Block Diagram - Harman Kardon HK 990/230 Service Manual


LOW DROPOUT VOLTAGE (1V TYP)
■
2.85V DEVICE PERFORMANCES ARE
■
SUITABLE FOR SCSI-2 ACTIVE
TERMINATION
OUTPUT CURRENT UP TO 800mA
■
FIXED OUTPUT VOLTAGE OF: 1.8V, 2.5V,
■
2.85V, 3.0V, 3.3V, 5.0V
ADJUSTABLE VERSION AVAILABILITY
■
(V =1.25V)
ref
INTERNAL CURRENT AND THERMAL LIMIT
■
AVAILABLE IN ± 1% (AT 25
■
FULL TEMPERATURE RANGE
SUPPLY VOLTAGE REJECTION : 75 dB (TYP)
■
TEMPERATURE RANGE : 0
■
DESCRIPTION
The LD1117 is a LOW DROP Voltage Regulator
able to provide up to 800mA of Output Current,
available even in
(V =1.25V). Concerning fixed versions, are
ref
offered the following Output Voltages: 2.5V,
2.85V, 3.0V 3.3V and 5.0V. The 2.85V type is
ideal for SCSI-2 lines active termination. The
device is supplied in: SOT-223, DPAK, SO-8
and TO-220. The SOT-223 and DPAK surface
mount packages optimize
characteristics even offering a relevant space
saving effect. High efficency is assured by NPN

BLOCK DIAGRAM

March 2001
LOW DROP FIXED AND ADJUSTABLE
POSITIVE VOLTAGE REGULATORS
o
C) AND 2% IN
o o
C TO 125 C
adjustable version
the thermal
54
SOT-223
TO-252 (DPAK)
pass transistor. In fact in this case, unlike than
PNP one, the Quiescent Current flows mostly
into the load. Only a very common 10µF
minimum capacitor is neede d for stability. On
chip trimming allows the regulator to reach a
very tight output voltage tolerance, within ± 1%
o
at 25 C. The ADJUSTABLE LD1117 is pin to
pin compatible with
Adjustable voltage regulators maintaining the
better performances in terms of Drop and
Tolerance.
LD1117
SERIES
SO-8
TO-220
the other standard
1/18