Datasheet SA01 Datasheet (Apex)

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Page 1

–IN +IN

EA OUT

GND

REF

SHDN/ FILTER

B OUT I

SENSE

A OUT

1 2 3 4 5

9 8 7 6

–

LIMIT

FILTER

TOP

VIEW

.1µF C1

PULSE WIDTH MODULATION AMPLIFIER

MICROTECHNOLOGY

HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739

FEATURES

• SINGLE SUPPLY OPERATION

• WIDE SUPPLY RANGE — 16-100V

• 20A CONTINUOUS OUTPUT

• PROGRAMMABLE CURRENT LIMIT

• SHUTDOWN CONTROL

• HERMETIC PACKAGE

•2 IN2 FOOTPRINT

APPLICATIONS

• BRUSH TYPE MOTOR CONTROL

• PELTIER CONTROL

• REACTIVE LOADS

• MAGNETIC COILS (MRI)

• ACTIVE MAGNETIC BEARING

• VIBRATION CANCELLING

DESCRIPTION

The SA01 amplifier is a pulse width modulation amplifier that can supply 2KW to the load. The full bridge output amplifier can be operated from a single power supply over a wide range of voltages. An error amplifier is included which can provide gain for the velocity control loop in brush type motor control applications. Current limit is programmable by a single resistor. A shutdown input turns off all four drivers of the H bridge output. A precision reference output is provided for use in offsetting the error amplifier. The error amplifier can then be scaled for standard input signals. The amplifier is protected from shorts to supply or ground. The H bridge output MOSFETs are protected from thermal overloads by directly sensing the temperature of the die. The 10-pin hermetic power package occupies only 2 square inches of board space and is isolated.

BLOCK DIAGRAM

9 6

B OUT A OUT

SENSE

SHDN/ FILTER

7.5V REF OUT

EA OUT

–IN

+IN

ERROR

AMP

PWM

SUP/

REF

OUTPUT

DRIVERS

CURRENT

LIMIT

AND

SHUTDOWN

CONTROL

SA01

∆

USA BeO

TE949311

TYPICAL APPLICATION

SHDN/ FILTER

OUT

FILTER

.1µF

–IN

7.5V REF

+IN

SA01

SHUT

DOWN

Motor Driver With Tach Feedback

EXTERNALCONNECTIONS Package: PD10/60S

SENSE

PWM

LIMIT

GND

OUT

4810

GND

AS EA OUT (3) GOES MORE POSITIVE, HIGH STATE OF A OUT (6) INCREASES AND HIGH STATE OF B OUT (9) DECREASES.

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]

Page 2

SA01

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +V OUTPUT CURRENT, peak 30A

POWER DISSIPATION, internal 185W TEMPERATURE, pin solder - 10s 300°C TEMPERATURE, junction

100V

150°C TEMPERATURE, storage –65 to +150°C OPERATING TEMPERATURE RANGE, case –55 to +125°C SHUTDOWN VOLTAGE 10V REFERENCE LOAD CURRENT 10mA

SPECIFICATIONS

PARAMETER TEST CONDITIONS

ERROR AMP INPUT ± 0 to +12V

MIN TYP MAX UNITS

ERROR AMP

OFFSET VOLTAGE 10 mV BIAS CURRENT 5 µA OFFSET CURRENT 1 µA COMMON MODE VOLTAGE RANGE COMMON MODE REJECTION, DC SLEW RATE 15 V/µS OPEN LOOP GAIN

+2 +8 V 75 dB

75 dB

GAIN BANDWIDTH PRODUCT 2 MHz

OUTPUT

TOTAL R EFFICIENCY, 10A OUTPUT VS = 100V 97 % SWITCHING FREQUENCY 35.3 42 48.7 KHz CURRENT, continuous CURRENT, peak

20 A 30 A

.25 Ω

REFERENCE

VOLTAGE I VOLTAGE VS. TEMP OUTPUT CURRENT 5mA LOAD REGULATION

= 5mA 7.46 7.50 7.54 V

REF

Full temperature range 50 PPM/°C

20 50 PPM/mA

LINE REGULATION 1 PPM/V

POWER SUPPLY

VOLTAGE Full temperature range 16 50 100 V CURRENT I CURRENT, shutdown I

= 0, I

OUT

= 0 25 mA

REF

= 0 76 90 mA

REF

SHUTDOWN

TRIP POINT .18 .22 V INPUT CURRENT 100 nA

THERMAL

RESISTANCE, junction to case Full temp range, for each transistor 1.0 °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, however the N-channel will be about 1/3 of the total dissipated

power. Internal connection resistance is .05Ω.

