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BD63621MUV Scheda tecnica(PDF) 18 Page - Rohm |
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BD63621MUV Scheda tecnica(HTML) 18 Page - Rohm |
18 / 29 page 18/24 BD63621MUV TSZ02201-0P2P0B701290-1-2 © 2017 ROHM Co., Ltd. All rights reserved. 21.Dec.2020 Rev.002 www.rohm.com TSZ22111・15・001 Power dissipation Please confirm that the IC’s chip temperature Tj is not over 150°C, while considering the IC’s power consumption (W), Thermal Resistance(°C/W) and ambient temperature (Ta). When Tj=150°C is exceeded the functions as a semiconductor do not operate and problems such as parasitism and leaks occur. Constant use under these circumstances leads to deterioration and eventually destruction of the IC. Tjmax=150°C must be strictly obeyed under all circumstances. Thermal Calculation The IC’s consumed power can be estimated roughly with the power supply voltage (VCC), circuit current (ICC), output ON resistance (RONH,RONL) and motor output current value (IOUT). The calculation method during FULL STEP drive, SLOW DECAY mode is shown here: Consumed power of the Vcc [W] = VCC [V]・ICC [A] ・・・・・・・① Consumed power of the output DMOS [W] = (RONH[ Ω] + RONL[Ω])・IOUT [A]2・2[ch]・on_duty During output ON + (2・RONL[ Ω])・IOUT [A]2・2[ch]・(1 - on_duty) ・・・・・・・② During current decay However, on duty: PWM on duty = ton / (tchop) ton varies depending on the L and R values of the motor coil and the current set value. Please confirm by actual measurement, or make an approximate calculation. tchop is the chopping period, which depends on the external CR. See P.8 for details. IC number Upper PchDMOS ON Resistance RONH[ Ω] (Typ) Lower NchDMOS ON Resistance RONL[ Ω] (Typ) BD63621MUV 0.32 0.17 Consumed power of total IC W_total [W] = ① + ② Junction temperature Tj = Ta[°C] + θja[°C/W]・W_total [W] However, the thermal resistance value θja °C/W differs greatly depending on circuit board conditions. Refer to the thermal resistance on P.10. Also, we are taking measurements of thermal resistance value θja of boards actually in use. Please feel free to contact our salesman. The calculated values above are only theoretical. For actual thermal design, please perform sufficient thermal evaluation for the application board used, and create the thermal design with enough margin to not exceed Tjmax=150°C.Although unnecessary with normal use, if the IC is to be used under especially strict heat conditions, please consider externally attaching a Schottky diode between the motor output terminal and GND to abate heat from the IC. ○Temperature Monitoring In respect of BD63621MUV, there is a way to directly measure the approximate chip temperature by using the TEST or MODEx terminal with a protection diode for prevention from electrostatic discharge. However, temperature monitor using this TEST terminal is only for evaluation and experimenting, and must not be used in actual usage conditions. (1) Measure the terminal voltage when a current of Idiode=50µA flows from the TEST or MODEx terminal to the GND, without supplying VCC to the IC. This measurement is of the Vf voltage inside the diode. (2) Measure the temperature characteristics of this terminal voltage. (Vf has a linear negative temperature factor against the temperature.) With the results of these temperature characteristics, chip temperature may be calibrated from the TEST terminal voltage. (3) Supply VCC, confirm the TEST terminal voltage while running the motor, and the chip temperature can be approximated from the results of (2). Figure 9. Model diagram for measuring chip temperature -Vf[mV] 25 150 Chip temperature Tj[°C] Monitor terminal Vf Internal circuit Idiode |
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