Harman Kardon AVR 171/230 Service Manual page 100

Harman Kardon
3A, 700KHz, Synchronous Step-down Converter
DESCRIPTION
The DB1230 is a high frequency synchronous
rectified step-down regulator which integrates an
110mΩ high-side power MOSFET and an 85mΩ
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
(<50°C/W)
It is available in 8-pin SOP-EP or 14-pin TSSOP
package with an exposed pad.
TYPICAL APPLICATION
Fig.1 Normal application circuit
FEATURES
4.5V to 16V operating input range.
High-side 110 mΩ, low-side 85 mΩ
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
JA
PART NUMBER
DB1230HETR
DB1230HPTR
EFFICIENCY
Fig.2 Efficiency (Vout=3.3V)
1 of 19 Preliminary Datasheet DB1230P-02
AVR 171 Service Manual
DB1230
PACKAGE
8-SOP-EP
14-TSSOP-EP
19. Oct. 2011
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