923

NTE923 & NTE923D
Integrated Circuit
Precision Voltage Regulator
Description:
The NTE923 and NTE923D are voltage regulators designed primarily for series regulator applications. By themselves, these devices will supply output currents up to 150mA; but, external transistors
can be added to provide any desired load current. The circuits feature extremely low standby current
drain, and provision is made for either linear or foldback current limiting.
These devices are also useful in a wide range of other applications such as shunt regulators, current
regulators, and temperature controllers.
Features:
D 150mA Output Current without External Pass Transistor
D Output Currents in Excess of 10A Possible by Adding External Transistors
D Input Voltage: 40V Max
D Output Voltage Adjustable from 2V to 37V
D Can be Used as Either a Linear or a Switching Regulator
Absolute Maximum Ratings:
Pulse Voltage from V+ to V− (50ms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V
Continuous Voltage from V+ to V− . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Input−Output Voltage Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Maximum Amplifier Input Voltage
Either Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.5V
Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0V
Current from VZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA
Current from VREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA
Internal Power Dissipation
NTE923 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mW
NTE923D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 660mW
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
Storage Temperature Range
NTE923 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65° to +150°C
NTE923D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55° to +150°C
Lead Temperature (During Soldering, 4sec max)
NTE923 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C
NTE923D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260°C
Electrical Characteristics: (Note 1)
Parameter
Test Conditions
Line Regulation
Min
Typ
Max
Unit
−
0.01
0.1
% VOUT
−
−
0.3
% VOUT
VIN = 12V to 40V
−
0.1
0.5
% VOUT
IL = 1mA to 50mA
−
0.03
0.2
% VOUT
0° ≤ TA ≤ +70°C
−
−
0.6
% VOUT
CREF = 0
−
74
−
dB
CREF = 5µF
−
86
−
dB
VIN = 12V to 15V
0° ≤ TA ≤ +70°C
Load Regulation
Ripple Rejection
f = 50Hz to 10kHz
Average Temperature Coefficient of
Output Voltage
0° ≤ TA ≤ +70°C, Note 2
−
Short Circuit Current Limit
RSC = 10Ω, VOUT = 0
−
65
−
mA
6.80
7.15
7.50
V
−
86
−
µVrms
−
2.5
−
µVrms
−
0.05
−
%/1000Hrs
−
1.7
4.0
mA
Input Voltage Range
9.5
−
40
V
Output Voltage Range
2.0
−
37
V
Input−Output Voltage Differential
3.0
−
38
V
−
105
−
°C/W
Board mount in still air
−
225
−
°C/W
Board mount in 400LF/Min Air flow
−
90
−
°C/W
−
25
−
°C/W
Reference Voltage
Output Noise Voltage
BW = 100Hz to 10kHz CREF = 0
CREF = 5µF
Long Term Stability
Standby Current Drain
IL = 0, VIN = 30V
Thermal Resistance, Junction to Ambient
NTE923D
NTE923
Thermal Resistance, Junction to Case
0.003 0.015
%/°C
Note 1. Unless otherwise otherwise specified, TA = +25°C, VIN = V+ = VC = 12V, V− = 0, VOUT = 5V,
IL = 1mA, RSC = 0, C! = 100pF, CREF = 0 and divider impedance as seen by error amplifier
≤ 10kΩ. Line and load regulation specifications are given for the condition of constant chip
temperature. Temperature drifts must be taken into account separately for high dissipation
conditions.
Note 2. Guaranteed by correlation to other tests.
Note 3. For metal can applications where VZ is required, an external 6.2V zener diode should be connected in series with VOUT.
Pin Connection Diagram
NTE923
(Top View)
VC
7
V (+)
6
NTE923D
Vout
5
8
Freq Comp 9
V (−)/Case
4 Vref
Current Limit 10
3
1
Current Sense
2
Non−Invert Input
N.C.
1
14 N.C.
Current Limit
2
13 Freq Comp
Current Sense
3
12 V (+)
Invert Input
4
11 VC
Non−Invert Input
5
10 Vout
Vref 6
V (−)
Invert Input
7
9 VZ
8
N.C.
