HCA10014 Datasheet, PDF (14/17 Pages) Intersil Corporation – 15MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output

HCA10014
+
4.3kΩ
1W
2N3055
Q₂
2N2102
3.3kΩ
1W
1kΩ
Q₁
1Ω
10kΩ
CURRENT
LIMIT
Q₃
ADJUST
2N5294
+
- ^100µF
2.2kΩ
1000pF
43kΩ
+55V
INPUT
+
IC₂
5µF _-
CA3086 10, 11 1, 2
Q₄
9
Q₁
3
8, 7 5
Q₃
6
Q₂
4
Q₅ ¹⁴
12 ₁₃
2N2102
6
Q₄
1 ERROR
8
AMPLIFIER
7
+
3
HCA10014
10kΩ
IC₁
-
2
4
8.2kΩ
+
+
100µF
-
OUTPUT:
0.1 TO 50V
AT 1A
1kΩ
62kΩ
50kΩ
VOLTAGE
ADJUST
-
-
REGULATION (NO LOAD TO FULL LOAD): <0.005%
INPUT REGULATION: 0.01%/V
HUM AND NOISE OUTPUT: <250µV_RMS UP TO 100kHz
FIGURE 20. VOLTAGE REGULATOR CIRCUIT (0.1V TO 50V AT 1A)
Error Amplifier in Regulated Power Supplies
The HCA10014 is an ideal choice for error amplifier service
in regulated power supplies since it can function as an error
amplifier when the regulated output voltage is required to
approach zero. Figure 19 shows the schematic diagram of a
40mA power supply capable of providing regulated output
voltage by continuous adjustment over the range from 0V to
13V. Q₃ and Q₄ in lC₂ (a CA3086 transistor array lC)
function as zeners to provide the supply voltage for
comparator IC₁. Q₁, Q₂, and Q₅ in IC₂ are configured as a
low impedance, temperature compensated source of
adjustable reference voltage for the error amplifier.
Transistors Q₁, Q₂, Q₃, and Q₄ in lC₃ (another CA3086
transistor array lC) are connected in parallel as the series
pass element. Transistor Q₅ in lC₃ functions as a current
limiting device by diverting base drive from the series pass
transistors, in accordance with the adjustment of resistor R₂.
Figure 20 contains the schematic diagram of a regulated
power supply capable of providing regulated output voltage
by continuous adjustment over the range from 0.1V to 50V
and currents up to 1A. The error amplifier (lC₁) and circuitry
associated with lC₂ function as previously described,
although the output of lC₁ is boosted by a discrete transistor
(Q₄) to provide adequate base drive for the Darlington
connected series pass transistors Q₁, Q₂. Transistor Q₃
functions in the previously described current limiting circuit.
Multivibrators
The exceptionally high input resistance presented by the
HCA10014 is an attractive feature for multivibrator circuit
design because it permits the use of timing circuits with high
R/C ratios. The circuit diagram of a pulse generator (astable
multivibrator), with provisions for independent control of the
“on” and “off” periods, is shown in Figure 21. Resistors R₁
and R₂ are used to bias the HCA10014 to the midpoint of
the supply voltage and R₃ is the feedback resistor. The pulse
repetition rate is selected by positioning S₁ to the desired
position and the rate remains essentially constant when the
resistors which determine “on-period” and “off-period” are
adjusted.
Function Generator
Figure 22 contains a schematic diagram of a function
generator using the HCA10014 in the integrator and
threshold detector functions. This circuit generates a
triangular or square wave output that can be swept over a
1,000,000:1 range (0.1Hz to 100kHz) by means of a single
control, R₁. A voltage control input is also available for
remote sweep control.
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