SA6392 Datasheet, PDF (5/9 Pages) Silan Microelectronics Joint-stock – 4CHANNEL BTL DRIVER FOR CD PLAYERS

SA6392
Fig.2
To maintain the HIGH level with forward (or reverse) in-put, the DC voltage generated at point A is:
I1 x R ≈ 2.5V (reverse: - 2.5V)
This is the voltage generated relative VREF. The setting is such that a voltage differential of 5V is generated
between output pins. The time constant is:
RxC = 2.4µ sec
This can be increased by inserting a capacitor between point A (pins 3, 11 and 18) and VREF. The constant
current (Iconst) given in the electrical characteristics refers to I1 and I2 in Fig. 2.
F
R
SW1
SW2
L
L
OFF
OFF
L
H
OFF
ON
H
L
ON
OFF
H
H
OFF
OFF
H… 2.4V Max.
L… 0.5V Min.
Fig.3
(2) CH4 driver (spindle driver)
Pins 23 and 25 are shorted inside the IC. Bias amplitudes are the primary type of inputs assumed. The level
shift circuit converts the pre-stage amplifier output (centered on the bias level and impressed on pins 23 and 25)
to positive and negative amplitudes centered on VREF. The level shift circuit’s output is BTL-output from the
buffer amplifier.
Because of the high input impedance, the IC is designed to accommodate a filter comprising attached resistors
and capacitors.
OPERATION NOTES
(1) The SA6392 has an internal thermal shutdown circuit. Output current is muted when the chip temperature
exceeds 180°C (typically).
(2) The output current can also be muted by lowering the mute pin (pin 15) voltage below 0.5V.
(3) All four driver output channels are muted during thermal shutdown, muting and a drop in bias pin voltage. No
other components are muted.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.2 2004.02.12
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