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L6375
0.5A INDUSTRIAL INTELLIGENT POWER SWITCH
PRELIMINARY DATA
s s s
0.5A OUTPUT CURRENT 8V TO 35V SUPPLY VOLTAGE RANGE NON DISSIPATIVE SHORT CIRCUIT PROTECTION THERMAL SHUTDOWN OPEN GROUND PROTECTION NEGATIVE VOLTAGE CLAMPING FOR FAST DEMAGNETIZATION UNDERVOLTAGE LOCKOUT WITH HYSTERESIS OPEN LOAD DETECTION TWO DIAGNOSTIC OUTPUTS OUTPUT STATUS LED DRIVER IMMUNITY AGAINST BURST TRANSIENT (IEC 801-4), see application schematic. ESD PROTECTION (HUMAN BODY MODEL 2KV)
MULTIPOWER BCD TECHNOLOGY
s s s
SO20
MINIDIP
s
ORDERING NUMBERS: L6375D L6375
s s s s
DESCRIPTION
The L6375 is a monolithic fully protected, full diagnostic 0.5A Intelligent Power Switch. it is designed to drive any kind of R-L-C load with controlled output voltage slew rate and non dissipative 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.
s
BLOCK DIAGRAM
VS UNDER VOLTAGE INPUT CHARGE PUMP
IN+ IN-
+ DRIVER
1.4V OUT NON DISSIPATIVE SHORT CIRCUIT CURRENT LIMITATION OPEN LOAD DETECTION OUTSTATUS DIAG1 DIAGNOSTIC THERMAL PROTECTION DIAG2 3mA
Con
OSC
OUTPUT STATUS
D95IN208B
February 2000
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change with out notice.
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L6375
PIN FUNCTION (Pin numbering referred to Minidip package)
N 1 2 3 4 5 6 7 8 Pin GND OUT Vs Ground High side output. Controlled output with current limitation Supply voltage input. Range with under voltage monitoring Description
OUTPUT STATUS Led driver to signal the status of the output pin. The pin is active ( sources current ) when the output is considered high. (See fig. 1) DIAG1 DIAG2 IN+ ON DELAY Diagnostic 1 output. This open drain reports the IC working conditions. (See Diagnostic truth table) Diagnostic 2 output. This open drain reports the IC working conditions. (See Diagnostic truth table) Comparator non inverting input Delay setting for overcurrent diagnostic
PIN CONNECTION (Top view)
GND OUTPUT VS OUTPUT STATUS
1 2 3 4
8
ON DELAY INPUT + DIAG1 DIAG2
MINIDIP
7 6 5
N.C. GND N.C. OUTPUT N.C. VS N.C. N.C. N.C. OUTPUT STATUS
1 2 3 4 5 6 7 8 9 10
20 19 18 17
N.C. ON DELAY N.C. INPUT+ N.C. DIAG1 DIAG2 N.C. N.C. N.C.
