Apex SA12 Datasheet

MICROTECHNOLOGY

FEATURE

PULSE WIDTH MODULATION AMPLIFIER

SA12

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• HIGH FREQUENCY SWITCHING — 200 kHz

• WIDE SUPPLY RANGE—16-200V

• 15A CONTINUOUS TO 65°C CASE

• 3 PROTECTION CIRCUITS

• ANALOG OR DIGITAL INPUTS

• SYNCHRONIZED OR EXTERNAL OSCILLATOR

• FLEXIBLE FREQUENCY CONTROL

APPLICATIONS

• REACTIVE LOADS

• LOW FREQUENCY SONAR

• LARGE PIEZO ELEMENTS

• OFF-LINE DRIVERS

• C-D WELD CONTROLLER

DESCRIPTION

The SA12 is a pulse width modulation amplifier that can
supply 3000W to the load. An internal 400kHz oscillator
requires no external components. The clock input stage
divides the oscillator frequency by two, which provides the
200 kHz switching frequency. External oscillators may also be
used to lower the switching frequency or to synchronize
multiple amplifiers. Current sensing is provided for each half
of the H-bridge giving amplitude and direction data. A shut­down input turns off all four drivers of the H-bridge output. A
high side current limit and the programmable low side current
limit protect the amplifier from shorts to supply or ground in
addition to load shorts. The H-bridge output MOSFETs are
protected from thermal overloads by directly sensing the
temperature of the die. The 12-pin hermetic MO-127 power
package occupies only 3 square inches of board space.

BLOCK DIAGRAM AND TYPICAL APPLICATION
TORQUE MOTOR DRIVER

CONTROL

SIGNAL

3/7V

Vcc

+PWM

–PWM/RAMP

CLK OUT

CLK IN

GND

10

3
4

470pF

56K

OSC

2

1

5

÷2

SA12

∆

USA B

949311

eO

TE

EXTERNAL CONNECTIONS

CLK IN

CLK OUT

+PWM

–PWM/RAMP

GND

1
2
3

TOP

TOP

VIEW

VIEW

4
5
6

12
11
10

9
8
7

*

*

ILIM/SHDN

Case tied to pin 5. Allow no current in case. Bypassing of supplies
is required. Package is Apex MO-127 (STD). See Outline
Dimensions/Packages in Apex data book.

If +PWM > RAMP/–PWM then A OUT > B OUT.
*See text.

CURRENT

LIMIT

PWM

OUTPUT

DRIVERS

SHUTDOWN

CONTROL

9

+V

B OUT

8

11

A OUT

I SENSE A

12

6

ILIM/SHDN

7

I SENSE B

S

MOTOR

1K

5K

RSENSE

µF

.01

1K

RSENSE

ISENSE A
A OUT

VCC

+VS

B OUT
I SENSE B

5V

5V

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SA12

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +V
SUPPLY VOLTAGE, V
POWER DISSIPATION, internal 250W
TEMPERATURE, pin solder - 10s 300°C
TEMPERATURE, junction

S

CC

3

200V
16V

150°C

1

TEMPERATURE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –55 to +125°C
INPUT VOLTAGE, +PWM 0 to +11V
INPUT VOLTAGE, –PWM 0 to +11V

SPECIFICATIONS

INPUT VOLTAGE, I

PARAMETER TEST CONDITIONS

LIM

2

MIN TYP MAX UNITS

0 to +10V

CLOCK (CLK)

CLK OUT, high level
CLK OUT, low level
FREQUENCY 392 400 408 kHz

4

4

I

≤ 1mA 4.8 5.3 V

OUT

I

≤ 1mA 0 .4 V

OUT

RAMP, center voltage 5V
RAMP, P-P voltage 4V
CLK IN, low level
CLK IN, high level

4

4

0.9V

3.7 5.4 V

OUTPUT

TOTAL R
EFFICIENCY, 10A output VS = 200V 97 %
SWITCHING FREQUENCY OSC in ÷ 2 196 200 204 kHz
CURRENT, continuous
CURRENT, peak

ON

4

4

4

65°C case 15 A

20 A

.4 Ω

POWER SUPPLY

VOLTAGE, V
VOLTAGE, V
CURRENT, V
CURRENT, V
CURRENT, V

I

/SHUTDOWN

LIM

S
CC

CC

shutdown 50 mA

CC,
S

Full temperature range 16 120 200 V
Full temperature range 14 15 16 V
I

= 0 80 mA

OUT

No Load 200 mA

TRIP POINT 90 110 mV
INPUT CURRENT 100 nA

THERMAL

3

RESISTANCE, junction to case Full temperature range, for each die 1 °C/W
RESISTANCE, junction to air Full temperature range 12 °C/W
TEMPERATURE RANGE, case Meets full range specifications –25 +85 °C

NOTES: 1. Each of the two active output transistors can dissipate 125W.

2. Unless otherwise noted: TC = 25°C, VS, VCC at typical specification.

3. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power
dissipation to achieve high MTTF. For guidance, refer to the heatsink data sheet.

4. Guaranteed but not tested.

CAUTION

The SA12 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush,

machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes.

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]