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零件编号 | L7908ACD2T | ||
描述 | 2% NEGATIVE VOLTAGE REGULATORS | ||
制造商 | STMicroelectronics | ||
LOGO | |||
1 Page
L7900AC
® SERIES
2% NEGATIVE VOLTAGE REGULATORS
s OUTPUT CURRENT UP TO 1.5 A
s OUTPUT VOLTAGES OF -5; -5.2; -6; -8; -12;
-15; -18; -20; -22; -24V
s THERMAL OVERLOAD PROTECTION
s SHORT CIRCUIT PROTECTION
s OUTPUT TRANSITION SOA PROTECTION
DESCRIPTION
The L7900AC series of three-terminal negative
regulators is available in TO-220 and D2PAK
packages and several fixed output voltages.
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 L7800A positive standard series, they are
particularly suited for split power supplies. In
addition, the -5.2V is also available for ECL
system. If adequate heat sinking is provided,
they can deliver over 1.5A output current.
Although designed primarily as fixed voltage
regulators, these devices can be used with
external components to obtain adjustable
voltages and currents.
SCHEMATIC DIAGRAM
3
1
D2PAK
TO-220
November 1999
1/11
L7900AC
APPLICATION INFORMATION
Figure 1 : Fixed Output Regulator.
Figure 2 : Split Power Supply (± 15V/1A).
Notes :
1. To specify an output voltage, substitute voltage value for ”XX”.
2. Required for stability. For value given, capacitor must be solid
tantalum. If aluminium electrolitics are used, at least ten times
value should be selected. C1 is required if regulator is located an
appreciable distance from power supply filter.
3. To improve transient response. If large capacitors are used, a
high current diode from input to output (1N4001 or similar) should
be introduced to protect the device from momentary input short
circuit.
Against potential latch-up problems.
Figure 3 : Circuit for Increasing Output Voltage.
Figure 4 : High Current Negative Regulator
(– 5V/4A with 5A current limiting).
VO
=
V
XX
R
1+R
R2
2
V XX
R2
>
3I
d
C3 Optional for improved transient response and ripple rejection.
Figure 5 : Typical ECL System Power Supply
(– 5.2V/4A).
Optional dropping resistor to reduce the power dissipated in the
boost transistor.
8/11
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页数 | 11 页 | ||
下载 | [ L7908ACD2T.PDF 数据手册 ] |
零件编号 | 描述 | 制造商 |
L7908ACD2T | 2% NEGATIVE VOLTAGE REGULATORS | STMicroelectronics |
L7908ACD2T | NEGATIVE VOLTAGE REGULATORS | STMicroelectronics |
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