TABLE 1. Resistor Values (kW) for Standard Output Voltage:
Output
Voltage
+3.0
Fixed
Output
+5%
Applicable
Figures
Output
Adjustable
+10% (Note 5)
R2
R1
P1
R2
1, 5, 6, 9, 12 (4)
4.12 3.01
1.8
0.5
1.2
Output
Voltage
+100
+3.6
1, 5, 6, 9, 12 (4)
3.57 3.65
1.5
0.5
1.5
+5.0
1, 5, 6, 9, 12 (4)
2.15 4.99 0.75
0.5
+6.0
1, 5, 6, 9, 12 (4)
1.15 6.04
0.5
+9.0
(Note 4)
Fixed
Output
+5%
Applicable
Figures
Output
Adjustable
+10% (Note 5)
(Note 4)
R1
R2
R1
P1
R2
7
3.57
102
2.2
10
91
+250
7
3.57
255
2.2
10
240
2.2
−6 (Note 6)
3, (10)
3.57 2.43
1.2
0.5
0.75
0.5
2.7
−9
3, 10
3.48 5.36
1.2
0.5
2.0
2, 4, (5, 6, 9, 12) 1.87 7.15 0.75
1.0
2.7
−12
3, 10
3.57 8.45
1.2
0.5
3.3
+12
2, 4, (5, 6, 9, 12) 4.87 7.15
2.0
1.0
3.0
−15
3, 10
3.65 11.5
1.2
0.5
4.3
+15
2, 4, (5, 6, 9, 12) 7.87 7.15
3.3
1.0
3.0
−28
3, 10
3.57 24.3
1.2
0.5
10
+28
2, 4, (5, 6, 9, 12) 21.0 7.15
5.6
1.0
2.0
−45
8
3.57 41.2
2.2
10
33
R1
+45
7
3.57 48.7
2.2
10
39
−100
8
3.57 97.6
2.2
10
91
+75
7
3.57 78.7
2.2
10
68
−250
8
3.57
2.2
10
240
249
Note 4. Figures in parentheses may be used if R1/R2 divider is placed on opposite input of error amp.
Note 5. Replace R1/R2 in figures with divider shown in Figure .
Note 6. V+ and VCC must be connected to a +3V or greater supply.
TABLE 2. Formulae for Intermediate Output Voltages:
Outputs from +2 to +7 Volts
(Figures 1, 4, 5, 6, 9, 12)
(
VOUT = VREF x
R2
R1 + R2
Outputs from +4 to +250 Volts
(Figure 7)
)
VOUT =
(
REF
x
R2 − R1
R1
) ; R3 = R4
Outputs from −6 to −250 Volts
(Figures 3, 8, 10)
Outputs from +7 to +37 Volts
(Figures 2, 4, 5, 6, 9, 12)
R1 + R2
VOUT = VREF x
R2
(V2
Current Limiting
)
VOUT =
(
VREF
R1 + R2
x
2
R1
ILIMIT =
VSENSE
RSC
Foldback Current Limiting
) ; R3 = R4
( VR
V
R3
(R3 + R4)
+ SENSE
RSC R4
SC R4
VSENSE
R3 + R4
ISHORT CKT =
x
R4
RSC
IKNEE =
OUT
(
)
Typical Applications: (Pin numbers relative to the plastic package)
Figure 1. Basic Low Voltage Regultor
(VOUT = 2 to 7 Volts)
Figure 2. Basic High Voltage Regultor
(VOUT = 27to 37 Volts)
VIN
V+
VIN
VCC
V+
VOUT
VREF
CL
R1
VREF
RSC
REGULATED
OUTPUT
CREF
R2
V−
INV
COMP
VOUT
CL
R3
CS
N.I.
VCC
RSC
R3
N.I.
C1 100pF
V−
R1
INV
COMP
R2
C1
100pF
R1 x R2
R1 + R2
for minimum temperature drift.
R3 may be eliminated for
minimum component count.
Note: R3 =
R1 x R2
R1 + R2
for minimum temperature drift.
Note: R3 =
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 3V)
Load Regulation (∆IL = 50mA)
5V
0.5mV
1.5mV
REGULATED
OUTPUT
CS
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 3V)
Load Regulation (∆IL = 50mA)
15V
1.5mV
4.5mV
)
Figure 3. Negative Voltage Regultor
Figure 4. Positive Voltage Regultor
(External NPN Pass Transistor)
VIN
VIN
V+
VCC
R2
VREF
VOUT
R4
3K
N.I.
R1
CL
CL
CS
CS
COMP
T1
NTE175
VOUT
VREF
INV
V−
VCC
T1
NTE218
VZ
R3
3K
V+
R5
2K
N.I.
