5275
COMPLEMENTARY OUTPUT
POWERHALL
®
LATCH
5275
COMPLEMENTARY OUTPUT
POWER HALL
®
LATCH
Type UGN5275K latching Hall-effect sensors are bipolar integrated
circuits designed for electronic commutation of brushless dc motors.
They feature open-collector complementary power outputs that are
capable of sinking up to 300 mA continuously. Increased current
ratings, complementary outputs, and sensitive switching points that are
stable over temperature and time ideally suit these devices for mini-
mum-component brushless dc motor designs.
Each sensor IC includes a Hall-voltage generator, an operational
amplifier, a Schmitt trigger, a voltage regulator, and large-area dual
npn-output transistors. The regulator allows the IC to operate with
supply voltages ranging from 4.5 V to 14 V. On-chip compensation
circuitry stabilizes switch point performance over temperature. The
large bipolar junction output transistors are fed by a unique driver
stage, which minimizes power dissipation within the IC. The magnetic
operation of this device is similar to that of the UGN3275K complemen-
tary-output Hall-effect latch.
Output Q of the IC switches to the LOW state when the internal
Hall generator experiences a magnetic field that exceeds the rated
operate point. Output Q switches HIGH within one
µs
of the Output Q
change of state. When the device is exposed to a sufficient magnetic
field of opposite polarity, Output Q returns to the HIGH state, and
Output Q returns to the LOW state.
The UGN5275K is rated for operation over a temperature range of
-20°C to +85°C, and is supplied in an environmentally rugged, four-pin
miniature plastic SIP. Consult the factory for alternate packaging and
custom magnetic requirements.
Data Sheet
27632A
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25°C
Supply Voltage, V
CC
. . . . . . . . . . . . . . .
14 V
Magnetic Flux Density, B . . . . . .
Unlimited
Output OFF Voltage, V
CE
. . . . . . . . . . .
60 V
Output ON Current, I
C
Continuous . . . . . . . . . . . . . . . . .
0.5 A
Peak (Start Up) . . . . . . . . . . . . . .
0.9 A
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . . .
-20
°
C to +85
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . . .
-65
°
C to +150
°
C
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . . . . . . . .
750 mW
T
C
U Y
D L
O N
R O
P E
D C
E N
U E
IN ER
T F
N E
O R
C R
IS O
D F
—
V
CC
1
X
2
3
4
Dwg. PH-002
GROUND
OUTPUT
SUPPLY
OUTPUT
FEATURES
s
s
s
s
s
High Sink-Current Capability
Magnetic Sensing, Complementary-Output Latch
On-Chip Schmitt Trigger Provides Hysteresis
Temperature-Compensated Switch Points
Rugged, Low-Profile SIP
Always order by complete part number:
UGN5275K
.
5275
COMPLEMENTARY OUTPUT
POWERHALL
®
LATCH
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C, V
CC
= 4.5 V to 14 V
(unless otherwise noted).
Characteristic
Supply Voltage
Output Saturation Voltage
Output Leakage Current
Supply Current
Output Rise Time
Output Fall Time
Switch Time
Differential
Symbol
V
CC
V
CE(SAT)
I
CEX
l
CC
t
r
t
f
∆t
V
CC
= 14 V, I
C
= 300 mA
V
CE
= 14 V, V
CC
= 14 V
V
CC
= 14 V, Output Open
V
CC
= 14 V, R
L
= 45
Ω,
C
L
= 20 pF
V
CC
= 14 V, R
L
= 45
Ω,C
L
= 20 pF
V
CC
= 14 V, R
L
= 45
Ω,
C
L
= 20 pF
Test Conditions
Min.
4.5
—
—
—
—
—
—
Typ.
—
400
—
18
0.3
0.3
1.0
Max.
14
600
10
30
1.5
1.5
3.0
Units
V
mV
µA
mA
µs
µs
µs
MAGNETIC CHARACTERISTICS
T
A
= +25
°
C
Characteristic
Operate Point
Release Point
Hysteresis
Symbol
B
OP
B
RP
B
hys
Min.
25
-250
100
Max.
250
-25
—
T
A
= -20
°
C to +85
°
C
Min.
15
-250
100
Max.
250
-15
—
Units
G
G
G
NOTE: As used here, negative flux densities are defined as less than zero (algebraic convention).
TEST CIRCUIT
FUNCTIONAL BLOCK DIAGRAM
1
V
CC
2
OUTPUT
REG.
X
3
OUTPUT
GROUND
4
Dwg. FH-002
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1988, 1995, Allegro MicroSystems, Inc.
5275
COMPLEMENTARY OUTPUT
POWERHALL
®
LATCH
MOTOR COIL DRIVER
FIGURE 2
SWITCH POINTS VERSUS
TEMPERATURE
APPLICATIONS
The increased current sinking capability of the UGN5275K ideally
suits it for building small, inexpensive brushless dc motors using a
minimum number of external components. Figure 2 shows that the
only components required to commutate motor windings L1 and L2 are
the Hall effect IC, flyback diodes D1 and D2, and one decoupling
capacitor. The remaining components are optional for improving motor
performance. Care should be taken to ensure that the motor winding
impedances are high enough to guarantee that start-up surge currents
do not exceed the maximum rating of the Hall effect IC.
In the circuit shown, diodes D1 and D2 supply a flyback path for
the current of each winding to prevent reactive voltages from exceed-
ing the sustained voltage rating of the Hall-effect IC output transistors.
Zener diode Z1 enables the windings to switch more rapidly by allow-
ing the output voltage to rise above the source voltage, while simulta-
neously clamping the extreme reactive voltages.
The maximum output voltage level will be restricted to the follow-
ing: V
CC
- V
D3
+ V
Z
+ V
D1
(blocking diode D3 voltage drop). Blocking
diode D3 provides reverse input-polarity protection, and should be
used only if reverse battery voltage is a possibility. Capacitor C1
decouples the Hall-effect IC from any high dv/dt transients injected
onto the V
CC
rail to prevent regulator latch-up within the device. Zener
diode Z2 and resistor R1 are required for operation from a V
CC
exceed-
ing 14 V.
5275
COMPLEMENTARY OUTPUT
POWERHALL
®
LATCH
HYSTERESIS CHARACTERISTICS
SENSOR LOCATION
ACTIVE AREA DEPTH
0.015"
0.38 mm
NOM
0.112"
2.86 mm
GUIDE TO INSTALLATION
0.047"
1.19 mm
A
BRANDED
SURFACE
1
2
3
4
Dwg. MH-001-3A
Dwg. No. A-12,062
1. All Hall Effect integrated circuits are susceptible to mechanical
stress effects. Caution should be exercised to minimize the
application of stress to the leads or the epoxy package. Use of
epoxy glue is recommended. Other types may deform the epoxy
package.
2. To prevent permanent damage to the Hall cell, heat-sink the leads
during hand-soldering. Recommended maximum conditions for
wave soldering are shown in the graph above.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5275
COMPLEMENTARY OUTPUT
POWERHALL
®
LATCH
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.
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