2. Unless otherwise noted: TC = 25°C.

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 SA01 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: 1 (800) 546-2739

Page 3

TYPICAL PERFORMANCE

0.1 0.4 1.0 2.0 6.010.0 40.0

0.02

0.06

0.10

0.40

1.00

2.00

6.00

10.0

BRIDGED OUTPUT SWING

VOLTAGE DROP, V

– [A

OUT

–B

OUT

] (V)

–55 125

100

101

NORMALIZED CLOCK DRIFT

OUTPUT CURRENT, (A)

VOLTAGE DROP

VOLTAGE DROP, (V)

–15 25 85 2 4 6 8 10 12 14 16 18 20

NORMALIZED SWITCHING FREQUENCY, (%)

BRIDGE DRIVE CURRENT, I

OUT

(A)

CASE TEMPERATURE, T (°C)

25 125

CASE TEMPERATURE, T

(°C)

MAXIMUM CONTINUOUS OUTPUT

OUTPUT CURRENT , (A)

1 10 100 10M

120

ERROR AMP SMALL SIGNAL GAIN

FREQUENCY, F (Hz)

–180

ERROR AMP SMALL SIGNAL PHASE

45 65 85 105

–55 –50 –25 0 25 50 75 100 125125–15 25 85

1K 10K 100K 1M 1 10 100 10M1K 10K 100K 1M

FREQUENCY, F (Hz)

OPEN LOOP GAIN RESPONSE, A (dB)

–135

–90

–45

OPEN LOOP PHASE, (°)ϕ

INTERNAL POWER DISSIPATION, P (W)

015

FLYBACK CURRENT, ISD, (A)

FLYBACK DIODES

FET ON RESISTANCE

ON RESISTANCE, (Ω)

POWER DERATING

125

100

10 20

.05

.15

.25

SOURCE TO DRAIN DIODE VOLTAGE

CASE TEMPERATURE, T (°C)

50 110 13070 90 150

CASE TEMPERATURE, T (°C)

1000 25 50 125

CASE TEMPERATURE, TC (°C) CASE TEMPERATURE, TC (°C)

QUIESCENT CURRENT DRIFT

QUIESCENT CURRENT, IQ (mA)

0.9996

0.9998

1.0000

1.0002

1.0004

NORMALIZED REFERENCE DRIFT

CONTROL, EA OUT (V)

DUTY CYCLE

PERCENT HIGH

NORMALIZED REFERENCE, V

REF

, (X)

125°C

85°C

25°C

A/B OUT TO +V

P-CHANNEL

OUT

N-CHANNEL

A/B OUT TO I

SENSE

N-CHANNEL

VS = 100V

JUNCTION TEMPERATURE

VS = 80V VS = 60V

VS = 40V

VS = 20V

TJ = 150°C

25°C

EACH OUTPUT TRANSISTOR

CASE TEMP. 35°C

CASE TEMP. 110°C

CASE TEMP. 60°C

CASE TEMP. 85°C

GRAPHS

SA01

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]

Page 4

SA01

OPERATING

CONSIDERATIONS

GENERAL

Helpful information about power supplies, heatsinking and mounting can be found in the “General Operating Considerations” section of the Apex data book. For information on the package outline, heatsinks, and mounting hardware see the “Package Outlines” and “Accessories” section of the data book. Also see Application Note 30 on “PWM Basics.”

CURRENT LIMIT

The current limit function sets a peak limit on current flow in pin 8 (Isense). This limits load current and also limits current in the event of a short of either output to +Vs. This circuit can trip anytime during the conduction period and will hold the output transistors off for the remainder of that conduction period.

