SG337K Ver la hoja de datos (PDF) - Microsemi Corporation
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SG337K Datasheet PDF : 6 Pages
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CHARACTERISTIC CURVES
SG137A/SG137 SERIES
FIGURE 1.
INPUT/OUTPUT DIFFERENTIAL
VS. OUTPUT CURRENT
FIGURE 2.
REFERENCE VOLTAGE VS. TEMPERATURE
FIGURE 3.
CURRENT VS. INPUT/OUTPUT DIFFERENTIAL
FIGURE 4. *
OUTPUT VOLTAGE DEVIATION
VS. OUTPUT CURRENT
* The SG137A has load regulation compensation which
makes the typical unit read close to zero. This band
represents the typical production spread.
FIGURE 5.
INPUT/OUTPUT DIFFERENTIAL
VS. OUTPUT CURRENT
FIGURE 6.
ADJUSTMENT CURRENT VS. TEMPERATURE
APPLICATION INFORMATION
OUTPUT VOLTAGE
The output voltage is determined by two external resistors, R1 &
R2(see Figure 7).
FIGURE 6
The exact formula for the output voltage is:
( ) V = V
OUT
REF
R +R
2
1
R
+ I (R )
ADJ 2
1
Where: VREF =Reference Voltage, IADJ = Adjustment Pin Current.
In most applications, the second term is small enough to be
ignored, typically about 0.5% of V . In more critical applica-
OUT
tions, the exact formula should be used, with IADJ equal to 65µA.
Solving for R2 yields:
R2 =
VOUT - VREF
VREF
R1
+ IADJ
Smaller values of R1 and R2 will reduce the influence of IADJ on the
output voltage, but the no-load current drain on the regulator will
be increased. Typical values for R1 are between 100Ω and 300Ω,
giving 12.5 mA and 4.2mA no-load current respectively. There
is an additional consideration in selecting R the minimum load
1
current specification of the regulator. The operating current of
2/92 Rev 1.1 2/94
Copyright © 1994
LINFINITY Microelectronics Inc.
4
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
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