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BD61243FV Datasheet(PDF) 10 Page - Rohm |
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BD61243FV Datasheet(HTML) 10 Page - Rohm |
10 / 31 page . 10/27 © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001 www.rohm.com BD61243FV TSZ02201-0H1H0B101290-1-2 Jun.19.2015 Rev. 001 Application Circuit Examples (Constant Values are for Reference) 1. PWM Input Application It is an example of the application of the external PWM input, and controlling the rotational speed. In this application, minimum rotational speed can be set. Application Design Note (1) The bypass capacitor connected must be more than the recommended constant value because there is a possibility of the motor start-up failure etc. due to IC malfunction. Substrate Design Note (1) IC power(Vcc), motor power(Vm), motor outputs(OUT1, 2), and motor ground(MGND) lines are made as wide as possible. (2) IC ground (GND) line is common with the application ground except motor ground (i.e. hall ground etc.), and arranged near to (–) land. (3) The bypass capacitor and/or Zenner diode are placed near to VCC pin. (4) H+ and H– lines are arranged side by side and made from the hall element to IC as short as possible, because it is easy for the noise to influence the hall lines. Figure 20. PWM Input Application Reverse Polarity Protection Measure against back EMF + PWM - M H HALL BIAS SIG to 1kΩ 0.22Ω to 1μF to 1kΩ to 100kΩ 1kΩ to 100kΩ PWM SLOPE RNF H+ H- OUT1 REF MIN SSW TSD CONTROL LOGIC OSC FILTER VCC REFE- RENCE PRE- DRIVER ZPER OUT2 INSIDE REG 13 12 11 10 2 3 4 5 6 7 9 8 FG SIGNAL OUTPUT 1 GND 14 + - COMP Maximum output voltage and current are 18V and 1.2A respectively Connect bypass capacitor near VCC terminal as much as possible. Soft switching setting Minimum duty setting Stabilization of REF voltage Re-circulate setting Hall bias is set according to the amplitude of hall element output and hall input voltage range. Protection of FG open-drain To limit motor current, the current is detected. Note the power consumption of sense resistance. Noise measures of substrate Low-pass filter for rotation speed instruction input I/O duty slope setting Linearization correction resistance |
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