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부품번호 PB50 기능
기능 POWER BOOSTER AMPLIFIER
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PB50 데이터시트, 핀배열, 회로
MICROTECHNOLOGY
POWER BOOSTER AMPLIFIER
PB50
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
FEATURES
• WIDE SUPPLY RANGE — ±30V to ±100V
• HIGH OUTPUT CURRENT — Up to 2A Continuous
• VOLTAGE AND CURRENT GAIN
• HIGH SLEW RATE — 50V/µs Minimum
• PROGRAMMABLE OUTPUT CURRENT LIMIT
• HIGH POWER BANDWIDTH — 160 kHz Minimum
• LOW QUIESCENT CURRENT — 12mA Typical
APPLICATIONS
• HIGH VOLTAGE INSTRUMENTATION
• Electrostatic TRANSDUCERS & DEFLECTION
• Programmable Power Supplies Up to 180V p-p
DESCRIPTION
The PB50 is a high voltage, high current amplifier designed
to provide voltage and current gain for a small signal, general
purpose op amp. Including the power booster within the
feedback loop of the driver amplifier results in a composite
amplifier with the accuracy of the driver and the extended
output voltage range and current capability of the booster. The
PB50 can also be used without a driver in some applications,
requiring only an external current limit resistor to function
properly.
The output stage utilizes complementary MOSFETs, pro-
viding symmetrical output impedance and eliminating second-
ary breakdown limitations imposed by Bipolar Junction Tran-
sistors. Internal feedback and gainset resistors are provided
for a pin-strappable gain of 3. Additional gain can be achieved
with a single external resistor. Compensation is not required
for most driver/gain configurations, but can be accomplished
with a single external capacitor. Although the booster can be
configured quite simply, enormous flexibility is provided through
the choice of driver amplifier, current limit, supply voltage,
voltage gain, and compensation.
This hybrid circuit utilizes a beryllia (BeO) substrate, thick
film resistors, ceramic capacitors and semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections at all operating temperatures. The 8-pin TO-3
package is electrically isolated and hermetically sealed using
one-shot resistance welding. The use of compressible isola-
tion washers voids the warranty.
TYPICAL APPLICATION
CF
Figure 1. Inverting
composite amplifier.
VIN R I
RF
+15V
+Vs
OP
AMP
IN
COM PB50
–15V
–Vs
R CL
OUT
CC
RG
RL
EQUIVALENT SCHEMATIC
Q1
IN
4
GAIN 6.2K
7
50K
COM
5
COMP
8
Q4
3.1K
Q9
Q2
Q6
Q10
3
+Vs
Q3
Q5
Q7
OUT
1
2
CL
Q8
–Vs
6
EXTERNAL CONNECTIONS
+Vs
3
CL
2
IN 4
COM
5
TOP VIEW
R CL
OUT
1
COMP
8
CC
–Vs 6
7
GAIN
RG
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]




PB50 pdf, 반도체, 판매, 대치품
PB50
OPERATING
CONSIDERATIONS
GENERAL
Please read the “General Operating Considerations” sec-
tion, which covers stability, supplies, heatsinking, mounting,
current limit, SOA interpretation, and specification interpreta-
tion. Additional information can be found in the application
notes. For information on the package outline, heatsinks, and
mounting hardware, consult the “Accessory and Package
Mechanical Data” section of the handbook.
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be
connected as shown in the external connection diagram. The
minimum value is 0.27with a maximum practical value of
47. For optimum reliability the resistor value should be set as
high as possible. The value is calculated as follows: +IL= .65/
RCL + .010, –IL = .65/RCL.
SAFE OPERATING AREA (SOA)
3
2
1
STEADSYTESSATTDAEYTAEDSTYTASTTEATTCE=TC85=°C25°tC=t2=0100m0tsm= s50ms
.1 C = 125°C
10 20 30 40 50 100 200 300
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE VS — VO (V)
NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback, exter-
nal fast-recovery diodes should be used.