C1
100pF
RSC
REGULATED
OUTPUT
R1
INV
V−
COMP
C1
100pF
R2
REGULATED
OUTPUT
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 3V)
Load Regulation (∆IL = 100mA)
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 3V)
Load Regulation (∆IL = 1A)
−15V
1mV
2mV
Figure 5. Positive Voltage Regultor
(External PNP Pass Transistor)
+15V
1.5mV
15mV
Figure 6. Foldback Current Limiting
VIN
VIN
R3
60
V+
T1
NTE218
VCC
VREF
V+
VOUT
VREF
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 3V)
Load Regulation (∆IL = 1A)
RSC
CS
REGULATED
OUTPUT
INV
V−
R2
N.I.
COMP
C1 1nF
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 3V)
Load Regulation (∆IL = 10mA)
Short Circuit Current
Figure 7. Positive Floating Regultor
R4
5.6K
INV
V−
R2
+5V
0.5mV
5mV
COMP
C1 1nF
+5V
0.5mV
1mV
20mA
Figure 8. Negative Floating Regultor
VIN
VIN
R5 200
V+
V+
VOUT
R4
3.0K
R1
R2
V−
R2
R6
1Ω
CS
R3
3.0K
D1 12V
NTE142A
T1
NTE130
CL
N.I.
R1
CS
R4
3K
V−
REGULATED
OUTPUT
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 20V)
Load Regulation (∆IL = 100mA)
+50V
30mV
20mV
T1
2N5287
CL
N.I.
C1
100pF
R6
10K
VOUT
VZ
R3
3K
INV
COMP
VCC
VREF
VZ
D1 36V
NTE5204A
R5 10K
VCC
VREF
REGULATED
OUTPUT
CL
R1
CS
N.I.
RSC
30
VOUT
R3
2.7K
CL
R1
VCC
INV
COMP
C1
100pF
REGULATED
OUTPUT
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 20V)
Load Regulation (∆IL = 100mA)
−100V
30mV
20mV
Figure 9. Positive Switching Regultor
Figure 10. Negative Switching Regultor
VIN
VIN
100
R5
3K
V+
T2
2N5153
VCC
VREF
R1
T1
NTE129
VOUT
R5
100
V+
D1
NTE116
CL
VREF
L1
1.2mH
R6
51
REGULATED
OUTPUT
C1
0.1µF
R2
R2
C1
0.1µF
N.I.
R4
1M
V−
R6
220
VOUT
D1
NTE116
T1
NTE129
VZ
CL
CS
R3 1K
T2
NTE196
1K
VCC
L1
1.2mH
CS
R3 1K
C2 100µF
INV
COMP
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 30V)
Load Regulation (∆IL = 2A)
R1
N.I.
R4
1M
V−
COMP
C1 15pF
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 20V)
Load Regulation (∆IL = 2A)
+5V
10mV
80mV
REGULATED
OUTPUT
INV
C2
100µF
−15V
8mV
6mV
Figure 12. Shunt Regulator
Figure 11. Remote Shutdown Regulator with Current Limiting
VIN
VIN
V+
R4
100
REGULATED
OUTPUT
VCC
VREF
VOUT
RSC
REGULATED
OUTPUT
VREF
R2
V−
T1
C1 NTE123A
1nF
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 3V)
Load Regulation (∆IL = 50mA)
CS
INV
R3
COMP 2K
CL
R1
CS
N.I.
R3 100
VZ
CL
R1
VOUT
N.I.
R4
2K
R4
V−
LOGIC INPUT
Typical Performance
Regulated Output Voltage
Line Regulation (∆VIN = 10V)
Load Regulation (∆IL = 100mA)
+5V
0.5mV
1.5mV
Figure 13. Output Voltage Adjust
(Note 6)
VREF
R1
P1
R2
NON−INVERTING
INPUT
+5V
0.5mV
1.5mV
INV
COMP
C1 5nF
T1
NTE175
NTE923
.335 (8.52) Dia Max
.260
(6.6)
Max
.500
(12.7)
Min
.018 (0.45) Dia Typ
2
.115 (2.92)
4
3
5
6
1
10
9
8
.370
(9.4)
Max
7
.230 (5.84) Dia
NTE923D
14
8
1
7
.785 (19.95) Max
.300 (7.62)
.200 (5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min