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5140 PROTECTED POWERHALL(R) SENSOR: LAMP/SOLENOID DRIVER
5140
PROTECTED POWERHALL(R) SENSOR -- LAMP/SOLENOID DRIVER
The UGQ5140K unipolar Hall effect switch is a monolithic integrated circuit designed for magnetic actuation of low-power incandescent lamps or inductive loads such as relays or solenoids. Included on chip is a Darlington power output that is capable of continuously sinking in excess of 300 mA. Internal protection circuitry limits surge (lamp turn-ON) or fault currents to approximately 900 mA. A sensitive magnetic threshold allows the device to be used in conjunction with inexpensive magnets or in applications that require relatively large operating distances. Each sensor/driver includes a magnetic sensing Hall voltage generator, operational amplifier, Schmitt trigger, voltage regulator, and an open-collector, high-gain Darlington power output stage. The regulator allows use of the device with supply voltages of 4.5 V to 28 V. On-chip compensation circuitry stabilizes switch-point performance over temperature. The magnetic operation of this device is similar to that of the A3141E-- Hall-effect switch. The sensitive magnetic switch point coupled with the power output, current limiting, and thermal limiting circuitry allow the UGQ5140K to magnetically actuate various loads without requiring any external components. The UGQ5140K is rated for operation over an extended temperature range of -40C to +85C. It is supplied in a four-pin mini-SIP plastic package, 0.200" (5.08 mm) wide, 0.130" (3.30 mm) high, and 0.060" (1.54 mm) thick.
Data Sheet 27695*
X
V
CC
1
2
3
4
OUTPUT
Dwg. PH-001
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25C
Supply Voltage, VCC . . . . . . . . . . . . . . 28 V Reverse Battery Voltage, VRCC . . . . . -45 V Output OFF Voltage, VOUT . . . . . . . . . . 45 V Over-Current Protected Output Voltage, VOUT . . . . . . . . . . . . . . . . . . . . . . . . 25 V Output ON Current, IOUT . . . . . . . 900 mA* Magnetic Flux Density, B . . . . . . Unlimited Package Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . See Graph Operating Temperature Range, TA . . . . . . . . . . . . . . . . . -40C to +85C Storage Temperature Range, TS . . . . . . . . . . . . . . . . -65C to +150C
* Output is current limited at approximately 900 mA and junction temperature limited if current in excess of 900 mA is attempted. See Circuit Description and Applications for further information.
GROUND
SUPPLY
DIODE
FEATURES
s Magnetically Actuated Power Switch s Temperature-Compensated Switch Points s High Current-Sink Capability 300 mA Continuous 900 mA Peak Current Limit s Output Short-Circuit Protection s Low Quiescent Standby Current s Linear Thermal Limiting s Automotive Temperature Range -40C to +85C, Operating s Internal Inductive Flyback/Clamp Diode Protection s Reverse Battery Protection s Low-Profile 4-Pin Mini-SIP
Always order by complete part number: UGQ5140K .
5140 PROTECTED POWERHALL(R) SENSOR: LAMP/SOLENOID DRIVER
1
VCC REV. BATTERY PROTECTION
3
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
FUNCTIONAL BLOCK DIAGRAM
1.0
0.8
REG.
DIODE
0.6
X
2
OUTPUT
THERMAL LIMIT
CURRENT LIMIT
0.4
FREE AIR, R JA = 177C/W
0.2
<<1
4
GROUND
Dwg. FH-001
0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-001
ELECTRICAL CHARACTERISTICS at TA = -40C to +85C, VCC = 4.5 V to 24 V (unless otherwise noted).
Characteristic Supply Voltage Range Output Leakage Current Output Sustaining Voltage Output Saturation Voltage Over-Current Limit Output Rise Time Output Fall Time Supply Current Diode Forward Voltage Diode Leakage Current Thermal Limit Symbol VCC IOUT VOUT(SUS) VOUT(SAT) ILIMIT tr tf ICC VF IR TLIMIT Test Conditions Operating VOUT = 24 V IOUT = 100 mA IOUT = 300 mA, V CC = 24 V VCC = VOUT = 12 V, B 500 G VCC = 12 V, VBB = 18 V, RL = 1.1 k, CL = 20 pF Output OFF IF = 300 mA VR = 35 V VCC = VOUT = 12 V, B 500 G, IOUT = 10 mA
Typical Data is at TA = +25C and is for design information only.
Min. 4.5 -- 35 -- -- -- -- -- -- --
Limits Typ. Max. 12 <1.0 -- 0.84 900 0.04 0.04 5.5 1.1 <1.0 24 10 -- 1.2 -- 2.0 2.0 10 1.5 50
Units V A V V mA s s mA V A C
--
165
--
MAGNETIC CHARACTERISTICS at VCC = 4.5 V to 24 V.
