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Part: EK17
Category:
Others
Description: Evaluation Kit For Sa12 PWM Amplifier
Company: Apex Microtechnology Corporation
Datasheet: Download EK17 datasheet File size : 74 kB
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Datasheet text preview:
EVALUATION KIT FOR SA12 PWM AMPLIFIER
EK17
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
INTRODUCTION
This easy-to-use kit provides a platform for the evaluation of PWM amplifiers using the SA12 pin-out configuration. It can be used to analyze a multitude of standard or proprietary circuit configurations, and is flexible enough to do most standard amplifier test configurations. The schematic is shown in Figure 2. Note that all of the components shown on the schematic will probably not be used for any single circuit. Some components will simply be omitted, while others require installation of a jumper to complete the signal path. Only components unique to the EK17 are provided in this kit. Hardware similar to that shown in Figure 1 must be obtained locally.
PARTS LIST
Apex Part # HS18 MS04 EVAL19 60SPG00001 TW05 OX7R105KWN TS01 EC03 Description Heatsink PC mount Cage Jacks PC Board Spacer Grommets Thermal Washer 1µF Cap 1825B105K201N, Novacap Terminal Strip 66505 Beau Interconnect 680 µf Cap United Chemi-Con KMH200VN68IM25X40T2 Heatsink Thermolly 6025B 0.01 ohm resistor Caddock MP916-0.010 - 5% 0.020 ohm resistor Caddock MP930-0.020 - 5% Quantity 1 1 Bag/12 each 1 4 1 Box/10 each 3 1 1
BEFORE YOU GET STARTED
* All Apex amplifiers should be handled using proper ESD precautions. * Always use the heatsink included in this kit with TW05 washer. * Always use adequate power supply bypassing. * Do not change connections while the circuit is powered. * Initially set all power supplies to the minimum operating allowed in the device data sheet.
HS22 CSR03 CSR04
2 2 2
FIGURE 1.
APEX MICROTECHNOLOGY CORPORATION · TELEPHONE (520) 690-8600 · FAX (520) 888-3329 · ORDERS (520) 690-8601 · EMAIL prodlit@apexmicrotech.com
EK17
ASSEMBLY During assembly refer to Figure 1
1. From the DUT of the PCB insert and solder the 12 cage jacks. Also solder the cage jacks from the circuit side as well, making sure the cage jack remains flush with the component side of the PCB. 2. Solder the 3 surface mount ceramic capacitors to the component side of the PCB. 3. From the component side of the PCB insert the terminal strip. Solder from the circuit side of the PCB. Be sure that the GND terminal hole in the PCB is fully filled with solder. 4. Two values of current limiting power resistors are supplied. Select one value (see the amplifier data sheet to learn how to calculate which resistor will suit your need). Coat the backside of the power resistor with heat sink compound (not supplied). Using 4-40 screws and nuts (not supplied) mount the resistors to the two small heat sinks supplied. Solder the resistor/heat sink assembly to the component side of the PCB. 5. Insert the electrolytic capacitor into the PCB from the component side and solder from the circuit side making sure to fill the mounting holes with solder. 6. From the circuit side, push spacer grommets into PCB until fully seated. Grommets will snug when screws are inserted for heatsink mounting. 7. Apply TW05 thermal washer to the bottom of the amplifier. 8. Use #14 sleeving to insulate and align at least 2 opposite pins of the amplifier. 9. Mount amplifier to heatsink using #6 screws and nuts. Torque the part to the specified 8 to 10 in-lbs (.9 to 1.13 N*M). Do not over torque. 10. Install components as needed. External connections may be soldered directly or standard banana jacks may be soldered to the large pads at the edge of the PCB. 11. Insert amplifier pins into cage jacks and fasten PCB to heatsink.
EVALUATION KIT FOR SA12 PWM AMPLIFIER
APEX MICROTECHNOLOGY CORPORATION · 5980 NORTH SHANNON ROAD · TUCSON, ARIZONA 85741 · USA · APPLICATIONS HOTLINE: 1 (800) 546-2739
EVALUATION KIT FOR SA12 PWM AMPLIFIER
EK17
FIGURE 2. PCB SCHEMATIC.
A OUT TS1 CVcc Ra R2
Vcc TS1
+ Vs TS1
B OUT TS1
CVs1-3 R1
12
11
A OUT
10
Vcc
9
+ Vs
8
B OUT
7
I SENSE B
I SENSE A
5V .1V 1k 1000pf 50k 50 910 .01µF Vcc 10V 10V
H BRIDGE DRIVER
A block diagram of the SA12 is shown in Figure 2 along with 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 connections. 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 addition, 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, operating 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.
SA12
10V 5V 28.1k f/2 100pF 5V
CLOCK
CLK IN
CLK OUT
+ PWM
PWM
GND ILim/SHDN
1
J1
2
3
C1
4
C2
5
6
C3 R3
R4
D1 TS1
+PWM
RAMP/-PWM OR FLAG
SIG GND
PWR GND
SHDN
APEX MICROTECHNOLOGY CORPORATION · TELEPHONE (520) 690-8600 · FAX (520) 888-3329 · ORDERS (520) 690-8601 · EMAIL prodlit@apexmicrotech.com
EK17
FIGURE 3. FUNCTIONAL TEST CIRCUIT
EVALUATION KIT FOR SA12 PWM AMPLIFIER
50 OHM 25 WATT DUMMY LOAD
15V 200 mA SUPPLY
30V HIGH AMP SUPPLY
A OUT
Vcc
+ Vs
B OUT
The schematic of Figure 3 can be used to verify the functionality 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 10 amps.
TS1
CVcc 1 µF
TS1
TS1
TS1
Rb .02 OHM R1 5k
Ra .02 OHM R2 5k
CVs1-3
12
11
10
A OUT Vcc
9
+ Vs
8
B OUT
7
I SENSE B
I SENSE A
5V
1k 1000pf 50 910 .01µF
10V 50k Vcc
H BRIDGE DRIVER
.1V
10V
SA12
10V 5V f/2 28.1k
100pF
5V
CLOCK
CLK IN
CLK OUT
+ PWM
FLAG
GND
ILim/SHDN
1
J1
2
3
C1 .01F
4
5
6
5K
C3 .1F
50
TS1
+PWM RAMP/-PWM SIG OR GND FLAG PWR GND
D1
SHDN
1 Hz SINE WAVE +3/+7 V AMPLITUDE VALLEY TO PEAK
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice. EK17U REV. B JUNE 2000 © 2000 Apex Microtechnology Corp.
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