參數(shù)資料
型號(hào)： TZA1025
廠商： NXP Semiconductors N.V.
英文描述： Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC)(應(yīng)用在CD音頻和視頻光學(xué)系統(tǒng)（ADALAS）中的數(shù)據(jù)放大器和激光電源電路)
中文描述： 數(shù)據(jù)放大器和激光CD音頻和視頻（ADALASLC）（應(yīng)用在光碟音頻和視頻光學(xué)系統(tǒng)（ADALAS）中的數(shù)據(jù)放大器和激光電源電路光學(xué)系統(tǒng)的電源電路）
文件頁(yè)數(shù)： 5/16頁(yè)
文件大?。?/td> 122K
代理商： TZA1025
1998 Oct 30
5
Philips Semiconductors
Product specification
Data amplifier and laser supply circuit for CD
audio and video optical systems (ADALASLC)
TZA1025
Automatic laser power control circuit
The ALPC stabilises the laser output power thereby
reducing the effect of ageing of the laser.
The TZA1025 automatically detects when an
N- or P-substrate monitor diode is used and selects the
correct reference voltage. A simplified diagram for the use
of an N- or P-substrate monitor diode is given in Fig.4.
The gain of the loop can be controlled (reduced) by adding
an external resistor between pins RGADJ and GND.
The loop gain then becomes:
(2)
where:
G
loop
is the loop gain
G
ALPC
is the ALPC transfer (60 A/V)
G
lm
is the laser-to-monitor transfer (V/A)
G
con
is the extra gain introduced when a DC-to-DC
converter is used in the loop; G
con
= 1 when no
DC-to-DC converter is used
250 is a fixed internal resistor value (
)
R
RGADJ
is the value of the external resistor (
).
The minimum available output current is also reduced
when an external resistor is used. The formula to
determine the minimum available output current is shown
in equation (3).
250
R
RGADJ
+
(3)
G
loop
G
ALPC
G
lm
×
G
con
×
RGADJ
250
×
=
I
o
I
o(LASER)(max)
------------250
×
=
where:
I
o
is output current (mA)
I
o(LASER)(max)
is the maximum laser output current (mA)
250 is a fixed internal resistor value (
)
R
RGADJ
is the value of the external resistor (
).
The bandwidth of the loop is determined by the external
filter capacitor C
CFIL
and the loop gain. The formula to
determine the bandwidth is shown in equation (4).
16 10
6
×
G
loop
(4)
where:
C
CFIL
is the value of the capacitor (F)
G
loop
is the loop gain.
The TZA1025 has a protection circuit to prevent laser
damage that can occur due to a dip of V
DD(L)
. When a dip
occurs the output transistor (see Fig.4) will go into
saturation making it unable to supply the required laser
current. Without the protection circuit the ALPC would still
try to supply the required laser current by charging the filter
capacitor C
CFIL
. After the dip a fully charged capacitor
would create a large output current during the few
milliseconds it needs to discharge the capacitor to a
normal level. The protection circuit monitors the output
transistor and switches off the ALPC when saturation
occurs by discharging the capacitor. The ALPC will
automatically restart within a few milliseconds after the dip
has passed.
τ
-3dB
CFIL
C
=
Fig.4 Automatic Laser Power Control (ALPC) loop.
a. N-substrate monitor diode.
b. P-substrate monitor diode.
handbook, full pagewidth
MGR519
DC-TO-DC
CONVERTER
CCFIL
CCFIL
150 mV
DC-TO-DC
CONVERTER
VDD(L)
VDD
VDD
150 mV
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