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L6377D Datasheet(PDF) 6 Page - STMicroelectronics

No. de pieza L6377D
Descripción Electrónicos  0.5A HIGH-SIDE DRIVER INTELLIGENT POWER SWITCH
Download  11 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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INPUT SECTION
An
Input
and
Asynchronous RESET,
both
TTL/CMOS compatible with wide voltage range
and high noise immunity (thanks to a built in hys-
teresis) are available.
OVER TEMPERATURE PROTECTION (OVT)
An on-chip Over Temperature Protection providse
an excellent protection of the device in extreme
conditions. Whenever the temperature - meas-
ured on a central portion of the chip- exceeds
Tmax=150 C (typical value) the device is shut off,
and the DIAG output goes LOW.
Normal operation is resumed as the chip tem-
perature (normally after few seconds) falls below
Tmax-Thys= 130 C (typical value). The hysteresis
avoid thats an intermittent behaviour take place.
UNDER VOLTAGE PROTECTION (UV)
The supply voltage is expected to range from 8 to
35 V. In this range the device operates correctly.
Below 8 V the overall system has to be consid-
ered not reliable. To avoid any misfunctioning the
supply voltage is continuously monitored to pro-
vide an under voltage protection. As Vs falls be-
low Vsth-Vshys (typically 7.5 V, see
fig.1) the
output power MOS is switched off and DIAG out-
put goes LOW. Normal operation is resumed as
soon as Vs exceeds Vsth. The hysteretic behav-
iour prevents intermittent operation at low supply
voltage.
OVER CURRENT OPERATION
In order to implement a short circuit protection the
output power MOS is driven in linear mode to limit
the output current to the Isc value. This Isc limit is
externally settable by means of an external 1/4 W
resistor connected from Rsc pin and GND. The
value of the resistor must be chosen according to
the following formula:
Isc (A) = 5/Rsc (kohm)
with
5 < Rsc < 30 (kohm)
For
Rsc < 5 (kohm)
Isc is limited to Isc=1.1 A (typical value).
This condition (current limited to the Isc value)
lasts for a Ton time interval, that can be set by
means of a capacitor (Cdon) connected to the ON
DELAY pin according to the following formula:
Ton = 1.28 msec/pF
for
50pF<Cdon< 2nF
After the Ton interval has expired the output
power MOS is switched off for the Toff time inter-
val with:
Toff = 64*Ton.
OUTPUT
CURRENT
tON
tON
tOFF
tOFF
Time
t<tON
DIAG
(active low)
Time
Short Circuit
Short Circuit
Isc
Iout
D94IN105
Figure 3: Short Circuit Operation Waveforms
L6377
6/11


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