L4972A Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
L4972A Datasheet PDF : 22 Pages
| |||
L4972A
Table 5. Electrical Characteristcs (continued)
Refer to the test circuit, TJ = 25°C, Vi = 35V, R4 = 30KΩ, C9 = 2.7nF, fSW = 100KHz typ, unless otherwise
specified.
Symbol
Parameter
Test Condition
I20L Out Leak Current
Vi = 55V; S3 = A; V8= 0
SOFT START (pin 8)
I8 Soft Start Source Current
V8 = 3V; V9= 0V
V8 Output Saturation Voltage
I8 = 20mA; V11= 10V
I8= 200µA; V11= 10V
ERROR AMPLIFIER
V7H High Level Out Voltage
I7 = 100µA; S1 = C; V9 = 4.7V
V7L Low Level Out Voltage
I7 = 100µA; S1 = C; V9= 5.3V
I7H Source Output Current
V7 = 1V; V7 = 4.7V
-I7L Sink Output Current
V7 = 6V; V9 = 5.3V
I9 Input Bias Current
S1 = B; RS = 10KΩ
GV DC Open Loop Gain
S1 = A; RS= 10Ω
SVR Supply Voltage Rejection
15 < Vi < 50V
VOS Input Offset Voltage
RS= 50Ω S1 = A
RAMP GENERATOR (pin 18)
V18 Ramp Valley
S1 = B; S2 = B
V18 Ramp Peak
S1 = B; S2 = B
Vi = 15V
Vi = 45V
I18 Min. Ramp Current
S1 = A; I17= 100µA
I18 Max. Ramp Current
S1 = A; I17= 1mA
SYNC FUNCTION (pin 10)
V10 Low Input Voltage
Vi = 15V to 50V; V8 = 0;
S1 = B; S2 = B; S4 = B
V10 High Input voltage
V8 = 0; S1 = B; S2 = B; S4 = B
I10L Sync Input Current with Low
Input Voltage
V10= V18= 0.9V; S4 = B;
S1 = B; S2 = B
I10H Input Current with High
Input Voltage
V10= 2.5V
V10 Output Amplitude
tW Output Pulse Width
Vthr = 2.5V
RESET AND POWER FAIL FUNCTIONS
V9R Rising Thereshold Voltage (pin 9) Vi = 15 to 50V
V4 = 5.3V
V9F Falling Thereshold Voltage (pin 9) Vi = 15 to 50V
V4 = 5.3V
V2H Delay High Threshold Volt.
Vi = 15 to 50V
V4 = 5.3V; V9 = V13
V2L Delay Low Threshold Volt.
Vi = 15 to 50V;V4 = 4.7V; V9 = V13
I2SO Delay Source Current
V4 = 5.3V; V2 = 3V
I2SI Delay Source Sink Current
V4 = 4.7V; V2 = 3V
V3S Output Saturation Voltage
I3 = 15mA; S1 = B V4 = 4.7V
I3 Output Leak Current
V3 = 50V; S1 = A
Min.
80
6
100
100
60
60
1.2
2.4
–0.3
2.5
4
0.3
Vref
-130
4.77
4.95
1
30
10
Typ.
115
150
150
0.4
80
2
1.5
2.5
5.5
270
2.7
5
0.5
Vref
-100
Vref
-200
5.1
1.1
60
Max.
2
150
1
0.7
1.2
3
10
300
0.9
5.5
0.4
1.5
0.8
Vref
-80
Vref
-160
5.25
1.2
80
0.4
100
Unit Fig.
mA 12
µA 13
V
13
V
13
V
14
V
14
µA 14
µA 14
µA 14
dB 14
dB 14
mV 14
V
12
V
12
V
12
µA 12
mA 12
V
12
V
12
mA 12
mA 12
V
–
µs
–
V
15
mV
V
15
mV
V
15
V
15
µA 15
mA 15
V
15
µA 15
7/22
Share Link: 