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PDF SA9258 Data sheet ( Hoja de datos )

Número de pieza SA9258
Descripción 4-CH BTL DRIVER
Fabricantes Silan Microelectronics 
Logotipo Silan Microelectronics Logotipo



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SA9258 Hoja de datos, Descripción, Manual
SA9258
4-CH BTL DRIVER FOR CD PLAYER WITH 5V OUTPUT VOLTAGE
DESCRIPTION
The SA9258, an IC for CD players, has a 4-channel BTL driver, 5V
regulator (attached PNP transistor required), standard operational
amplifier, and internal reset output linked to an internal thermal shutdown
circuit. The driver has gain adjustment input pins for each channel,
allowing gain to be set to the desired value. Also, the internal level shift
circuit helps reduce the number of attached components.
FEATURES
* 1-phase, full-wave, linear DC motor driver
* Gain is adjustable with an attached resistor.
* Internal standard operational amplifier.
* Internal 5V regulator. (required attached PNP transistor)
* Internal thermal shutdown circuit with hysteresis capabilities.
ORDERING INFORMATION
Device
SA9258
Package
HSOP-28-375-0.8
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.7 2009.03.10
Page 1 of 11
Free Datasheet http://www.datasheet4u.com/

1 page

SA9258 pdf
SA9258
5) If the chip temperature rises above 175°C, then the TSD (Thermal Shutdown) circuit is activated and the
output circuit is muted.
2. TSD (THERMAL SHUTDOWN)
VREF
R1
R2
Output Driver
Bias
Qn
1) The VREF is the output voltage of the band-gap-referenced biasing circuit and acts as the input voltage of the
TSD circuit.
2) The base-emitter voltage of the TR, Qn is designed to turn-on at below voltage.
VBE=VREF * R2/(R1+R2)=460mV
3) When the chip temperature rises up to 175°C, then the turn-on voltage of the Qn would drop down to 460mV.
(Hysteresis: 25°) and, the Qn would turn on so the output circuit will be muted.
3. OP-AMP
OP-Amp is integrated in the IC for user convenuence.
OPIN(+)
OPIN(-)
OPOUT
Pins 14, 15 and 16 may be left open when the operational amplifier is not used.
4. DRIVER
1) The voltage, VREF, is the reference voltage given by the BIAS voltage of the pin #23.
2) The input signal through the pin #3 is amplified by 10K/10K times and then fed to the level shift.
3) The level shift produces the current due to the difference between the input signal and the arbitrary reference
signal. The current produced as +ΔV and -ΔV is fed into the driver buffer.
4) Driver buffer operates the power TR of the output stage according to the state of the input signal.
5) The output stage is the BTL driver and the motor is rotating in forward direction by operating TR Q1 and TR
Q4. on the other hand, if TR Q2 and TR Q3 is operating, the motor is rotating in reverse direction.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.7 2009.03.10
Page 5 of 11
Free Datasheet http://www.datasheet4u.com/

5 Page



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