TZA1048 データシートの表示（PDF） - Philips Electronics
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TZA1048 Datasheet PDF : 17 Pages
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Philips Semiconductors
4-channel BTL driver for CD/DVD drives
Product specification
TZA1048
VCC 1
RADOUTN 2
FOCOUTP 3
GND 4
FOCOUTN 5
RADOUTP 6
VCC 7
28 VOUT3.3
27 VFBIN3.3
26 VOUT1.8
25 VFBIN1.8
24 MUTE
23 RADIN
22 FOCIN
TZA1048TH
VCC 8
SLOUTP 9
SLOUTN 10
GND 11
MOTOUTP 12
MOTOUTN 13
VCC 14
21 SLIN
20 VBIASIN
19 GND
18 VBIASOUT
17 MOTBIAS
16 MOTIN1
15 MOTIN2
mce471
Fig.2 Pin configuration.
7 FUNCTIONAL DESCRIPTION
7.1 General notes
1. The integral thermal shut-down circuit mutes the
output current when the chip temperature reaches
175 °C (typical). The hysteresis is set to 25 °C
(typical), so the circuit will restart when the chip
temperature falls to 150 °C (typical).
2. Mute mode is activated when the voltage at pin MUTE
is below 0.5 V, and deactivated when the voltage at
pin MUTE is above 1.2 V. In mute mode, both positive
and negative output terminals will be at
high-impedance state. However, the 3.3 V and 1.8 V
outputs are not affected.
3. It is recommended that a 220 µF decoupling capacitor
is connected between pins VCC and pin GND and
physically located as close as possible to these supply
pins.
4. The positive outputs of the focus, radial and sled driver
channels are in phase with their respective input
signals. The positive output of the spindle driver
channel is in phase with the input signal on
pin MOTIN1.
5. The values of the resistors connected to each input
channel must be equal to, or larger than, 4.7 kΩ to
ensure that the gain of each input stage is less than, or
equal to 1.
6. The GND pins are internally connected to heat
dissipation fins within the package. You must ensure
that these pins are connected to an external ground.
7. The 1.65 V bias voltage output from pin VBIASOUT is
derived from the internal 3.3 V generator/regulator,
and will be affected by any variation in the 3.3 V
generator/regulator voltage.
2004 Mar 09
6
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