STMICROELECTRONICS L6375STR

L6375S
0.5A high-side driver industrial intelligent power switch
Preliminary Data
Features
■
0.5A output current
■
8V to 35V supply voltage range
■
Internal current limiting
■
Thermal shutdown
■
Open ground protection
■
Internal negative voltage clamping 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
■
Immunity against burst transient
(IEC 61000-4-4)
■
Description
ESD protection (human body model ±2kV)
Table 1.
SO-8
The L6375S is a monolithic Intelligent Power
Switch in Multipower BCD Technology, for driving
inductive or resistive loads with controlled output
voltage slew rate and short circuit protection.
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.
Device summary
Order codes
Op. temp. range, °C
Package
Packaging
L6375S
-25 to +125
SO-8
Tube
L6375STR
-25 to +125
SO-8
Tape & Reel
October 2007
Rev 5
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/17
www.st.com
17
Contents
L6375S
Contents
1
Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4
Switching waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5
Input section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.6
Over temperature protection (OVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.7
Under voltage protection (UV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.8
Over current operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.9
Diagnostic logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.10
Demagnetization of inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.11
Diagnostic truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
L6375S
1
Block diagram and pin description
Block diagram and pin description
Figure 1.
Block diagram
3/17
Block diagram and pin description
Figure 2.
L6375S
Pin connection (top view)
SO-8
1.1
Pin description
Table 2.
4/17
Pin description
Pin N°
Pin name
1
GND
Ground
2
OUT
High Side output with built-in current limitation
3
VS
Supply Voltage Input, the value of the supply voltage is monitored to
detect under voltage condition
4
Output status
This current source output is capable of driving a LED to signal the
status of the output pin. The pin is active (source current) when the
output pin is considered high (See Figure 4)
5
DIAG1
DIAGNOSTIC 1 output. This open drain reports the IC working
conditions. (See Diagnostic truth Table 6)
6
DIAG2
DIAGNOSTIC 2 output. This open drain reports the IC working
conditions. (See Diagnostic truth Table 6)
7
IN+
8
ON-DELAY
Function
Comparator inverting input
Programmable ON time interval duration during short circuit operation
L6375S
Electrical specifications
2
Electrical specifications
2.1
Absolute maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Value
Unit
Vs
Supply voltage (tw < 10 ms)
50
V
Vs
Supply voltage (DC)
40
V
internally limited
V
Vs -Vout
Supply to output differential voltage
Vod
Externally forced voltage
-0.3 to 7
V
Iod
Externally forced current
±1
mA
Iout
Output current (see also Isc)
internally limited
A
Vout
Output voltage
internally limited
V
PTOT
Power dissipation
internally limited
W
Vdiag
External voltage
-0.3 to 40
V
Idiag
Externally forced current
-10 to 10
mA
Ii
Input current
20
mA
Vi
Input voltage
-10 to Vs +0.3
V
Top
Ambient temperature, operating range
-25 to 85
°C
TJ
Junction temperature, operating range
(see Overtemperature Protection)
-25 to 125
°C
Storage temperature
-55 to 150
°C
200
mJ
Value
Unit
TSTG
EI
2.2
Parameter
Energy inductive load TJ = 85°C
Thermal data
Table 4.
Symbol
Thermal data
Parameter
RthJA
Thermal resistance junction-ambient
Max
100(1)
°C/W
RthJP
Thermal resistance junction-pins
Max
15
°C/W
1. When mounted on a standard single-sided FR-4 board with 0.5 cm2 of Cu (at least 35µm) thick connected
to all VCC pins. Horizontal mounting and no artificial air flow.
5/17
Electrical specifications
2.3
Electrical characteristics
Table 5.
