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參數(shù)資料
| 型號(hào)： | PA17 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類(lèi)： | 運(yùn)算放大器 |
| 英文描述： | POWER OPERATIONAL AMPLIFIER |
| 中文描述： | 功率運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 3/3頁(yè) |
| 文件大?。?/td> | 440K |
| 代理商： | PA17 |
APEX MICROTECHNOLOGY CORPORATION
TELEPHONE (520) 690-8600
FAX (520) 888-3329
ORDERS (520) 690-8601
EMAIL prodlit@apexmicrotech.com
PA17U REV 3 JUNE 2000 2000 Apex Microtechnology Corp.
PA17
OPERATING CONSIDERATIONS
GENERAL
Please read Application Note 1 "General Operating Consid-
erations" which covers stability, supplies, heat sinking, mount-
ing, current limit, SOA interpretation, and specification inter-
pretation. 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 Work-
book; and Evaluation Kits.
CURRENT LIMIT
The positive and negative outputs of the PA17 must be
connected together by the user. However, the fact that multiple
pins share the output current allows for some unusual current
limit schemes not found in amplifiers with a single output pin.
Three pins each in the positive and negative outputs share
the output current of the PA17. Pins 8 and 10 of the positive
output and pins 15 and 17 of the negative output each carry
approximately 25% of the output current. Pin 9 of the positive
output and pin 16 of the negative output carry the remaining
50% of the output current .
For the current limit to operate correctly pin 3 (IS1) must be
connected to the amplifier output side and pin 2 (IS2) con-
nected to the load side of the current limit resistor Rcl, as
shown in Figure 1. But Rcl may be connected to sample only
a fraction of the output current. With this method the current
limit resistor consumes less power and only slightly lowers the
overall accuracy of the current limit set point. Figure 1, shows
a circuit that samples only 25% of the output current. Only
those pins necessary to illustrate the current limit function are
shown in Figure 1.
In addition, the current limit of the PA17 operates differently
than other Apex linear power amplifiers in that the output
current is not clamped at the current limit set point. Instead,
when an over-current condition is detected the PA17 sets
STATUS (pin 23) high. This flag can alert external circuitry to
do a variety of things to deal with this fault condition. For
example, when STATUS is connected directly to SD (pin 22)
the output stage of the PA17 is disabled until RESET (pin 24)
is toggled high (Figure 1). Another possibility would be to
connect STATUS to the SD pin via a RC circuit to delay the
shutdown of the output stage (Figure 2). This technique would
be useful if a short-term overload is normally expected that
does not exceed the safe operating area of the PA17. In still
another variation STATUS could trigger an external timer that
would periodically reset the PA17 until the fault is cleared.
STATUS, SHUTDOWN AND RESET FUNCTIONS
The 5V logic section of the PA17 provides control and
monitoring functions. The PA17 is protected from thermal
overloads by directly measuring the temperature of the output
transistors. When a thermal overload is detected the output
stage is latched off and the STATUS output goes high, indicat-
ing an alarm condition. A high on the RESET pin resets the
output stage. A high on the SHUTDOWN pin will also latch the
output stage off and forces the STATUS pin high. The SHUT-
DOWN pin can be used to put the PA17 in a standby mode to
lower the quiescent current and standby power dissipation. A
thermal overload immediately latches off the output stage and
cannot be delayed by external circuitry.
BOOST OPERATION
With the V
feature the small signal stages of the
amplifier are operated at higher supply voltages than the
amplifier
’
s high current output stage. +V
(pin 6) and
–
V
(pins 18, 19) are connected to the small signal circuitry
of the amplifier. +V
(pins 11,12) and
–
V
(pins 13, 14) are
connected to the high current output stage. An additional 10V
on the V
pins is sufficient to allow the small signal stages
to drive the output transistors into saturation and improve the
output voltage swing for extra efficient operation when re-
quired. When close swings to the supply rails is not required
the +V
BOOST
and +V
S
pins must be strapped together as well as
the
–
V
and
–
V
pins. The boost voltage pins must not be
at a voltage lower than the V
S
pins.
COMPENSATION
The external compensation components C
and R
are
connected to pins 4 and 5. Unity gain stability can be achieved
at any compensation capacitance greater than 330 pF with at
least 60 degrees of phase margin. At higher gains more phase
shift can be tolerated in most designs and the compensation
capacitance can accordingly be reduced, resulting in higher
bandwidth and slew rate. Use the typical operating curves as
a guide to select C
C
and R
C
for the application.
FIGURE 1.
FIGURE 2.
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