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SLA7024M Datasheet(PDF) 10 Page - Allegro MicroSystems |
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SLA7024M Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 12 page 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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