UDN3625 and UDN3626: PowerHall Sensor IC/Drivers for Brushless DC Motors

Data Sheet
27690B
3625 AND
3626
POWERHALL® SENSOR IC/DRIVERS
FOR BRUSHLESS DC MOTORS
Requiring a minimum of external components, the UDN3625M
and UDN3626M are monolithic ICs that provide single-chip control
and direct drive solutions for many small, single-phase, unipolar
brushless dc motor applications. Integrated into the ICs are a highsensitivity Hall-effect element, control and commutating logic, a stable
voltage regulator, extensive self and system protective functions, and
two high-current saturated npn outputs. Both ICs include thermal
shutdown, output over-current limiting, and output transient protection/
flyback diodes. The UDN3625M is nominally for 12 V motor applications while the UDN3626M is better suited to 24 V motors.
T
C
U
Y
L
D
N
O
O
R
P E
C
D
E
N
E
U
N ER
I
T
F
N
E
O
R
C
S OR
I
D F
—
Output over-current limiting (relating to startup surge or a locked
rotor condition) and short-circuit protection are provided by an internal
current-sense resistor. The maximum (default) output load current is
typically 1.3 A for the UDN3625M or 600 mA for the UDN3626M,
but may be decreased by user selection of an external low-wattage
resistor.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC . . . . . . . . . . See Table
Output Current, IO . . . . . . . . . . . . See Table
PWM Current Control Voltage,
VADJ . . . . . . . . . . . . . See Applications
Magnetic Flux Density, B . . . . . . Unlimited
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . . -65°C to +150°C
VCC(MAX)
IO(CONT)
IO(PEAK)
UDN3625M
UDN3626M
14 V
1.0 A
1.6 A
26 V
0.45 A
0.75 A
Output current rating will be limited by
ambient temperature, supply voltage, and
duty cycle. Under any set of conditions, do
not exceed a junction temperature of
+150°C.
A separate low-level output provides tachometer capability for
motor speed control or sensing a locked rotor condition. With appropriate external logic, pulse-width modulated (PWM) speed control can
be accomplished at the output current adjust pin.
These sensor ICs/drivers are supplied in an 8-pin mini-DlP plastic
package with a copper leadframe for increased package power
handling capability.
FEATURES
■ 900 mA /12 V or 400 mA /24 V Operation
■ Speed-Control (PWM) Capability
■ Locked-Rotor Indication
■ Minimum External Components
■ Over-Current Protected
■ Thermal Protection
■ Enhanced Reliability
■ Reduced Cost
Always order by complete part number, e.g., UDN3625M .
See Maximum Ratings at left.
3625 AND 3626
POWERHALL®
SENSOR ICS/DRIVERS FOR
BRUSHLESS DC MOTORS
FUNCTIONAL BLOCK DIAGRAM
VS
SUPPLY
5
OUT B
4
TSD
REG.
6
OUTA
X
+V
8
7
TACH
OUT
GROUND
PWM/I O 1
ADJUST
RADJ
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
Dwg. FP-005-1
2.0
TRUTH TABLE
RθJC = 55°C/W
Mag. Field
1.5
> +BOP
> -BOP
Any
1.0
0.5
0
25
PWM/IOADJ
OUTA
OUTB
Open
Open
<0.3 V
Low
High
High
High
Low
High
FREE AIR, RθJA = 80°C/W
50
75
100
TEMPERATURE IN °C
125
150
Dwg. GP-009-1B
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1988, 1995, Allegro MicroSystems, Inc.
3625 AND 3626
POWERHALL®
SENSOR ICS/DRIVERS FOR
BRUSHLESS DC MOTORS
ELECTRICAL CHARACTERISTICS at TA = +25°C, RADJ = ∞, Over Operating Voltage Range
(unless otherwise noted).
