P r o d u c t I n n o v a t i o n F r o m DB63R
DB63RU 1
Demonstration Board for the SA57-IHZ
DB63R
P r o d u c t I n n o v a t i o n F r o m
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
http://www.cirrus.com
FEB 2009
APEX − DB63RUREVA
INTRODUCTION
The DB63R is designed to demonstrate the capabilities of the SA57 DC brush motor driver IC. This fully assembled
demonstration allows the user to directly control the speed and direction of the motor. An onboard circuit controls
the direction and provides four quadrant PWM signals to control the power outputs of the SA57. LEDs provide feed-
back for motor control status and fault indications. Provisions on the DB63R allow the user to bypass the onboard
control circuit and directly interface with the SA57 motor driver.
The DB63R demonstrates proper layout techniques for the
SA57 high current switching amplier. The economical con-
struction uses only a two-sided PCB and allows the SA57 to
deliver peak currents of over 1kW.
THERMAL CONSIDERATIONS:
The SA57 is available in a surface mount package which
can deliver peak power of over 1kW. This presents an obvi-
ous and signicant thermal challenge. The DB63R offers a
compact design which can deliver 17A peak current by using
a patent pending mounting technique. Mounting the SA57 in
an inverted fashion as shown in Figure 1 reduces the pro-
le height of the assembly and provides a direct interface
between the thermal tab of the PowerQuad package (pack-
age outline drawing HQ) and the small HS33 heatsink. The
DB63R assembly can dissipate 7-9W in still air at 25ºC ambi-
ent temperature, depending on the orientation of the heatsink
ns. To use the DB63R in higher power applications, use a
fan or mount a heatsink with larger thermal mass. Although
the SA57 is rated for operation from -25 to +85ºC, the other
components on the DB63R are limited to 0 to 70ºC ambient
temperature.
CIRCUIT OPERATION
The DB63R control circuit receives power via two terminal
block connections. The Vs connection supplies power to
drive the motor and must be above the under-voltage lock-
out threshold of the SA57, approximately 8.3V. The control
circuit requires 12V for proper operation a regulator on the
DB63R provides the 5V logic supply for the SA57. There are
no special considerations for sequencing the two supplies.
Figure 1 – Mounting Technique
PATENT PENDING
P r o d u c t I n n o v a t i o n F r o m
DB63R
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Figure 2 – User Control Features
Figure 2 shows the user control features of the DB63R.
The PWM duty cycle is controlled with the potentiometer
(1 in gure 2). The power LED (2) will illuminate when
the 12V supply is connected. The DB63R will power up
with the SA57 disabled. The enable button (3) will toggle
the SA57 on and off with the LED (4) illuminating to indi-
cate the enable status. Direction of the motor is similarly
controlled with the button (5) and is indicated by the LED
(6).
The DB63R monitors the Temperature warning status pin
of the SA57. If this pin goes high an LED (7) illuminates
and the enable circuit is forced to a disable status. The
temperature LED is not latched and may stay illuminated
only briey while the temperature of the SA57 is above
135ºC. The temperature decrease rapidly via the heatsink
once the SA57 is disabled.
The SA57 current limit feature is set to limit at approxi-
mately 15A to provide a demonstration of the full capabili-
ties of the SA57. An LED (8) will illuminate if the SA57
cycle-by-cycle current limit circuit engages. The thermal
and current limit features are robust, but will not protect
the SA57 in all circumstances. The user must consider the worst case thermal and power dissipation conditions.
Push-button switches 1 and 2 trigger latches (U4) for direction and enable control, respectively. Diodes D7 & D8
and resistors R24, 25, 29 & 30 provide a means of bypassing the DB63R control circuit. The 5V regulator, U3, pro-
vides 5V to the SA57, the latches and the status LEDs.
2
10
5
6
48
3
1
11 7
P r o d u c t I n n o v a t i o n F r o m DB63R
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Figure 3 – Schematic
ENHANCING & BYPASSING THE DB63R CONTROL CIRCUIT:
Connector J5 allows the user to bypass many of the manual control features of the DB63R. A signal generator can
control the duty cycle with a 2.5 to 7.5V signal, overriding the control potentiometer. A rising 5V edge on pin 3 or 4 of
connector J5 will toggle the Direction or Enable latches, respectively. By jumping resistors R24 & R25, the latches
are bypassed completely and the logic signals on pins 3 & 4 will directly control the direction and enable functions of
the DB63R. With these resistors jumped, the direction and enable LEDs will not represent the states of the DB63R
and the pushbuttons will have no effect on the operation. The Temperature disable feature of the DB63R will also
not function, although the LED will continue to provide over-temperature status.
Connector J4 is connected directly to the PWM input pins of the SA57. This connector may be used to monitor the
signals or to bypass the control IC on the DB63R. The enable function is not controlled via these pins, although
pulling all four input pins low provides the same effect. The Enable pushbutton and the connection via J5 are also
effective as previously described. The circuit shown in gure 3 in the dashed box is a simple circuit that allows the
user to monitor and control the enable or direction status remotely. Either feature can be toggled on the falling edge
of the signal at the node labeled TOGGLE.
