PRIMER ESSENTIALS OUTPUT VOLTAGE LIMITATIONS Typically, overcomin

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PRIMER ESSENTIALS OUTPUT VOLTAGE LIMITATIONS
PRIMER ESSENTIALS OUTPUT VOLTAGE LIMITATIONS
Typically, overcoming foremost roadblocks successfully reliably applying power "smart-power" involves understanding critical specifications.
COLLECTOR CURRENT
CE(sus)
"CUSP" TIME
CE(sat)
COLLECTOR VOLTAGE
(BR)CBO
first device's specified maximum allowable output voltage. Whether maximum load supply voltage (VBB), collector supply voltage (VCC), output voltage OUT) value approximates V(BR)CBO. Typically, this absolute maximum rating guaranteed leakage current measurement specified maximum value. This limit satisfactory resistive loads some capacitive loads (see Figure Should output load line cross sustaining voltage curve, "stored" energy involved. Thus, device damage unlikely although output voltage waveshape aberrations "cusp") during turn-off often occur. second consideration relates specified minimum collector-emitter output) sustaining voltage inductive loads. Many inductive load applications involve substantial stored energy. output load line during turn-off resembles that Figure this stored energy cause instantaneous, catastrophic failure device. safe, reliable operation with inductive loads, important (even imperative) that circuit load line intersect sustaining voltage curve. Without proper output voltage limiting clamping, turn-off voltage across output (will usually) exceed device capability! Protection easily accomplished providing:
Dwg. GP-047
Figure Load Line with Resistive Load
INDUCTIVE LOAD LINE
COLLECTOR CURRENT
CE(sus)
POTENTIALLY DESTRUCTIVE ENERGY
diode clamp (usually called "flyback" "recirculating diode") across inductive load, Zener-diode clamp supply ground, snubber network.
CE(sat)
COLLECTOR VOLTAGE
(BR)CBO
Dwg. GP-047-1
Figure Load Line with Inductive Load
rapid current decay (fast turn-off speeds), using Zener diodes will raise flyback voltage during turn-off improve performance. However, transient/momentary/peak/spike voltage must exceed specified minimum sustaining voltage.
MicroSystems, Inc.
PRIMER ESSENTIALS OUTPUT VOLTAGE LIMITATIONS
INDUCTIVE LOAD
Power supply circuit values chosen such that (supply) (diode forward voltage) (Zener voltage, used) VCE(sus). Further, reliable operation, peak current ratings both flyback Zener diodes must least high load current. Note surge power ratings Zener diodes typically greater than times continuous rating repetitive, low-duty cycle 10%) applications.
Dwg. EP-058
OUTPUT VOLTAGE
output voltage ratings popular Allegro power drivers follows. Some these sustaining voltage ratings (bold faced) presently appear Allegro data sheets; these specifications will added next revisions. Additional assistance pertaining sustaining voltage issues provided Allegro Applications Engineering.
CE(SAT)
OUTPUT CURRENT
ZENER CLAMP DIODE CLAMP
Dwg. WP-001
Figure "Protected" Inductive Load Driver
Part Number(s) 2064 2065 2068 2069 2540 2543 2544 2547 2549 2559 2580
Max. VBB, VCC, VOUT, VCEX cont'd
Min. VOUT(SUS), VCE(SUS), VCE(sus)
Internal clamp diodes
MicroSystems, Inc.
Northeast Cutoff, 15036 Northeast Cutoff, 1503601615-0036 (508) 853-5000 Worcester, Massachusetts Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1994, Allegro MicroSystems, Inc.
PRIMER ESSENTIALS OUTPUT VOLTAGE LIMITATIONS
Part Number 2585 2588 2596 2597 2878 2878-2 2879
Max. VBB, VCC, VOUT, VCEX
Min. VOUT(SUS), VCE(SUS), VCE(sus)
Internal clamp diodes req'd
2916, 2917, 2918, 2919 2936 2936-120 2944 2961 2962 2981 2982 2983 2984 2985 2987 2998 3625 Hall 3626 Hall 3952 3953 3961 3962 5140 Hall 5275 Hall 5800 5801 5804 5821 5829 5841 5842 5890 5891 5895 7003 8902 8925
50~35 (use 5841 inductive loads)
Maximum allowable supply voltage specified higher. Listed here maximum useful operating voltage defined internal overvoltage shutdown current limiting.
Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements design products. Components made under military approvals will accordance with approval requirements. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringements patents other rights third parties which result from use.

PRIMER ESSENTIALS OUTPUT VOLTAGE LIMITATIONS Typically, overcomin

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