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
6.5
12
14
V
VCC = VO = 24 V
—
—
100
µA
UDN3625M
Operating Voltage Range
VS
Output Leakage Current
IO
Output Breakdown Voltage
V(BR)CEX
VCC = 24 V, lO = 10 mA*
34
—
—
V
Output Saturation Voltage
VO(SAT)
IO = 450 mA, VS = 6.5 V
—
0.25
0.4
V
IO = 900 mA, VS = 12 V
—
0.5
0.8
V
RADJ = ∞, VO = 2 V
1.0
1.3
1.6
A
ICL = 10 mA, VCC = 0
11
12
13
V
ICL = 450 mA=, VCC = 0
13
14
15
V
Output Current Limit
IO MAX
Output Clamp Voltage
(Test Fig. 1)
VCL
Output Switching Time
tPLH
50% VADJ to VO = 3.0 V, lO = 450 mA
—
—
5.0
µs
Supply Current
(Test Fig. 2)
lCC
RADJ = ∞, VS = 14 V, One Output ON
—
30
38
mA
RADJ = 0 Ω, VS = 14 V, Outputs OFF
—
8.0
10
mA
‡
24
26
V
VCC = VO = 30 V
—
—
100
µA
UDN3626M
Operating Voltage Range
VS
Output Leakage Current
lO
Output Breakdown Voltage
V(BR)CEX
VCC = 30 V, lO = 10 mA*
50
—
—
V
Output Saturation Voltage
VO(SAT)
lO = 250 mA, VS = 6.5 V
—
0.15
0.3
V
lO = 400 mA, VS = 24 V
—
0.3
0.5
V
RADJ = ∞, VO = 2 V
450
600
750
mA
ICL = 10 mA, VCC = 0
17
18
20
V
ICL = 250 mA, VCC = 0
19
20
22
V
Output Current Limit
lOMAX
Output Clamp Voltage
(Test Fig. 1)
VCL
Output Switching Time
tPLH
50% VADJ to VO = 3.0 V, lO = 250 mA
—
—
5.0
µs
Supply Current
(Test Fig. 2)
lCC
RADJ = ∞, VS = 26 V, One Output ON
—
—
24
mA
RADJ = 0 Ω, VS = 26 V, Outputs OFF
—
8.0
10
mA
* lO is almost entirely Zener clamp current.
† Pulse test.
‡ Dependent on value of external series Zener diode (see Applications), 6.5 V without a Zener diode.
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Continued next page...
3625 AND 3626
POWERHALL®
SENSOR ICS/DRIVERS FOR
BRUSHLESS DC MOTORS
ELECTRICAL CHARACTERISTICS continued
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Both
Operate Point§
BOP
—
±100
±150
G
Hysteresis
BH
—
200
—
G
RADJ = 39 kΩ
—
0.75
—
—
RADJ = 17 kΩ
—
0.50
—
—
RADJ = 10 kΩ
—
0.25
—
—
VADJ = 0
—
-350
-500
µA
VT = 14 V
—
—
10
µA
IT = 750 µA
—
0.2
0.4
V
Output Current Limit Ratio
PWM Control Current
lO/lO MAX
IADJ
Tach Output Leak. Current
Tach Output Sat. Voltage
IT
VT(SAT)
Thermal Shutdown
TJ
––
165
—
°C
Thermal Hysteresis
∆TJ
––
10
—
°C
§ Magnetic flux density is measured at most sensitive area of device, nominally located 0.055" (1.40 mm) below the top of the package.
OUTPUT CLAMP VOLTAGE TEST
(ONE OUTPUT TESTED AT A TIME)
SUPPLY CURRENT TEST
Dwg. No. EP-013
TEST FIG. 1
TEST FIG. 2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3625 AND 3626
POWERHALL®
SENSOR ICS/DRIVERS FOR
BRUSHLESS DC MOTORS
ELEMENT LOCATION
APPLICATIONS INFORMATION
Power Dissipation. Care should be taken in evaluating the package power
dissipation of these devices. Total power dissipated by the device will consist
of power due to the internal regulator, logic and drive circuitry (ICC x VCC),
power due to the output drivers (IO x VO(SAT)), and power due to the clamp
circuitry (ICL x VCL x duty cycle).
