April 1994
SEMICONDUCTOR
Voltage Regulators Adjustable from 2V to 37V at Output
Currents Up to 150mA Without External Pass Transistors
CA723, CA723C
Features
• Up to 150mA Output Current
• Positive and Negative Voltage Regulation
• Regulation in Excess of 10A with Suitable Pass
Transistors
• Input and Output Short-Circuit Protection
• Load and Line Regulation. . . . . . . . . . . . . . . . . . .0.03%
• Direct Replacement for 723 and 723C Industry Types
• Adjustable Output Voltage . . . . . . . . . . . . . . . 2V to 37V
Applications
• Series and Shunt Voltage Regulator
• Floating Regulator
• Switching Voltage Regulator
• High-Current Voltage Regulator
• Temperature Controller
Ordering Information
PART TEMPERATURE PACKAGE
CA723E -55oC to +125oC 14Lead Plastic DIP
CA723T -55oC to +125oC 10 Pin Metal Can
CA723CE 0oC to +70oC 14 Lead Plastic DIP
CA723CT 0oC to +70oC 10 Pin Metal Can
Pinouts
CA723 (PDIP)
TOP VIEW
Functional Block Diagram
Description
The CA723 and CA723C are silicon monolithic integrated circuits designed for service as voltage regulators at output voltages ranging from 2V to 37V at currents up to 150mA.
Each type includes a temperature-compensated reference
amplifier, an error amplifier, a power series pass transistor, and
a current-limiting circuit. They also provide independently accessible inputs for adjustable current limiting and remote shutdown
and, in addition, feature low standby current drain, low temperature drift, and high ripple rejection.
The CA723 and CA723C may be used with positive and negative power supplies in a wide variety of series, shunt, switching,
and floating regulator applications. They can provide regulation
at load currents greater than 150mA and in excess of 10A with
the use of suitable n-p-n or p-n-p external pass transistors.
The CA723 and CA723C are supplied in the 10 lead TO-100
metal can(T suffix), and the 14 lead dual-in-line plastic package
(E suffix), and are direct replacements for industry types LM723,
LM723C in packages with similar terminal arrangements.
NC
CURRENT
LIMIT
CURRENT
SENSE
INV
INPUT
NON-INV
INPUT
V
REF
1
2
3
4
5
6
7
V-
-
ERROR
AMP
+
VOLT
REF
CA723C (CAN)
NC
14
FREQ
13
COMP
V+ UNREG
12
INPUT
11
V
10
V
9
V
8
NC
V+
UNREGULATED
TEMPERATURECOMPENSATED
ZENER
C
VOLT
O
Z
REF
AMP
V
REF
NON-INVERTING
INPUT
INVERTING
INPUT
INPUT
V-
CURRENT
TOP VIEW
CURRENT LIMIT
CURRENT
SENSE
INV
INPUT
NON-INV
INPUT
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright
© Harris Corporation 1994
1
2
+
ERROR
AMP
-
3
V
REF
VOLT
REF
4
TAB
10
5
V-, (CASE INTERNALLY
CONNECTED TO TERM 5)
9
6
FREQ
COMP
8
7
V
O
V+
UNREG
INPUT
V
C
7-3
COMPENSATION
-
ERROR
AMP
+
LIMIT
FREQUENCY
CURRENT
SENSE
CURRENT
LIMITER
V
C
SERIES PASS
TRANSISTOR
V
REGULATED
O
OUTPUT
V
Z
File Number 788.3
Specifications CA723, CA723C
Absolute Maximum Ratings Operating Conditions
DC Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
(Between V+ and V- Terminals)
