PAD115 Thaler Corporation, PAD115 Datasheet - Page 4

• Manufacturer Part Number: PAD115
• Description: High Power Operational Amplifier
• Manufacturer: Thaler Corporation

HIGH POWER OPERATIONAL AMPLIFIER
The PAD115 relies on its fan for proper cooling of the
amplifier. Make sure that air flow to the fan and away from the
heat sink remains unobstructed. The cooling method used is
impingement cooling, which means that cool air is pushed into
the heat sink and warm air is exhausted through the spaces
between the heat sink fins.
The amplifier is supplied with four 4-40 M/F hex spacers at the
four corner of the amplifier. Since the male threaded ends of
the spacers extend beyond the amplifier pins the spacers
provide a convenient alignment tool to guide the insertion of
the amplifier pins into the circuit board. Once the amplifier is
seated secure the module with the provided
torque to 4.7 in oz [3.8 N cm] max. See “Dimensional
Information” for a detailed drawing.
The PAD115 must be phase compensated to operate correctly.
The compensation capacitor, C
and 5. On page 6, Typical Performance Graphs, you will find
plots for small signal response and phase response using
compensation values of 100pF and 470pF. The compensation
capacitor must be an NPO type capacitor rated for the full
supply voltage (300V). On page 2, under Amplifier Pinout &
Connections, you will find a table that gives recommended
compensation capacitance value for various circuit gains and
the resulting slew rate for each capacitor value. A
compensation capacitor less than 100pF is not recommended.
An analog output voltage is provided (pin 24, TMP) relative to
ground and proportional to the temperature in degrees C. The
slope is approximately -10.82mV/
follows the equation:
Where V is the TMP output voltage and T is the substrate
temperature in degrees C.
This high impedance output circuit is susceptible to capacitive
loading and pickup from the output of the amplifier. When
monitoring TMP filter the voltage as shown in Figure 3. See
Applications Circuits.
The temperature monitoring circuit automatically turns off the
output transistors when the substrate temperature reaches
110
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o
C. When the substrate cools down 10
TEMPERATURE REPORTING
MOUNTING THE AMPLIFIER
PHASE COMPENSATION
THERMAL SHUTDOWN
T = (2.127 ─ V) (92.42)
COOLING FAN
C
, is connected between pins 4
o
C. The output voltage
o
C the output is
4-40 nuts and
enabled once again. The thermal shutdown feature is
activated either by amplifier overloads or a failure of the fan
circuit.
When pin 26 ( SD ) is taken low (ground) the output stage is
turned “off” and remains “off” as long as pin 26 is low.
When pin 26 is monitored with a high impedance circuit it
also functions as a flag, reporting when the amplifier is shut
down. A “high” (+5V) on pin 26 indicates the temperature
is in the normal range. A “low” (ground) indicates a
shutdown condition. See Application Circuits for details
on how to implement an external shutdown circuit and how
to monitor the shutdown status.
The PAD115 does not have a current limiting circuit built
in. However, a Current Limit Accessory Module, model
PAD123, is available if the current limiting function is
needed for the application. See the PAD123 data sheet and
Application Circuits for a typical connection diagram.
EXTERNAL SHUTDOWN
CURRENT LIMIT
OPERATING CONSIDERATIONS
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PAD115
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