CA3130AT INTERSIL [Intersil Corporation], CA3130AT Datasheet - Page 12

• Manufacturer Part Number: CA3130AT
• Description: 15MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output
• Manufacturer: INTERSIL [Intersil Corporation]

Error-Amplifier in Regulated-Power Supplies
The CA3130 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 13 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. Q
function as zeners to provide supply-voltage for the CA3130
comparator (IC
low impedance, temperature-compensated source of
adjustable reference voltage for the error amplifier.
Transistors Q
transistor-array lC) are connected in parallel as the series-
pass element. Transistor Q
limiting device by diverting base drive from the series-pass
transistors, in accordance with the adjustment of resistor R
Figure 14 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 (lC
associated with lC
although the output of lC
(Q
4
) to provide adequate base drive for the Darlington-
3
and Q
INPUT
-
+
+55V
REGULATION (NO LOAD TO FULL LOAD): <0.005%
INPUT REGULATION: 0.01%/V
HUM AND NOISE OUTPUT: <250 V
1
, Q
+
4
-
1
). Q
in lC
2
2
IC
, Q
4.3k
100 F
CA3086
1W
1
function as previously described,
2
2
, Q
3
Q
Q
(a CA3086 transistor-array lC)
, and Q
4
3
2
1
, and Q
is boosted by a discrete transistor
5
10, 11
9
8, 7
6
in lC
12
4
in lC
5
FIGURE 14. VOLTAGE REGULATOR CIRCUIT (0.1V TO 50V AT 1A)
3
in IC
1, 2
3
5
4
functions as a current-
62k
2.2k
Q
Q
3
1k
1
2
5 F
(another CA3086
2
are configured as a
RMS
12
Q
+
-
UP TO 100kHz
1
5
) and circuitry
14
13
50k
2N2102
3.3k
1W
CA3130, CA3130A
2N3055
VOLTAGE
ADJUST
2
.
2N2102
Q
4
Q
1
1k
6
Q
connected series-pass transistors Q
functions in the previously described current-limiting circuit.
Multivibrators
The exceptionally high input resistance presented by the
CA3130 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 15. Resistors R
and R
supply-voltage and R
repetition rate is selected by positioning S
position and the rate remains essentially constant when the
resistors which determine “on-period” and “off-period” are
adjusted.
Function Generator
Figure 16 contains a schematic diagram of a function
generator using the CA3130 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, R
voltage-control input is also available for remote sweep-
control.
2
7
IC
1
Q
CA3130
2
3
1000pF
8
10k
are used to bias the CA3130 to the mid-point of the
1
4
+
-
1
CURRENT
LIMIT
ADJUST
2N5294
ERROR
AMPLIFIER
3
2
10k
3
8.2k
43k
is the feedback resistor. The pulse
+
-
100 F
1
0.1 TO 50V
OUTPUT:
, Q
AT 1A
2
. Transistor Q
1
-
+
to the desired
3
1
. A
1