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參數資料
| 型號： | 79XX |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | NEGATIVE VOLTAGE REGULATORS |
| 中文描述： | 負電壓調節器 |
| 文件頁數： | 8/16頁 |
| 文件大小： | 414K |
| 代理商： | 79XX |
L7900 SERIES
8/16
ELECTRICAL CHARACTERISTICS OF L7924C
(refer to the test circuits, T
J
= 0 to 125°C, V
I
= -33V,
I
O
= 500 mA, C
I
= 2.2 μF, C
O
= 1 μF unless otherwise specified).
(*) Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
APPLICATIONS INFORMATION
Figure 1 :
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
V
O
V
O
Output Voltage
Output Voltage
T
J
= 25°C
I
O
= -5 mA to -1 A
V
I
= -27 to -38 V
V
I
= -27 to -38 V
V
I
= -30 to -36 V
I
O
= 5 mA to 1.5 A
I
O
= 250 to 750 mA
T
J
= 25°C
I
O
= 5 mA to 1 A
V
I
= -27 to -38 V
I
O
= 5 mA
B = 10Hz to 100KHz
V
I
= 10 V
I
O
= 1 A
-23
-22.8
-24
-24
-24.5
-25.2
V
V
P
O
≤
15 W
V
O
(*)
Line Regulation
T
J
= 25°C
T
J
= 25°C
T
J
= 25°C
T
J
= 25°C
480
240
480
240
3
0.5
1
mV
V
O
(*)
Load Regulation
mV
I
d
I
d
Quiescent Current
Quiescent Current Change
mA
mA
V
O
/
T Output Voltage Drift
eN
Output Noise Voltage
SVR
Supply Voltage Rejection
V
d
Dropout Voltage
I
sc
Short Circuit Current
-1
400
60
1.1
1.1
mV/°C
μ
V
dB
V
A
T
J
= 25°C
f = 120Hz
T
J
= 25°C
54
V
O
= 100 mV
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