APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739

2

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

EK22

It also maybe necessary to bypass the SCin line with a

22pF - 50pF ceramic capacitor. This bypass capacitor will

add a time delay to the short circuit protection. However this

additional time delay has not resulted in failure during design

verification testing of the short circuit protection. The short

circuit protection may be disabled entirely by grounding the

SCin pin to SGND. Cycle by cycle current limiting will still be

active if a current limit resistor is connected from ISEN to

SGND. Please refer to the SA56 data sheet for selection of

the current limit resistor.

The SA56 prototypes have an extended blocking period

in the ISEN output. This blocking period can be several hun-

dreds of nano-seconds. This is a limitation of this feature for

the SA56 prototypes that will be corrected in the production

SA56 when released.

In 2 quadrant mode of operation, one half bridge of the

SA56 is held low while the other half bridge is modulated.

This means that no current is sensed at the ISEN pin during

the low portion of the output modulation. The ISEN output is

not useful for configuring a transconductance amplifier in 2

quadrant operation.

BEFORE YOU GET STARTED

• All Apex amplifiers should be handled using proper ESD

precautions.

• Do not change connections while the circuit is powered.

• Initially set all power supplies to the minimum operating

voltage allowed in the device data sheet.

• The power supply turn on sequence for the SA56 is VS

supply on first followed by the VDD supply. If VDD is turned

on before VS, the SA56 will start up in a fault condition that

can not be reset until VS is greater then 12V.

PARTS LIST

--

Ref. ApexP/N

Description/Vendor

Qty.

NA

HS20

Heat Sink

1

NA

MS11

Strip of 30 Cage Jacks

1

NA

EVAL25

PC board

1

BJ1-12 BJ1

Banana Jack/

12

Deltron 571-0100

BN1, 2 146510CJ

BNC, PCB mount R/A

2

Jameco 146510CJ

C1-3

OX7R105KWN

1 µF cap

3

Novacap 1825B105K201N

C9, 10 C062K153K1X5CA 15 nF cap

2

D1-4

SB5100

Diode, 100V, 5A

4

R3a-4b 286-20

Resistor, 20 ohm, 5W

4

TB1

PTC07DAAN

Header 2x7 pin

1

J1-3

STC02SYAN

Jumper, shorting

3

NA

TW12

Thermal Washer

1 box

figuRe2shemAtic