Pulse Voltage for 50ms
Pulse Width (Between V+ and V- Terminals) . . . . . . . . . . . . . 50V
Differential Input-Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . 40V
Differential Input Voltage
Between Inverting and Noninverting Inputs. . . . . . . . . . . . . . . . ±5V
Between Noninverting Input and V- . . . . . . . . . . . . . . . . . . . . . 8V
Current From Zener Diode Terminal (VZ). . . . . . . . . . . . . . . . .25mA
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Thermal Resistance θ
JA
θ
JC
Plastic DIP Package . . . . . . . . . . . . . . . . 120oC/W -
Metal Can . . . . . . . . . . . . . . . . . . . . . . . . 136oC/W 65oC/W
Device Dissipation
CA723T, CA723CT, Up to TA = +25oC. . . . . . . . . . . . . . . . 900mW
CA723E, CA723CE, Up to TA = +25oC . . . . . . . . . . . . . .1000mW
CA723T, CA723CT, Above TA = +25oC. . . . . . . . . . . . .7.4mW/oC
CA723E, CA723CE, Above TA = +25oC . . . . . . . . . . . . 8.3mW/oC
Ambient Temperature Range
Operating Temperature Range . . . . . . . . . . . . . .-55oC to +125oC
Storage Temperature Range. . . . . . . . . . . . . . . .-65oC to +150oC
Lead Temperature, During Soldering . . . . . . . . . . . . . . . . . . +265oC
At a distance 1/16” ± 1/32” (1.59mm ±0.79mm) from case for 10s
max
DC Electrical Specifications T
= +25oC, V+ = VC = VI = 12V, V- = 0, VO = 5V, IL = 1mA, C1 = 100pF, C
A
REF
= 0, R
SCP
= 0,
Unless Otherwise Specified. Divider impedance R1 R2÷ R1 + R2 at noninverting input, T erminal 5 =
10kΩ. (Figure 20)
CA723 CA723C
PARAMETERS TEST CONDITION
UNITSMIN TYP MAX MIN TYP MAX
DC CHARACTERISTICS
Quiescent Regulator Current, I
Input Voltage Range, V
Output Voltage Range, V
Q
I
O
Differential Input-Output Voltage, V
Reference Voltage, V
REF
Line Regulation (Note 1) V
IL = 0, VI = 30V - 2.3 3.5 - 2.3 4 mA
9.5 - 40 9.5 - 40 V
2 - 37 2 - 37 V
- V
I
O
3 - 38 3 - 38 V
6.95 7.15 7.35 6.8 7.15 7.5 V
= 12V to 40V - 0.02 0.2 - 0.1 0.5 % V
I
VI = 12V to 15V - 0.01 0.1 - 0.01 0.1 % V
VI = 12V to 15V,
- - 0.3 - - - % V
TA = -55oC to +125oC
VI = 12V to 15V,
-----0.3% V
TA = 0oC to +70oC
Load Regulation (Note 1) IL = 1mA to 50mA - 0.03 0.15 - 0.03 0.2 % V
IL = 1mA to 50mA,
- - 0.6 - - - % V
TA = -55oC to +125oC
IL = 1mA to 50mA,
-----0.6% V
TA = 0oC to +70oC
Output-Voltage Temperature Coefficient, ∆V
O
TA = -55oC to +125oC - 0.002 0.015 - - - %/oC
= 0oC to +70oC ----0.003 0.015 %/oC
T
A
Ripple Rejection (Note 2) f = 50Hz to 10kHz - 74 - - 74 - dB
-86- -86-dB
- -20 - - 20 - µV
- 2.5 - - 2.5 - µV
Short Circuit Limiting Current, I
LIM
Equivalent Noise RMS Output Voltage,
(Note 2)
V
N
f = 50Hz to 10kHz,
= 5µF
C
REF
R
= 10Ω, VO = 0 - 65 - - 65 - mA
SCP
BW = 100Hz to 10kHz,
C
= 0
REF
BW = 100Hz to 10kHz,
= 5µF
C
REF
NOTES:
1. Line and load regulation specifications are given for condition of a constant chip temperature. For high dissipation condition, temperature
drifts must be separately taken into account.
