Sourcing Outputs, IOUT = 1A Sinking Outputs, IOUT = 1A OUTPUT TURN-ON SWITCHING TIME, ton Sourcing Outputs, IOUT = 1A Sinking Outputs, IOUT = 1A
OUTPUT TURN-OFF DELAY TIMES, tDoff
Sourcing Outputs, IOUT = 1A Sinking Outputs, IOUT = 1A OUTPUT TURN-OFF SWITCHING TIME, toff Sourcing Outputs, IOUT = 1A Sinking Outputs, IOUT = 1A
MINIMUM INPUT PULSE WIDTH, tp
(DIGITAL MODE)
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PWM FREQUENCY (DIGITAL MODE)
500
KHz
REFERENCE VOLTAGE
2.6
V
1
mA
4
V
800
ns
R
Vref OUTPUT CURRENT (Vref 2.5V)
P
2.4
2.5
Source Only, No current sink capability
ANALOG INPUT RANGE FOR Load Current = 400µA
1
FULL MODULATION
HIGH CURRENT SHUTDOWN RESPONSE Output shorted
250
(No bypass capacitor at SCin pin)
NOTE: These specifications apply for VS = 50V and VDD = 5V at 25°C, unless otherwise specified.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
SA56
TYPICAL
PERFORMANCE GRAPHS
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SA56
TYPICAL
PERFORMANCE GRAPHS
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SA56
OPERATING
CONSIDERATIONS
GENERAL
7
TLIM
Please read Application Note 1 "General Operating Considerations" which covers stability, power supplies, heat sinking,
mounting, 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
There are 4 GND pins. Pins 9 & 10 are for input signal GND
and pins 1 and 23 are for power gnd.
8
POWER SUPPLY BYPASSING
Bypass capacitors to power supply terminals Vs and VDD
must be connected physically close to the pins to prevent
erratic, low efficiency operation and excessive ringing at the
outputs. Electrolytic capacitors, at least 10µF per output amp,
are required for suppressing Vs to PGND noise. High quality ceramic capacitors (X7R) 1µF or greater should also be
used. Only capacitors rated for switching applications should
be considered.
The bypass capacitors must be located as close to the power
supply pins as possible (due to the very fast switching times
of the outputs, the inductance of 1 inch of circuit trace could
cause noticeable degradation in performance). The bypassing
requirements of VDD are less stringent, but still necessary. A
0.1µF to 0.47µF capacitor connected directly between the VDD
and GND (SIG) pins will suffice.
9,10
11
12
PIN DESCRIPTIONS
Pin #
1,23
Name
PGND
2,3 Bout
4,5,19,20VS
6
SCin
Description
Power ground, high current ground
return path of the motor.
Half bridge output B
High voltage supply
Short circuit detect, CMOS. This pin
can be used as a flag for a short circuit condition. Under normal operation
this pin will be logic low. When a short
circuit is detected, or output current
exceeds approximately 10A, this pin
will change to logic high and the output
will be latched off. Grounding this pin
disables short circuit protection. This
pin should be left open if short circuit
protection is desired but the flag is not
used. Short circuit protection functions
independently of programmable current
limit (ISEN). It is nessesary to bypass
the SCin pin with a 14-47pF ceramic
capacitor. This capacitor will add a delay to the short circuit response but the
device will still be able to protect itself
against short circuit and over current.
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16
Temperature limit, CMOS. This pin can
be used as a flag for an over temperature
condition. Under normal operation this
pin will be logic low. When junction temperature exceeds approximately 160°C
this pin will change to logic high and
the output will be latched off. Grounding this pin disables over temperature
protection. This pin should be left open
if over temperature protection is desired
but the flag is not used.
ISEN/ /ILIMCurrent Sense output and programmable current limit. A current proportional to output current is sourced by
this pin. Typically this pin is connected
to a resistor for programmable current
limit or transconductance operation.
GND(Sig) Ground connection for all internal digital
and low current analog circuitry.
FAULT
Protection circuit flag output, CMOS.
The fault pin will be logic high when the
output MOSFETs have been automatically latched off because of a short circuit
or over temperature condition. This pin
should be left open if not used.
CPWM
An external timing capacitor is connected
to this pin to set the frequency of the
internal oscillator and ramp generator
for analog control mode. The capacitor value (pF) = 4.05x107/FSW, where
FSW = the desired switching frequency.
This pin is grounded for digital control
mode.
VDD
5V supply for input logic and low voltage
analog circuitry.
VREF
Reference voltage. Can be used at
low current for biasing analog loop
circuits.
DIR
Direction logic input, CMOS/TTL. Determines the active output MOSFETs
in two quadrant digital control mode.
This pin should be grounded for analog
control mode.
PWM
CMOS/TTL input for digital PWM control, or 1-4V analog input for duty cycle
control in analog control mode.
DISABLE Disable logic input, CMOS/TTL. Logic
low on this pin allows the SA56 to function normally. When pulled to logic high,
all four output MOSFETs are disabled.
Pulling this pin high, then low will reset
a latched fault condition caused by a
short circuit or over temperature fault.
