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參數(shù)資料
| 型號： | 2549 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | PROTECTED QUAD POWER DRIVER |
| 中文描述： | 四功率驅(qū)動保護(hù) |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 137K |
| 代理商： | 2549 |
2549
PROTECTED
QUAD POWER DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
CIRCUIT DESCRIPTION AND APPLICATION
INCANDESCENT LAMP DRIVER
High incandescent lamp turn-ON/in-rush currents can contribute to
poor lamp reliability and destroy semiconductor lamp drivers. Warming
or current-limiting resistors protect both driver and lamp but use signifi-
cant power either when the lamp is OFF or when the lamp is ON,
respectively. Lamps with steady-state current ratings up to 600 mA
can be driven by these devices without the need for warming (parallel)
or current-limiting (series) resistors.
When an incandescent lamp is initially turned ON, the cold filament
is at minimum resistance and would normally allow a 10x to 12x in-rush
current. With the these drivers, during turn-ON, the high in-rush current
is sensed by the internal low-value sense resistor. Drive current to the
output stage is then diverted by the shunting transistor, and the load
current is momentarily limited to approximately 1.0 A. During this short
transition period, the output current is reduced to a value dependent on
supply voltage and filament resistance. During lamp warmup, the
filament resistance increases to its maximum value, the output stage
goes into saturation and applies maximum rated voltage to the lamp.
INDUCTIVE LOAD DRIVER
Bifilar (unipolar) stepper motors, relays, or solenoids can be driven
directly. The internal flyback diodes prevent damage to the output
transistors by suppressing the high-voltage spikes which occur when
turning OFF an inductive load. For rapid current decay (fast turn-OFF
speeds), the use of Zener diodes will raise the flyback voltage and
improve performance. However, the peak voltage must not exceed the
specified minimum sustaining voltage (V
SUPPLY
+ V
Z
+ V
F
≤
V
OUT(SUS)
).
FAULT CONDITIONS
In the event of a shorted load, the load current will attempt to
increase. As described above, the drive current to the affected output
stage is reduced, causing the output stage to go linear, limiting the peak
output current to approximately 1 A. As the power dissipation of that
output stage increases, a thermal gradient sensing circuit will become
operational, further decreasing the drive current to the affected output
stage and reducing the output current to a value dependent on supply
voltage and load resistance.
Continuous or multiple overload conditions causing the chip tem-
perature to reach approximately 165
°
C will result in an additional
reduction in output current to maintain a safe level.
If the fault condition is corrected, the output stage will return to its
normal saturated condition.
TYPICAL OUTPUT
CHARACTERISTIC
V
OUT(SAT)
Dwg. GP-013
O
O
OUTPUT CURRENT, I
OUT
T < 150
°
C
T = 165
°
C
JUNCTION
TEMP. LIMIT
NOT TO SCALE
TRIP
I
THERMAL
GRADIENT
SENSING
TYPICAL OUTPUT BEHAVIOR
NORMAL LAMP IN-RUSH CURRENT
TIME
THERMAL GRADIENT SENSING
CURRENT LIMIT
Dwg. WP-008
NOT TO SCALE
I
TRIP
0
L
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|---|---|
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