BA3932 ROHM | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 7

Technical content

Features

1) With 9.0V output for audio power supply, 5.0V output for microcontrollers, 5.0 and 8.0V outputs for CD players, 14.7V output for motor drivers, the IC is best suited for CD radio cassette players. 2) Precise power supply (5V ± 0.1V) can be obtained by using external reference voltage input (only AUDIO output has an internal reference voltage system). 3) Zero standby current. (Typ.) 4) Output current limit circuit protects the IC against short-circuiting damage. 5) Compact SIP-M12 package allows a large power dis- sipation (3W: no heat sink). 6) Thermal protection circuit prevents heat damage to the IC. Absolute maximum ratings (Ta = 25C) Recommended operating conditions

Electrical characteristics (unless otherwise noted, Ta = 25C and VCC = 16.0V)

(1) Timing chart AUDIO 9V, MOTOR 14.7V, and COM 5V are output re- gardless of MODE SW. RADIO 5V rises when MODE SW is 1.4V (typical), and CD 8V and CD 5V rise when MODE SW is 3.2V (typical). (2) Estimate of allowable power dissipation Except under transitional conditions, the power dissipa- tion of this IC is 3W per unit at 25C. See Fig. 3 for heat reduction characteristics, including some cases where heat sinks are used.

/C0083Power consumed by AUDIO 9V P1 = (VCC – 9.0V)I1 /C0083Power consumed by MOTOR 14.7V P2 = (VCC – 14.7V)I2 /C0083Power consumed by CD 8.0V P3 = (VCC – 8.0V)I3 /C0083Power consumed by CD 5.0V P4 = (VCC – 5.0V)I4 /C0083Power consumed by RADIO 5.0V P5 = (VCC – 5.0V)I5 /C0083Power consumed by COM 5.0V P6 = (VCC – 5.0V)I6 /C0083Power consumed internally by each circuit P7 = VCC circuit current ∗ I1 = maximum output for AUDIO 9V I2 = maximum output for MOTOR 14.7V I3 = maximum output for CD 8.0V I4 = maximum output for CD 5.0V I5 = maximum output for RADIO 5.0V I6 = maximum output for COM 5.0V Operation notes (1) Operating power supply voltage When operating within proper ranges of power supply voltage and ambient temperature, most circuit functions are guaranteed. Although the rated values of electrical characteristics cannot be absolutely guaranteed, char- acteristic values do not change drastically within the proper ranges. (2) Power dissipation (Pd) Refer to the heat reduction characteristics (Fig. 3) and the rough estimation of IC power dissipation given on a separate page. Make sure to use the IC within the allow- able power dissipation with a sufficient margin. (3) Preventing oscillation at each output and installing a ripple filter capacitor. To stop oscillation of output, make sure to connect a ca- pacitor between GND and each of the AUDIO 9V (pin 1), RADIO (pin 4), COM (pin 5), CD 5V (pin 6), CD 8V (pin 7), and MOTOR 14.7V (pin 11) output pins. We recom- mend using a tantalum electrolytic capacitor having a ca- pacitance of 10µF or greater (100µF or greater for AU- DIO 9V) with minimal temperature susceptibility. Also, sudden deterioration of the AUDIO 9V ripple rejection during a power drop can be prevented by connecting a capacitor (220µF or greater recommended) to the C pin (pin 2). (4) Overcurrent protection circuit An overcurrent protection circuit is installed on the AU- DIO 9V (pin 1), RADIO (pin 4), COM (pin 5), CD 5V (pin 6), CD 8V (pin 7), and MOTOR 14.7V (pin 11) outputs, based on the respective output current. This prevents IC destruction by overcurrent, by limiting the current with a curve shape of “7” in the voltage-current graph. The IC is designed with margins so that current flow will be re- stricted and latching will be prevented even if a large cur- rent suddenly flows through a large capacitor. Note that these protection circuits are only good for preventing damage from sudden accidents. Make sure your design does not cause the protection circuit to operate continu- ously under transitional conditions (for instance, if output is clamped at 1V F or higher, short mode circuit operates at 1VF or lower).

(5) Reference voltage Because output voltage is dependent on the input refer- ence voltage, unstable input results in output wavering and degradation of ripple rejection. Take care when set- ting the reference voltage power supply. Note that the AUDIO output, which has a built-in reference voltage system, is not affected by the external reference voltage. (6) Thermal protection circuit A built-in thermal protection circuit prevents thermal damage to the IC. All outputs are switched OFF when the circuit operates, and revert to the original state when temperature drops to a certain level. (7) Grounding Each ground line in the application circuit must be ade- quately short regarding the PREGND (pin 3) and GND (pin 12) pins. Make sure to arrange the ground lines, the AUDIO system, and other outputs in a pattern that pre- vents electric interference. Thermal derating curve External dimensions (Units: mm)