LINFINITY SG120 Service Manual
SG120
NEGATIVE FIXED VOLTAGE REGULATOR
DESCRIPTION
The SG120 series of negative regulators offer self-contained, fixed-voltage
capability with up to 1.5A of load current. With a variety of output voltages and four
package options this regulator series is an optimum complement to the SG7800A/
7800/120 line of three terminal regulators.
All protective features of thermal shutdown, current limiting, and safe-area control
have been designed into these units and since these regulators require only a
single output capacitor or a capacitor and 5mA minimum load for satisfactory
performance, ease of application is assured.
Although designed as fixed-voltage regulators, the output voltage can be increased through the use of a simple voltage divider. The low quiescent drain
current of the device insures good regulation when this method is used, especially
for the SG120 series. Utilizing an improved Bandgap reference design, problems
have been eliminated that are normally associated with the zener diode references, such as drift in output voltage and large changes in the line and load
regulation
These devices are available in TO-257 (hermetically sealed TO-220), both
isolated and non-isolated), TO-3, TO-39 and TO-66 power packages.
SCHEMATIC DIAGRAM
FEATURES
••
• Output current to 1.5A
••
••
• Excellent line and load regulation
••
••
• Foldback current limiting
••
••
• Thermal overload protection
••
••
• Voltages available: -5V, -12V, -15V
••
••
• Voltages Not Recommended For New
••
Designs: -5.2V, -8V, -18V, -20V
••
• Contact factory for other voltage
••
options
HIGH RELIABILITY FEATURES
- SG120
♦♦
♦ Available to MIL-STD - 883
♦♦
♦♦
♦ Radiation data available
♦♦
♦♦
♦ LMI level "S" processing available
♦♦
11/91 Rev 1.4 6/97 LINFINITY Microelectronics Inc.
Copyright 1997 11861 Western Avenue
1 (714) 898-8121
∞ ∞
∞ Garden Grove, CA 92841
∞ ∞
∞∞
∞ FAX: (714) 893-2570
∞∞
SG120
ABSOLUTE MAXIMUM RATINGS (Note 1)
Device Input Voltage Differential
Output Voltage Input Voltage (Output shorted to ground)
-5V -35V 35V
-5.2V -35V 35V
-8V -35V 35V
-12V -35V 35V
-15V -40V 35V
-18V -40V 35V
-20V -40V 35V
NEGATIVE REGULATOR
Operating Junction Temperature
Hermetic (K, R, IG - Packages) ...................................
Note 1. Values beyond which damage may occur.
150°C
THERMAL DATA
K Package:
Thermal ResistanceThermal Resistance-
R Package:
Junction to Case, θ
Junction to Ambient, θ
................. 3.0°C/W
JC
............... 35°C/W
JA
Thermal Resistance-Junction to Case, θJC................. 5.0°C/W
Thermal Resistance-Junction to Ambient, θJA.............. 40°C/W
T Package:
Thermal Resistance-Junction to Case, θJC.................. 15°C/W
Thermal Resistance-Junction to Ambient, θJA............ 120°C/W
IG Package:
Thermal Resistance-Junction to Case, θJC................. 3.5°C/W
Thermal Resistance-Junction to Ambient, θJA.............. 42°C/W
L Package:
Thermal Resistance-Junction to Case, θJC.................. 35°C/W
Thermal Resistance-Junction to Ambient, θJA............ 120°C/W
RECOMMENDED OPERATING CONDITIONS (Note 2)
Operating Junction Temperature Range:
SG120 ...........................................................
-55°C to 150°C
Storage Temperature Range ...........................
-65°C to 150°C
Lead Temperature (Soldering, 10 Seconds) .................
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for θ
resistance of the package in a standard mounting configuration.
The θJA numbers are meant to be guidelines for the thermal
performance of the device/pc-board system. All of the above
assume no ambient airflow.
are maximums for the limiting thermal
JC
300°C
Note 2. Range over which the device is functional.
CHARACTERISTIC CURVES
FIGURE 1.
MAXIMUM AVERAGE POWER DISSIPATION
11/91 Rev 1.4 6/97 LINFINITY Microelectronics Inc.
Copyright 1997 11861 Western Avenue
FIGURE 2.
QUIESCENT CURRENT VS. LOAD
2 (714) 898-8121
FIGURE 3.
TEMPERATURE COEFFICIENT
∞ ∞
∞ Garden Grove, CA 92841
∞ ∞
∞∞
∞ FAX: (714) 893-2570
∞∞
SG120
CHARACTERISTIC CURVES (continued)
NEGATIVE REGULATOR
FIGURE 4.
SHORTCIRCUIT CURRENT VS. V
APPLICATIONS
IN
FIGURE 7.
DROPOUT CHARACTERISTICS
FIGURE 5.
QUIESCENT CURRENT VS. V
FIGURE 6.
IN
FIGURE 8.
RIPPLE REJECTION VS. FREQUENCY
SHORT CIRCUIT CURRENT VS. V
IN
FIGURE 9 - FIXED OUTPUT REGULATOR
NOTE: 1. C1 is required only if regulator is separated from rectifier filter.
2. Both C1 and C2 should be low E.S.R. types such as solid
tantalum. If aluminum electrolitics are used, at least 10 times
values shown should be selected.
3. If large output capacities are used, the regulators must be
NOTE: C3 optional for improved transient response and ripple
FIGURE 10 - CIRCUIT FOR INCREASING OUTPUT VOLTAGE
rejection.
R1 + R
2
V
= V (REGULATOR)
OUT
R
1
R2 =
V(REG)
15mA
protected from momentary input shorts. A high current diode
from output to input will suffice.
11/91 Rev 1.4 6/97 LINFINITY Microelectronics Inc.
Copyright 1997 11861 Western Avenue
3 (714) 898-8121
∞ ∞
∞ Garden Grove, CA 92841
∞ ∞
∞∞
∞ FAX: (714) 893-2570
∞∞
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