2. For C
(See Figure 20)
REF
O
O
O
O
O
O
O
7-4
CA723, CA723C
V+
UNREGULATED
INPUT
D1
6.2V
15kΩ
Q1
R1
500Ω
D3
R2
Q6
R3
25kΩ
Q3
Q4
C1
5pF
R7
30kΩ
Q5
R6
100Ω
D2
6.2V
R8
5kΩ
V
REF
FIGURE 1. EQUIVALENT SCHEMATIC DIAGRAM OF THE CA723 AND CA723C
Typical Performance Curves (CA723)
150
100
MAX JUNCTION TEMP (TJ) = +150oC
THERMAL RESISTANCE = 150
QUIESCENT DISSIPATION (PQ) = 60mW
(NO HEAT SINK)
AMBIENT TEMPERATURE (TA) = +25oC
o
C/W
R4
1kΩ
Q10
R9
300Ω
Q7
Q9
R10
20kΩ
NON-INVERTING
INPUT
)
O
R5
1kΩ
Q8
Q12
Q11
Q13
R11
150Ω
V-
OUTPUT VOLTAGE (VO) = 5V
INPUT VOLTAGE (VI) = 12V
SHORT CIRCUIT PROTECTION
0.05
-0.05
RESISTANCE (R
0
Q16
INVERTING
INPUT
V
C
Q14
Q15
R12
15kΩ
D4
) = 0
SCP
AMBIENT TEMPERATURE
V
V
FREQUENCY
COMPENSATION
CURRENT
LIMIT
CURRENT
SENSE
(T
) = +25oC
A
O
Z
-55oC
+125oC
50
MAXIMUM LOAD CURRENT (mA)
0
010203040
DIFFERENTIAL INPUT - OUTPUT VOLTAGE (V)
+125oC
FIGURE 2. MAX LOAD CURRENT vs DIFFERENTIAL INPUT-
OUTPUT VOLTAGE
0.05
0
)
O
-0.05
-0.1
AMBIENT TEMP (TA) = +25oC
-0.15
LOAD REGULATION (V
-0.2
-0.25
0 5 10 15 20 25 30
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (VO) = 5V
INPUT VOLTAGE (V
SHORT CIRCUIT PROTECTION
RESISTANCE (R
-55oC
+125oC
) = 12V
I
SCP
) = 10Ω
-0.1
LOAD REGULATION (V
-0.15
-0.2
0 20 40 60 80 100
OUTPUT CURRENT (mA)
FIGURE 3. LOAD REGULATION WITHOUT CURRENT LIMIT-
ING
OUTPUT VOLTAGE (VO) = 5V
INPUT VOLTAGE (VI) = 12V
SHORT CIRCUIT PROTECTION
0.1
)
O
LOAD REGULATION (V
RESISTANCE (R
0
AMBIENT TEMPERATURE (TA) = -55oC
-0.1
0.2
-0.3
-0.4
0 20 40 60 80 100
) = 0
SCP
+25oC
+125oC
OUTPUT CURRENT (mA)
FIGURE 4. LOAD REGULATION WITH CURRENT LIMITING FIGURE 5. LOAD REGULATION WITH CURRENT LIMITING
7-5
CA723, CA723C
Typical Performance Curves (CA723)
(Continued)
1.2
1.0
0.8
0.6
0.4
OUTPUT VOLTAGE (V)
0.2
0
20 40 60 80 1000
OUTPUT CURRENT (mA)
C
o
+125
C
o
) = -55
A
C
o
AMBIENT TEMPERATURE (T
+25
) = 5V
O
) = 10Ω
) = 12V
I
SCP
RESISTANCE (R
INPUT VOLTAGE (V
SHORT CIRCUIT PROTECTION
OUTPUT VOLTAGE (V
OUTPUT VOLTAGE (VO) = REFERENCE
VOLTAGE (V
LOAD CIRCUIT (I
REF
)= 0
L
)
5
4
3
AMBIENT TEMPERATURE (TA) = -55oC
2
QUIESCENT CURRENT (mA)
1
0
010203040
INPUT VOLTAGE (V)
FIGURE 6. CURRENT LIMITING CHARACTERISTICS FIGURE 7. QUIESCENT CURRENT vs INPUT VOLTAGE
150
MAX. JUNCTION TEMP. (TJ) = +150oC
THERMAL RESISTANCE = 150oC/W
QUIESCENT DISSIPATION (P
TO-5 STYLE PACKAGE WITH NO HEAT SINK
) = 60mW
Q
150
MAX. JUNCTION TEMP. (TJ) = +125oC
THERMAL RESISTANCE = 125
QUIESCENT DISSIPATION (P
DUAL - IN - LINE PLASTIC PACKAGE
WITH NO HEAT SINK
o
C/W
) = 60mW
Q
+25oC
+125oC
100
AMBIENT TEMPERATURE (TA) = +25oC
50
MAXIMUM LOAD CURRENT (mA)
+70oC
0
010203040
