Harman Kardon AVR 171/230, Service Manual

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DB1230
3A, 700KHz, Synchronous Step-down Converter
Preliminary Datasheet DB1230P-02
19. Oct. 2011
1 of 19
DESCRIPTION
The DB1230 is a high frequency synchronous
rectified step-down regulator which integrates an
110m
Ω high-side power MOSFET and an 85m Ω
low-side power MOSFET.
It provides easy & compact solution to implement
3A continuous output current over a wide range
input from 4.5V to 16V with a good load and line
regulation.
The current-mode control operation provides a
good loop-stability under any system condition
and fast transient response.
According to an internal compensation and a high
frequency operation, the DB1230 requires a few
number of external components mentioned in the
basic dc-dc power system.
The built-in protections are allowed to have a
simple design and a robust operation.
For a good thermal performance, the DB1230
uses an internal temperature independent voltage
reference and the package that has low
θ
JA
(<50°C/W)
It is available in 8-pin SOP-EP or 14-pin TSSOP
package with an exposed pad.
FEATURES
„ 4.5V to 16V operating input range.
„ High-side 110 m Ω , low-side 85 m Ω
Built-in power MOSFETs.
„ Fixed PWM 700kHz switching frequency.
„ Output voltage accuracy : ± 2%
„ 3A continuous output current.
„ Low reference voltage : 0.8V
„ Programmable soft-start.
„ Internal Compensation.
„ Built-in SCP, OCP, TSD Protection.
„ Thermally Enhanced 8-SOP-EP Package
APPLICATIONS
„
Digital Set Top Boxes.
„
Personal Video Recorder.
„ Flat Panel TV & Monitor.
„ Distributed Power Systems.
ORDERING INFORMATION
PART NUMBER PACKAGE
DB1230HETR 8-SOP-EP
DB1230HPTR 14-TSSOP-EP
TYPICAL APPLICATION EFFICIENCY
Fig.1 Normal application circuit Fig.2 Efficiency (Vout=3.3V)
Harman Kardon AVR 171 Service Manual
Page 100 of 174