L4962/A Просмотр технического описания (PDF) - STMicroelectronics
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L4962/A Datasheet PDF : 16 Pages
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PIN FUNCTIONS (cont’d)
HEPTAWATT POWERDIP NAME
4
4, 5, 12, 13 GROUND
5
14
OSCILLATOR
6
15
SOFT START
7
2
OUTPUT
1, 3, 6,
8, 9, 16
L4962
FUNCTION
Common ground terminal.
A parallel RC network connected to this terminal
determines the switching frequency. This pin must be
connected to pin 7 input when the internal oscillator is
used.
Soft start time constant. A capacitor is connected
between this terminal and ground to define the soft start
time constant. This capacitor also determines the
average short circuit output current.
Regulator output.
N.C.
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tj = 25 °C, Vi = 35V, unless otherwise
specified)
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
DYNAMIC CHARACTERISTICS
Vo Output voltage range
Vi = 46V
Io = 1A
Vi Input voltage range
Vo = Vref to 36V
Io = 1.5A
∆ Vo Line regulation
Vi = 10V to 40V Vo = Vref Io = 1A
∆ Vo Load regulation
Vo = Vref
Io = 0.5A to 1.5A
Vref Internal reference voltage Vi = 9V to 46V
(pin 10)
Io = 1A
∆ Vref Average temperature
Tj = 0°C to 125°C
∆ T coefficient of refer. voltage Io = 1A
Vd Dropout voltage
Io = 1.5A
Iom Maximum operating load Vi = 9V to 46V
current
Vo = Vref to 36V
I2L Current limiting threshold Vi = 9V to 46V
(pin 2)
Vo = Vref to 36V
ISH Input average current
Vi = 46V; output short-circuit
η
Efficiency
f = 100KHz
Vo = Vref
Io = 1A
Vo = 12V
SVR Supply voltage ripple
rejection
∆ Vi = 2Vrms
fripple = 100Hz
Vo = Vref
Io = 1A
Vref
40
V
9
46
V
15
50 mV
8
20 mV
5
5.1 5.2
V
0.4
mV/°C
1.5
2
V
1.5
A
2
3.3
A
15
30 mA
70
%
80
%
50
56
dB
3/16
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