L7900AC datasheet(7/13 Pages) STMICROELECTRONICS

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L7900AC SERIES

7/13

Table 11: Electrical Characteristics Of L7924A (refer to the test circuits, TJ = 0 to 125°C, VI = -33V,

IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified).

(*) 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.

APPLICATIONS INFORMATION

Figure 3: Fixed Output Regulator

NOTE:

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 electrolytics 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 intro-

duced to protect the device from momentary input short circuit.

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Output Voltage

TJ = 25°C

-23.5

-24

-24.5

Output Voltage

IO = -5 mA to -1 A

PO ≤ 15W

VI = -27 to -38 V

-23

-24

-25

∆V

O(*)

Line Regulation

VI = -27 to -38 V

TJ = 25°C

480

VI = -30 to -36 V

TJ = 25°C

240

∆V

O(*)

Load Regulation

IO = 5 mA to 1.5 A

TJ = 25°C

480

IO = 250 to 750 mA

TJ = 25°C

240

Quiescent Current

TJ = 25°C

∆I

Quiescent Current Change

IO = 5 mA to 1 A

0.5

VI = -27 to -38 V

∆V

O/∆T

Output Voltage Drift

IO = 5 mA

-1

mV/°C

Output Noise Voltage

B = 10Hz to 100KHz

TJ = 25°C

400

µV

SVR

Supply Voltage Rejection

∆V

I = 10 V f = 120Hz

Dropout Voltage

IO = 1 A

TJ = 25°C

∆V

O = 100

1.1

Isc

Short Circuit Current

1.1

Iscp

Short Circuit Peak Current

TJ = 25°C

2.2

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