DIFFERENTIAL INPUT - OUTPUT VOLTAGE (V)
FIGURE 8. MAX LOAD CURRENT vs DIFFERENTIAL INPUT-
OUTPUT VOLTAGE
OUTPUT VOLTAGE (VO) = 5V
INPUT VOLTAGE (V
SHORT CIRCUIT PROTECTION
)
O
RESISTANCE (R
0
-0.1
LOAD REGULATION (V
) = 12V
I
) = 0
SCP
AMBIENT TEMPERATURE (TA) = +25oC
0oC
+70oC
100
AMBIENT TEMPERATURE (TA) = +25oC
50
MAXIMUM LOAD CURRENT (mA)
0
010
+70oC
20
30
40
DIFFERENTIAL INPUT - OUTPUT VOLTAGE (V)
FIGURE 9. MAX LOAD CURRENT vs DIFFERENTIAL INPUT-
OUTPUT VOLTAGE FOR CA723CE
OUTPUT VOLTAGE (VO) = 5V
INPUT VOLTAGE (V
SHORT CIRCUIT PROTECTION
RESISTANCE (R
)
O
0
-0.1
LOAD REGULATION (V
) = 12V
I
) = 10Ω
SCP
AMBIENT TEMPERATURE (TA) = +25oC
0oC
+70oC
-0.2
0 20 40 60 80 100
OUTPUT CURRENT (mA)
FIGURE 10. LOAD REGULATION WITHOUT CURRENT LIMIT-
ING
-0.2
0102030
OUTPUT CURRENT (mA)
FIGURE 11. LOAD REGULATION WITH CURRENT LIMITING
7-6
CA723, CA723C
Typical Performance Curves (CA723)
1.2
AMBIENT TEMPERATURE (TA) = +25oC
1.0
) = 5V
O
) = 12V
I
(Continued)
) = 10
SCP
OUTPUT VOLTAGE (VO) = REFERENCE
VOLTAGE (V
LOAD CURRENT (IL) = 0
REF
)
5
0.8
4
0.6
0.4
OUTPUT VOLTAGE (V)
0.2
RESISTANCE (R
OUTPUT VOLTAGE (V
INPUT VOLTAGE (V
SHORT CIRCUIT PROTECTION
AMBIENT TEMPERATURE (TA) = +25oC
3
2
QUIESCENT CURRENT (mA)
1
+70oC 0oC
0
060402010 80 100
OUTPUT CURRENT (mA)
0
01020 3040
INPUT VOLTAGE (V)
FIGURE 12. CURRENT LIMITING CHARACTERISTICS FIGURE 13. QUIESCENT CURRENT vs INPUT VOLTAGE
Typical Performance Curves (CA723 and CA723C)
INPUT VOLTAGE (VI) = 12V
OUTPUT VOLTAGE (VO) = 5V
LOAD CURRENT (IL) = I TO 50mA
0.2
AMBIENT TEMPERATURE (TA) = +25oC
)
O
SHORT CIRCUIT PROTECTION
RESISTANCE (R
0.1
SCP
) = 0
OUTPUT VOLTAGE (VO) = 5V
LOAD CURRENT (IL) = 1mA
AMBIENT TEMPERATURE (T
0.3
DIFFERENTIAL INPUT VOLTAGE (∆VT) = 3V
)
SHORT CIRCUIT PROTECTION RESISTANCE
O
(R
= 0
SCP)
0.2
) = +25oC
A
0oC
+70oC
0
-0.1
LOAD REGULATION (V
-0.2
-0.3
-5 5 15 25 35 45
DIFFERENTIAL INPUT - OUTPUT VOLTAGE (V)
FIGURE 14. LOAD REGULATION vs DIFFERENTIAL INPUT-
OUTPUT VOLTAGE
INPUT VOLTAGE (VI) = 12V, OUTPUT VOLTAGE (VO) = 5V
LOAD CURRENT (I
AMBIENT TEMPERATURE (T
15
SHORT CIRCUIT PROTECTION RESISTANCE (R
10
5
0
5
OUTPUT VOLTAGE DEVIATION (mA)
10
-5 5 15 25 35 45
) = 40mA
L
) = +25oC
A
LOAD CURRENT (IL)
OUTPUT VOLTAGE (VO)
TIME (µs)
SCP)
= 0
10
0
-10
-20
-30
FIGURE 16. LINE TRANSIENT RESPONSE FIGURE 17. CURRENT LIMITING CHARACTERISTIC vs JUNC-
0.1
0
LINE REGULATION (V
-0.1
-0.2
-5 5 15 25 35 45
DIFFERENTIAL INPUT - OUTPUT VOLTAGE (V)
FIGURE 15. LINE REGULATION vs DIFFERENTIAL INPUT-
OUTPUT VOLTAGE
0.8
0.7
0.6
SHORT CIRCUIT LIMITING
CURRENT WITH R
0.5
LOAD DEVIATION (mA)
WITH R
0.4
CURRENT LIMITING SENSE VOLTAGE (V)
0.3