Aout
Half bridge output A
17
18
21,22
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
SA56
OPERATING
CONSIDERATIONS
MODES OF OPERATION
2 QUADRANT DIGITAL MODE
The following chart shows the four modes of operation.
Mode
CPWM
PWM
DIR
Aout
Bout
2
Quad
Digital
GND
Modulation
In
High
High
PWM
2
Quad
Digital
GND
Modulation
In
Low
PWM
High
4
Quad
Digital
GND
High
Modulated
In
DIR
DIR
4
Add
Drive
Quad Cap. to
with
Analog
set
analog
Fresignal
quency
Not
used
but
GND
Greater
Greater
than 50% than 50%
high for a high for a
low
high
input
input
For sign/magnitude (2 quadrant) operation, two digital input
signals are required. A digital PWM signal to the PWM pin can
control the output duty cycle at one output pin with the other
output pin held "HIGH". The digital input on the DIR pin will
control direction by selecting the outputs that switch according to the PWM input. If DIR is a logic "HIGH", the A output
will be held "HIGH" and the B output will be switched as the
inverse of the PWM input signal. If DIR is logic "LOW", the B
output will be held "HIGH" and the A output will be switched.
Operating in 2 quadrant mode reduces switching noise and
power dissipation, but limits the control of the motor at very
low speed.
A braking function can be achieved by holding the PWM input
"LOW", which will turn both of the upper MOSFETs on, rapidly
reducing the circulating current of the motor winding.
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OPERATING WITH DIGITAL INPUTS
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Two and 4 quadrant operation are possible with the SA56
when driven with a digital PWM signal from a microcontroller or
DSP. When using a digital modulation signal, tie the CPWM pin
to GND to disable the internal oscillator and ramp generator.
When operating in the digital mode, pulse widths should be
no less than 100ns and the switching frequency should remain
less than 500KHz. This will allow enough time for the output
MOSFETs to reach their full on/off state before receiving a
command to reverse state.
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During 4 quadrant operation a single digital PWM input includes magnitude and direction information. The digital PWM
input signal is applied to the DIR pin and the PWM/INPUT pin
is tied to "HIGH". Both pairs of output MOSFETs will switch
in a locked anti-phase fashion from 0-100% duty cycle. With
a 50% duty cycle the average voltage of each output will be
half of Vs, and the differential voltage applied to the load will
be zero. Four quadrant operation allows smooth transitions
through zero current for position servos and low speed applications. Power dissipation is slightly higher since all four
output MOSFETs switch every cycle.
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The SA56 can operate with analog or digital inputs. In the
analog mode, the capacitor from CPWM to GND (SIG) sets
the frequency of an internal triangular ramp signal. An analog
input at the PWM pin is compared to the ramp to generate
the duty cycle of the output. In Analog mode, the digital input
on the DIR pin is ignored, though this pin should never be
left floating.
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APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
SA56
OPERATING
CONSIDERATIONS
PROTECTION CIRCUITS
CURRENT SENSE LINEARITY CALCULATION
Thermal and short circuit protection are included in the
SA56 to prevent damage during fault conditions. High current
protection circuits will sense a direct short from either output
to GND or Vs as well as across the load. 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 SC or TLIM
output will also go "HIGH", to indicate which of the protection
features has been triggered. The fault going high disables the
4 output transistors. To reset the fault condition, cycle the VDD
power or bring the DISABLE pin "HIGH" then "LOW".
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
within 250ns (typical) the die and package may be required
to dissipate up to 600 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 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:
PROGRAMMABLE CURRENT LIMIT
The ISEN pin sources a current proportional to the forward
output current of the active P channel output MOSFET. The
proportionality is 300µA (nom) per ampere of output current.
The ISEN output is blocked during the switching transitions
when current spikes can be significant.
To create a programmable current limit, connect a resistor from ISEN out to GND. When the voltage across this
resistor exceeds internally generated 2.75V threshold, all 4
output MOSFETs will be turned off for the remainder of the
switching cycle. A 2.75KΩ resistor will set the current limit to
approximately 5 Amps.
The ISEN output can also be used for maintaining a current
control loop in torque motor applications.
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IC rev C errata information
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This document describes the errata information for SA56 rev
C full H-Bridge DC motor driver. Rev C parts can be identified
by date code 0206 marked on the EX package.
Errata Number Description
and Date
1
Dated: 3/3/06
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TLIM pin:
This pin is modified to serve
as a flag for
any fault occurrence including
short-circuit,
over current
and over temperature.
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Impact
Impact:
Grounding the TLIM pin
disables all fault protection mechanisms in the
SA56 including SC, over
current and over temp.
This pin should be left
floating at all times unless the user desires
to disable all protection
mechanisms.
Note: The errata items described in the table above are
strictly for beta samples and will be rectified to conform to
SA56U specifications for the production parts.
APEX
MICROTECHNOLOGY
• TELEPHONE
(520)
690-8600
• FAX (520)
888-3329
ORDERS (520)
690-8601
• EMAILare
[email protected]
This data
sheet has been carefullyCORPORATION
checked and is believed
to be reliable,
however,
no responsibility
is assumed
for possible• inaccuracies
or omissions.
All specifications
subject to change without notice.
SA56U REV 10 MARCH 2006 © 2006 Apex Microtechnology Corp.