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參數(shù)資料
| 型號： | UA9392 |
| 廠商： | 友順科技股份有限公司 |
| 英文描述： | 4-CHANNEL BTL DRIVE FOR CD PLAYERS |
| 中文描述： | 4通道橋接驅(qū)動CD播放機 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 141K |
| 代理商： | UA9392 |
UTC UA9392 LINEAR INTEGRATED CIRCUIT
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 (I
1
) 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).
UTC
UNISONIC TECHNOLOGIES CO. LTD
5
QW-R109-010,A
INTER-
FACE
F
R
SW1
SW2
I
1
I
2
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:
I
1
×
R
≒
2.5V (reverse : - 2.5V)
5V
0V
0V
F (R)
R (F)
INPUT
Fig. 2
This is the voltage generated relative V
REF
. The setting is such that a voltage differential of 5V is generated
be-tween output pins. The time constant is:
R
×
C = 2.4
μ
sec
This can be increased by inserting a capacitor between point A (pin3,11and 18) and V
REF
·
The constant current
(Iconst) given in the electrical characteristics refers to I
1
and I
2
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
L
L
OFF
L
H
OFF
H
L
ON
H
H
OFF
H: 2.4V Max.
L: 0.5V Min.
SW1
OFF
ON
OFF
OFF
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