For proper operation the current limit sense resistor must be connected as shown in the external connection diagram. It is recommended that the resistor be a non-inductive type. Load current flows in pin 8. No current flows in pin 10 (Shutdown/ filter) so no error will be introduced by the length of the connection to pin 10. However, the voltage at pin 10 is compared to GND (pin 4) and an error could be introduced if the grounded end of R board layout practice would be to connect R tween pins 8 and 4.

is not directly tied to pin 4. Good circuit

LIMIT

directly be-

LIMIT

Switching noise spikes will invariably be found at pin 8. The amplitude and duration will be load dependent. The noise spikes could trip the current limit threshold which is only 200

FILTER

and C

mV. R switching noise well below 200 mV to prevent false current

should be adjusted so as to reduce the

FILTER

limiting. The sum of the DC level plus the noise peak will determine the current limiting value. Suggested starting values are C

= .01µF, R

FILTER

The required value of R

R where R

maximum desired current.

LIMIT

= .2 V / I

LIMIT

is the required resistor value, and I

FILTER

= 5k.

may be calculated by:

LIMIT

is the

SHUTDOWN

The shutdown circuitry makes use of the internal current limiting circuitry. The two functions may be externally combined as shown below in Figure 1. R value resistor and can be considered zero for this application.

and R

After a suitable noise filter is designed for the current limit adjust the value of R when the shutdown signal is high. This means pin 10 will reach

form a voltage divider for the shutdown signal.

FILTER

to give 317 mV of shutdown signal at pin 10

the 200 mV trip point in about one time constant with low output current and less time as output current increases. The voltage

LIMIT

SHDN/FILTER

FILTER

SHUTDOWN

SIGNAL

FILTER

FIGURE 1.

will normally be a very low

LIMIT

at pin 10 is referenced to pin 4 (GND). C will filter both the cur-

rent limit noise spikes and the shutdown signal. Shutdown and current limit operate on each cycle of the internal switching rate. As long as the shutdown

SENSE

signal is high the output will be disabled.

FILTER

PROTECTION CIRCUITS

There are two conditions which will latch all the output transistors off. The first of these conditions is activation of the high side current limit. Specifically, current in pin 7 (+V monitored. The DC trip level is about 35A and response time

) is

about 5us. As actual currents increase the response time decreases. The external fault generally associated with this condition is shorting one of the outputs to ground. However, a load fault can also activate this high side current limit if the current rise time is less than the response time of the filter discussed under “Current Limit”. The second of these conditions is activation of any of the four output transistor overtemperature sensors at about 165°C. Ambient temperature, air flow, amplifier mounting problems and all the previously mentioned high current faults contribute to junction temperature. When either of these protection circuits are activated, the root fault must be corrected and power cycled to restore normal operation.

DEAD TIME

There is a dead time between the on and off of each output. The dead time removes the possibility of a momentary conduction path through the upper and lower transistors of each half bridge output during the switching interval. During the dead time all output transistors are off. Noise or flyback may be observed at the outputs during this time due to the high impedance of the outputs in the off state. This will vary with the nature of the load.

–IN

+IN

.1µF

E/A OUT

TO TACH

SIGNAL

FIGURE 2.

REF OUT

R5 R6

ERROR AMPLIFIER

The internal error amplifier is an operational amplifier. For highest loop accuracy it is best to configure the op amp as an integrator (See Figure 2). Feedback can be adjusted with appropriate poles and zeroes to properly compensate the velocity loop for optimum stability.

The op amp is operated from a single supply voltage generated internally. The non-inverting input of the op amp does not have a common mode range which includes ground. R2 and R7 are used with the reference voltage provided at pin 5 to bias the non-inverting input to +5 volts, which is approximately half of the voltage supplied internally to the op amp. Similarly, R1 and the parallel combination of R5 R6 are selected to bias the inverting input also at +5 volts. Resistors R1 R2 must be matched. Likewise the parallel combination of R5 R6 must be matched with R7. The source impedances of the tach and the signal source may affect the matching and should be considered in the design.

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.