CURRENT LIMITING
SENSE VOLTAGE
= 5Ω
SCP
= 10Ω
SCP
-50 0 50 100 150
JUNCTION TEMPERATURE (
o
C)
TION TEMPERATURE
200
160
120
80
40
SHORT CIRCUIT LIMITING CURRENT (mA)
0
7-7
CA723, CA723C
Typical Performance Curves (CA723 and CA723C)
10
6
INPUT VOLTAGE (VI)
4
2
4
2
1
0
OUTPUT VOLTAGE (VO)
0
INPUT VOLTAGE (VI) = 12V
OUTPUT VOLTAGE (V
LOAD CURRENT (I
-2
AMBIENT TEMPERATURE (TA) = +25oC
OUTPUT VOLTAGE DEVIATION (mA)
SHORT CIRCUIT PROTECTION RESISTANCE
(R
) = 0
SCP
-4
O
) = 1mA
L
) = 5V
-2
-4
INPUT VOLTAGE DEVIATION (V)
-6
0.1
OUTPUT IMPEDANCE (W)
0.01
-5 5 15253545
TIME (µs)
FIGURE 18. LOAD TRANSIENT RESPONSE FIGURE 19. OUTPUT IMPEDANCE vs FREQUENCY
Typical Application Circuits
V+ V
V
I
V
REF
R
1
NON
INV
INPUT
REF
R
2
V-
C
C
COMP
V
CURRENT
LIMIT
CURRENT
SENSE
INV.
INPUT
O
R
SCP
R3
C1
100pF
REGULATED
OUTPUT
INPUT
(Continued)
8
INPUT VOLTAGE (VI) = 12V
6
OUTPUT VOLTAGE (V
4
LOAD CURRENT (I
AMBIENT TEMPERATURE (T
2
SHORT CIRCUIT PROTECTION
RESISTANCE (R
8
6
4
LOAD CAPACITANCE (C
2
8
6
4
2
468 2 468 2 468 2 4682
100
V
R
NON
INV
V+ V
I
V
REF
3
V-
) = 50mA
L
SCP
1k 10k 100k 1M
FREQUENCY (Hz)
C
CURRENT
LIMIT
CURRENT
SENSE
C1
100pF
COMP
) = 5V
O
) = 0
L
) = 0
V
) = +25oC
A
O
R
INV.
INPUT
SCP
1µF
REGULATED
OUTPUT 15V
R
1
R
2
Circuit Performance Data:
Regulated Output Voltage 5V
Line Regulation (∆VI= 3V) 0.5mV
R1 R2
R1 + R2
= 50mA) 1.5mV
L
For Minimum Temperature Drift
Load Regulation (∆I
Note: R3 =
FIGURE 20. LOW VOLTAGE REGULATOR CIRCUIT
(VO = 2V TO 7V)
Circuit Performance Data:
Line Regulation (∆V
Load Regulation (∆I
Note: R3 =
R3 May Be Eliminated For Minimum Component Count
R1 R2
R1 + R2
= 3V) 1.5mV
I
= 50mA) 4.5mV
L
For Minimum Temperature Drift
FIGURE 21. HIGH VOLTAGE REGULATOR CIRCUIT
(VO = 7V TO 37V)
7-8
CA723, CA723C
Typical Application Circuits
V+ V
V
R2
REF
R4
3kΩ
R1
NON
INV.
INPUT
R3
3kΩ
Circuit Performance Data:
Line Regulation (∆VI = 3V) 1mV
Load Regulation (∆IL = 100mA) 2mV
Note: For Applications Employing the TO-5 Style Package
and Where V
Should be Connected in Series with V
Is Required, An External; 6.2V Zener Diode
Z
C
CURRENT
LIMIT
CURRENT
SENSE
INV.
INPUT
V- COMP
C1
100pF
(Continued)
R5
2kΩ
V
Z
V
O
(Terminal 6).
O
V
I
REGULATED
OUTPUT-15V
V
I
V
C
V
CURRENT
LIMIT
CURRENT
SENSE
INV.
INPUT
COMP
V-
C1
100pF
V
NON
INV
INPUT
V+
REF
Circuit Performance Data:
Line Regulation (∆VI = 3V) 1.5mV
Load Regulation (∆IL = 1A) 15mV
O
SCP
REGULATED
OUTPUT 15V
R1
R2
R
FIGURE 22. NEGATIVE VOLTAGE REGULATOR CIRCUIT FIGURE 23. POSITIVE VOLTAGE REGULATOR CIRCUIT (WITH
EXTERNAL n-p-n PASS TRANSISTOR)
V
I
R1
R2
V
REF
NON
INV
INPUT
V+
R3
60Ω
V
C
V
O
CURRENT
LIMIT
CURRENT
SENSE
INV.
