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PDF L4952 Data sheet ( Hoja de datos )
| Número de pieza | L4952 | |
| Descripción | VOLTAGE REGULATOR FOR CAR RADIO APPLICATIONS | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L4952 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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® L4952
VOLTAGE REGULATOR FOR CAR RADIO APPLICATIONS
OPERATION SUPPLY VOLTAGE 9.5 TO 28V
PEAK SUPPLY OVERVOLTAGE PULSE UP
TO 52V (VS. GND)
FIXED OUTPUT VOLTAGE OF 8.6 ± 0.2V
AND OUTPUT CURRENT UP TO 150mA
VERY LOW DROP OUTPUT STAGE WITH
LOW OUTPUT VOLTAGE DIAGNOSTIC
OUTPUT SHORT CIRCUIT AND THERMAL
OVERLOAD PROTECTION
VERY LOW STANDBY CURRENT (DEVICE
DISABLED)
TWO INTERNAL OUTPUT VOLTAGE
SWITCHES WITH LOW DROPOUT FOR
AM/FM SWITCHING
DRIVER CIRCUIT FOR EXTERNAL HIGH
SIDE SWITCH WITH DROP MONITORING
ENABLE INPUT TO SWITCH ON THE DE-
VICE
ADDITIONAL 10V VERY LOW DROP REGU-
LATOR TO SUPPLY THE VARICAP
BLOCK DIAGRAM
SO20 (12+4+4)
ORDERING NUMBER: L4952D
DESCRIPTION
The L4952 is a monolithic voltage regulator in an
advanced BCD60II process with high efficient p-
channel transistor. This device is optimized for
Car Radio applications to obtain optimum per-
formance and supply system integration with high
flexibility and minimum peripheral components.
June 2000
1/8
1 page  
is High the device is switched on. The diagnostic
circuitry detect the low drop voltage.
In this case the DIAG output is going low and can
mute the power output stage to avoid noise on
the loudspeaker.The two internal switches can
switch the stabilized output voltage with P-MOS
Transistors to one of the outputs 2 and 3 with low
drop. This is useful to switch the AM and FM cir-
cuitry on or off.
To control it there are two digital inputs En2 and En3
one for each switch. EN2 is High active and EN3 is
Low active. It’s possible to drive the AM/FM switch
with one digital line (EN2 and EN3 together).
The driver for the external High side switch can
switch on and off the external pnp transistor. The
drop detection circuitry avoid the damage of the
external power pnp transistor.
To supply the varicaps and the PLL-opamp of the
car radio a second very low drop 10 V regulator is
available. This regulator in dropout has a typical
resistance of 50Ω.
Typical Characteristics (Note 4)
Figure 3: Stand by consumption versus
temperature
L4952
Function of the external High side switch
driver
Fig 2 shows the principle circuitry of the external
High side switch. Fig. 3 shows the switch on/off
phase of the external High side switch. At the
time t0 the microcontroller switches on (curve 1 =
output signal of the microcontroller).
The signal on the HSON pin of the L4952 is shown
on curve 2. At t1 the external Power pnp is
switched on. At t2 (VHSON = VSON2) the internal
comparator compares the drop of the external pnp.
In case of normal operation the drop is smaller than
VDth and no failure will be detected (curve 3).
In case of failure (that mean a higher drop than
VDth ) the external power pnp will be switched off
(curve 4). If an error is detected it will be stored in
the internal error flip-flop. The external pnp can
only be switched on again after having turned
HSON off (VHSON < VSON1) again.
Figure 4: Logic input currents versus input
voltage
Supply voltage rejection (C = 10µF, ESR = 4.7Ω,
Load at OUT4 = 10kΩ)
Figure 5: Supply rejection versus Frequency.
OUT2 propagation delay (Load = 100Ω)
Figure 6: OUT2 propagation delay (Load = 100Ω)
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L4952.PDF ] | |
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