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UA723C Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer UA723C
Beschreibung Precision voltage regulator
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 6 Seiten
UA723C Datasheet, Funktion
Philips Semiconductors
www.DataSheet4U.com
Precision voltage regulator
Product specification
µA723/723C
DESCRIPTION
The µA723/µA723C is a monolithic precision voltage regulator
capable of operation in positive or negative supplies as a series,
shunt, switching, or floating regulator. The 723 contains a
temperature-compensated reference amplifier, error amplifier, series
pass transistor, and current limiter, with access to remote shutdown.
FEATURES
Positive or negative supply operation
Series, shunt, switching, or floating operation
0.01% line and load regulation
Output voltage adjustable from 2V to 37V
Output current to 150mA without external pass transistor
µA723 MIL-STD-883A, B, C available
PIN CONFIGURATION
D,F, N Packages
NC 1
CURRENT LIMIT 2
CURRENT SENSE 3
INVERTING INPUT 4
NON-INVERTING INPUT 5
VREF 6
V– 7
14 NC
13 FREQUENCY COMPENS.
12 V+
11 VC
10 VOUT
9 VZ
8 NC
SL00503
Figure 1. Pin Configuration
ORDERING INFORMATION
DESCRIPTION
14-Pin Ceramic Dual In-Line Package (CERDIP)
14-Pin Plastic Dual In-Line Package (DIP)
14-Pin Plastic Small Outline (SO) Package
TEMPERATURE RANGE
-55°C to 125°C
0 to 70°C
0 to 70°C
ORDER CODE
µA723F
µA723CN
µA723CD
DWG #
0581B
SOT27-1
SOT108-1
EQUIVALENT CIRCUIT
TEMPERATURE
COMPENSATED
ZENER
12 V+
VIN
FREQUENCY
COMPENSATION
13
11 VC
VREF
8
INVERTING
INPUT
4
ERROR AMP
NON INVERTING
INPUT
+
SERIES PASS
TRANSISTOR
10
VOUT
7 V–
VOLTAGE
REFERENCE
AMPLIFIER
2
CURRENT
LIMIT
Figure 2. Equivalent Circuit
3 CURRENT
SENSE
9 VZ
SL00504
1994 Aug 31
1 853-1063 13721






UA723C Datasheet, Funktion
www.PDhailitpasSSheemeicto4nUdu.ccotomrs
Precision voltage regulator
Product specification
µA723/723C
TYPICAL APPLICATIONS (Continued)
VIN
V+ VC
VREF VOUT
RSC
R1 CL
CS
N.I. INV
V– COMP
R3
R2
2k
C1
Q1
1nF
R4
2k
REGULATED
OUTPUT
LOGIC INPUT
VIN
V+ VC
VREF VOUT
R3 CL
CS
N.I. INV
RSC
REGULATED
OUTPUT
R1
V– COMP
C1 100pF
R2
NOTE:
ƪ ƫR2
VOUT + VREF x R1 ) R2
Remote Shutdown Regulator With Current
Limiting (VOUT = 2 to 7V)
VIN
VC
VREF VOUT
VZ
R1 CL
CS
N.I. INV
R2
V–
COMP
C1
1nF
RSC
R3
R4
REGULATED
OUTPUT
NOTES:
ƪ ƫVOUT R3
VSENSE (R3 ) R4)
IKNEE + RSC R4 )
RSC R4
ƪ ƫR1 ) R2
VOUT + VREF X
R4
ƪ ƫVSENSE R3 ) R4
ISHORT CKT +
RSC X
R4
NOTE:
ƪ ƫR2
VOUT + VREF x R1 ) R2 ; R3 + R4
R1 R2
R3 + R1 ) R2 for minimum temperature drift
R3 may be eliminated for minimum component count
High Voltage Regulator (VOUT = 7 to 37V)
16
14
RSC = 3.4
R4 = 3.6k
12 R3 = 500
IKNEE
10
8
6
4
2
0 ISHORT
0 10 20 30 40 50 60
OUTPUT CURRENT — mA
NOTES:
R4 VOUT ISC
R3 + VSENSE (IKNEE – ISHORT CKT) – 1
ƪ ƫVSENSE
RSC + ISC
R3
1 ) R4
Foldback Current Limiting Regulator (VOUT = 2 to 7V)
Figure 6. Typical Applications (cont.)
SL00508
1994 Aug 31
6

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