T A = +25C Characteristic Magnetic Operate Point Magnetic Release point Hysteresis Symbol BOP BRP Bhys Min. 70 50 20 Typ. 155 100 55 Max. 200 180 -- TA = -40C to +85C Min. 45 25 20 Typ. -- -- -- Max. 240 220 -- Units G G G
115 Northeast Cutoff, Box 15036 W Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1991, 1995 Allegro MicroSystems, Inc.
5140 PROTECTED POWERHALL(R) SENSOR: LAMP/SOLENOID DRIVER
TYPICAL OPERATING CHARACTERISTICS
1000
1.0
I OUT= 300 mA
SATURATION VOLTAGE IN VOLTS
-20 25 85 55 AMBIENT TEMPERATURE IN C 0 105 125
950
PEAK CURRENT LIMIT IN mA
0.9
900
0.8
850
800
0.7
750 -40
0.6 -40
-20
0
25
55
85
Dwg. GH-002A
AMBIENT TEMPERATURE IN C
Dwg. GH-004
180
I OUT 10 mA =
9.0
V CC = 12 V
160
8.0
OPERATE POINT
140
SUPPLY CURRENT IN mA
SWITCH POINT IN GAUSS
OUTPUT ON I OUT 10 mA =
7.0
120
6.0
OUTPUT OFF
100
RELEASE POINT
80 -40 -20 0 25 55 85
Dwg. GH-006A
5.0 -40
-20
0
25
55
85
Dwg. GH-003A
AMBIENT TEMPERATURE IN C
AMBIENT TEMPERATURE IN C
5140 PROTECTED POWERHALL(R) SENSOR: LAMP/SOLENOID DRIVER
TYPICAL TRANSFER CHARACTERISTICS at TA = +25C
15
CIRCUIT DESCRIPTION AND OPERATION
The UGQ5140K merges state-of-the-art Hall effect sensing and power driving technologies to allow precision non-contact actuation of incandescent lamps or inductive loads. It is rated for operation over an extended temperature range as typically required in automotive applications.
12
OUTPUT VOLTAGE IN VOLTS
VBB B OP
9.0
MAGNETIC OPERATION
6.0
I OUT 300 mA =
3.0
B RP
0 0 25 50 75 100
V OUT(SAT)
125
150
175
200
MAGNETIC FLUX DENSITY IN GAUSS
Dwg. GH-007
As shown in the Transfer Characteristics graph, the output of the device (pin 2) switches low when the magnetic field at the Hall sensor exceeds the operate point threshold (BOP). At this point, the output voltage is VOUT(SAT). When the magnetic field is reduced to below the release point threshold (BRP), the device output goes high. The difference in the magnetic operate and release points is called the hysteresis (BH) of the part. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise.
CURRENT AND THERMAL LIMITING
Output short circuits may be caused by faulty connectors, crimped wiring harnesses, or blown loads. In such cases, current and thermal limit circuitry will protect the output transistor against destruction. Current through the output transistor is sensed with a low-value on-chip aluminum resistor. The voltage drop across this resistor is fed back to control the base drive of the output stage. This feedback prevents the output transistor from exceeding its maximum current density rating by limiting the output current to approximately 900 mA. It may also cause the output voltage to increase (VOUT = VBB - [I LIMIT x RL]). In this mode, the device will dissipate an increased amount of power (PD = VOUT x ILIMIT) and the output transistor will be thermally stressed.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
5140 PROTECTED POWERHALL(R) SENSOR: LAMP/SOLENOID DRIVER
This stress, unless protected against (as in the UGQ5140K), will cause the device junction temperature to rise until it fails catastrophically. Thermal stress protection is provided in two manners; delta temperature protection, and junction temperature protection. Under worst-case conditions (see Figures 1 and 2), if the output is shorted to supply, the output transistor will heat up much faster than the rest of the integrated circuit. This condition could cause localized failure in the output transistor. To prevent damage, a delta temperature limiting scheme is used. If a large thermal gradient is sensed across the device, the output transistor base drive is reduced to lower the output current. This reduces the power (heat) generated by the output transistor. When thermal stresses cause the junction temperature to reach approximately +165C, a linear thermal limiting circuit is activated. This circuit linearly reduces the base drive of the output transistor to maintain a constant junction temperature of 165C. In this mode, the output current will be a function of the heat dissipating characteristics of the package and its environment. Linear thermal limiting eliminates the low-frequency thermal oscillation problems experienced by thermal shutdown (ON-OFF) schemes. The output characteristics are shown in Figures 1 and 2. Note the three distinct operating regions: peak limit, delta limit, and thermal limit. In practice the output voltage and current may exhibit some oscillations during peak current limiting due to output load characteristics. These oscillations are of very-short duration (typically 50 ms) and may be damped with an external capacitor between pins 2 and 4. When the fault condition that caused the output overload is corrected, the device returns to normal operating mode.
