CA3140M Intersil, CA3140M Datasheet - Page 14

• Manufacturer Part Number: CA3140M
• Description: IC OP AMP BIMOS 4.5MHZ 8-SOIC
• Manufacturer: Intersil

Specifications of CA3140M

• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Slew Rate: 9 V/µs
• Gain Bandwidth Product: 4.5MHz
• Current - Input Bias: 10pA
• Voltage - Input Offset: 5000µV
• Current - Supply: 4mA
• Current - Output / Channel: 40mA
• Voltage - Supply, Single/dual (±): 4 V ~ 36 V, ±2 V ~ 18 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• -3db Bandwidth: -

A small heat sink VERSAWATT transistor is used as the
series pass element in the fold back current system, Figure
17, since dissipation levels will only approach 10W. In this
system, the D2201 diode is used for current sampling.
Foldback is provided by the 3kΩ and 100kΩ divider network
connected to the base of the current sensing transistor.
Both regulators provide better than 0.02% load regulation.
Because there is constant loop gain at all voltage settings, the
FIGURE 18A. SUPPLY TURN-ON AND TURNOFF
FIGURE 16. REGULATED POWER SUPPLY
+30V
(MEASUREMENT BANDWIDTH
INPUT
HUM AND NOISE OUTPUT <200µV
FIGURE 18. WAVEFORMS OF DYNAMIC CHARACTERISTICS OF POWER SUPPLY CURRENTS SHOWN IN FIGURES 16 AND 17
LINE REGULATION 0.1%/V
10
3
9
8
6
2.7kΩ
11
7
POWER DARLINGTON
2.2kΩ
CHARACTERISTICS
10µF
1
2N6385
100Ω
1
3
5
4
-
+
2
62kΩ
5V/Div., 1s/Div.
6
+
-
75Ω
3kΩ
12
100kΩ
~
10MHz)
5µF
CA3086
1kΩ
5
14
CA3140
RMS
CURRENT
LIMITING
ADJUST
14
13
2
7
1
50kΩ
1kΩ
8
4
D2201
(NO LOAD TO FULL LOAD)
1kΩ
2
3
1kΩ
1kΩ
56pF
LOAD REGULATION
VOLTAGE
1kΩ
ADJUST
2N2102
100kΩ
0.01µF
2
<0.02%
180kΩ
82kΩ
0.1 ⇒ 24V
OUTPUT
1
3
AT 1A
+
-
CA3140, CA3140A
250µF
regulation also remains constant. Line regulation is 0.1% per
volt. Hum and noise voltage is less than 200µV as read with a
meter having a 10MHz bandwidth.
Figure 18A shows the turn ON and turn OFF characteristics
of both regulators. The slow turn on rise is due to the slow
rate of rise of the reference voltage. Figure 18B shows the
transient response of the regulator with the switching of a
20Ω load at 20V output.
FIGURE 17. REGULATED POWER SUPPLY WITH “FOLDBACK”
+30V
Bottom Trace: Collector of load switching transistor, load = 1A;
(MEASUREMENT BANDWIDTH
INPUT
HUM AND NOISE OUTPUT <200µV
Top Trace: Output Voltage;
LINE REGULATION 0.1%/V
10
9
8
6
2.7kΩ
11
7
FIGURE 18B. TRANSIENT RESPONSE
CURRENT LIMITING
2.2kΩ
200mV/Div., 5µs/Div.
5V/Div., 5µs/Div.
10µF
100kΩ
2
1
3
5
4
2N5294
“FOLDBACK” CURRENT
+
-
2
62kΩ
1
6
+
-
100kΩ
12
~
LIMITER
3
10MHz)
5µF
CA3086
1kΩ
5
100kΩ
CA3140
RMS
14
13
7
1
50kΩ
1kΩ 200Ω
8
4
D2201
(NO LOAD TO FULL LOAD)
1kΩ
2
3
3kΩ
56pF
LOAD REGULATION
VOLTAGE
1kΩ
ADJUST
2N2102
100kΩ
0.01µF
OUTPUT ⇒ 0V TO 25V
25V AT 1A
“FOLDS BACK”
TO 40mA
<0.02%
180kΩ
82kΩ
July 11, 2005
+
-
FN957.10
250µF