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UA8868S Datasheet(PDF) 4 Page - Unisonic Technologies

Part No. UA8868S
Description  5-CHANNEL BTL DRIVER FOR DVD PLAYER
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
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UA8868S Datasheet(HTML) 4 Page - Unisonic Technologies

   
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UTCUA8868S
LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
4
www.unisonic.com.tw
QW-R109-021,B
POWER DISSIPATION CURVE:
25
50
75
100
125
150
Ta (℃)
1.0
1.5
2.0
Pd (W)
*70mm×70mm×1.6mm glass epoxy board.
*Debating in done at 17.6mW/℃ for operating above Ta=25℃
OPERATING NOTES:
(1) The built-in thermal shutdown circuit mutes the output current when the chip temperature reaches 175℃( typ.). The
hysteresis is set to 25℃(typ.), so the circuit will start up again when the chip temperature falling to 150℃ (typ.).
(2) In case mute pin voltage is under 0.5V or NC, output current is muted (except for tray motor driver). Mute pin voltage
should be more than 2.0V for normal application.
(3) when Vcc1 voltage drop to below 3.8V,shematice are muteed. The schematic will return to work when Vcc1 rise up
with a hysterisis of 03.V(typ.)
(4) Bias pin (pin 27) should be pulled up to more than 1.2V. In case the bias pin voltage is pulled down below 0.9V (typ.),
the output current is muted.
(5) Insert the bypass capacitor (~ 0.1µF ) between Vcc pin and GND pin as close as possible.
(6) Heat dissipation fins are attached to the GND on the inside of the package. Make sure to connect them to the
external GND.
(7) Tray driver logic input:
FWD (pin6)
REV (pin7)
VOTR+ (pin10)
VOTR- (pin9)
Function
L
L
OPEN
OPEN
Open mode
L
H
L
H
Reverse mode
H
L
H
L
Forward mode
H
H
L
L
Brake mode
Input circuit of pin6 and pin7 is designed to avoid simultaneous activation of upper and lower output tr. ; however, in
order to improve reliability, apply motor forward/reverse input once through open mode.
We recommend time period for open longer than 10msec.
The voltage between “H” side Output voltage and “L” side output voltage is eaqual to three times (9.2dB Typ.) VTCL
voltage (pin21). And the “H” side and “L” side output voltage both eaqual to VCC/2 when in open mode and brake mode.


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