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BA3935

Rohm
Part Number BA3935
Manufacturer Rohm
Description Reference voltage power supply
Published Apr 1, 2005
Detailed Description Regulator ICs Reference voltage power supply BA3935 The BA3935 is a monolithic reference voltage power supply IC for us...
Datasheet PDF File BA3935 PDF File

BA3935
BA3935

Overview
Regulator ICs Reference voltage power supply BA3935 The BA3935 is a monolithic reference voltage power supply IC for use in CD radio cassette players.
FApplications CD radio cassette players, mini-component stereo audio systems FFeatures 1) With 9V output for audio power supply, 5V output for microcontrollers, 5V output for radio, 5 and 7.
5V outputs for CD players, 9.
5V 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).
FBlock diagram 3) Zero standby current.
(Type.
) 4) Output current limit circuit protects the IC against short-circuiting damage.
5) Compact SIP-M12 package allows a large power dissipation (3W : no heat sink).
6) Thermal protection circuit prevents heat damage to the IC.
167 Regulator ICs FPin descriptions BA3935 FAbsolute maximum ratings (Ta = 25_C) FRecommended operating conditions 168 Regulator ICs FInput / output circuits BA3935 169 Regulator ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 16.
0V) BA3935 170 Regulator ICs BA3935 FCircuit operation (1) Timing chart (2) Estimate of allowable power dissipation Except under transitional conditions, the power dissipation of this IC is 3W per unit at 25_C.
See Fig.
1 for thermal derating characteristics, including some cases where heat sinks are used.
FThermal derating curve AUDIO 9V, MOTOR 9.
5V, and COM 5V are output regardless of MODE SW.
RADIO 5V rises when MODE SW is 1.
4V (typical), and CD 5V and CD 7.
5V rise when MODE SW is 3.
2V (typical).
171 Regulator ICs FCircuit operation BA3935 Calculation of PMAX.
S Power consumed by AUDIO 9V P1 = (VCC * 9.
0V) I1 S Power consumed by MOTOR 9.
5V I2 P2 = (VCC * 9.
5V) S Power consumed by CD 7.
5V I3 P3 = (VCC * 7.
5V) S Power consumed by CD 5.
0V I4 P4 = (VCC * 5.
0V) S Power consumed by RADIO 5.
0V I5 P5 = (VCC * 5.
0V) S Power consume...


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