COMPOSITE AMPLIFIER CONSIDERATIONS
Cascading two amplifiers within a feedback loop has many
advantages, but also requires careful consideration of several
amplifier and system parameters. The most important of these
are gain, stability, slew rate, and output swing of the driver.
Operating the booster amplifier in higher gains results in a
higher slew rate and lower output swing requirement for the
driver, but makes stability more difficult to achieve.
GAIN SET
RG = [ (Av-1) * 3.1K] – 6.2K
Av = RG + 6.2K +1
3.1K
The booster’s closed-loop gain is given by the equation
above. The composite amplifier’s closed loop gain is deter-
mined by the feedback network, that is: –Rf/Ri (inverting) or
1+Rf/Ri (non-inverting). The driver amplifier’s “effective gain”
is equal to the composite gain divided by the booster gain.
Example: Inverting configuration (figure 1) with
R i = 2K, R f = 60K, R g = 0 :
Av (booster) = (6.2K/3.1K) + 1 = 3
Av (composite) = 60K/2K = - 30
Av (driver) = - 30/3 = -10
STABILITY
Stability can be maximized by observing the following guide-
lines:
1. Operate the booster in the lowest practical gain.
2. Operate the driver amplifier in the highest practical effec-
tive gain.
3. Keep gain-bandwidth product of the driver lower than the
closed loop bandwidth of the booster.
4. Minimize phase shift within the loop.
A good compromise for (1) and (2) is to set booster gain from
3 to 10 with total (composite) gain at least a factor of 3 times
booster gain. Guideline (3) implies compensating the driver as
required in low composite gain configurations. Phase shift
within the loop (4) is minimized through use of booster and loop
compensation capacitors Cc and Cf when required. Typical
values are 5pF to 33pF.
Stability is the most difficult to achieve in a configuration
where driver effective gain is unity (ie; total gain = booster
gain). For this situation, Table 1 gives compensation values for
optimum square wave response with the op amp drivers listed.
DRIVER
OP07
741
LF155
LF156
TL070
CCH
-
-
-
-
22p
CF CC FPBW SR
22p 22p 4kHz 1.5
18p 10p 20kHz 7
4.7p 10p 60kHz >60
4.7p 10p 80kHz >60
15p 10p 80kHz >60
For: RF = 33K, RI = 3.3K, RG = 22K
Table 1: Typical values for case where op amp effective gain = 1.
CF
+15V
RF
RI
C CH
+Vs
R CL
VIN
OP
AMP
IN
OUT
COM PB50 COMP
CC
–15V
–Vs GAIN R G
Figure 2. Non-inverting composite amplifier.
RL
SLEW RATE
The slew rate of the composite amplifier is equal to the slew
rate of the driver times the booster gain, with a maximum value
equal to the booster slew rate.
OUTPUT SWING
The maximum output voltage swing required from the driver
op amp is equal to the maximum output swing from the booster
divided by the booster gain. The Vos of the booster must also
be supplied by the driver, and should be subtracted from the
available swing range of the driver. Note also that effects of
Vos drift and booster gain accuracy should be considered
when calculating maximum available driver swing.
ATPhiEsXdatMa IsCheReOt hTaEsCbHeeNnOcaLreOfuGllYy cChOecRkePdOaRndAiTsIbOelNieved 5to9b8e0reNliaObRleT, HhowSeHveAr,NnNoOreNspoRnOsiAbiDlityisTaUssCuSmOedNf,orApRoIssZibOleNiAna8cc5u7ra4ci1es or UomSiAssionsA. PAlPl LspIeCcAifiTcIaOtioNnSs aHreOsTubLjIeNctEt:o 1cha(n8g0e0w)ith5o4ut6n-o2t7ic3e.9
PB50U REV. G DECEMBER 1997 © 1997 Apex Microtechnology Corp.

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