For example:
ICC x VCC = 38 mA (max) x 14 V = 532 mW (max)
IO x VO(SAT) = 450 mA x 0.4 V (max) = 180 mW (max)
ICL x VCL x duty cycle = 450 mA x 15 V (max) x 1% = 67.5 mW (max)
Total package power dissipation = 779.5 mW (max)
Some of the power dissipated by the device (ICC x VCC) can be reduced
by inserting a Zener diode in the supply line (ZA in the figure). Note that the
voltage at the VCC pin under worst-case conditions must be greater than the
minimum operating voltage (6.5 V).
Transient Protection. A note of caution concerns negative (below ground)
excursions of the outputs. In application, the coupling of the two motor
windings can provide for just such a case. Reducing the coupling between
windings will help, but ground clamp diodes or diodes in series with the
motor windings might be required (DC or DS in the figure). Most small
brushless motors will not require these diodes.
System requirements usually utilize a diode type of reverse-polarity
protection. If series diode protection is used with an inductive load (the usual
fan application), a Zener clamp between VS and ground (ZB in the figure) is
required. The Zener voltage must be greater than the supply voltage but less
than the rated maximum allowable supply voltage.
With diode reverse-polarity protection, a high-impedance supply, or a
switched supply line, high-voltage spikes will be generated (especially with
high-current or high-inductance loads) during normal operation, coasting, or
immediately after turn-off. In these situations, a Zener clamp (ZB) from VS to
ground will be required.
Over-Current Adjust Pin. The over-current limit may be reduced from the
default value (IO MAX) by selection of an external resistor (RADJ) at the
PWM/IO ADJ pin.
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3625 AND 3626
POWERHALL®
SENSOR ICS/DRIVERS FOR
BRUSHLESS DC MOTORS
The external overcurrent adjust and the thermal shutdown are commoned
at the PWM/lO ADJ pin and tieing it to VCC will disable the thermal shutdown. PWM current/speed control can be performed at the PWM/lO ADJ pin
from a standard totem-pole logic output with a series Schottky diode
(1N5818,1N5819, or equivalent) or by pulling it low through an opencollector transistor (no pull-up resistor). PWM/lO ADJ input voltages greater
than 0.3 V are not recommended and may create an unstable operating
condition.
TYPICAL FAN APPLICATION
OUTA ON/LOW
MAGNETIC FIELD
DEFINITIONS
S
B=0G
+B O P
+B
-B
+B
-B O P
N
Dwg. AP-001-1
OUTB ON/LOW
Dwg. GP-008
By accepted magnetic convention, lines of flux emanate from the north pole of a magnet and enter the south pole.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3625 AND 3626
POWERHALL®
SENSOR ICS/DRIVERS FOR
BRUSHLESS DC MOTORS
Dimensions in Inches
(controlling dimensions)
8
0.014
0.008
5
0.430
MAX
0.280
0.240
0.300
BSC
1
0.070
0.045
4
0.005
MIN
0.400
0.355
0.210
MAX
0.015
0.150
0.115
MIN
0.022
0.014
0.100
BSC
NOTES: 1. Leads 1, 4, 5, and 8 may be half leads at vendor’s option.
2. Lead thickness is measured at seating plane or below.
3. Lead spacing tolerance is non-cumulative.
4. Exact body and lead configuration at vendor’s option
within limits shown.
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Dwg. MA-001-8A in
3625 AND 3626
POWERHALL®
SENSOR ICS/DRIVERS FOR
BRUSHLESS DC MOTORS
Dimensions in Millimeters
(for reference only)
0.355
0.204
5
8
10.92
MAX
7.11
6.10
7.62
BSC
4
1
1.77
1.15
0.13
MIN
10.16
9.02
5.33
MAX
0.39
3.81
2.93
MIN
0.558
0.356
2.54
BSC
Dwg. MA-001-8A mm
The products described herein are manufactured under one or
more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;
5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents
pending.
NOTES: 1. Leads 1, 4, 5, and 8 may be half leads at vendor’s option.
2. Lead thickness is measured at seating plane or below.
3. Lead spacing tolerance is non-cumulative.
4. Exact body and lead configuration at vendor’s option
within limits shown.
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 performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
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 that may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000