FIGURE 1
OUTPUT CURRENT UNDER SHORT-CIRCUIT CONDITIONS
NOT TO SCALE
PEAK CURRENT LIMIT
OUTPUT CURRENT
DELTA TEMP. LIMIT JUNCTION TEMP. LIMIT
TIME
Dwg. WH-002
FIGURE 2
OUTPUT VOLTAGE vs OUTPUT CURRENT
NOT TO SCALE TJ < 150C
OUTPUT VOLTAGE, V OUT
T
J
= 165C
DELTA TEMP. LIMIT
V OUT(SAT)
OUTPUT CURRENT, I OUT
Dwg. GP-013-1
CURRENT LIMIT
JUNCTION TEMP. LIMIT
5140 PROTECTED POWERHALL(R) SENSOR: LAMP/SOLENOID DRIVER
FIGURE 3 TYPICAL LAMP DRIVER APPLICATION
TYPICAL APPLICATIONS
INCANDESCENT LAMP DRIVER
X
V +12 V
CC
1
2
3
4
High incandescent lamp turn-ON currents (commonly called in-rush currents) can contribute to poor lamp reliability and destroy semiconductor lamp drivers. Warming resistors protect both driver and lamp but use significant power when the lamp is OFF while current-limiting resistors waste power when the lamp is ON. Lamps with steady-state current ratings to 300 mA can be driven by the UGQ5140K (Figure 3) without the need for warming or current limiting resistors. In applications using several sensor/drivers to control multiple lamps, the internal clamp diodes may be connected together to an appropriate current-limiting resistor and simple "lamp test" switch. As shown in Figure 4, when an incandescent lamp is initially turned ON, the cold filament is at minimum resistance and will normally allow a 10x to12x peak in-rush current. As the lamp warms up, the filament resistance increases to its rated value and the lamp current is reduced to its steady-state rating. When switching a lamp with the UGQ5140K, the internal current-limiting circuitry limits the peak current to approximately 900 mA. The device will stay in the current limit and delta temperature limit modes until the lamp resistance increases to its rated steady-state value (Figure 4). A side-effect of this currentlimiting feature is that lamp turn-on times will increase. Typical lamp turn-on times are shown in Figure 5. INDUCTIVE LOAD DRIVER
OPTIONAL LAMP TEST (SEE TEXT)
Dwg. EH-001
FIGURE 4 LAMP CURRENT vs TIME
NORMAL LAMP IN-RUSH CURRENT
NOT TO SCALE
CURRENT LIMIT DELTA TEMP. LIMIT
Connecting the internal clamp diode (pin 3) to the positive supply allows relays or other inductive loads to be driven directly, as shown in Figure 6. The internal diode prevents damage to the output transistor by clamping the high-voltage spikes which occur when turning OFF an inductive load. An optional external Zener diode can be used to increase the flyback voltage, providing a much faster inductive load turn-OFF current decay, resulting in faster dropout (reduced relay contact arcing), and improved performance. The maximum Zener voltage, plus the load supply voltage, plus the clamp diode forward voltage should not exceed 35 volts.
TIME
Dwg WH-001
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
5140 PROTECTED POWERHALL(R) SENSOR: LAMP/SOLENOID DRIVER
FIGURE 5 LAMP TURN-ON TIME
150
V BB = 14 V
SENSOR LOCATION
APPROXIMATE LAMP TURN-ON TIME IN ms
125
#168 BULB 14 V, 350 mA
ACTIVE AREA DEPTH 0.015" 0.38 mm NOM
0.121" 3.07 mm
0.053" 1.34 mm
100
75
#194 BULB 14 V, 270 mA
A
BRANDED SURFACE 1 2 3 4
50
25 -40
-20
0
25
55
85
Dwg. GH-005A
Dwg. MH-001B
AMBIENT TEMPERATURE IN C
FIGURE 6 TYPICAL RELAY/SOLENOID DRIVER APPLICATION
VBB + VZ + VF
X
V BB + VF
+12 V
V CC
OUTPUT VOLTAGE
2 3 4
V BB
VOUT(SAT)
1
OUTPUT CURRENT
ZENER CLAMP DIODE CLAMP
Dwg. WP-001-1
OPTIONAL ZENER
Dwg. EH-002
5140 PROTECTED POWERHALL(R) SENSOR: LAMP/SOLENOID DRIVER
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only
0.208 0.203
5.28 5.16
45
0.063 0.059
45
1.60 1.50
0.138 0.133 45 0.085
MAX
3.51 3.38 45 2.16
MAX
1
2
3
4
0.033
1
2
3
4
0.84
0.600 0.560
0.015
15.24 14.23
0.38
SEE NOTE
SEE NOTE
0.016
0.050
BSC
Dwg. MH-009C in
0.41
1.27
BSC
Dwg. MH-009C mm
NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2. Exact body and lead configuration at vendor's option within limits shown. 3. Height does not include mold gate flash. 4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm). 5. Where no tolerance is specified, dimension is nominal.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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