EK15 Cirrus Logic Inc, EK15 Datasheet - Page 3

• Manufacturer Part Number: EK15
• Description: EVALUATION KIT FOR SA08
• Manufacturer: Cirrus Logic Inc
• Series: Apex Precision Power™r

Specifications of EK15

• Main Purpose: Power Management, H Bridge Driver (Internal FET)
• Embedded: No
• Utilized Ic / Part: SA08
• Primary Attributes: 16 V ~ 450 V Supply, 20A Output
• Secondary Attributes: Assembly Required
• Product: Amplifier Modules
• Description/function: Audio Amplifiers
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 598-1460; EK15

pcb connections of all the commonly used external components.
Your application circuit will not use all of the components. Add
those components required by your circuit. You may have to
jumper some components to make the desired electrical connec-
tions. J1 is an optional way to connect the clock circuit. Power
supply bypassing is particularly important and that is why high
quality ceramic chip capacitors are supplied with the kit. In ad-
dition, a large electrolytic capacitor is included. This capacitor
was selected expressly for this evaluation kit and may not be
(and likely won't be) suitable for your end application. You will
need to select an electrolytic capacitor based on your analysis
of the capacitor's ripple current, ripple current tolerance, operat-
ing temperature, operating voltage, acceptable service life and
acceptable supply ripple. Note that the signal ground and power
ground are separated and tie together only at the ground pin (5).
A breadboarding area is supplied which can accomodate 1 or
2 IC amplifiers and associated components. The large terminal
pads can be used to solder wire connections or bannana jacks.
FIGURE 3. PCB SCHEMATIC.
EK15U
A block diagram of the SA08 is shown in Figure 2 along with
12
1000pf
1
1k
50
I SENSE A
CLK IN
Ra
R2
TL
5V
910
.01µF
J1
.1V
A OUT
10V
f/2
11
2
CLK OUT
50k
A OUT
10V
CLOCK
10V
470pF
56k
5V
Vcc
CVcc
5V
R4
+PWM
Vcc
10
BRIDGE
DRIVER
3
P r o d u c t I n n o v a t i o n F r o m
Vcc
+ PWM
H
C1
CVs1-3
RAMP/-PWM
+ Vs
FLAG
OR
9
4
FLAG
+ Vs
C2
SA08
B OUT
GND
SIG
8
5
GND I Lim /SHDN
B OUT
R1
PWR
7
GND
I SENSE B
6
R3
C3
I LIM /SHDN
D1
tionality of your amplifier and help you gain a familiarity with
proper operation. At either A Out or B Out, with respect to
ground, you should observe a square wave approximately 30
V in amplitude with a fixed frequency and duty cycle that varies
from approximately 0 to 100% at a rate of 1 Hz. The current
limit is set to 2 amps.
FIGURE 3. FUNCTIONAL TEST CIRCUIT
The schematic of Figure 3 can be used to verify the func-
1000pf
12
1
1k
50
I SENSE A
.1 OHM
TL
CLK IN
5V
Ra
R2
5k
910
J1
.01µF
.1V
A OUT
10V
f/2
11
2
CLK OUT
10V
10V
470pF
A OUT
50k
CVcc
5V
Vcc
SUPPLY
1µF
56k
200 mA
5V
15V
50
50 OHM 25 WATT
+3/+7 V AMPLITUDE
+PWM
DUMMY LOAD
1 Hz SDNE WAVE
VALLEY TO PEAK
Vcc
10
3
+ PWM
Vcc
CVs1-3
.01µF
C1
RAMP/-PWM
30V HIGH
+ Vs
SUPPLY
OR
FLAG
4
9
AMP
+ Vs
FLAG
B OUT
GND
SA08
SIG
5
8
GND
.1 OHM
B OUT
Rb
R1
5k
PWR
GND
7
6
I Lim /SHDN
I SENSE B
5K
.1µF
C3
I LIM /SHDN
D1
EK15
3