APEX PA98

����������������������������
������������
��������������������������������������������������������������
� � � � � � � � � � � � � � �
FEATURES
• HIGH VOLTAGE — 450V (±225V)
• HIGH SLEW RATE — 1000V/μS
• HIGH OUTPUT CURRENT — 200mA
APPLICATIONS
•
•
•
•
PATENTED
HIGH VOLTAGE INSTRUMENTATION
PIEZO TRANSDUCER EXCITATION
PROGRAMMABLE POWER SUPPLIES UP TO 430V
ELECTROSTATIC TRANSDUCERS & DEFLECTION
12-PIN SIP
PACKAGE STYLE DP
Formed leads available
Package styles ED & EE
TYPICAL APPLICATION
DESCRIPTION
The PA98 is a high voltage, high power bandwidth MOSFET
operational amplifier designed for output currents up to 200mA.
Output voltages can swing up to ±215V with a dual supply
and up to +440 volts with a single supply. The safe operating
area (SOA) has no second breakdown limitations and can
be observed with all types of loads by choosing an appropriate current limiting resistor. High accuracy is achieved with
a cascode input circuit configuration. All internal biasing is
referenced to a bootstrapped zener-MOSFET current source.
As a result, the PA98 features an unprecedented supply range
and excellent supply rejection. The MOSFET output stage is
biased on for linear operation. External compensation provides
user flexibility.
This hybrid circuit utilizes thick film (cermet) resistors, ceramic
capacitors and silicon semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically
bonded aluminum wires provide reliable interconnections at
all operating temperatures. The Power SIP package is electrically isolated.
EQUIVALENT SCHEMATIC
��
���
��
��
��
��
���
����
�
���
�
��
����
��
����
���
�
��
�
��
��
���
���
�
��
�
���
��
�����
�������
������
��
����
Dynamic focusing is the active correction of focusing voltage
as a beam traverses the face of a CRT. This is necessary in
high resolution flat face monitors since the distance between
cathode and screen varies as the beam moves from the center
of the screen to the edges. PA98 lends itself well to this function
since it can be connected as a summing amplifier with inputs
from the nominal focus potential and the dynamic correction.
The nominal might be derived from a potentiometer, or perhaps automatic focusing circuitry might be used to generate
this potential. The dynamic correction is generated from the
sweep voltages by calculating the distance of the beam from
the center of the display.
EXTERNAL CONNECTIONS
�
�
�
�
�
�
�
�
�
��
��
��
��
��
���
��
���
���
�
���
�
�������
������������
�
���
�
���
��
�����
����
DYNAMIC FOCUSING
���
���
��
����
�������
������
���
���
�
� ���
�
�
�������������
��
��
���
� ���
��
�����
���
���������������������
PHASE COMPENSATION
Gain
1
20
100
CC
68pF
10pF
3.3pF
RC
100Ω
330Ω
0Ω
CC RATED FOR FULL SUPPLY VOLTAGE
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
PA98 • PA98A
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, continuous within SOA
POWER DISSIPATION, continuous @ TC = 25°C2
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s max.