INPUT
COMP
V-
C1
0.001µF
2N5956
OR
2N6108
R
SCP
REGULATED
OUTPUT 5V
Circuit Performance Data:
Line Regulation (∆V
Load Regulation (∆I
= 3V) 0.5mV
I
= 1A) 5mV
L
FIGURE 24. POSITIVE VOLTRAGE REGULATOR CIRCUIT
(WITH EXTERNAL p-n-p PAS TRANSISTOR)
V
I
R
SCP
30Ω
R4
5.6kΩ
REGULATED
OUTPUT 5V
R1
R2
V
REF
NON
INV
INPUT
V+ V
C
CURRENT
LIMIT
CURRENT
SENSE
V- COMP
C1
0.001µF
V
O
INV.
INPUT
R3
2.7kΩ
Circuit Performance Data:
Line Regulation (∆V = 3V) 0.5mV
Load Regulation (∆I
Short Circuit Current 20mA
= 10mA) 1mV
L
FIGURE 25. FOLDBACK CURRENT LIMITING CIRCUIT
7-9
CA723, CA723C
Typical Application Circuits
REF
R1
R2
V+ V
V-
COMP
L
= 50mA) 20mV
V
R4
3kΩ
D1
12V
SK3062
R3
3kΩ
NON
INV.
INPUT
Circuit Performance Data:
Line Regulation (∆V = 20V) 15mV
Load Regulation (∆I
NOTE: For applications employing the TO-5 Style Package and
where VZ is required, an external 6.2V zener diode should
be connected in series with VO (terminal 6)
R5
3.9kΩ
C
V
O
V
Z
CURRENT
LIMIT
CURRENT
SENSE
INV.
INPUT
C1
0.001µF
(Continued)
VI = 85V
TI
2N3442
R
SCP
1Ω
REGULATED
OUTPUT-50V
R5
10kΩ
R2
D1
12V
SK3062
R1
V
Circuit Performance Data:
Line Regulation (∆V
Load Regulation (∆I
REF
NON
INV.
INPUT
R3
3kΩ
R4
3kΩ
V+ V
V-
COMP
C
V
O
V
Z
CURRENT
LIMIT
CURRENT
SENSE
INV.
INPUT
C1
0.001µF
= 20V) 30mV
I
=100mA) 20mV
L
R6
10kΩ
TI
2N6211
REGULATED
OUTPUT-100V
NOTE: For applications employing the TO-5 Style Package and
where VZ is required, an external 6.2V zener diode should
be connected in series with VO (terminal 6)
FIGURE 26. POSITIVE FLOATING REGULATOR CIRCUIT FIGURE 27. NEGATIVE FLOATING REGULATOR CIRCUIT
V
I
V
I
V+ V
R1
R2
V
REF
NON
INV
INPUT
C
V
O
CURRENT
LIMIT
CURRENT
SENSE
INV.
INPUT
COMP
V-
C1
0.001µF
R
SCP
R3
2kΩ
2N3053
NOTE 2
TI
REGULATED
OUTPUT 5V
R4
CCSL
LOGIC
2.kΩ
INPUT
Circuit Performance Data:
Line Regulation (∆V
Load Regulation (∆I
Short Circuit Current 20mA
NOTE: 1. A current limiting transistor may be used for shutdown if
current limiting is not required.
2. Add a diode if V
= 3V) 0.5mV
I
= 50mA) 1.5mV
L
> 10V.
O
FIGURE 28. REMOTE SHUTDOWN REGULATOR CIRCUIT WITH
CURRENT LIMITING
V
I
V+ V
R1
R2
V
REF
INV
INPUT
C
C
CURRENT LIMIT
CURRENT SENSE
V- COMP
C1
0.005µF
V
O
R3
100Ω
V
Z
NON INV.
INPUT
R4
100Ω
REGULATED
OUTPUT 5V
Circuit Performance Data:
Line Regulation (∆VI = 10V) 0.5mV
Load Regulation (∆IL = 100mA) 1.5mV
NOTE: For applications employing the TO-5 Style Package and
where V
should be connected in series with V
FIGURE 29. SHUNT REGULATOR CIRCUIT
is required, an external 6.2V zener diode
Z
(terminal 6).
O
7-10
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