Symbol
Vsmin
Electrical characteristics
(VS = 24V; TJ = –25 to +125°C, unless otherwise specified)
Parameter
Supply voltage for valid
diagnostic
Test condition
Idiag = > 0.5mA;
Vdiag = 1.5V;
Min
Typ
4
Max
Unit
35
V
Vs
Operative supply voltage
8
24
35
V
Vsth1
Undervoltage threshold 1
7
7.5
8
V
Vsth2
Undervoltage threshold 2
6.5
7
7.5
V
Vshys
Under voltage hysteresis
300
500
700
mV
Iq
Quiescent current
Output open
800
µA
Iqo
Quiescent current
Output ON
1.6
mA
Vith
Input threshold voltage
0.8
Viths
Input threshold hysteresis
Vil
Input low level voltage
Vih
Input high level voltage
Vih
Iib
2
V
50
400
mV
-7
0.8
V
Vs < 18V
2
Vs - 3
V
Input high level voltage
Vs > 18V
2
15
V
Input bias current
Vi = -7 to 15V
-250
250
mA
Delay capacitor charging
current
ON DELAY pin shorted to
Ground
2.5
Output voltage drop
Iout = 500mA TJ = 25°C
TJ = 125°C
Iout =625mA TJ = 25°C
TJ= 125°C
200
320
250
400
Iolk
Output leakage current
Vi = LOW; Vout=0
Vol
Output low state voltage
Vi = HIGH; pin floating
Vcl
Internal voltage clamp
(Vs-Vout)
Io = 200mA
single pulsed = 300ms
Isc
Short circuit output current
Iold
Open load detection current
Idch
Vdon
1.3
mA
280
440
350
550
mV
mV
mV
mV
100
µA
0.8
1.5
V
48
53
58
V
Vs = 8 to 35V; Rl = 2Ω;
0.75
1.1
1.5
A
Vi = Vih; TA= 0 to +85°C
1
3
6
mA
Voth1
Output status threshold 1
voltage
4.5
5
5.5
V
Voth2
Output status threshold 2
voltage
4
4.5
5
V
Vohys
Output status threshold
hysteresis
300
500
700
mV
4
mA
Iosd
6/17
L6375S
Output status source current
Vout > Voth1 ; Vos = 2.5V
2
L6375S
Electrical specifications
Table 5.
Symbol
Electrical characteristics (continued)
(VS = 24V; TJ = –25 to +125°C, unless otherwise specified)
Parameter
Test condition
Min Typ Max
Unit
1.5
3
V
25
mA
Vosd
Active output status driver drop VS – VOS ; IOS = 2mA
TA = 0 to +85°C
voltage
Ioslk
Output status driver leakage
current
Vout < Voth2 ; Vos = 0V
VS = 18 to 35V
Vdgl
Diagnostic drop voltage
D1 / D2 = L ; Idiag = 0.5mA
D1 / D2 = L ; Idiag = 3mA
Idglk
Diagnostic leakage current
D1 / D2 = H ; 0 < Vdg < Vs
VS = 15.6 to 35V
Tmax
Over temperature upper
threshold
150
°C
Thys
Over temperature hysteresis
20
°C
40
250
mV
mV
5
µA
AC operation (pin numbering referred to Minidip package)
tr -tr
td
dV/dt
Rise or fall time
Vs = 24V; Rl =70Ω Rl to ground
20
µs
Delay time
Vs = 24V; Rl =70Ω Rl to ground
5
µs
Slew rate (rise and fall edge)
tON
On time during short circuit
condition
tOFF
fmax
7
1
15
V/µs
1.28
µs/pF
Off time during short circuit
condition
64
tON
Maximum operating frequency
25
KHz
50pF < CDON< 2nF
Source drain NDMOS diode
Vf
Forward on voltage
@ Ifsd = 625mA
IfD
Forward peak voltage
t = 10ms; d = 20%
trr
Reverse recovery time
If= 625mA di/dt = 25A/ms
tfr
Forward recovery time
1
1.5
V
2
A
200
ns
50
ns
7/17
Electrical specifications
2.4
Switching waveform
Figure 3.
2.5
L6375S
Switching waveform
Input section
An Single ended Input TTL/CMOS compatible with wide voltage range and high noise
immunity (thanks to a built in hysteresis) is available.
2.6
Over temperature protection (OVT)
An on-chip Over Temperature Protection provides an excellent protection of the device in
extreme conditions. Whenever the temperature - measured on a central portion of the chip
exceeds Tmax = 150oC (typical value) the device is shut off, and the DIAG2 output goes
LOW. Normal operation is resumed as the chip temperature (normally after few seconds)
falls below Tmax - Thys = 130oC (typical value). The hysteresis avoid that is an intermittent
behavior take place.
2.7
Under voltage protection (UV)
The supply voltage is expected to range from 8 to 35V. In this range the device operates
correctly. To avoid any misfunctioning the supply voltage is continuously monitored to
provide an under voltage protection. As Vs falls below Vsth-Vshys (typically 7.5 V, see fig.1)
the output power MOS is switched off and DIAG1 and DIAG2 (see Diagnostic truth table).
Normal operation is resumed as soon as Vs exceeds Vsth. The hysteretic behavior prevents
intermittent operation at low supply voltage.
