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SLA7026M Datasheet(PDF) 10 Page - Allegro MicroSystems

No. de pieza SLA7026M
Descripción Electrónicos  HIGH-CURRENT PWM, UNIPOLAR STEPPER MOTOR CONTROLLER/DRIVERS
Download  12 Pages
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Fabricante Electrónico  ALLEGRO [Allegro MicroSystems]
Página de inicio  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

SLA7026M Datasheet(HTML) 10 Page - Allegro MicroSystems

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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
SLA7024M, SLA7026M, AND SMA7029M
HIGH-CURRENT PWM,
UNIPOLAR STEPPER MOTOR
CONTROLLER/DRIVERS
PACKAGE RATINGS/DERATING FACTORS
Thermal ratings/deratings for the multi-chip module packages vary
slightly. Normally, the SLA7024M and SMA7029M do not need heat
sinking when operated within maximum specified output current (
≤1.0 A
with 2-phase drive) unless the design ambient temperature also ex-
ceeds +60
°C. Thermal calculations must also consider the temperature
effects on the output FET ON resistance. The applicable thermal
ratings for the PMCM packages are:
SLA7024M and SLA7026M 18-Lead Power-Tab SIP
RΘJA = 28°C/W (no heat sink) or 4.5 W at +25°C and a derating
factor of -36 mW/
°C for operation above +25°C. R
ΘJC = 5°C/W.
SMA7029M 15-Lead SIP
RΘJA = 31°C/W (no heat sink) or 4.0 W at +25°C and a derating
factor of -32 mW/
°C for operation above +25°C. R
ΘJC = 6°C/W.
TEMPERATURE EFFECTS ON FET
r
DS(on)
Analyzing safe, reliable operation includes a concern for the
relationship of NMOS ON resistance to junction temperature. Device
package power calculations must include the increase in ON resistance
(producing higher output ON voltages) caused by higher operating
junction temperatures. Figure 8 provides a normalized ON resistance
curve, and all thermal calculations should consider increases from the
given +25
°C limits, which may be caused by internal heating during
normal operation.
FIGURE 8. NORMALIZED ON RESISTANCE
vs TEMPERATURE
2.0
1.0
-40
+80
+160
0.5
JUNCTION TEMPERATURE in
°C
Dwg. GK-017
1.5
2.5
0
0
+40
+120


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