TEMPERATURE, junction2
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
TEST CONDITIONS 1
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. time
BIAS CURRENT, initial3
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial3
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE4
COMMON MODE REJECTION, DC
NOISE
Full temperature range
VCM = ±90V
100kHz BW, RS = 1KΩ, CC = 10pf
GAIN
OPEN LOOP, @ 15Hz
RL = 2KΩ, CC = OPEN
GAIN BANDWIDTH PRODUCT at 1MHz RL = 2KΩ, CC = 3.3pf
POWER BANDWIDTH
CC = 10pf
CC = 3.3pf
PHASE MARGIN
Full temperature range
OUTPUT
VOLTAGE SWING4
VOLTAGE SWING4
VOLTAGE SWING4
CURRENT, continuous
SLEW RATE, AV = 20
SLEW RATE, AV = 100
CAPACITIVE LOAD, AV = +1
SETTLING TIME to .1%
RESISTANCE, no load
POWER SUPPLY
VOLTAGE6
CURRENT, quiescent
THERMAL
RESISTANCE, AC, junction to case5
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
MIN
IO = ±200mA
IO = ±75mA
IO = ±20mA
TC = 85°C
CC = 10pf
CC = OPEN
Full temperature range
CC = 10pf, 2V step
RCL = 0
Full temperature range
Full temperature range, F > 60Hz
Full temperature range, F < 60Hz
Full temperature range
Meets full range specifications
±VS–15
90
96
PA98
TYP
.5
10
3
75
5
.01
10
1011
4
MAX
–25
30
UNITS
.5
10
*
*
*
mV
µV/°C
µV/V
µV/kh
pA
pA/V
pA
Ω
pF
V
dB
µVrms
*
*
*
*
*
*
dB
MHz
kHz
kHz
°
*
*
*
*
*
*
*
*
*
V
V
V
mA
V/µs
V/µs
pf
µs
Ω
100
*
*
111
100
300
500
60
700
*
±225
25
*
2.5
4.2
+85
PA98A
TYP
MAX
50
110
1
±150
21
MIN
2
30
10
±Vs–10 ±Vs–6.5
±V–8.5 ±Vs–6.0
±V–8.0 ±Vs–5.5
±200
400
1000
470
1
50
±15
450V
200mA
30W
±25V
±VS
260°C
150°C
–40 to +85°C
–25 to +85°C
*
.25
5
*
*
3
*
3
*
*
*
*
*
*
*
10
30
*
*
*
V
mA
*
*
°C/W
°C/W
°C/W
°C
*
NOTES: * The specification of PA98A is identical to the specification for PA98 in applicable column to the left.
1. Unless otherwise noted: TC = 25°C, compensation = CC = 68pF, RC = 100Ω. DC input specifications are ± value given. Power
supply voltage is typical rating.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF. Ratings apply only to output transistors. An additional 10W may be dissipated due to quiescent power.
3. Doubles for every 10°C of temperature increase.
4. +VS and –VS denote the positive and negative power supply rail respectively.
5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
6. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case.
CAUTION
The PA98 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The exposed substrate contains beryllia (BeO). 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
2
�
���������
����
����
����
��
�
��
��
�
�
�����
� ���
�
����
� �����
�
�
�
���������������
���
���
���������
���
��
��
��
��
��
���
����
��
�����������������
���
��������������������������������
�������������������������������
�
��
�� ��
��
�� ��
������������������������������������
���������������������
����
����
����
��
���
���
���
���
��
���
�����������������
����
����������������������
���
��
��
��
��
�
�� ��� �� ��� ���� ��
�����������������
��
��������
����
����
��
�����������������
��
��
��
��
�
�
�
�
��
���
��
���
�����������������
����
�������������
���
���
���
���
���
��
�������������������
������������������������
�����������������
���
��
���
��� ���
���
�����������������������
�������
��������
���������
��������
���
���
��
���
�������������������
���
���������������������
��
���������
�
���
�
���
���
���
������
����������������������������
���
����
��� �� ��� ���� �� ��� ���
�����������������
�
���
��
���
��
���������������������
���
��
���
��
�
����������
��
���������
����
��
��
����
��
����
� ���
� ��������
���
��
���������
��
���
����
���
��
����������
��
��
��
���
�����������������
�
���
��
����
���
��
��
�� ��� ��� ���
�������������������������
���������������������
����������
�
�
������������������������������������
��
���������
���
����
������������������������
������������
��
�����������������
����
���
��
�
��������������
�
�������������������������������
��������������
��
���
����������������������
TYPICAL PERFORMANCE
GRAPHS
�������������������������������������
������������
���������������������������������
PA98 • PA98A
���
���
���
��
��
�
�
�
��
�� ��
�����������������������
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
OPERATING
CONSIDERATIONS
PA98 • PA98A
GENERAL
Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking, mounting,
current limit, SOA interpretation, and specification interpretation. Visit www.apexmicrotech.com for design tools that help
automate tasks such as calculations for stability, internal power
dissipation, current limit; heat sink selection; Apex’s complete
Application Notes library; Technical Seminar Workbook; and
Evaluation Kits.
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be
connected as shown in the external connection diagram. The
minimum value is 1.4 ohm, however for optimum reliability the
resistor value should be set as high as possible. The value
is calculated as follows; with the maximum practical value of
30 ohms.
