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Teilenummer | 7915CV |
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Beschreibung | Negative voltage regulators | |
Hersteller | STMicroelectronics | |
Logo | ||
Gesamt 24 Seiten L7900 series
Negative voltage regulators
Feature summary
■ Output current up to 1.5A
■ Output voltages of -5; -6; -8; -12; -15; -18; -20;
-24V
■ Thermal overload protection
■ Short circuit protection
■ Output transition SOA protection
Description
The L7900 series of three-terminal negative
regulators is available in TO-220, TO-220FP, TO-3
and D2PAK packages and several fixed output
voltages, making it useful in a wide range of
applications. These regulators can provide local
on-card regulation, eliminating the distribution
problems associated with single point regulation;
furthermore, having the same voltage option as
the L7800 positive standard series, they are
particularly suited for split power supplies. If
adequate heat sinking is provided, they can
deliver over 1.5A output current.
Schematic diagram
TO-220
TO-220FP
D2PAK
TO-3
Although designed primarily as fixed voltage
regulators, these devices can be used with
external components to obtain adjustable
voltages and currents.
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January 2007
Rev. 11
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24
Electrical characteristics
4 Electrical characteristics
L7900 series
Table 3.
Symbol
Electrical characteristics of L7905C (refer to the test circuits, TJ = 0 to 125°C, VI = -10V,
IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
Parameter
Test conditions
Min. Typ. Max. Unit
VO Output voltage
TJ = 25°C
-4.8 -5 -5.2 V
VO Output voltage
IO = -5 mA to -1 A, PO ≤15 W
VI = -8 to -20 V
-4.75 -5 -5.25 V
∆VO(1) Line regulation
VI = -7 to -25 V, TJ = 25°C
VI = -8 to -12 V, TJ = 25°C
100
mV
50
∆VO(1) Load regulation
IO = 5 mA to 1.5 A, TJ = 25°C
IO = 250 to 750 mA, TJ = 25°C
100
mV
50
Id Quiescent current
TJ = 25°C
3 mA
∆Id Quiescent current change IO = 5 mA to 1 A
VI = -8 to -25 V
0.5
mA
1.3
∆VO/∆T Output voltage drift
IO = 5 mA
-0.4 mV/°C
eN Output noise voltage
B = 10Hz to 100KHz, TJ = 25°C
100 µV
SVR Supply voltage rejection ∆VI = 10 V, f = 120Hz
54 60
dB
Vd Dropout voltage
IO = 1 A, TJ = 25°C, ∆VO = 100 mV
1.4 V
Isc Short circuit current
2.1 A
1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
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6 Page Application information
Figure 5. Circuit for increasing output voltage
L7900 series
VO=VXX(R1+R2)/R2
VXX/R2 > 3Id
C3 Optional for improved transient response and ripple rejection.
Figure 6. High current negative regulator (-5V/4A with 5A current limiting)
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12 Page | ||
Seiten | Gesamt 24 Seiten | |
PDF Download | [ 7915CV Schematic.PDF ] |
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