LAYOUT CONSIDERATIONS
A simple two layer construction is sufcient because of the convenient pinout of the SA57 PowerQuad package.
Input signals are routed into one side of the package and high power output signals are routed from the other side
in 2 ounce copper. This eliminates the need to route control signals near motor connections where noise may cor-
rupt the signals. Filling top and bottom layers with copper reduces inductive coupling from the high current outputs.
1nF capacitors with excellent high frequency characteristics bypass the Vs motor supplies on each phase. Two
150μF electrolytic capacitors provide a local, low inductance source to accommodate surge currents up to 17A.
P r o d u c t I n n o v a t i o n F r o m
DB63R
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Six 100V Schottky diodes conduct the commutation current via low forward voltage paths which reduces the power
dissipation in the SA57. These diodes are rated for 5A continuous and are mounted close to the SA57 to reduce
inductance in the commutating current loop. For applications with continuous currents less than 5A, the Schottky
diodes may not be necessary if the higher forward voltage internal body diodes and the associated power dissipa-
tion are manageable during commutation cycles.
Figure 4 shows the top and bottom layouts of the DB63R. Gerber les for the circuit board are available upon re-
quest.
Figure 4 – PCB Layout (not to scale)
TOP SIDE
BOTTOM SIDE
3.888”
1.860”
P r o d u c t I n n o v a t i o n F r o m DB63R
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BILL OF MATERIALS
Designation Description P/N
C1,C18 CAP, 1.0uF, 16V Kemet, C0805C105K4RAC
C13 CAP, 33pF, 50V Kemet, C0603C330J5GACTU
C2,C3 CAP, 1.0nF,100V Kemet,C0805C102J1GACTU
C5,C6 CAP, 150uF, 100V Panasonic, EEVFK2A151M
C7,C8,C14,C15,C16 CAP, 0.1uF,16V GRM188F51C104ZA01D
C12,C17 CAP, 2.2nF,50V GRM188R71H222KA01D
D1,D2,D3,D5,D6 Diode, 5A Schottky Diodes Inc., DS5100
D7,D8,D9 IN4148 Vishay, 1N4148WS-V-GS08
J4 Conn, 6 pin .100 ctrs Samtec, TSM-106-01-T-SV
J5 Conn, 4 pin .100 ctrs Samtec, TSM-104-01-T-SV
LED1-5 LED, Red Lite-On, LTST-C190CKT
Q1,Q2 XTR, NPN MMBT3904
R11,R12,R13 RES 2.0K, 1% Vishay,CRCW06032K00FKEA
R24,R25 RES, 6.8K Vishay,CRCW06036K80FKEA
R26,R27 RES, 10K Vishay,CRCW060310K0FKEA
R29,R30 RES, 3.3K Vishay,CRCW06033K30FKEA
R18,R19,R20,R21,R32 RES, 1.0K, 5% RK73B1JTTD102J
R7,R31 RES, 24.9K,1/10W, 1% RK73H1JTTD2492F
R8 POT, 20K muRata, PVG3A203C01
R9,R10,R16,R17,R22,R23 RES, 4.99K CRCW06034K99FKEA
SW1,SW2 Pushbutton, SPST-NO Panasonic, EVQ-Q2B01W
TB1,TB2 Terminal Block, 3 pin, 5mm On Shore Tech, OSTTA034163
Thermal Grease Heatsink compound N/A
U1 SA57-IHZ Cirrus Logic, SA57-IHZ
U2 UCC3626 Texas Instruments, UCC3626PW
U3 LM78L05 National Semiconductor, LM78L05ACMX/NOPB
U4 74AC74 Texas Instruments, SN74AC74PW
Heatsink Cirrus Logic, HS33
PCB, 1.75” x 3.75” Cirrus Logic,EVAL69R
Screw, #4-40 x ¼” N/A
Solder Tin/Silver 96/4
DB63R QUICK START GUIDE
1. Connect the following:
Connection Location Indicator Comment
Vs TB2-3 9-60V
Ground TB2-2
Vctrl TB2-1 LED 2 12V
Motor Phase A TB1-1
Motor Phase B TB1-2
2. Apply 12V to Vctrl. LED 2 should light.
3. Apply voltage to Vs based on rated motor voltage, normally 12-48V.
4. Press ENABLE switch 3. LED 4 will light and motor should start.
ORDERING INFORMATION
DB63R Demonstration Board includes one populated EVAL69R PCB and one SA57-IHZ sample.
P r o d u c t I n n o v a t i o n F r o m
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CONTACTING CIRRUS LOGIC SUPPORT
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact tucson.support@cirrus.com.
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To nd the one nearest to you, go to www.cirrus.com
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