.7
RCL =
ILIM - .016
load. This is not the same as the absolute maximum internal
power dissipation listed elsewhere in the specification since
the quiescent power dissipation is significant compared to
the total.
INPUT PROTECTION
Although the PA98 can withstand differential voltages up to
±25V, additional external protection is recommended. Since
the PA98 is a high speed amplifier, low leakage, low capacitance JFETs connected as diodes are recommended (e.g.
2N4416, Q1-Q4 in Figure 1). The differential input voltage will
be clamped to ±1.4V. This is sufficient overdrive to produce
maximum power bandwidth.
POWER SUPPLY PROTECTION
The MOSFET output stage of this power operational amplifier has two distinct limitations:
1. The current handling capability of the MOSFET geometry
and the wire bonds.
2. The junction temperature of the output MOSFETs.
NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. The zeners clamp
transients to voltages within the power supply rating and also
clamp power supply reversals to ground. Whether the zeners
are used or not, the system power supply should be evaluated
for transient performance including power-on overshoot and
power-off polarity reversals as well as line regulation.
Conditions which can cause open circuits or polarity reversals
on either power supply rail should be avoided or protected
against. Reversals or opens on the negative supply rail is
known to induce input stage failure. Unidirectional transzorbs
prevent this, and it is desirable that they be both electrically
and physically as close to the amplifier as possible.
SAFE OPERATING CURVES
STABILITY
The safe operating area curves define the maximum additional internal power dissipation the amplifier can tolerate
when it produces the necessary output to drive an external
The PA98 is externally compensated and performance can
be tailored to the application. Use the graphs of small signal
response and power response as a guide. The compensation
capacitor CC must be rated at 500V working voltage. An NPO
capacitor is recommended. The compensation network CCRC
must be mounted closely to the amplifier pins 7 and 8 to avoid
spurious oscillation.
SAFE OPERATING AREA (SOA)
���
�����������������������������������
���
��
���
��
��
�
��
�
���
���
��
��
���
���
�
��
���
�
��
��
���
�
��
��
��
��
��
��
��
�
���
�
��
��
�
����
�
��
��
������
��
���
��
��
���������
�����������
����������
��
��
�
����
��
���
����������������������������������
��
��
��
��
��� ���
���
���
������������������������������������������
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
4
PA98 • PA98A
OPERATING
CONSIDERATIONS
INTERNAL POWER DISSIPATION AND HEATSINK SELECTION
With the unique combination of high voltage and speed
of the PA98, traditional formulas for heatsink selection will
falsely lower the apparent power handling capability of this
amplifier. To more accurately predict operating temperatures
use Power Design1 revision 10 or higher, or use the following
procedure:
Find internal dissipation (PD) resulting from driving the
load. Use Power Design or refer to Apex Applications Note
1, General Operating Considertaions, paragraph 7. Find total
quiescent power (PDQ) by multiplying 0.025A by VSS (total
supply voltage). Find output stage quiescent power (PDQOUT)
by multiplying 0.001 by VSS.
Calculate a heatsink rating which will maintain the case at
85°C or lower.
RØSA =
Tc - Ta
-0.1°C/W
PD + PDQ
Where: TC = maximum case temperature allowed
TA = maximum ambient temperature encountered
Calculate a heatsink rating which will maintain output transistor
junctions at 150°C or lower.
RØSA =
TJ - Ta - (PD + PDQOUT) *RØJC
-0.1°C/W
PD + PDQ
Where: TJ = maximum junction temperature allowed.
RØJC= AC or DC thermal resistance from the specification table.
Use the larger heatsink of these two calculations.
Power Design is an Excel spreadsheet available free from
www.apexmicrotech.com
This data
sheet has been carefullyCORPORATION
checked and is believed
to be reliable,
however,
no responsibility
is assumed
for possible•inaccuracies
or omissions.
All specifications
subject to change without notice.
APEX
MICROTECHNOLOGY
• TELEPHONE
(520)
690-8600
• FAX (520)
888-3329
ORDERS (520)
690-8601
• EMAILare
prodlit@apexmicrotech.com
PA98U REV I DECEMBER 2004 © 2004 Apex Microtechnology Corp.
5