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PDF L6370Q Data sheet ( Hoja de datos )
| Número de pieza | L6370Q | |
| Descripción | 2.5 A single high-side smart power switch | |
| Fabricantes | STMicroelectronics | |
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L6370Q
2.5 A single high-side smart power switch
Features
Type
L6370Q
Vdemag
Vs-50 V
RDSon
0.1 Ω
Iout Vs
2.5 A 50 V
■ 2.5 A output current
■ 9.5 V to 35 V supply voltage range
■ Internal current limiting
■ Thermal shutdown
■ Open ground protection
■ Internal negative voltage clamping to VS - 50 V
for fast demagnetization
■ Differential inputs with large common mode
range and threshold hysteresis
■ Undervoltage lockout with hysteresis
■ Open load detection
■ Two diagnostic outputs
■ Output status LED driver
■ Non dissipative short circuit protection
■ Protection against and surge transient
(IEC61000-4-5)
■ Immunity against burst transient (IEC61000-4-
4)
■ ESD protection (human body model ±2kV)
Table 1. Device summary
QFN-48
(7 x 7 mm)
Applications
■ Programmable logic control
■ Industrial PC peripheral input/output
■ Numerical control machines
■ Drivers for all type of loads (resistive,
capacitive, inductive load)
Description
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The L6370 is a monolithic intelligent power switch
in Multipower-BCD Technology, for driving
inductive or resistive loads. An internal clamping
diode enables the fast demagnetization of
inductive loads. Diagnostic for CPU feedback and
extensive use of electrical protections make this
device extremely rugged and specially suitable for
industrial automation applications.
Part number
Package
Packaging
L6370Q
L6370QTR
VFQFPN 7x7x1 48L
Tube
Tape and reel
October 2011
Doc ID 022313 Rev 1
1/16
www.st.com
16
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
L6370Q
Block diagram and pin description
Table 2.
Pin N°
Pin description (continued)
Name
Description
DIAGNOSTIC 2 output. This open drain reports the IC working
29 DIAG2
conditions. (See diagnostic truth Table 6.)
30 NC Not connected
31 NC Not connected
32 NC Not connected
33 IN+ Comparator inverting input
34 IN- Comparator non inverting input
35 NC Not connected
36 NC Not connected
37 NC Not connected
This current source output is capable of driving a LED to signal the
38 OUTSTATUS status of the output pin. The pin is active (source current) when the
output pin is considered high
39 NC Not connected
40 NC Not connected
41
GND
Ground
42 NC Not connected
43 NC Not connected
44 NC Not connected
45
NC
Not connected
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46 NC Not connected
47 NC Not connected
48 NC Not connected
Doc ID 022313 Rev 1
5/16
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
L6370Q
Circuit description
3.4 Short circuit operation
In order to minimize the power dissipation when the output is shorted to grounded, an
innovative, non dissipative short circuit protection (patent pending) is implemented,
avoiding, thus the intervention of the thermal protection in most cases.
Whenever the output is shorted to ground, or, generally speaking, an overcurrent is sinked
by the load, the output devices is driven in linear mode, sourcing the Isc current (typically 3.2
A) for a time interval (ton) defined by means of the external CON capacitor connected
between the ONDELAY pin and GND. Whether the short circuit crease within the ton interval
the DIAG2 output status is not affected, acting as a programmable diagnostic delay.
This function allow the device to drive a capacitive load or a filament lamp (that exhibits a
very low resistance during the initial heading phase) without the intervention of the
diagnostic. If the short circuit lasts for the whole tON interval, the output DMOS is switched
OFF and the DIAG2 goes low, for a time interval tOFF lasting 64 times tON.
At the end of the tOFF interval if the short circuit condition is still present, the output DMOS is
turned ON (and the DIAG2 goes high - see Figure 7) for another tON interval and the
sequence starts again, or, whether not, the normal condition operation is resumed.
The tON interval can be set to lasts between 64 ms and 2.56 ms for a CON capacitor value
ranging between 50 pF and 2 nF to have:
tON (μs) = 1.28 CON (pF)
If the ON-DELAY pin is grounded the non dissipative short circuit protection is disabled, and
the Isc current is delivered until the overtemperature protection shuts the device off. The
behaviour of the DIAG2 output is, in this situation, showed in the Diagnostic Truth Table 7.
3.5
Overtemperatur protection (OVT)e
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If the chip temperature exceeds Qlim (measured in a central position in the chip) the chip
deactivates itself.
The following actions are taken:
all the output stage is switched off;
the signal DIAG2 is activated (active low).
Normal operation is resumed as soon as (typically after some seconds) the chip
temperature monitored goes back below Θlim-ΘH.
The different thresholds with hysteretic behavior assure that no intermittent conditions can
be generated.
3.6 Undervoltage protection (UV)
The supply voltage is expected to range from 9.5 V to 35 V, even if its reference value is
considered to be 24 V.
In this range the device operates correctly. Below 9.5 V the overall system has to be
considered not reliable.
Protection will thus shut off the output whenever the supply voltage falls below the mask
fixed by the Vsth1(9 V typ.) and Vsth2 (8.5 V typ.).
Doc ID 022313 Rev 1
11/16
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet L6370Q.PDF ] | |
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