8/17
L6375S
2.8
Electrical specifications
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 (1.1A 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 µsec/pF
for
50pF< Cdon < 2nF
After the Ton interval has expired the output power MOS is switched off for the Toff time
interval with:
Toff = 64 ·Ton.
When also the Toff interval has expired, the out-put power MOS is switched ON. At this point
in time two conditions may occur
a)
The overloads still present, and then the output power MOS is again driven in
linear mode (limiting the output current to ISC) for another TON, starting a new
cycle, or
b)
the over load the overload condition is removed, and the output power MOS is no
longer driven in linear mode. All these occurrences are presented on the DIAG2
pin (see fig 2).
We call this unique feature Non Dissipative Short Circuit Protection and it ensures a very
safe operation even in permanent overload conditions. Note that choosing the most
appropriate value for the Ton interval (i.e. the value of the Cdon capacitor) a delay (the Ton
itself) will prevent that a misleading Short Circuit information is presented on the DIAG2
output, when driving capacitive loads (that acts like short circuit in the very beginning)
or Incandescent Lamp (a cold filament has a very low resistive value). The Non Dissipative
Short Circuit Protection can be disabled (keeping Ton = 0 but with the output current still
limited to Isc, and Diagnostic disabled) simply shorting to ground the ON DELAY pin.
Figure 4.
Non dissipative short circuit protection operation
9/17
Electrical specifications
2.9
L6375S
Diagnostic logic
The operating conditions of the device are permanently monitored and the following
occurrences are signalled via the DIAG1/DIAG2 open-drain output pins see diagnostic Truth
Table.
2.10
●
Short Circuit versus ground.
●
Short Circuit versus VS.
●
Under Voltage (UV)
●
Over Temperature (OVT)
●
Open Load, if the output current is less than 3mA (typical value).
Demagnetization of inductive loads
An internal zener diode, limiting the voltage across the Power MOS to between 50 and 60V
(Vcl), provides safe and fast demagnetization of inductive loads without external clamping
devices. The maximum energy that can be absorbed from an inductive load is specified as
200mJ (at TJ = 85°C)
2.11
Diagnostic truth table
Table 6.
Diagnostic truth table
Diagnostic conditions
Input
Output
Diag1
Diag2
Normal Operation
L
H
L
H
H
H
H
H
Open Load Condition (Io< Iold)
L
H
L
H
H
L
H
H
Short to VS
L
H
H
H
L
L
H
H
Short Circuit to Ground (IO = ISC) (1)
(pin ON-DELAY grounded)
H
L
X
L
H
H
H
H
Output DMOS Open
L
H
L
L
H
L
H
H
Overtemperature
L
H
L
L
H
H
L
L
Supply Undervoltage (VS< Vsth2)
L
H
L
L
L
L
L
L
1. A cold lamp filament, or a capacitive load may activate the current limiting circuit of the IPS, when the IPS
is initially turned on.
10/17
L6375S
3
Application circuits
Application circuits
Figure 5.
Inductive load equivalent circuit
Figure 6.
External demagnetisation circuit (versus ground)
11/17
Application circuits
L6375S
Figure 7.
External demagnetisation circuit (versus vs)
Figure 8.
Application schematic
(IEC 61000-4-5)
(IEC 61000-4-6)
ON-DELAY
12/17
L6375S
4
Package mechanical data
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect . The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com
13/17
Package mechanical data
Table 7.
L6375S
SO-8 mechanical data
mm
inch
Dim.
Min
Typ
A
a1
Max
Typ
1.75
0.1
0.25
a2
Max
0.068
0.003
0.009
1.65
0.064
a3
0.65
0.85
0.025
0.033
b
0.35
0.48
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.25
0.5
0.010
0.019
c1
45 ( typ. )
D
4.8
5.0
0.188
0.196
E
5.8
6.2
0.228
0.244
e
1.27
0.050
e3
3.81
0.150
F
3.8
4.0
0.14
0.157
L
0.4
1.27
0.015
0.050
M
0.6
S
Figure 9.
14/17
Min
0.023
8º (max.)
Package dimensions
L6375S
Package mechanical data
Figure 10. SO-8 Tape and reel information
15/17
Revision history
5
L6375S
Revision history
Table 8.
16/17
Revision history
Date
Revision
Changes
18-Sep-2006
1
Initial release
19-Jun-2007
2
Truth table updated
05-Jul-2007
3
Typo in Table 5 on page 6
16-Jul-2007
4
Pin out updated
15-Oct-2007
5
Updated Table 4 on page 5
L6375S
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17/17