SO20
16 15 14 13 12 11
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L6375
ABSOLUTE MAXIMUM RATINGS (Pin numbering referred to Minidip package)
Symbol Vs Vs Pin 3 3 3 vs 2 5 5 2 2 Parameter Supply Voltage (tw < 10 ms) Supply Voltage (DC) Supply to Output Differential voltage Externally Forced Voltage Externally Forced Current Output Current (see also Isc) Output Voltage Power Dissipation 5.6 5.6 7 7 External voltage Externally forced current Input Current Input Voltage Ambient temperature, operating range Junction temperature, operating range (see Overtemperature Protection) Storage temperature Energy Induct. Load TJ = 85C Value 50 40 internally limited -0.3 to 7 1 internally limited internally limited internally limited -0.3 to 40 -10 to 10 20 -10 to Vs +0.3 -25 to 85 -25 to 125 -55 to 150 200 V mA mA V C C C mJ V V mA Unit V V
Vs -Vout
Vod Iod Iout Vout Ptot Vdiag Idiag Ii
Vi Top Tj
Tstg
EI
THERMAL DATA
Symbol R th j-case Rth j-amb Parameter Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient Max. Max. 100 90 Minidip SO20 Unit C/W C/W
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L6375
ELECTRICAL CHARACTERISTCS (VS = 24V; Tj = -25 to +125C, unless otherwise specified; pin numbering referred to Minidip package)
Symbol Pin 3 3 3 3 3 3 3 7 7 7 7 7 7 5 Parameter Supply Voltage for Valid Diagnostic Operative Supply Voltage Undervoltage Threshold 1 Undervoltage Threshold 2 Under Voltage Hysteresis Quiescent Current Quiescent Current Input Threshold Voltage Input Threshold Hysteresis Input Low Level Voltage Input High Level Voltage Input High Level Voltage Input Bias Current Delay Capacitor Charging Current Output Voltage Drop Vs< 18V Vs> 18V Vi = -7 to 15V ON DELAY pin shorted to Ground Output Open Output On 0.8 50 -7 2 2 -250 2.5 200 320 250 400 280 440 350 550 100 0.8 48 53 1.5 58 (See fig. 2) (See fig. 2) Test Condition Min. 4 8 7 6.5 300 24 7.5 7 500 800 1.6 1.3 2 400 0.8 Typ. Max. 35 35 8 7.5 700 Unit V V V V mV A mA V mV V V V A A mV mV mV mV A V V
Vsmin Vs Vsth1 Vsth2 Vshys Iq Iqo Vith
Viths
Idiag = >0.5mA;Vdiag = 1.5V;
Vil Vih Vih Iib Idch Vdon
Vs -3
15 250
Iout = 500mA Tj = 25C
Tj = 125C Iout = 625mA Tj = 25C Tj = 125C
Iolk Vol Vcl Isc Iold Voth1 Voth2 Vohys Iosd
2 2 2
Output Leakage Current Output Low State Voltage
Vi = LOW; Vout=0 Vi = HIGH; pin floating
Internal Voltage Clamp (Vs-Vout) Io = 200mA single pulsed =300s Short Circuit Output Current Open Load Detection Current Output Status Threshold 1 Voltage Output Status Threshold 2 Voltage Output Status Threshold Hysteresis Output Status Source Current Vs = 8 to 35V; Rl = 2; Vi = Vih; Tamb = 0 to +85C (See fig. 1) (See fig. 1) (See fig. 1)
2 2 5.6 5.6 5.6 5.6
0.75 1 4.5 4 300
1.1 3 5 4.5 500
1.5 6 5.5 5 700
A mA V V mV
Vout > Voth1 ; Vos = 2.5V
2
4
mA
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L6375
ELECTRICAL CHARACTERISTCS (Continued)
Symbol Pin 5.6 Parameter Active Output Status Driver Drop Voltage Output Status Driver Leakage Current Diagnostic Drop Voltage Test Condition Vs - Vos ; Ios = 2mA Tamb = 0 to +85C Min. Typ. 1.5 Max. 3 Unit V A
Vosd Ioslk Vdgl Idglk Tmax Thys
5.6
Vout < Voth2 ; Vos = 0V
VS = 18 to 35V D1 / D2 = L ; Idiag = 0.5mA D1 / D2 = L ; Idiag = 3mA D1 / D2 = H ; 0 < Vdg < Vs VS = 15.6 to 35V 150 20 40 250
25
5.6
mV mV 5 A C C
5.6
Diagnostic Leakage Current
Over Temperature Upper Threshold Over Temperature Hysteresis
AC OPERATION (pin numbering referred to Minidip package)
tr -tf td
dV/dt tON tOFF
2 2 2 8 8
Rise or Fall Time Delay Time Slew Rate (Rise and Fall Edge) On time during Short Circuit Condition Off time during Short Circuit Condition Maximum Operating Frequency
Vs = 24V; R l =70 Rl to ground Vs = 24V; Rl =70 R l to ground 50pF < CDON < 2nF 7
20 5 1 128 64 25 15
s s V/s s/pF s/pF KHz
fmax
SOURCE DRAIN NDMOS DIODE Vf IfD trr tfr Forward On Voltage Forward Peak Voltage Reverse Recovery Time Forward Recovery Time @ Ifsd = 625mA t = 10ms; d = 20% If = 625mA di/dt = 25A/s 200 50 1 1.5 2 V A ns ns
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L6375
Figure 1. Switching Waveforms
Vin
50%
50%
td Vout 90% 50% 10% tr
td
t
90% 50% 10% tf
D94IN127A
t
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.
