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UA9392 Datasheet(PDF) 5 Page - Unisonic Technologies

Part # UA9392
Description  4-CHANNEL BTL DRIVE FOR CD PLAYERS
Download  11 Pages
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UA9392 Datasheet(HTML) 5 Page - Unisonic Technologies

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UTC UA9392 LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO. LTD
5
QW-R109-010,A
CIRCUIT OPERATION
(1)
Fig. 2 shows the inputs from the digital servo IC for CH1-CH3 drivers(all drivers except the spindle).SW1 is on
when the forward input signal(HIGH level, over 2.4V) is present,SW2 I on when the reverse input signal is
present (Fig. 1) The constant current (I1) at this time enters the RC and generates an integral waveform based
on the duty of the input waveform. The BTL is output from BUF1 and BUF2 (Fig.3).
INTER-
FACE
F
R
SW1
SW2
I1
I2
24pF
100K
BUF1
BUF2
OUT R
OUT F
Fig. 1
To maintain the HIGH level with forward (or reverse) in-put, the DC voltage generated at point A is:
I1×R ≒ 2.5V (reverse : - 2.5V)
5V
0V
0V
F (R)
R (F)
INPUT
Fig. 2
This is the voltage generated relative VREF. The setting is such that a voltage differential of 5V is generated
be-tween output pins. The time constant is:
R×C = 2.4μsec
This can be increased by inserting a capacitor between point A (pin3,11and 18) and VREF·The constant current
(Iconst) given in the electrical characteristics refers to I1 and I2 in Fig.1.
(2)
CH4 driver (spindle driver) Pins 23 and 25 are shorted inside the IC.Bias amplitudes are the primarytype of
inputs assumed.
F
R
SW2
SW1
L
L
OFF
OFF
L
H
OFF
ON
H
L
ON
OFF
H
H
OFF
OFF
H: 2.4V Max.
L: 0.5V Min.


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