Sets DC scaling for external feedback such as tachometers, position sensors or current sensors.
With R4 sets DC operating point of +IN, with R13 and R15 sets gain of voltage feedback circuit.
With R3 sets DC operating point of +IN.
Input scaling of the control signal.
With C6 sets the corner frequency of the integrator.
With C3 & C4 forms a low pass filter for the external feedback loop. Often used with tachometers.
With C2 forms a low pass filter for the current limit circuit.
Current sense. Often is a piece of resistance wire.
With R8 divides shutdown signal voltage feeding SHDN/FILTER pin.
With C5 sets corner frequency for external feedback loop.
Provides voltage feedback for a voltage controlled output.
Helps set gain or scale input voltage levels.
With C12 provides low pass filtering of +IN signal.
Power supply bypass.
With R8 form a low pass filter for the current limit circuit, also filters the SHDN signal.
With R7 forms a low pass filter for the external feed back loop. Often used with tachometers.
With R11 sets corner frequency for external feedback loop.
With R6 sets the corner frequency of the integrator.
Power supply bypass, must have very low ESR in MHz range.
Filters reference or feedback voltage at +IN.
Bypass for the reference voltage.
With R15 and R16 provides low pass filtering of voltage feedback.
With R17 provides low pass filtering of +IN signal.
Provides AC coupling of +IN signal.
Optional flyback diodes.
Input protection zener diodes.
2
EK01U
P r o d u c t I n n o v a t i o nF r o m
EK01
FIGURE 3. PCB
TOP SIDE
R12
M I C R O T E C H N O L O G Y
C4
R7
C3
SHDN
EVAL07 R-C
C2
C10
R14
R9
R11
R2
TACH
B OUT
D3
+Vs
R10
R16
R8
10
1
SIG
R17
R6
C5
C8
R5
-IN
D2
D4
C12
3.00
+IN
A OUT
R15
SA01
C7
D1
C1
C9
C11
R1
REF
OUT
R13
R3
C6
C13
R4
GND
GND
5.00
BOTTOM SIDE
OPEN LOOP OPERATION
R6
C6
+V
S
EA
OUT
3
7
C1
+V
S
A
6
OUT
PWM
B
9
OUT
GND
4
R9
R10
C2
SHDN
SIG
B
OUT
C7
1
–IN
7.5V
5
REF
REF
OUT
C9
R17
–IN
+2.5/+7.5
2
+IN
SA01
EA
A
OUT
C12
SHDN/
I
SENSE
FILTER
10
8
R8
GND
V
IN
Duty Cycle @ A
OUT
2.5V
5V
7.5V
0%
50%
100%
(A – B) =
V
IN
– 5
V
–
I R
2.5 *
S O
*
DSON
EK01U
3
EK01
P r o d u c t I n n o v a t i o nF r o m
VOLTAGE CONTROL
SIG
R5
1
R1
RO
REF
OUT
C9
R17
5
2
–IN
7.5V
REF
+IN
SA01
R3
RI
C8
RF
R13
R6
C6
R12
RF
3
C10
R16
+VS
C1
+VS
A
6
OUT
PWM
B
9
OUT
GND
4
R9
R10
SHDN
SIG
BOUT
C7
EA
OUT
7
EA
AOUT
SHDN/
FILTER
10
I
SENSE
8
R8
(A – B) = V
IN
*
R
F
R
I
R4
RO
GND
C2
C11
R15
POSITION CONTROL
TACH/
FEEDBACK
R7
R2
SIG
R5
R11
R6
C5
1
R1
REF
OUT
C9
R17
5
2
–IN
7.5V
REF
+IN
SA01
R3
R8
R9
R10
C8
+IN
C2
SHDN
SIG
SHDN/
FILTER
10
I
SENSE
8
C6
EA
OUT
3
7
+VS
A
6
OUT
PWM
B
9
OUT
GND
4
AOUT
+REF
C1
C7
+VS
EA
M
BOUT
–REF
R4
GND
SPEED CONTROL
TACH/
FEEDBACK
C3
R7
C4
R11
R6
C6
EA
OUT
3
7
+VS
A
6
OUT
PWM
B
9
OUT
GND
4
R9
R10
C8
+IN
C2
SHDN
SIG
AOUT
M
BOUT
GND
R8
T
+VS
C1
C7
R2
SIG
R5
C5
1
R1
REF
OUT
C9
R17
–IN
7.5V
5
REF
2
+IN
SA01
R3
EA
SHDN/
FILTER
10
I
SENSE
8
R4
4
EK01U
P r o d u c t I n n o v a t i o nF r o m
EK01
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 apex.support@cirrus.com.
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,
copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-
sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent
does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROP-
ERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PROD-
UCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUS-
TOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE
CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES,
BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL
LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.
Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc.
All other brand and product names in this document may be trademarks or service marks of their respective owners.
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ADI Reference Circuit
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