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=150 C (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= 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. 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 behaviour 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 (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 msec/pF
for 50pFL6375
ditions may occur A) the overload is 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 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 the ON DELAY pin.
Figure 2. Non Dissipative Short Circuit Protection Operation
OUTPUT CURRENT Isc Iout
ttON
tOFF
tON
tOFF
Time
Short Circuit
D94IN105
Time
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. - 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 = 85C)
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L6375
DIAGNOSTIC TRUTH TABLE
Diagnostic Conditions Normal Operation Open Load Condition (Io < Iold) Short to V S Short Circuit to Ground (IO = ISC) (pin ON-DELAY grounded) Output DMOS Open Overtemperature Sumplay Undervoltage (VS < Vsth2) Input L H L H L H H L H L H L H Output L H L H H H H L L L L L L L DIAG1 H H H L L L H H H L H H L L DIAG2 H H H H H H H H H H L L L L
Figure 3. Inductive Load Equivalent Circuit
+VS
IS 50V VS OUTPUT
IO RL
D95IN215
L
Figure 4. External Demagnetisation Circuit (versus ground)
VS RS CURRENT LIMIT DRIVER OUT UV SHORT CIRCUIT CONTROL
OVC
VZ
VZ < Vcl (min) - VS (max)
D94IN112
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L6375
Figure 5. External Demagnetisation Circuit (versus V ) S
VS RS CURRENT LIMIT DRIVER OUT UV SHORT CIRCUIT CONTROL
OVC
VS VZ
VS (max) < VZ < Vcl (min)
D94IN111A
Figure 6. Application Schematic
Transil, ST1,5KExx (IEC801-5) VS UNDER VOLTAGE INPUT CHARGE PUMP 2.2F, electrolytic
IN+
+ DRIVER OUT NON DISSIPATIVE SHORT CIRCUIT CURRENT LIMITATION OPEN LOAD DETECTION OUTSTATUS DIAG1 DIAGNOSTIC 10nF, ceramic (IEC801-4, IEC801-4)
1.4V
Con
OSC
THERMAL PROTECTION DIAG2 3mA
OUTPUT STATUS
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L6375
DIM. MIN. A A1 B C D E e H h L K 10 0.25 0.4 2.35 0.1 0.33 0.23 12.6 7.4
mm TYP. MAX. 2.65 0.3 0.51 0.32 13 7.6 1.27 10.65 0.75 1.27 0.394 0.010 0.016 MIN. 0.093 0.004 0.013 0.009 0.496 0.291
inch TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0.050 0.419 0.030 0.050
OUTLINE AND MECHANICAL DATA
SO20
0 (min.)8 (max.)
L
h x 45
A B e K H D A1 C
20
11 E
1
1 0
SO20MEC
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L6375
DIM. MIN. A a1 B b b1 D E e e3 e4 F I L Z 3.18 7.95 0.51 1.15 0.356 0.204
mm TYP. 3.32 0.020 1.65 0.55 0.304 10.92 9.75 2.54 7.62 7.62 6.6 5.08 3.81 1.52 0.125 0.313 0.045 0.014 0.008 MAX. MIN.
inch TYP. 0.131 MAX.
OUTLINE AND MECHANICAL DATA
0.065 0.022 0.012 0.430 0.384 0.100 0.300 0.300 0.260 0.200 0.150 0.060
Minidip
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L6375
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. N o license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (R) 1999 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http:/ /www.st.com
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